Journal articles on the topic 'Digital Signal Analyzer'
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Zubarev, Petr, Svetlana Ivanenko, Alina Ivanova, Andrey Kvashnin, Aleksandr Kotelnikov, Ekaterina Puryga, Aleksandr Khilchenko, and Vasiliy Shvyrev. "Digital Analyzer of Diamond Detector Signals for ITER Vertical Neutron Camera." Siberian Journal of Physics 9, no. 3 (October 1, 2014): 11–19. http://dx.doi.org/10.54362/1818-7919-2014-9-3-11-19.
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In this paper, digital analyzer of diamond detector signals of ITER Vertical Neutron Camera (ITER VNC) are described, which uses digital signal processing. Digital analyzer of pulse signals is based on ADC12500PXIe (two channels, 12 bit, 500 MHz, PXI Express), which satisfies the ITER VNC requirements. In this paper, the architecture of digital signal processing unit is given. Trapezoidal digital shaper for pile-up separation and energy spectrum unit are described. In addition, structure of digital analyzer software levels are considered
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Yue, Chenyang, Guoyuan Xu, Gangzheng Yue, Yanzhe Sun, and Zhiyu Mi. "Signal acquisition analyzer based on MSP432." Journal of Physics: Conference Series 2414, no. 1 (December 1, 2022): 012002. http://dx.doi.org/10.1088/1742-6596/2414/1/012002.
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Abstract The system is based on digital signal processing technology, takes MSP432P401R single-chip microcomputer as the main controller, uses the on-board ADC to convert the input signal into a digital signal, and then carries out FFT transformation to obtain the amplitude of each harmonic component, so as to carry out spectrum analysis and calculate THD/ THDo/ Δ values for further signal processing. The system realizes the signal processing and the calculation of distortion and distortion measurement error and expands the functions of calculating the normalized amplitude of the fundamental wave and harmonic and recovering the input signal waveform. Distortion measurement error value Δ ≤3%, can process signal amplitude range 30mV~600mV, fundamental frequency range 1kHz~100kHz, and the calculation and processing time is less than 10 seconds.
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Hou, Yonghong, Guihua Liu, Qing Wang, and Wei Xiang. "Performance Optimization of Digital Spectrum Analyzer With Gaussian Input Signal." IEEE Signal Processing Letters 20, no. 1 (January 2013): 31–34. http://dx.doi.org/10.1109/lsp.2012.2227255.
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Peterson, A. M., K. S. Chen, and I. R. Linscott. "The Multichannel Spectrum Analyzer." Symposium - International Astronomical Union 112 (1985): 373–83. http://dx.doi.org/10.1017/s0074180900146716.
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The MCSA is a special-purpose digital signal processor. Its main function is to filter a wide-band signal into many narrower bands, so that each of the output bands has a bandwidth that is a better match to the signal being searched for.The basic MCSA provides simultaneous output bandwidths of approximately 1 HZ, 32 Hz, 1024 Hz, and 74 kHz over a spectrum that is about 8 MHz wide. The input to the MCSA consists of a complex signal sampled at 10 MHz, and the outputs consist of either complex samples or power (square-law-detected) samples. In addition, the MCSA provides an accumulator for taking the integral of the power of the output bands for periods up to 1000 sec.The MCSA hardware is constructed using wire-wrap technology. The implementation of the hardware is done with the aid of a computer program developed specifically for the design of the MCSA. Care has been taken in the MCSA design to ensure that engineering tradeoffs do not adversely affect the performance of the system.
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Liu, Yang, Yong Tie, Shun Na, and Dong Li. "Correlation Analyzer Project for Teaching Digital Signal Processing with MATLAB and DSP Processor." Applied Mechanics and Materials 263-266 (December 2012): 139–42. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.139.
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Digital signal processing (DSP) has become one of key enabling technologies for communications, condition monitoring, multimedia computing, wireless networks and other areas requiring signal and information processing. With the rapid growth of applications of digital signal processing in the world, it has become necessary to introduce these concepts to graduates and undergraduates. Teaching of digital signal processing is carried out not only at the electrical and electronic engineering departments as the most traditional interested in this subject, but also others technical universities are carried out lectures and tutorials. In this paper, a digital signal processing development process is described. It starts from the conceptual algorithm design and computer simulation using MATLAB. After verification of the algorithm, a fixed-point C program is developed for a specific fixed-point DSP processor. This application covers most topics included in a DSP courses performing independent multiple simple experiments. The used methodology enables students and engineers to understand and develop complex fixed-point applications on hardware implementations.
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Fateeva, A. S., G. V. Nikonova, and I. E. Kashchenko. "Wideband Signal Analyzer Based on Time-Interleaved ADCs with Digital Calibration." Journal of Physics: Conference Series 1546 (May 2020): 012013. http://dx.doi.org/10.1088/1742-6596/1546/1/012013.
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Tan, Qiang, Cuimei Bo, Jun Li, Yiqing Wang, Xiaorong Wang, and Shubo Jiang. "Glucose Analyzer Based on Self-made Biosensor for High-performance Glucose Detection." MATEC Web of Conferences 327 (2020): 01003. http://dx.doi.org/10.1051/matecconf/202032701003.
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The concentration analyzer with high precision and wide range is the core device for monitoring the fermentation process. In this work, we designed and proposed a lowcost three-electrode glucose analyzer based on a self-made screen-printed enzyme biosensor chip, which has a Prussian blue (PB) nanocubic structure and leads to high sensitivity of 117.31 μAmM-1cm-2. The hardware design of the glucose analyzer can be divided into five critical parts, including digital, signal treatment system, power supply, motor-driven and the host computer. The signal treatment system is used to collect, convert and amplify the weak current signal generated by the biosensor. The digital circuit of the central processing unit of the analyzer is designed using the STM32F407ZET6. Besides, an external analog-to-digital converter is used to achieve high precision A/D conversion. The stability of the potentiostat is ensured by designing the precision power supply, hardware filtering, and algorithm filtering. The experimental results show that the glucose analyzer has a wide linear detection range from 1g/L to 120g/L and the coefficient of variation at 1g/L is 0.038, which exhibits excellent performance in stability and detection accuracy. The analyzer can be applied in the future for in-situ measurement of glucose concentration for its wide-range and high-precision detection capabilities.
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Фаустов, И. С., В. Б. Манелис, А. Б. Токарев, В. А. Козьмин, and В. А. Сладких. "ZIGBEE SIGNALS ANALYZER." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 4 (October 20, 2021): 65–70. http://dx.doi.org/10.36622/vstu.2021.17.4.009.
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Широкое распространение беспроводных технологий требует развития средств контроля за устройствами и сетями передачи данных и, в частности, за беспроводными персональными сетями стандарта ZigBee. Известные способы поиска и приема сигналов ZigBee, требующие осуществления предварительной оценки частотного рассогласования, обладают высокой вычислительной сложностью. Некогерентный способ приема сигналов ZigBee не требует больших вычислительных ресурсов, но не обеспечивает удовлетворительную помехоустойчивость. Целью работы являлась разработка комбинированного алгоритма обнаружения и приема сигналов ZigBee. На основе разработанного алгоритма построен анализатор, позволяющий идентифицировать персональные сети, их передающее и приемное устройства. Новизна: для приёма сигналов при неизвестной частотной расстройке используется сочетание когерентной обработки на коротких временных интервалах с их последующим некогерентным накоплением. Предложенный алгоритм способен эффективно работать в неблагоприятных условиях приема и обладает относительно невысокой вычислительной сложностью. Результат: использование представленного решения позволяет выполнять обнаружение и прием сигналов ZigBee радиодоступных источников, идентифицировать персональную сеть, передающее и приемное устройства в этой сети. Практическая значимость: предложенный алгоритм может использоваться для построения анализатора сигналов ZigBee на программно-определяемом радиоприемном устройстве с полосой одновременной обработки сигналов от 2 МГц. Реализованный в универсальных цифровых радиоприемных устройствах семейства АРГАМАК алгоритм применяется в системах поиска и локализации несанкционированных источников радиоизлучений в контролируемых объектах The widespread adoption of wireless technologies requires the development of controls over devices and data networks and in particular over ZigBee wireless personal networks. Known methods of searching for and receiving ZigBee signals, which require a preliminary assessment of frequency offset, have a high computational complexity. The non-coherent method of receiving ZigBee signals does not require large computing resources but does not provide satisfactory noise immunity. The purpose of the work was to develop a combined algorithm for detecting and receiving ZigBee signals. Based on the developed algorithm, we built an analyzer that allows you to identify personal networks, their transmitting and receiving devices. Novelty: to receive signals with an unknown frequency offset, we used a combination of coherent processing at short time intervals with their subsequent non coherent accumulation. The proposed algorithm is able to work effectively in unfavorable reception conditions and has a relatively low computational complexity. Result: the use of the presented solution allows you to detect and receive ZigBee signals from radio-accessible sources, identify a personal network, a transmitting and receiving device in this network Practical relevance: the proposed method can be used to build a ZigBee signal analyzer on an SDR with a band of simultaneous signal processing from 2 MHz. The ZigBee network analyzer, implemented on the basis of a digital radio receiver of the ARGAMAK family, serves as the basis for the device for searching and localizing unauthorized radio sources in controlled objects
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Zhang, Guoping, and Mande Xie. "Design and Implementation of Digital Signal Transmission Performance Analyzer Based on FPGA." Research Journal of Applied Sciences, Engineering and Technology ` 11, no. 9 (February 21, 2013): 1991–97. http://dx.doi.org/10.19026/rjaset.5.4740.
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Inagaki, Shigemi, Eizi Ezura, Masaaki Kobayashi, and Kimio Morimoto. "Nonlinear Gain for a Subnoise-level Signal in a Digital Spectrum Analyzer." Japanese Journal of Applied Physics 37, Part 1, No. 9A (September 15, 1998): 5076–77. http://dx.doi.org/10.1143/jjap.37.5076.
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Sansaloni, Trini, Asun Perez-Pascual, Vicente Torres, VicenÇ Almenar, JosÉ F. Toledo, and Javier Valls. "FFT Spectrum Analyzer Project for Teaching Digital Signal Processing With FPGA Devices." IEEE Transactions on Education 50, no. 3 (August 2007): 229–35. http://dx.doi.org/10.1109/te.2007.900025.
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Liu, Hai Jiang. "Manufacture of Online Analyzer of Water in Oil." Advanced Materials Research 694-697 (May 2013): 1267–70. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.1267.
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Hardware and software design of high-precision real-time analyzer of water in oil that focuses on AT89C52 SCM is introduced. ICL7135A / D conversion is applied to realize high-precision data acquisition in the analog signal acquisition channels, method of true and false load is adopted to inhibit the interference signal in data acquisition department and data transmission channel, and the stability of data is improved through the operation of software. Digital tube is applied to display the measured value, an alarm signal would be sent out if the value exceeds the set value, and at the same time the control signal of the start of oil-water separation equipment would be given. The analyzer is constituted by SCM, shortwave emitter, data processing section, result display and some other components, the system structure is simple and reliable, and the measuring accuracy is high.
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Wang, Kang, Zhi-Jiang Xu, Yi Gong, and Ke-Lin Du. "Mechanical Fault Prognosis through Spectral Analysis of Vibration Signals." Algorithms 15, no. 3 (March 15, 2022): 94. http://dx.doi.org/10.3390/a15030094.
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Vibration signal analysis is the most common technique used for mechanical vibration monitoring. By using vibration sensors, the fault prognosis of rotating machinery provides a way to detect possible machine damage at an early stage and prevent property losses by taking appropriate measures. We first propose a digital integrator in frequency domain by combining fast Fourier transform with digital filtering. The velocity and displacement signals are, respectively, obtained from an acceleration signal by means of two digital integrators. We then propose a fast method for the calculation of the envelope spectra and instantaneous frequency by using the spectral properties of the signals. Cepstrum is also introduced in order to detect the unidentifiable periodic signal in the power spectrum. Further, a fault prognosis algorithm is presented by exploiting these spectral analyses. Finally, we design and implement a visualized real-time vibration analyzer on a Raspberry Pi embedded system, where our fault prognosis algorithm is the core algorithm. The real-time signals of acceleration, velocity, displacement of vibration, as well as their corresponding spectra and statistics, are visualized. The developed fault prognosis system has been successfully deployed in a water company.
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Quy, Dang Hong Ngoc, Pham Ngoc Tuan, and Nguyen Nhi Dien. "Design and Construction of a Digital Multichannel Analyzer for HPGe Detector Using Digital Signal Processing Technique." Journal of Analytical Sciences, Methods and Instrumentation 09, no. 02 (2019): 22–29. http://dx.doi.org/10.4236/jasmi.2019.92003.
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Hashim, Wahidah, Marzuki Mimi Hazrinda Binti, and Andino Maseleno. "Arduino Code Global System for Mobile Communications for Signal Analyzer." Journal of Computational and Theoretical Nanoscience 17, no. 6 (June 1, 2020): 2781–87. http://dx.doi.org/10.1166/jctn.2020.8942.
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In these era, everything is on the finger. All application or system that have created or invented are purposely to easiest the user. Even though so many things were transformed into digital things or internet of things, but there is certain thing which still we did in a manual. The best example that we can see is recorded data. Many of us were still record data in the paper which the effect if we not save the paper properly, it may due to loss. So, data collector for signal analyzer is inventing to work as collector data automatically after performing the measuring signal analyzer then save the data to cloud as raw data. Raw data refer to any data object that hasn’t undergone thorough processing, either manually or through automated computer software. Because of that, user may use the raw data to make analysis completely and save it back. User also can get the data anytime when needed.
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Yeom, Kyung-Whan, and Jin-Seong Roh. "An Efficient Cross-Correlation Method for a Digital Phase Noise Measurement System." Journal of Electromagnetic Engineering and Science 22, no. 6 (November 30, 2022): 665–77. http://dx.doi.org/10.26866/jees.2022.6.r.136.
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In this paper, we propose a digital phase noise measurement using a 10-bit digital oscilloscope MXR608A from Keysight Technologies. The digital oscilloscope’s four channel data are used for digital phase noise measurement: two channels are assigned for the equally divided SUT (source under test), while the other two are assigned for the equally divided reference signals. First, we propose a cross correlation method to identify the phase noises added by the ADCs in the digital oscilloscope from the measured phase noises. Then, we propose a novel cross correlation method to extract the SUT phase noise. The cross-correlation output of the proposed method yields only the SUT phase noise and does not contain the reference signal phase noise unlike the traditional method. The proposed method was applied to measure the phase noises of the two SUTs, Keysight’s synthesized signal generator E8257D and function generator 33600A. The measured phase noises of the two SUTs were compared and found to show remarkable agreements with those measured using Keysight’s signal source analyzer E5052B. The phase noise floor of our digital phase noise measurement system is about -160 dBc/Hz.
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Novkovic, Dusan, Laslo Nadjdjerdj, Aleksandar Kandic, Ivana Vukanac, and Mirjana Djurasevic. "Experimental testing of the digital multichannel analyzer for gamma spectrometry measurements." Nuclear Technology and Radiation Protection 23, no. 1 (2008): 43–46. http://dx.doi.org/10.2298/ntrp0801043n.
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The results of experimental testing of the digital multichannel analyzer which digitalizes the signal after a preamplifier are presented. The recordings of some of the characteristics of the spectrometer containing a digital MCA, such as full-peak efficiency, net area ratio of the two peaks and the stability of the peak position, were carried out under different input counting rates, with different radioactive sources. The tested MCA has shown some excellent features, like the stability of the peak position over a long-term period and flexibility in the adjusting of optimum measurement conditions. However, the performed tests have also shown some serious and unexpected disadvantages of the digital MCA when it operates under certain circumstances, one of them having to do with the automatic tuning of live-time correction at low-input counting rates.
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Putra A, I. Nengah, Nuri Nur Cahyono, Gesit Pratiknyo, and M. Sigit Purwanto. "DESIGN OF DETECTING ACOUSTIC WAVES AT THE EXERCISE SMART MINE USING ACOUSTIC SENSOR." JOURNAL ASRO 11, no. 2 (April 20, 2020): 64. http://dx.doi.org/10.37875/asro.v11i2.270.
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The Indonesian Navy is a unit of defense of the Republic of Indonesia (NKRI). Sea mines are explosive devices placed in waters to destroy ships. Acoustics is a branch of physics that deals with all mechanical waves in liquids, gases and solids, such as vibration, sound and ultrasonic. Arduino has made microcontroller technology more accessible and easier for even novice users. Because of this, there are special functions in audio or acoustic processing techniques aimed at using Arduino. The application of acoustic signals in the military field of the Navy, in the identification of vessels caught by the microphone receiver. The movement of objects that are caught by the microphone will be analyzed to conclude the object. From the results of the sound characteristics raised by the object, it will give a different picture for different variations of the object. Processing acoustic signals using DSP will make it easier to infer the captured acoustic signal. The circuit board used is a microphone signal amplifier and signal conditioner, for processing the audio signal obtained from the microphone and to produce output data which is the result of the process using Arduino. Analog-to-digital converter (ADC) of the microcontroller works in the voltage range from 0.0 V to +3.3 V or +5.0 V. Toachieve good sampling results, that the signal peak is close to the maximum value of the ADC. Additionally, voltage amplitudes above this threshold can damage the controller input port or produce unwanted harmonics. Therefore, a signal pre-amp circuit is needed to guarantee the appropriate audio sample signal as well as to protect the system. The test results obtained from the system analyzer frequency and signal meters can be used to identify acoustic signals.
Keyword: Singnal Acoustic/michophone, controller, Arduino Uno, pre-amp frequency analyzer
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Zhou, Li Qing, Da Xu, Shuang Hu, and Peng Xu. "A New Portable Harmonic Analyzer Based on MSP430." Advanced Materials Research 971-973 (June 2014): 1059–63. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1059.
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In this paper, a new portable digital instrument is developed to measure the frequency, rms voltage, rms current and harmonic of power grid. Three phase voltage and current are sensed with precise transformer and then processed by signal conditioning unit before sampling. Synchronous AC sampling technique is introduced to avoid leakage effect of FFT. Consequently, frequency estimation, rms measurement and harmonic estimation are achieved based on MSP430. The experiment results indicate that this analyzer provides accurate frequency estimates with error in the range of 0.001Hz and amplitude estimates with error in the range of 0.1%, which can meet the need of offline application.
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Li, Shan Shan, and Jian Zhou. "Study on Test of DMB-T Signal Based on Software Defined Radio Technique." Applied Mechanics and Materials 303-306 (February 2013): 835–38. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.835.
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With the release of the standard, digital television terrestrial broadcasting is being gradually extended in many places. In order to speed up the extension and the application, also to evaluate the existing digital television terrestrial broadcasting system, we need a easy-to-use signal analysis and measurement system. The traditional signal measurement method is through the special hardware circuit to realize, but that method is high cost, and the system structure is complex and single function. To improve the flexibility of the system , we realize the system based on virtual instrument technology. In hardware section, this thesis described the block diagram of the system and the introduction of the NI vector signal analyzer. In software part, this thesis described the overall test system based on LabVIEW and the realization of the system features multi-threading, each step of synchronization signals achieved. The image Fig. 3 and Fig. 4 show the result of this system test software system.
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Cai, Lin. "The Design of Power Harmonic Analyzer Based on UC/OS-II." Advanced Materials Research 1055 (November 2014): 118–21. http://dx.doi.org/10.4028/www.scientific.net/amr.1055.118.
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In this paper, we discuss the applications of UC/OS-II and DSP(digital signal processor) in area of harmonic analyzing. In this research, the FFT algorithm is employed, and the realization of FFT on DSP is discussed. The whole system is based on UC/OS-II operation system, which coordinate all the tasks about the system. The system based on DSP+ARM and UC/OS-II improve the reliability and real time quality. The hardware design and software design are proposed in this paper, with flow chart and part of routine codes shown.
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Chen, Guang Jun, Bing Bing Yan, Hai Yan Chen, and Wei Guo. "Design of the Comprehensive Experimental Platform for Testing Technology Based on Virtual Instrument." Applied Mechanics and Materials 151 (January 2012): 646–50. http://dx.doi.org/10.4028/www.scientific.net/amm.151.646.
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Virtual Instrument Technology represents the future direction of development of the instrument. At present, it is very popular that Virtual instrument is applied to test technology experiment in developed countries. The virtual integrated experimental platform of testing technology was designed based on the LabVIEW software, including signal generator, signal superimposed meter, digital filters, signal spectrum analyzer, noise signal detection and analysis system. The comprehensive experimental platform can replace the traditional equipment and can easily extend its functionality. It can provide students with a virtual integrated experimental platform.
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Luo, Xiao Qing, Rong Hu, and Bing Hui Zheng. "An Improved Method Based on FPGA and DSP for Designing FBG Sensor Analyzer." Advanced Materials Research 760-762 (September 2013): 70–75. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.70.
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Fiber Bragg sensors become research focus of sensing technology, and have been widely used in many applications. This paper proposed a novel Fiber Bragg Grating sensor analyzer based on FPGA (Field Programmable Gate Array) and DSP (Digital Signal Processor) platform, which converted external parameter changes into wavelength shift in fiber Bragg gratings. The system can measure real-time temperature, strain, pressure, displacement and others through key steps including data acquisition, clutter Filtering, signal peak detection, Gaussian curve fitting and weighted wavelength calculation to carry out wavelength demodulation. Moreover, it is able to achieve fault diagnosis and positioning of the fiber link. Experimental results show that the system has advantages of low power consumption, good linearity, strong robustness, high precision and resolution on wavelength demodulation. And the system is still stable and reliable after a long test under different conditions.
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Wang, Ping, Gui Zhi Xu, Lei Wang, and Cheng Long Liu. "The Design of an Intelligent EEG Monitoring and Control System." Applied Mechanics and Materials 598 (July 2014): 583–86. http://dx.doi.org/10.4028/www.scientific.net/amm.598.583.
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The core device of our system is a handheld EEG monitoring analyzer, which is based on a new DSP (Digital Signal Processor) control system. The DSP is based on a Think-Gear module and collects the EEG signals reliably. The system only uses a dry electrode, which ensures that the user can have a happy experience in daily life. Our main purpose is that we can provide a hardware prototype with the application of BCI (Brain-Computer Interface).The system can monitor the sleep process accurately and distinguish the eyes open or closed state, sleep state and the degree of relaxation.
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Samila, Andriy, Oleksandra Hotra, and Jacek Majewski. "Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA." Sensors 21, no. 18 (September 9, 2021): 6029. http://dx.doi.org/10.3390/s21186029.
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This paper presents a method for implementing the configuration structure of an integrated computational core of a pulsed nuclear quadrupole resonance (NQR) sensor based on a field-programmable gate array (FPGA), which comprises the following modules: a three-channel direct digital synthesizer (DDS), a pulse sequence shaper and a software-defined radio. Experimental studies carried out using the in-circuit analyzer SignalTap Logic Analyzer have confirmed the reliability of the correct and stable operation of the functional modules of the configuration structure at all stages of signal transformations, starting from the formation of the envelope of the excitation pulses and ending with the obtainment of low-frequency quadrature signals at the outlet of the compensating filters. The time and frequency dependences of the amplitude of the output signals generated using the DDS based on a 48 bit phase accumulator are investigated. This development can be used when creating pulsed coherent NQR sensors in the frequency range of 1 MHz–50 MHz.
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Vinnik, Alexander, Tetiana Komisova, and Roman Kratenko. "MEANS OF DIGITAL PROCESSING AND GENERATION OF SOUND AND ULTRASOUND FREQUENCY SIGNALS IN TEACHING AND RESEARCH WORK." OPEN EDUCATIONAL E-ENVIRONMENT OF MODERN UNIVERSITY, no. 13 (2022): 1–18. http://dx.doi.org/10.28925/2414-0325.2022.131.
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The authors analyse the most common free and shareware software for analysis and generation of sound signals, which is based on the use of ADC (analogue-to-digital converter) and DAC (digital-to-analogue converter) of a computer sound card. With the accordance to the present paper, there is practically no domestic Ukrainian-language software for working with ADC and DAC sound cards. The authors propose to use affordable personal mobile cardiographs, both for the study of biopotentials and the processing of other low-frequency signals. The staff of Chemistry Department of G.S. Skovoroda KhNPU has been developing a software and methodological complex of SchoolKit, one of the applications of which is called SoundCardScientificKit. It includes an audio signal analyzer, a special shape signal generator, and a frequency spectrometer. This software is universal and widely used. Therefore, it can be used both in research, and to demonstrate physical phenomena associated with sound or electrical oscillations of low frequency from 20 to 20,000 Hz. The main functions and interface of the SoundCardScientificKit software are described. The authors conducted testing the special form signal generator of the SoundCardScientificKit application with Realteck High Definition Audio sound card. The results showed the reproduction of the programmed frequency to be occuring with high accuracy. The principle circuits of potential amplifiers used in the development of electrocardiographs, myographs, etc., were analyzed. A simple circuit of the biopotential amplifier based on three TL082 chips has been developed, which includes a high-efficiency noise filter with a frequency of 50 Hz. The paper shows this amplifier to have been used to obtain an ECG (electrocardiogram). Particular attention is paid to the environmental aspects of the creative activity of students. The authors suggest that, when developing electronic devices, if possible, one can use the equipment that requires disposal. Reusing unusable equipment not only removes the problems associated with processing, but also allows students to learn about the principles of operation and design features.
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Barros, Everaldo de, Carlos d'Andrade Souto, Leandro Ribeiro de Camargo, and Mauro Hugo Mathias. "Application of a computer sound card for measurement of mechanical vibrations." Revista Brasileira de Ensino de Física 37, no. 4 (December 2015): 4313–1. http://dx.doi.org/10.1590/s1806-11173742036.
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This paper presents a data acquisition and analysis system based on a computer sound card for measuring and processing random vibration signals. This system turns the computer into a two-channel measurement instrument which provides sample rate, simultaneous sampling, frequency range, filters and others essential capabilities required to perform random vibrations measurements. An easy-to-use software was developed for vibration monitoring and analysis, including facilities for data recording, digital signal processing and real time spectrum analyzer. Since the tasks of vibration data acquisition frequently require expensive hardware and software, this versatile system provides students a very accurate and inexpensive solution for experimental studying mechanical vibrations.
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Tao, Ling, Wei Long, and Yan Qing Wang. "Design and Implementation of the Control System for an ARM9-Based Biochemical Analyzer." Advanced Materials Research 268-270 (July 2011): 454–57. http://dx.doi.org/10.4028/www.scientific.net/amr.268-270.454.
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The design and implementation of the control system of an ARM9-based biochemical analyzer was introduced in detail. The S3C2440, an ARM9-based MCU, was the core of the control system. Precision regulator circuit of light of the analyzer was designed to stabilize the voltage supply of the light source. Closed-loop motor positioning control technology and freely programmable CPLD stepper motor sub-circuit technology were used to precisely position the grating. And flexible gain control technology based on digital potentiometers was employed to solve the problem of signal regulation. Such core technical problems was solved in succession, it thereby improves the instrument's performance and function and provides a number of inexpensive high-quality products for domestic small and medium sized hospitals especially rural hospitals and promoted the establishment of those hospitals in consequence.
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Ayesha, Areeba, MuhibUr Rahman, Amir Haider, and Shabbir Majeed Chaudhry. "On Self-Interference Cancellation and Non-Idealities Suppression in Full-Duplex Radio Transceivers." Mathematics 9, no. 12 (June 20, 2021): 1434. http://dx.doi.org/10.3390/math9121434.
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One of the major impediments in the design and operation of a full-duplex radio transceiver is the presence of self-interference (SI), that is, the transceiver’s transmitted signal, 60–100 dB stronger than the desired signal of interest. To reduce the SI signal below the receiver’s sensitivity before coupling it to the receiver, radio frequency (RF)/analog domain cancellation is carried out. Even after SI cancellation to the required level in the analog domain, the residual SI signal still exits and lowers the transceiver’s performance. For residual SI cancellation, a digital domain cancellation is carried out. RF impairments are the major obstacle in the residual SI cancellation path in the digital domain. Linearization of RF impairments such as IQ mixer imbalance in the transmitter and receiver chain, non-linear PA with memory, and non-linear LNA are also carried out. Performance evaluation of the proposed techniques is carried out based on SINR, the power of different SI signal components, PSD, output to input relationship, SNR vs. BER, spectrum analyzer, constellation diagram, and link budget analysis. The proposed techniques provide attractive RF/analog SI cancellation of up to 80–90 dB, digital residual SI cancellation of up to 35 to 40 dB, total SI cancellation of up to 110 to 130 dB, and an SINR improvement of up to 50 dB.
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Hoja, Jerzy, and Grzegorz Lentka. "A Family of New Generation Miniaturized Impedance Analyzers for Technical Object Diagnostics." Metrology and Measurement Systems 20, no. 1 (March 1, 2013): 43–52. http://dx.doi.org/10.2478/mms-2013-0004.
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Abstract The paper presents the family of three analyzers allowing to measure impedance in the range of 10 Ω<|Zx|<10 GΩ in a wide frequency range from 10 mHz up to 100 kHz. The most important features of the analyzer family are: miniaturization, low power consumption, low production cost, telemetric controlling and the use of an impedance measurement method based on digital signal processing (DSP). The miniaturization and other above-mentioned features of the analyzers were obtained thanks to the use of the newest generation of large-scale integration chips: e.g. “system on a chip” microsystems (AD5933), 32-bit AVR32-family microcontrollers and specialized modules for wireless communication using the ZigBee standard. When comparing metrological parameters, the developed instrumentation can equal portable analyzers offered by top worldwide manufacturers (Gamry, Ivium) but outperforms them on smaller dimensions, weight, a few times lower price and the possibility to work in a distributed telemetric network. All analyzer versions are able to be put into medium-volume production.
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Tao, Xiao. "Design and Research of Optical Fiber Signal Analyzer in Embedded System Based on Big Data." Journal of Physics: Conference Series 2066, no. 1 (November 1, 2021): 012055. http://dx.doi.org/10.1088/1742-6596/2066/1/012055.
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Abstract With the advent of the era of big data, substation automation technology has reached a certain level after more than ten years of application development. In recent years, in the transformation and construction of the transmission and distribution network, a large number of substations have adopted modern technology, which has greatly improved the technological modernization of transmission and distribution and transformer construction, enhanced the reliability of transmission and distribution and transformer scheduling, and reduced the substation. The total cost of construction and the application of electronic transformers have effectively promoted the research on digital substations. In order to complete the real-time monitoring and testing of the substation system, so as to more quickly grasp the working status of the substation equipment, this paper proposes a research and design of an optical fiber signal analyzer for substation system testing. By analyzing the IEC 61850 protocol, the characteristics of the embedded system and the embedded operating system, the software modular design of the sampling value module of the signal analyzer is carried out, and the analysis of the substation configuration file SCD is designed and realized. The research results show that in practical applications, it is necessary to parse the CID files one by one, which will cause cumbersome work and easy omissions. Based on the above considerations, the SCD configuration file containing the entire site information was finally selected.
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Markovic, Tomislav, Song Liu, Ilja Ocket, and Bart K. J. C. Nauwelaers. "A 20 GHz microwave heater for digital microfluidic." International Journal of Microwave and Wireless Technologies 9, no. 8 (June 5, 2017): 1591–96. http://dx.doi.org/10.1017/s1759078717000563.
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This paper reports on a microwave heater at 20 GHz for digital microfluidics. It allows rapid heating of nanoliter fluid samples and simultaneous temperature monitoring by correlating the reflection coefficient of the heater with the temperature dependency of the relative permittivity of the lossy fluid under consideration, in this case demineralized water. Microwave heating was performed with power levels of 20 and 23 dBm at the on-wafer probe tips on samples of 500 nL. Temperature measurements were carried out with a miniaturized type K thermocouple, and a platinum resistor to monitor the reference temperature. Microwave and thermal performances have been characterized using multi-physics software, and measurements obtained with a large signal vector network analyzer showed good agreement with simulated data. An average heating rate of 20 °C/s was observed during the first 4 s of the heating process.
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Niu, Wen Liang, Wen Zheng Li, and Kai Shuang Yin. "Application of DFG Model on SOPC Technology." Applied Mechanics and Materials 198-199 (September 2012): 696–700. http://dx.doi.org/10.4028/www.scientific.net/amm.198-199.696.
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HW/SW (hardware/software) co-design method based on analysis and optimization of DFG (data flow graphic) model is introduced for SOPC (System on a Programmable Chip) used for digital instrument design in this paper. The method is based on the DFG model of the digital signal process algorithm and implemented with SOPC technology. The DFG model could help designer to divide the function into hardware and software respectively, therefore, the optimizing analysis at system level and circuit level of a SOPC used for portable logic analyzer shows that the DFG model is very useful for not only optimizing architecture and power consumption, but also HW/SW co-design.
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Christenson, K. K. "Noise reduction in digitized images." Proceedings, annual meeting, Electron Microscopy Society of America 44 (August 1986): 878–79. http://dx.doi.org/10.1017/s042482010014573x.
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In order to produce useable images at high scan rates, the detectors on modern electron microscopes often have a very high bandwidth (short response time to signal changes). This bandwidth makes the signal noisey; the signal has large fluctuations about the mean. Because the film integrates the signal this noise is not a problem when photographing an image. But it causes an annoying blurring of the trace In slow y-modulated line scans and can result in large errors if the signal if measured with a fast analog to digital converter (ADC).We interfaced an EDAX 9100/70 x-ray analyzer with a PV9242 line scan/mapping option to a Philips EM420 STEM. The EDAX unit controls the x-y raster and digitizes the detector signal at each pixel. When reading the raw signal from the standard Philips SED detector and amplifier the images were very noisy. This is because the ADC actually samples the signal for a very small portion of the total conversion time and then holds the sampled value for the actual conversion, effectively reading the signal for 0.3 usee out of 170 usec.
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Dadić, Martin, Bruno Sandrić, Petar Mostarac, and Roman Malarić. "A Resistive Voltage Divider for Power Measurements." Journal of Energy - Energija 69, no. 1 (February 18, 2020): 3–6. http://dx.doi.org/10.37798/202069132.
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The paper presents a resistive voltage divider (RVD), developed for power measurements at much higher frequencies than the traditional 50 Hz. The design of the RVD and the methods of its evaluation are described. The RVD is intended to be used in a digital sampling wattmeter application based on National Instruments PXI-4461 Dynamic Signal Analyzer. The design of the divider includes individual copper guards for each resistor, driven by the auxiliary chain of resistors. To reduce the leakage currents, the PTFE terminals are applied between pins of the resistors and the printed circuit board.
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Rutkowski, Igor, and Krzysztof Czuba. "Estimation of Phase Noise Transfer Function." Energies 14, no. 24 (December 7, 2021): 8234. http://dx.doi.org/10.3390/en14248234.
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Quantifying frequency converters’ residual phase noise is essential in various applications, including radar systems, high-speed digital communication, or particle accelerators. Multi-input signal source analyzers can perform such measurements out of the box, but the high cost limits their accessibility. Based on an analysis of phase noise transmission theory and the capabilities of popular instrumentation, we propose a technique extending the functionality of single-input devices. The method supplements absolute noise measurements with estimates of the phase noise transfer function (also called the jitter transfer function), allowing the calculation of residual noise. The details of the hardware setup used for the method verification are presented. The injection of single-tone and pseudo-random modulations to the test signal is examined. Optional employment of a spectrum analyzer can reduce the time and number of data needed for characterization. A wideband synthesizer with an integrated voltage-controlled oscillator was investigated using the method. The estimated transfer function matches a white-box model based on synthesizer’s structure and values of loop components. The first results confirm the validity of the proposed technique.
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Ruo Roch, Massimo, and Maurizio Martina. "VirtLAB: A Low-Cost Platform for Electronics Lab Experiments." Sensors 22, no. 13 (June 27, 2022): 4840. http://dx.doi.org/10.3390/s22134840.
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The recent SARS-CoV2 pandemic has put a great challenge on university courses. Electronics teaching requires real laboratory experiences for students, which cannot be realized if access to physical infrastructures is prohibited. A possible solution would be to distribute to students, at home, electronics equipment suitable for laboratory experiments, but no reasonable product is currently available off-the-shelf. In this paper, the design and development of a very-low-cost experimental board tailored to these needs is presented. It contains both programmable prototyping circuitry based on a microcontroller and an FPGA and a set of measurement instruments, similar to the ones found on a typical lab desk, such as a digital storage oscilloscope, multimeter, analog signal generator, logic state analyzer and digital pattern generator. A first board, suitable for analog and digital electronics experiments, has been designed and manufactured, and is described in this paper. The board has been successfully used in master’s degrees and PhD courses.
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Muszyńska, Magdalena, Dariusz Szybicki, Piotr Gierlak, Krzysztof Kurc, and Andrzej Burghardt. "The Use of VR to Analyze the Profitability of the Construction of a Robotized Station." Advances in Manufacturing Science and Technology 44, no. 1 (April 28, 2020): 32–37. http://dx.doi.org/10.2478/amst-2019-0005.
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AbstractThe development of software applications and the use of VR (Virtual Reality) techniques allow to improve the company’s financial result. The construction of models of robotic stations with robots using Virtual Robot technology allows to determine the time of the machining process. It allows its optimization through the selection of accelerations, tools, tooling strategies, and so on. Determining the time of a technological operation translates into savings. This allows you to decide on the purposefulness of the investment. In addition, modern software add-ons, for example, Signal Analyzer in RobotStudio, allow you to monitor the electricity consumption of a robotic station. The article presents a solution showing how, based on the construction of digital models and the use of VR, we can conclude about the profitability of the investment.
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UJ Ekah, AO Adeniran, and OE Shogo. "Spatial distribution of frequency modulated signals in Uyo, Nigeria." World Journal of Advanced Engineering Technology and Sciences 5, no. 1 (January 30, 2022): 039–46. http://dx.doi.org/10.30574/wjaets.2022.5.1.0027.
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The kernel of this study is to x-ray the extent of radio coverage of two Frequency Modulated (FM) radio stations (AKBC 90.5MHz and Passion FM 94.5MHz), both located in Uyo, Nigeria. Measurement of signal strengths were carried out across 14 locations using a digital spectrum analyzer. A GPS app was used to take measurements of distance, elevation, longitude and latitude. The collected data was analyzed in the form of scattered plot, contour plots, bar charts, graphs and correlation analysis. For AKBC, good reception was received by users at locations N, C, L, and F. For Passion FM, excellent reception was obtained at locations N, F, A and B. For both stations under investigation, location N had the best reception while location E had poor reception. To establish the effects of Line of Sight (LOS) distance on signal strength, correlation values of – 0.84 and - 0.67 were obtained for AKBC and Passion FM. For signal strength against elevation, 0.71 and 0.55 were the correlation values obtained for AKBC and Passion FM. This shows that an increase in distance from the transmitting antenna led to a decrease in reception while an increase in elevation led to an increase in reception. Existing and intending radio stations in Uyo, are advised to increase the height of their transmitter and transmitting power for better reception and coverage.
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Li and Bhethanabotla. "Design of a Portable Orthogonal Surface Acoustic Wave Sensor System for Simultaneous Sensing and Removal of Nonspecifically Bound Proteins." Sensors 19, no. 18 (September 8, 2019): 3876. http://dx.doi.org/10.3390/s19183876.
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One challenge for current surface acoustic wave (SAW) biosensors is reducing nonspecific adsorption. A device propagating Rayleigh and shear horizontal surface acoustic waves in orthogonal directions fabricated in ST quartz has the capability of achieving simultaneous detection and nonspecific binding (NSB) protein removal. Current measurement methods for a SAW sensor system based on this device require large-size and expensive equipment such as a vector network analyzer (VNA), signal generator, and frequency counter, which are not suitable for portable, especially point-of-care, applications. In this work, a portable platform based on a direct digital synthesizer (DDS) is investigated for the orthogonal SAW sensor, integrating signal synthesis, gain control, phase/amplitude measurement, and data processing in a small, portable electronic system. This prototype was verified for both stability and repeatability, and the results matched very well with VNA measurements. Finally, system performance in real-time sensing and NSB removal was evaluated.
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Maslov, Oleh V., and Volodymyr V. Osadchyy. "SOFTWARE AT MOBILE SPECTROMETER WITH CZT-DETECTOR." Applied Aspects of Information Technology 4, no. 1 (April 10, 2021): 100–110. http://dx.doi.org/10.15276/aait.01.2021.9.
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The technology is based on a semiconductor CdZnTe-portable (almost the size of a mobile phone) gamma-ray spectrometer with high resolution, which provides high efficiency of rapid identification of radionuclides and assessment of radiation dose from low to moderately high levels. The CdZnTe gamma-ray spectrometer is a highly efficient device based on the use of CdZnTe (CZT) semiconductor detectors operating at room temperature with very low power consumption, a digital multichannel analyzer, and a microcomputer. CdZnTe-portable spectrometer is a self-contained device and consists of three modules - a detector module, a multichannel analyzer, and a microcomputer. The detector module contains a high-quality CdZnTe detector, a preamplifier, and a high voltage power supply for the detector. There are detector modules with different volumes of the CZT detector from 5 mm3 to 1600 mm3. It is possible to use a multi-detector system. The analyzer module contains an amplifier, a digital signal processor, a low voltage power supply, and a computer interface. The microcomputer software interacts with the multichannel analyzer, analyzes gamma spectra, and provides the accumulation of time profiles of the dose of gamma radiation, communication with other information systems. Spectrometric measurements in real-time make it possible to use "electronic collimation" technologies to build a map of the radiation field and localize sources of ionizing radiation, with the subsequent certification of identified sources, creation of an effective radiation monitoring system with the functions of certification of ionizing sources radiation. The corresponding software allows you to solve the following tasks – building a three-dimensional map of the fields of ionizing radiation of various degrees of spatial detailing, taking into account the radiation energy, localization, and certification of gamma radiation sources. The special laboratory kit is based on μSPEC microspectrometers. A LattePanda single board computer is used to control the operation of spectrometers, collect and analyze data. LattePanda – A Windows 10 Computer with integrated Arduino. This explains the choice of LattePanda. Windows 10 application allows you to use the WinSPEC software to control the multichannel analyzer operation supplied with the spectrometer. The built-in Arduino allows you to remote control the movement of the radiation source during laboratory experiment. Both the traditional problems of calibrating spectrometers (energy calibration and efficiency curves), including those for various source geometries, processing the measured spectra using standard programs, calculating the activity of sources, and the problem of creating a spectra processing program and a spectrometer control program are considered. The values of the minimum detectable activity are given.
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Marufuzzaman, Mohammad, Mamun Bin Ibne Reaz, Labonnah Farzana Rahman, and Tae Gyu Chang. "High-Speed CurrentdqPI Controller for Vector Controlled PMSM Drive." Scientific World Journal 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/709635.
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High-speed current controller for vector controlled permanent magnet synchronous motor (PMSM) is presented. The controller is developed based on modular design for faster calculation and uses fixed-point proportional-integral (PI) method for improved accuracy. Currentdqcontroller is usually implemented in digital signal processor (DSP) based computer. However, DSP based solutions are reaching their physical limits, which are few microseconds. Besides, digital solutions suffer from high implementation cost. In this research, the overall controller is realizing in field programmable gate array (FPGA). FPGA implementation of the overall controlling algorithm will certainly trim down the execution time significantly to guarantee the steadiness of the motor. Agilent 16821A Logic Analyzer is employed to validate the result of the implemented design in FPGA. Experimental results indicate that the proposed currentdqPI controller needs only 50 ns of execution time in 40 MHz clock, which is the lowest computational cycle for the era.
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Zhang, Qi, Lu Dai, and Xiong Chen. "Acid Emission Automatic Real-Time Sampling Monitoring System." Applied Mechanics and Materials 602-605 (August 2014): 1646–49. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.1646.
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This paper introduces a novel on-line real-time monitoring system for acidic emission produced by acid pickling, which has been one of the greatest contaminant and major harness content. The system can monitor the HCL concentration in exhaust fumes on-line, and realize the real-time analysis and transmission of the acquisition data. HCL wet chemical sampling system form the whole on-line monitoring system. HCL wet chemical sampling system consists of integrated air velocity transducer, chloride ion analyzer, wet chemical sampling device and liquid level measurement device. It aims to collect HCL fog sample and convert the sampling analogue signal to digital data that can be analyzed. The system overcomes the influence by high temperature, high humidity and high concentration of dust. It realizes the monitoring, storage, analysis, warning and transmission of HCL concentration data in the exhaust. It is beneficial in practical industrial field and environmental protection.
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Leblanc, Jean L., and Christophe de la Chapelle. "Characterizing Gum Elastomers by Fourier Transform Rheometry." Rubber Chemistry and Technology 76, no. 4 (September 1, 2003): 979–1000. http://dx.doi.org/10.5254/1.3547786.
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Abstract Fourier transform (FT) rheometry is an emerging new technique that allows the linear and non-linear viscoelastic behavior of polymer materials to be accurately investigated. Basically samples are submitted to torsional harmonic strain at fixed frequency and temperature in order to capture strain and torque signals. A commercial instrument, i.e. the Rubber Process Analyzer RPA 2000® (Alpha Technologies), was suitably modified, essentially in using a fast electronic analogic-digital conversion card to record and treat torque and strain signals using purposely written software. Details of such modifications were previously published and the work presented is a sequel of this development. The quality of the applied strain is first precisely documented through FT and found excellent, particularly in the high strain range. Three gum EPDM with different macromolecular characteristics (MWD and long chain branching) were analyzed either using standard dynamic testing, i.e. essentially in the linear viscoelastic range, or using the Fourier transform rheometry approach, by considering data gathered in the far non-linear viscoelastic range. Data obtained are considered with respect to know features of the samples. A series of SBR 1500 samples, collected from various manufacturers, were first analyzed using standard methods; as expected very small differences were seen. Then FT was used to consider torque signals at very high strain (up to 400% at 1 Hz). Using a simple 4-parameter model to treat the variation upon increasing strain of the relative third harmonic component of the torque signal, differences are clearly detected that are discussed with respect to available polymer manufacturing information.
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Chung, Rih-Lung, Chen-Wei Chen, Chiung-An Chen, Patricia Angela R. Abu, and Shih-Lun Chen. "VLSI Implementation of a Cost-Efficient Loeffler DCT Algorithm with Recursive CORDIC for DCT-Based Encoder." Electronics 10, no. 7 (April 5, 2021): 862. http://dx.doi.org/10.3390/electronics10070862.
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This paper presents a low-cost and high-quality, hardware-oriented, two-dimensional discrete cosine transform (2-D DCT) signal analyzer for image and video encoders. In order to reduce memory requirement and improve image quality, a novel Loeffler DCT based on a coordinate rotation digital computer (CORDIC) technique is proposed. In addition, the proposed algorithm is realized by a recursive CORDIC architecture instead of an unfolded CORDIC architecture with approximated scale factors. In the proposed design, a fully pipelined architecture is developed to efficiently increase operating frequency and throughput, and scale factors are implemented by using four hardware-sharing machines for complexity reduction. Thus, the computational complexity can be decreased significantly with only 0.01 dB loss deviated from the optimal image quality of the Loeffler DCT. Experimental results show that the proposed 2-D DCT spectral analyzer not only achieved a superior average peak signal–noise ratio (PSNR) compared to the previous CORDIC-DCT algorithms but also designed cost-efficient architecture for very large scale integration (VLSI) implementation. The proposed design was realized using a UMC 0.18-μm CMOS process with a synthesized gate count of 8.04 k and core area of 75,100 μm2. Its operating frequency was 100 MHz and power consumption was 4.17 mW. Moreover, this work had at least a 64.1% gate count reduction and saved at least 22.5% in power consumption compared to previous designs.
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MacArthur, A. "Geophone frequency calibration and laser verification." GEOPHYSICS 50, no. 1 (January 1985): 49–55. http://dx.doi.org/10.1190/1.1441835.
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A geophone frequency calibration procedure has been developed that provides both amplitude and phase information over a selectable frequency range with a single measurement. It is easy to perform in either a field or laboratory environment using a two‐channel analog input spectrum analyzer, and an inexpensive, easily constructed, shaker table. A second calibration procedure that uses laser interferometry was also developed and implemented to verify the first, more practical method. Agreement between the two procedures is within the uncertainty limits of the test equipment at all frequencies including those near and at physical resonance. Some concepts of digital signal processing were reviewed that affect the interpretation of both calibration and seismic test data.
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Gubsky, Dmitry, Yevgeniya Daineko, Madina Ipalakova, Anatoly Kleschenkov, and Dana Tsoy. "Computer model of a spectrum analyzer for a virtual laboratory: development and introduction to the educational process." PeerJ Computer Science 8 (November 3, 2022): e1130. http://dx.doi.org/10.7717/peerj-cs.1130.
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The worldwide COVID-19 pandemic has changed the development plans of every country. Instead, governments had to constantly deal with ever-emerging issues in healthcare, education, economics and industry. As a result, there has been an accelerated introduction of digitalization in these spheres. Thus, an increasing number of people have started using electronic services that have improved their digital literacy. This feature has had a positive impact on society and helped to create new interaction tools between populations and governments, students and institutions, customers and companies. The article aims to analyze how studying radio electronics can be improved by involving new tools and how they can be applied in distance learning. This work presents the results of the development and application of a virtual radio signal simulation in the educational process in the form of a laboratory practicum. Working on this approach required specific research in the field; the foreign experience was observed and studied. The review allowed us to find out how digitalization and the application of digital tools affect the behaviour, cognition, and overall performance of students during the pandemic. The authors conducted a questionnaire among students to evaluate the features of the virtual laboratory work and their effect on the educational process. The results analyzed are given in the article. They showed that students highly appreciate the introduction of such tools in learning. Moreover, like the entire laboratory, the proposed model can be used in the educational process offline and with distance learning. Finally, the article describes the experience and results of the software package’s development and integration for the spectrum analyzer’s computer model and virtual laboratory work using the MS VS environment in C ++. The results of the conducted work demonstrate the versatility of the proposed approach, its positive impact on the educational process, high potential in the other spheres.
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Kalpana, G., Raja Krishnamoorthy, and P. T. Kalaivaani. "Design and implementation of low-power CMOS biosignal amplifier for active electrode in biomedical application using subthreshold biasing strategy." International Journal of Wavelets, Multiresolution and Information Processing 18, no. 01 (May 29, 2019): 1941017. http://dx.doi.org/10.1142/s0219691319410170.
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Active Electrodes (AEs) are electrodes which have integrated bio-amplifier circuitry and are known to be less susceptible to motion artifacts and environmental interference. In this work, a low-power and high-input impedance amplifier for active electrode application is implemented based on subthreshold biasing strategies. In this proposed Application Specific Integrated Circuit (ASIC) device was versatile and numerical to achieve a high degree of programmability. It could be adapted to any other external part of one cochlear prosthesis, the sound analyzer that could be driven by a Digital Signal Processor (DSP). This research work also discusses the measurement of the electrode-skin impedance mismatch between two electrodes while concurrently measuring a bioelectrical signal without degradation of the performance of the amplifier, the efficient, noise-optimized analysis of bioelectrical signals utilizing two-wired active buffer electrodes. The reduction of power-line interference when using amplifying electrodes employing autonomous adaption of the gain of the subsequent differential amplification. The amplifier’s features include offset compensation, Common Mode Rejection Ratio (CMRR) improvement in software and a bandwidth extending down to DC. The proposed active electrode amplifier is designed using 90 nm CMOS technology. Simulation results exhibit up to the change in noise immunity and lessening in power utilization contrasted with the traditional bio-amplifier design at a similar delay.
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Reggiannini, Brian, Stephen J. Sheinkopf, Harvey F. Silverman, Xiaoxue Li, and Barry M. Lester. "A Flexible Analysis Tool for the Quantitative Acoustic Assessment of Infant Cry." Journal of Speech, Language, and Hearing Research 56, no. 5 (October 2013): 1416–28. http://dx.doi.org/10.1044/1092-4388(2013/11-0298).
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Purpose In this article, the authors describe and validate the performance of a modern acoustic analyzer specifically designed for infant cry analysis. Method Utilizing known algorithms, the authors developed a method to extract acoustic parameters describing infant cries from standard digital audio files. They used a frame rate of 25 ms with a frame advance of 12.5 ms. Cepstral-based acoustic analysis proceeded in 2 phases, computing frame-level data and then organizing and summarizing this information within cry utterances. Using signal detection methods, the authors evaluated the accuracy of the automated system to determine voicing and to detect fundamental frequency (F 0 ) as compared to voiced segments and pitch periods manually coded from spectrogram displays. Results The system detected F 0 with 88% to 95% accuracy, depending on tolerances set at 10 to 20 Hz. Receiver operating characteristic analyses demonstrated very high accuracy at detecting voicing characteristics in the cry samples. Conclusions This article describes an automated infant cry analyzer with high accuracy to detect important acoustic features of cry. A unique and important aspect of this work is the rigorous testing of the system's accuracy as compared to ground-truth manual coding. The resulting system has implications for basic and applied research on infant cry development.
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Sahu, Anil Kumar, Vivek Kumar Chandra, and G. R. Sinha. "Optimized System Level Hardware Realization of Built-in-Self-Test Approach for Sigma-Delta Analog-to-Digital Converter." International Journal of Electrical and Electronics Research 4, no. 3 (September 30, 2016): 85–90. http://dx.doi.org/10.37391/ijeer.040305.
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System-level modeling is generally needed due to simultaneous increase in design complexity with multi-million gate designs in today’s system-on-chips (SoCs). System C is generally applied to system-level modeling of Sigma-Delta ADC. CORDIC technique and test generation for the testing of mixed signal circuit components such as analog-to-digital converter is mostly implemented in system level modeling. This work focuses on developing fast and yet accurate model of BIST approach for Sigma-Delta ADC. The Sigma-Delta modulator’s ADC static parameters as well as dynamic parameters are degraded. One of the dynamic parameters, signal-to-noise ratio (SNR) is directly obtained by the SIMSIDES (MATLAB SIMULINK tool). Then, the obtained parameters are tested by using Built-in-self-test that is desirable for the VLSI system in order to reduce the non-recurring cost (NRE) per chip by the manufacturer. This paper demonstrates a possibility to realize a simulation of testing strategy of high-resolution Sigma-Delta modulator using MATLAB SIMULINK and Xilinx EDA tool environment. This work also contributes towards the Output Response Analyzer (ORA) being used for testing parameters which help in reducing the difficulties in design of the complete ORA circuit. Moreover, the reusable features of hardware in the computation of different parameters are also improved in the ORA design.