Готові списки джерел за темами / Frequency ratio measurement

Добірка наукової літератури з теми "Frequency ratio measurement"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Frequency ratio measurement"

1

Lu, Yun-Chih, Chi-Hung Wu, and Yi-Jan Emery Chen. "A 65 nm CMOS Statistical Frequency Ratio Calculator for Frequency Measurement." IEEE Transactions on Industrial Electronics 68, no. 4 (April 2021): 3558–66. http://dx.doi.org/10.1109/tie.2020.2977536.

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2

Wei, Zhou, Xuan Zong-Qiang, Yu Jian-Guo, Wang Hai, Zhou Hui, and Li Zhi-Qi. "A Novel Frequency Measurement Method Suitable for a Large Frequency Ratio Condition." Chinese Physics Letters 21, no. 5 (May 2004): 786–88. http://dx.doi.org/10.1088/0256-307x/21/5/006.

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3

JONES, M. J., S. D. MOTTRAM, E. S. LIN, and G. SMITH. "MEASUREMENT OF ENTRAINMENT RATIO DURING HIGH FREQUENCY JET VENTILATION." British Journal of Anaesthesia 65, no. 2 (August 1990): 197–203. http://dx.doi.org/10.1093/bja/65.2.197.

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4

Zhou, Feng, Min Lei, Xiao Dong Yin, and Shu Han Zhang. "Measure Characteristic of UHV Power Frequency Voltage Ratio Standard." Advanced Materials Research 354-355 (October 2011): 1210–15. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.1210.

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In order to meet the urgent needs of voltage measurement traceability and transfer in the construction of ultra-high voltage power grid, 1000kV series standard voltage transformer is developed as the standard instrument, and then its measurement characteristics is tested. According to the theory and construction of the series power frequency voltage ratio standard, semi-insulating transformer voltage summation is proposed to make the voltage ratio measurement of SSTV whose accuracy can reach the 0.02 level trace to the source of national power frequency ratio standard of 500kV successfully. The compatibility is better than compared to traditional voltage coefficient measuring method.
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5

Akamatsu, Daisuke, Masami Yasuda, Hajime Inaba, Kazumoto Hosaka, Takehiko Tanabe, Atsushi Onae, and Feng-Lei Hong. "Frequency ratio measurement of ^171Yb and ^87Sr optical lattice clocks." Optics Express 22, no. 7 (March 27, 2014): 7898. http://dx.doi.org/10.1364/oe.22.007898.

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6

Yang, Yuxuan, Yang Xu, Tian Guan, Lixuan Shi, Jinyu Li, Dongmei Li, Yonghong He, Xiangnan Wang, Zhangyan Li, and Yanhong Ji. "Spectrum Intensity Ratio Detection for Frequency Domain Weak Measurement System." IEEE Photonics Journal 12, no. 4 (August 2020): 1–12. http://dx.doi.org/10.1109/jphot.2019.2942718.

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7

Baranov, Pavel F., Valeriy N. Borikov, and Edvard I. Tsimbalist. "Instrument for Measurement of Transfer Ratio Voltage Transformers." Applied Mechanics and Materials 799-800 (October 2015): 1325–29. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.1325.

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The paper presents the instrument for measurement of transfer ratio voltage transformers in the frequency range. The instrument distinctive feature is measuring of small differential signal of the voltages with sensitivity 2 nV against the background of large common-mode signal. The instrument features, its technical and metrological parameters are also considered.
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8

KATO, Rina, Kanna YAMADA, Yuki MISHINA, and Takeshi KANDA. "Measurement of equivalent ratio in rocket engine high frequency vibration model." Proceedings of Mechanical Engineering Congress, Japan 2021 (2021): J191–04. http://dx.doi.org/10.1299/jsmemecj.2021.j191-04.

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9

Yue, Chang Xi, Enrico Mohns, Feng Zhou, Min Lei, Shu Han Zhang, and Qiong Xiang. "A Complex Voltage Ratio Measurement System for the Audio Frequency Range." Applied Mechanics and Materials 239-240 (December 2012): 278–82. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.278.

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This paper describes the setup of a complex voltage ratio measurement system for the audio frequency range. A wideband two-channel digitizer and a differential analogue channel switching front-end are used as the heart of the system. The complex error, frequency response characteristics and short term stability of the system are tested in this paper. The errors range from 1×10-7at 50 Hz to 10×10-6at 200 kHz in ratio 1:1 test with 6 V input voltages. And errors are below ±8×10-7and ±0.06 μrad in ratio 1:1 test with a 4V power line (50 Hz) input voltage over 64 hours. The test results and comparisons between with and without channel exchange mode confirm the remarkable improvement regarding the suppression of the static mismatch errors of the digitizer and show the usefulness of the system at 50 Hz too.
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Akamatsu, Daisuke, Masami Yasuda, Hajime Inaba, Kazumoto Hosaka, Takehiko Tanabe, Atsushi Onae, and Feng-Lei Hong. "Errata: Frequency ratio measurement of ^171Yb and ^87Sr optical lattice clocks." Optics Express 22, no. 26 (December 19, 2014): 32199. http://dx.doi.org/10.1364/oe.22.032199.

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Дисертації з теми "Frequency ratio measurement"

1

Blackard, Kenneth Lee. "Measurements and models of radio frequency impulsive noise inside buildings." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08182009-040318/.

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Wiles, Andrew Donald. "Modelling Framework for Radio Frequency Spatial Measurement." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/771.

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The main crux of this thesis was to produce a model that was capable of simulating the theoretical performance of different configurations for a spatial measurement system using radio frequency technology. It has been important to study new modalities of spatial measurement since spatial measurement systems are an enabling technology that have allowed for the creation of better medical procedures and techniques, provided valuable data for motion capture in animation and biomechanics, and have improved the quality of manufacturing processes in many industries. However, there has been room for improvement in the functional design and accuracy of spatial measurement systems that will enhance current applications and further develop new applications in medicine, research and industry.

In this thesis, a modelling framework for the investigation of spatial measurement based on radio frequency signals was developed. The simulation framework was designed for the purpose of investigating different position determination algorithms and sensor geomatries. A finite element model using the FEMLAB partial differential equation modelling tool was created for a time-domain model of electromagnetic wave propagation in order to simulate the radio frequency signals travelling from a transmitting source antenna to a set of receiving antenna sensors. Electronic line signals were obtained using a simple receiving infinitesimal dipole model and input into a time difference of arrival localization algorithm. The finite element model results were validated against a set of analytical solutions for the free space case. The accuracy of the localization algorithm was measured against a set of possible applications for a potential radio frequency spatial measurement system design.

It was concluded that the simulation framework was successful should one significant deficiency be corrected in future research endeavours. A phase error was observed in the signals extracted at the receiving antenna locations. This phase error, which can be up to 40°, was attributed to the zeroth order finite elements implemented in the finite element model. This phase error can be corrected in the future if higher order vector elements are introduced into future versions of FEMLAB or via the development of custom finite element analysis software but were not implemented in this thesis due to time constraints. Other improvements were also suggested for future work.
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Maguire, Sean Thomas George. "Attitude determination using low frequency radio polarisation measurements." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708927.

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4

Hellgesson, Markus, and Daniel Andersson. "Design of automatic measurements systems for characterizing RF-components." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-387.

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5

Choeysakul, Chittawan. "Small reverberation chambers for radio frequency emission measurements: a radio astronomy feasibility study." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/2136.

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To use a Reverberation Chamber (RC) below the Lowest Usable Frequency, this thesis applies: multiple receiving antennas; multiple EUT positions; and a modified validation procedure. Emission measurements are then possible down to the first cavity resonance. The design is based on theory and simulations, and validated by on a prototype. The longer measurement times, compare to conventional RCs are acceptable where sensitivity is of concern, e.g. in radio astronomy or defence applications.
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Stuart, Thomas (Thomas Edward Walter). "The measurement of radio frequency complex permeability of thin round wires." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53657.

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Thesis (PhD)--University of Stellenbosch, 2003.
ENGLISH ABSTRACT: This thesis is concerned with the measurement of the complex permeability of thin round wires at radio frequencies. This is of interest as such wires are used in various applications, such as absorbing chaff. Iron and nickel alloys are also used for their good tensile properties but have an undesired electromagnetic effect which needs to be characterised. Although little work has been done in this field in recent decades it remains a relevant problem. In this thesis the advantages of accurate wide-band measurements performed by automatic network analysers are applied to the field. The measurement system is a closed coaxial transmission line with a short circuit termination. The centre conductor is the wire of interest. The surface impedance of the wire is related to complex permeability and is measured using low-loss transmission line approximations applied to half-wavelength resonances. The loss associated with complex permeability is separated from conductivity by a D.C. conductivity measurement. A full wave analysis of the coaxial mode was performed and compared to measured values. The maximum error of the propagation constant was found to be 31% at the highest frequencies and was primarily due to length uncertainties. By varying parameters expected error bands around the measured permeability were found. These bands are of the order 1 and demonstrate that the system is sufficiently robust. The measurement of the permeability of two non-magnetic wires was performed and a relative permeability of 1 was found, demonstrating the correct working of the system. A steel wire was measured and compared to measurements found in literature. The permeability dropped as frequency rose as was expected, and an acceptable comparison to other measurements was made as there is no verification standard. Thus a simple measurement system that takes advantage of calibrated automatic network analyser measurements has been developed and demonstrated to work with sufficient accuracy.
AFRIKAANSE OPSOMMING: In hierdie tesis word die meting van die komplekse permeabiliteit van dun ronde drade by radio frekwensies ondersoek. Hierdie drade word in verskeie toepassings gebruik, waaronder dié van absorberende materiale. Nikkel- en ysterallooie word ook vir hul goeie breekkrageienskappe gebruik. In laasgenoemde gevalle moet die ongewenste elektromagnetiese effekte wat voorkom, gekarakteriseer word. Hoewel baie min werk in onlangse dekades gedoen is, bly die meting van die komplekse permeabiliteit 'n relevante probleem. In hierdie tesis word die voordele van akkurate wyeband metings, soos geneem deur 'n outomatiese netwerk analiseerder, toegepas in dié veld. Die meetopstelling is 'n geslote koaksiale transmissielyn, kortgesluit aan een end. Die middel geleier is die draad van belang. Die oppervlak impedansie van die draad is verwant aan die komplekse permeabiliteit, en word gemeet deur die gebruik van lae verlies transmissielyn benaderings, soos toegepas op halfgolf resonante frekwensies. Die verlies wat met die komplekse permeabiliteit geassosieer word, word van die geleidingsvermoë onderskei deur 'n G.S. meting van die geleidingsvermoë. 'n Volgolf analise van die koaksiale mode is uitgevoer en met gemete waardes vergelyk. 'n Maksimum fout van 31% by die hoogste frekwensie is in die voortplantingskonstante gevind. Hierdie volg primêr uit onsekerhede in lengte. Deur die parameters te varieer kon 'n verwagte foutband rondom die gemete permeabiliteit gevind word. Hierdie bande is van die orde 1 waaruit volg dat die stelsel 'n genoegsame robuustheid toon. Die komplekse permeabiliteit van twee nie-magnetiese drade is gemeet en 'n relatiewe permeabiliteit van 1 is gevind. Hierdie bevestig die korrekte werking van die stelsel. 'n Staal draad is opgemeet en met gepubliseerde meetresultate vergelyk. Soos verwag, verminder die permeabiliteit met 'n verhoging in frekwensie. Hoewel geen verifiëringstandaard beskikbaar is nie, is 'n aanvaarbare vergelyking met ander metings gemaak. Die produk van die navorsing is 'n metingstelsel wat, met behulp van 'n gekalibreerde outomatiese netwerk analiseerder, aanvaarbare akkuraatheid in die meting van die komplekse permeabiliteit van dun ronde drade by radio frekwensies kan verkry.
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7

Tigga, Celine. "Modelling of Measurement Equipment for High Frequency Electromagnetic Fields." Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-18894.

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The aim of this thesis was to develop a model of a receiver which could be quickly used to analyze radiated interference levels from data captured at the output of the antenna equipment used to measure radiated energy. Active circuits were mainly used in developing this model for the ease with which the design and simulations could be carried out in OrCAD. The guiding document for the thesis work has been CISPR 16-1-1 (International Special Committee on Radio Interference part 16-1-1) which specifies the characteristics and performance of equipment for the measurement of radiated interference. The testing of this receiver model was carried out as far as possible based on the test setups recommended in CISPR, and all results have been compared with the standards laid down for the model. Using the results, it will be shown that a CISPR EMI receiver can be modeled as a simple EMI receiver consisting of filtering, mixing and detecting circuits built according to specifications.
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8

Hammoudeh, A. "Millimetric wavelength mobile radio characterisation and frequency diversity propagation measurements." Thesis, University of Bath, 1990. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256904.

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9

Landin, Per. "On radio frequency behavioral modeling measurement techniques, devices and validation aspects /." Licentiate thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11678.

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Landin, Per N. "On Radio Frequency Behavioral Modeling : Measurement Techniques, Devices and Validation Aspects." Licentiate thesis, KTH, Signalbehandling, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11678.

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Effektförstärkare för radiofrekvensapplikationer utgör fortfarande ett av de största problemen i trådlösa kommunikationssystem. Detta beror på att dessa förstärkare är ickelinjära, har låg energieffektivitet och ger mycket distortioner. Bättre verktyg för att förstå och korrigera dessa beteenden är nödvändiga. Ett sådant verktyg är beteendemodellering. En beteendemodell kan ses som en svart låda med insignal(er) och utsignal(er). In detta fall är dessa signaler samplade basbandssignaler och den svarta lådan är en matematisk relation mellan en insignal och en utsignal. Avhandlingen behandlar några krav för beteendemodellering av nämnda system genom att presentera metoder för utvärdering och förbättring av modellernas prestanda. Detta åstadkoms genom att betrakta ett frekvensviktat felkriterium. Ett högpresterande mätsystem är också nödvändigt för experimenten. Prestandan hos det tillgängliga systemet jämförs med prestandan hos ett allmänt erkänt mätsystem, en s.k. storsignalsnätverksanalysator, genom att betrakta prestandan hos beteendemodellerna som extraheras och valideras med data från respektive mätsystem. Resultatet visar att det existerande mätsystemet har god prestanda. Ett stort problem vid beteendemodellering är att kunna sampla med tillräckligt hög hastighet. Genom att använda Zhu-Franks generaliserade samplingsteorem vid beteendemodellering kan en del av detta problem undvikas. Teoremet medför att man kan sampla med en väsentligt lägre samlingsfrekvens än vad Nyquistteoremet säger. Modeller extraheras och prestandan utvärderas genom att använda kriteriet normalized mean square error (NMSE). För stabil prediktion och korrektion av utsignalen måste robustheten hos de använda modellerna verifieras. En sådan studie som berör robustheten mot variationer i lastimpedansen har genomförts. Prestandan på direkta modeller försämras med 7 dB mätt som adjacent channel error power ratio (ACEPR). Prestanda på inversmodellen, implementerad som digital predistortion, försämras med upp till 13 dB mätt som adjacent channel power ratio (ACPR).
Radio frequency (RF) power amplifiers (PA) are still the most troublesomepart of a wireless system due to their inherent nonlinearity, low powerefficiency and high distortions. Better tools are needed to understand and correct the undesirable behavior. Some of these tools are behavioral models. A behavioral model is often thought of as a black box with some inputs andsome outputs. In the case here these inputs are sampled signals which meansthat the modeling amounts to finding a mathematical relationship betweenthe input signal(s) and the output signal(s). This thesis considers some requirements for behavioral modeling of said systems by presenting methods for general performance evaluation and improvement by considering a frequency weighted error criterion. A high performance measurement system is also needed. The performance of the available system is compared to the performance of a well recognized system, the largesignal network analyzer (LSNA). The results show that the existing measurementsystem can extract behavioral models with the same performance as the LSNA and can give lower performance validation errors. Still the need for higher bandwidths drives the measurement systems to the limits, especially the digital parts. By utilizing the so called Zhu-Frank generalized sampling theorem, behavioral modeling of a PA is done by using data acquired at a sampling rate lower than the Nyquist rate. Models of a PA are extracted and the performance is evaluated using the normalized meansquare error (NMSE) criterion. For prediction and correction of the output signals the stability of the models regarding changes must be investigated. One such study considering controlled variations on the output load of the PA is done and both the predictive and corrective capabilities of the models are evaluated. The predictive capability gets up to 7 dB worse measured as adjacent channel error powerratio (ACEPR) and the corrective, as digital predistortion, gets up to 13 dB worse measured as adjacent channel power ratio (ACPR).
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Книги з теми "Frequency ratio measurement"

1

1935-, Smith Albert A., ed. Measuring the radio frequency environment. New York: Van Nostrand Reinhold Co., 1985.

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2

Radio frequency & microwave power measurement. London, U.K: P. Peregrinus on behalf of the Institution of Electrical Engineers, 1990.

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3

Kamas, George. Time and frequency users manual. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1990.

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4

Kamas, George. Time and frequency users manual. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1990.

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5

Group, Automatic RF Techniques, ed. Measurement accuracy: 61st ARFTG conference digest : Spring, 2003 : Friday 13 June, 2003, Pennsylvania Convention Center, Philadelphia, PA. [Piscataway, N.J: IEEE, 2003.

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6

Group, Automatic RF Techniques, ed. Measurement needs for emerging technologies: 60th ARFTG conference digest : fall 2002 : December 5th & 6th, 2002, Washington, D.C. Piscataway, N.J: IEEE, 2002.

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7

Sanders, Frank H. Measurement procedures for the Radar Spectrum Engineering Criteria (RSEC). Boulder, CO: U.S. Department of Commerce, 2005.

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8

Practical radio frequency test and measurement: A technician's handbook. Boston: Newnes, 1999.

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9

Beehler, Roger E. NIST time and frequency services. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.

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10

A, Lombardi Michael, and National Institute of Standards and Technology (U.S.), eds. NIST time and frequency services. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.

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Частини книг з теми "Frequency ratio measurement"

1

Köhler-Langes, Florian. "Towards the Measurement of the Larmor-to-Cyclotron Frequency Ratio." In The Electron Mass and Calcium Isotope Shifts, 75–116. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50877-1_4.

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2

Skomal, Edward N., and Albert A. Smith. "Radio Frequency Measurements." In Measuring the Radio Frequency Environment, 1–7. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-011-7059-8_1.

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Raghunandan, Krishnamurthy. "Radio Frequency Measurements." In Introduction to Wireless Communications and Networks, 405–59. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92188-0_19.

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4

Tamaru, Shingo. "Radio-Frequency (RF) Permeameter." In Magnetic Measurement Techniques for Materials Characterization, 407–30. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70443-8_15.

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Sugiura, Masakatsu, Ryuji Ozeki, and Masaichiro Seika. "An Application of Image-Processing to Stress Measurement by Copper Plating Foil (On the Effect of Frequency, Stress Ratio and Stress Waveform)." In Experimental Analysis of Nano and Engineering Materials and Structures, 513–14. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_254.

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6

Roussy, Georges. "Measurement Techniques for Microwave and RF Processing." In Advances in Microwave and Radio Frequency Processing, 65–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-32944-2_8.

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Avoine, Gildas, Iwen Coisel, and Tania Martin. "Time Measurement Threatens Privacy-Friendly RFID Authentication Protocols." In Radio Frequency Identification: Security and Privacy Issues, 138–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16822-2_13.

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Keller, Reto B. "RF Parameters." In Design for Electromagnetic Compatibility--In a Nutshell, 49–63. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14186-7_6.

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AbstractThis section introduces some of the most common radio-frequency (RF) parameters used in the field of EMC and high-frequency circuit design and measurement. A particular emphasis lays on the term impedance matching and distinguishing between good and poor impedance matching.
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Link, G., S. Rhee, and Manfred Thumm. "Dilatometer Measurements in a mm-Wave Oven." In Advances in Microwave and Radio Frequency Processing, 506–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-32944-2_54.

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Fraser-Smith, A. C., P. R. McGill, A. Bernardi, R. A. Helliwell, and M. E. Ladd. "Global Measurements of Low-Frequency Radio Noise." In Environmental and Space Electromagnetics, 191–200. Tokyo: Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68162-5_19.

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Тези доповідей конференцій з теми "Frequency ratio measurement"

1

Muggli, P. "Velocity ratio measurement using the frequency of backward wave oscillations." In 15th International Conference on Infrared and Millimeter Waves. SPIE, 1990. http://dx.doi.org/10.1117/12.2301536.

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2

Bortz, John C. "Remote Angular Frequency Measurement Through Turbulence." In Photon Correlation Techniques and Applications. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/pcta.1988.dsopp203.

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A performance model is developed for an angular frequency measurement technique based on photon correlation. The purpose of the technique is to measure the rate of rotation of a remote diffusely reflecting target. Coherent illumination of the target produces a speckle pattern that is sampled temporally and spatially by an array of photodetectors. The collected data are processed to obtain an estimate of the spatiotemporal cross correlation function for the speckle irradiance. The position of the correlation peak for a particular time delay provides a measure of the speckle velocity, which, combined with the known range and transverse velocity of the target, allows the transverse component of the target's angular frequency (i.e., rotation rate) vector to be calculated. The performance model includes the effects of atmospheric turbulence, clear-weather atmospheric attentuation, dark count, background radiation, dead time, spatiotemporal integration, photon noise, and classical measurement noise. Expressions for the signal-to-noise ratio, signal biasing, angular frequency resolution, and the maximum measurable angular frequency are derived.
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3

Dolfi, David W., and David K. Donald. "Heterodyne Measurement of Optical Modulator Frequency Response." In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/igwo.1988.mf7.

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As the bandwidth of optical modulators increases, it becomes more difficult to measure their frequency response. A number of methods are currently in use, including direct detection using a fast, calibrated photodiode [1], the a.m. sideband technique [2], and an optical sampling technique [3]. The first of these is straightforward, but requires a calibrated photodiode with a bandwidth comparable to the modulator under test. The a.m. sideband technique requires non-linear behavior by the modulator. Further, it exhibits a second order dependence of the measured signal on the modulator response and drive voltage, leading to a decreased signal-to-noise ratio. The third technique requires the use of two r.f. sources as well as a source of fast optical pulses (e.g. a mode-locked laser).
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4

O’Malley, Patrick F., Joseph F. Vignola, and John A. Judge. "Amplitude and Frequency Dependence of the Signal-to-Noise Ratio in LDV Measurements." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48692.

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When making measurements using many sensors, it is expected that, within normal operating ranges, the signal-to-noise ratio is approximately linear (i.e. 20 dB/decade). This generality does not hold, however, when making measurements using a laser Doppler vibrometer (LDV). If the velocity of the target of an LDV measurement increases by an order of magnitude, changes in the speckle pattern will introduce noise into the measurand. An experiment was conducted using an LDV system to measure the velocity response of a speaker excited over several orders of magnitude in both frequency and amplitude. Results are presented showing the relationship between signal-to-noise ratio and vibration amplitude.
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5

Ohtsubo, N., Y. Li, N. Nemitz, H. Hachisu, K. Matsubara, T. Ido, and K. Hayasaka. "Measurement of the Frequency Ratio of 115In+ ion Clock and 87Sr Optical Lattice Clock." In 52nd Annual Precise Time and Time Interval Systems and Applications Meeting. Institute of Navigation, 2021. http://dx.doi.org/10.33012/2021.17786.

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6

Afshar V., Shahraam, Graham A. Ferrier, Xiaoyi Bao, and Liang Chen. "Impact of EOM extinction ratio on the Brillouin frequency measurement of distributed fiber optic sensors." In Applications of Photonic Technology, edited by Roger A. Lessard and George A. Lampropoulos. SPIE, 2003. http://dx.doi.org/10.1117/12.543842.

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7

Daisuke Akamatsu, Masami Yasuda, Takuya Kohno, Kazumoto Hosaka, Hajime Inaba, Yoshiaki Nakajima, and Feng-Lei Hong. "Toward the Yb/Sr frequency ratio measurement: Development of the Sr optical lattice clock at NMIJ, AIST." In 2010 Conference on Precision Electromagnetic Measurements (CPEM 2010). IEEE, 2010. http://dx.doi.org/10.1109/cpem.2010.5545275.

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8

Inagaki, Keizo, Ukrit Mankong, and Tetsuya Kawanishi. "Error analysis of optoelectronic frequency response measurement of photodiodes using high-extinction ratio Mach-Zehnder modulator." In 2012 11th International Conference on Optical Communications and Networks (ICOCN). IEEE, 2012. http://dx.doi.org/10.1109/icocn.2012.6486225.

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9

Rosker, M. J., I. McMichael, and R. Saxena. "Measurement of frequency locking in phase-conjugate optical gyroscopes." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.mw4.

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A ring resonator containing a phase-conjugate mirror can act as a phase-conjugate optical gyroscope (PCOG).1 The frequencies of the counterpropagating oscillations depend on the nonreciprocal, but not on the reciprocal, optical path length of the resonator; thus, the device is potentially useful for inertial sensing of rotational motion. A primary limitation of conventional ring-laser gyroscopes is frequency-locking behavior, wherein backscattering couples the counterpropagating laser oscillations. Our previous theoretical results2 indicated that, for nonreciprocal phase shifts of ~π/10 rad, frequency locking occurs when the ratio of backscattered light to pump light exceeds ~10-3. We describe our experimental investigation of the frequency-locking characteristics for the ring PCOG. A weak seed beam was injected into the oscillator along the same direction as the phase-conjugate output. The frequency difference between the counterpropagating waves was measured as a function of the seed intensity and the nonreciprocal phase shift. Measurements were made with both coherent and incoherent (with respect to the pump) seed light to simulate scatter contributed by the phase-conjugate and conventional mirrors, respectively. The experimental results are in good agreement with theory.
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10

Hirai, Akihito, Koji Tsutsumi, Masaomi Tsuru, Kazutomi Mori, and Mitsuhiro Shimozawa. "A 0.1-to-10 GHz Digital Frequency Discriminator IC with Time to Digital Converter and Adaptive Control of Frequency Division Ratio for Instantaneous Frequency Measurement." In 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019. IEEE, 2019. http://dx.doi.org/10.1109/mwsym.2019.8700846.

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Звіти організацій з теми "Frequency ratio measurement"

1

Fraser-Smith, A. C., P. R. McGill, A. Bernardi, R. A. Helliwell, and M. E. Ladd. Global Measurements of Low-Frequency Radio Noise. Fort Belvoir, VA: Defense Technical Information Center, February 1992. http://dx.doi.org/10.21236/ada248260.

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2

Cutsogeorge, G. Amplitude and phase detector for radio frequency measurements. Office of Scientific and Technical Information (OSTI), September 1988. http://dx.doi.org/10.2172/7029262.

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3

Haedrich, Caitlin, and Daniel Breton. Measuring very high frequency and ultrahigh frequency radio noise in urban environments : a mobile measurement system for radio-frequency noise. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33290.

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4

Breton, Daniel, Caitlin Haedrich, Garrett Hoch, Samuel Streeter, and Michele Maxson. The urban ground-to-ground radio-frequency channel : measurement and modeling in the ultrahigh frequency band. Engineer Research and Development Center (U.S.), July 2020. http://dx.doi.org/10.21079/11681/37554.

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5

Haedrich, Caitlin, Daniel Breton, and D. Wilson. Preliminary measurements on the geography of urban VHF radio-frequency noise. Engineer Research and Development Center (U.S.), August 2020. http://dx.doi.org/10.21079/11681/37962.

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6

Mokole, Eric L., Mark Parent, Surendra N. Samaddar, Edmond Tomas, and Brian T. Gold. Radio-Frequency Propagation Measurements in Confined Ship Spaces Aboard the ex-USS Shadwell. Fort Belvoir, VA: Defense Technical Information Center, August 2000. http://dx.doi.org/10.21236/ada381789.

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7

van der Heijden, Joost. Optimizing electron temperature in quantum dot devices. QDevil ApS, March 2021. http://dx.doi.org/10.53109/ypdh3824.

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The performance and accuracy of quantum electronics is substantially degraded when the temperature of the electrons in the devices is too high. The electron temperature can be reduced with appropriate thermal anchoring and by filtering both the low frequency and radio frequency noise. Ultimately, for high performance filters the electron temperature can approach the phonon temperature (as measured by resistive thermometers) in a dilution refrigerator. In this application note, the method for measuring the electron temperature in a typical quantum electronics device using Coulomb blockade thermometry is described. This technique is applied to find the readily achievable electron temperature in the device when using the QFilter provided by QDevil. With our thermometry measurements, using a single GaAs/AlGaAs quantum dot in an optimized experimental setup, we determined an electron temperature of 28 ± 2 milli-Kelvin for a dilution refrigerator base temperature of 18 milli-Kelvin.
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8

Hammett, G. W., R. Kaita, and J. R. Wilson. Measurements of energetic helium-3 minority distributions during ion cyclotron radio-frequency heating in the Princeton Large Torus. Office of Scientific and Technical Information (OSTI), March 1988. http://dx.doi.org/10.2172/5153891.

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9

Jursich, Mark. Peak radiated power measurement of the DOE Mark II container tag with integrated ST-676 sensor radio frequency identification device. Office of Scientific and Technical Information (OSTI), April 2010. http://dx.doi.org/10.2172/983687.

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10

McKinney, Jason D., and John Diehl. Measurement of Chromatic Dispersion using the Baseband Radio-Frequency Response of a Phase-Modulated Analog Optical Link Employing a Reference Fiber. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada472284.

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