Relevant bibliographies by topics / Diode laser sensor

Academic literature on the topic 'Diode laser sensor'

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Published: 4 June 2021
Last updated: 29 January 2023

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Journal articles on the topic "Diode laser sensor"

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Alfianda, Alfianda, Muhammad Amin, and Risnawati Risnawati. "Perancangan Pengisian Pada Dispenser Dengan Memanfaatkan Sensor Dan Embedded System." J-Com (Journal of Computer) 1, no. 2 (July 31, 2021): 147–52. http://dx.doi.org/10.33330/j-com.v2i1.1246.

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Abstract: Nowadays, almost all of them use a dispenser, because of its practicality. But behind that there are several things that make the dispenser less efficient when taking drinking water from the glass, because the user has to press or turn the water tap in the dispenser. The working system of this tool is where the machine will run according to the commands obtained from the laser diode and the LDR sensor, the laser diode will reflect light that leads to the LDR. when the light reflected by the laser diode to the LDR is cut, it can be interpreted that the LDR and the laser diode detect or read the presence of an object in the form of a glass, automatically the two sensors instruct the controller to activate the water pump and the water pump will work to remove the water which will be filled in the glass that is placed in the dispenser with the volume of the glass used, the filling process and the end of filling will be displayed by the LCD and when filling the water the glass is full there will be a warning from the buzzer in the form of a sound. Users no longer need to press or turn the water tap when taking water from the dispenser using a glass. Keywords: Dispensers;LDR Sensor;Diode Laser and Tools Abstrak: Pada saat ini masyarakat sekarang sudah hampir semuanya menggunakan dispenser, karena kepraktisan. Namun dibalik itu semua ada beberapa hal yang membuat dispenser kurang efisien saat mengambil air minum pada gelas, karena pengguna harus menekan atau memutar keran air yang ada pada dispenser. Sistem kerja dari alat ini ialah dimana mesin akan berjalan sesuai dengan perintah yang didapat dari Dioda laser dan sensor LDR, Dioda laser akan memantulkan cahaya yang mengarah pada LDR, pada saat cahaya yang dipantulkan Dioda laser ke LDR terpotong maka dapat diartikan LDR dan Dioda laser mendeteksi atau membaca adanya benda berupa gelas, secara otomatis kedua sensor tersebut memerintahkan controller mengaktifkan pompa air dan pompa air akan bekerja mengeluarkan air yang akan diisikan pada gelas yang diletakkan pada dispenser dengan volume gelas yang digunakan, proses pengisian dan akhir pengisian akan ditampilkan oleh LCD dan saat pengisian air pada gelas penuh akan ada peringatan dari buzzer berupa bunyi. Pengguna tidak perlu lagi menekan atau memutar keran air saat mengambil air pada dispenser menggunakan gelas. Kata Kunci : Dispenser;Sensor LDR;Dioda Laser dan Alat
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Lu, Rong Jun, De Ming Shen, Qian Qian Du, Bao Zhen Huang, and Jian Shu Shi. "Tuning Characteristics of DFB Diode Laser and its Application to TDLAS Gas Sensor Design." Applied Mechanics and Materials 511-512 (February 2014): 173–77. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.173.

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Static and dynamic tuning characteristics of Distribute Feedback (DFB) diode lasers are investigated with practical laser devices. These characteristics are the basic guidelines for practical TDLAS sensors design. Static tuning characteristics help to select suitable diode lasers from limited available laser devices with specific wavelength and to set an appropriate working current and temperature. Dynamic tuning characteristics decide the sweep speed of current slope in both direct absorb Spectroscopy (DAS) and wavelength modulation Spectroscopy (WMS). Because of nonlinearity in the relation between wavelength and tuning current, the measured spectral line position should be corrected by the dynamic characteristics. For WMS, current tuning efficient and IM/AM (Intense modulation/Amplitude modulation) differential phase could be utilized to optimize laser modulation and harmonic components demodulation.
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El-Agmy, Reda M., and Najm M. Al-Hosiny. "Thermal analysis and CW laser operation at 1.998 µm in end pumped Tm:YAP lasers." Photonics Letters of Poland 11, no. 4 (December 31, 2019): 103. http://dx.doi.org/10.4302/plp.v11i4.938.

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We report on thermal analysis and a continuous wave (CW) laser operation at (1.998µm) of end pumped Tm: YAP cylindrical laser rod. The Tm: YAP laser rod is pumped at a wavelength of 1.064 µm emitting from Nd: YAG laser source. A 3W incident pump power is used to generate a maximum laser output of 700 mW, representing 18% slope efficiency. The power of thermally induced lens in Tm:YAP laser rod is numerically analyzed and validated experimentally. The focal lengths of the thermally induced lens are directly measured using Shack-Hartmann wavefront sensor. We have detected blue up-conversion fluorescence emission before laser operation at 1.998 µm. The obtained experimental results were in good agreement with the numerical calculations. Full Text: PDF ReferencesI. F. Elder, J. Payne, "Diode-pumped, room-temperature Tm:YAP laser", Applied Optics 36 (33), 8606 (1997) CrossRef Y. Li, B. Yao, Y. Wang, Y. Ju, G. Zhao, Y. Zong, J. Xu, "High efficient diode-pumped Tm:YAP laser at room temperature", Chinese Opt. Lett. 5 (5), 286 (2007). DirectLink H. Ni, S. C. Rand, "Avalanche upconversion in Tm:YALO3", Opt. Lett. 16 (8), 1424 (1991). CrossRef Z. G. Wang, C. W. Song, Y. F. Li, Y. L. Ju, Y. Z. Wang, "CW and pulsed operation of a diode-end-pumped Tm:GdVO4 laser at room temperature", Laser Phys. Lett. 6 (2), 105 (2009). CrossRef Baoquan Yao, Yi Tian, Wei Wang, Gang Li, Yuezhu Wang, "Analysis and compensation of thermal lens effects in Tm:YAP lasers", Chinese Opt. Lett. 8 (10), 996 (2010). CrossRef F. Cornacchia, D. Parisi, C. Bernardini, M. Toncelli, "Efficient, diode-pumped Tm3+:BaY2F8 vibronic laser", Opt. Expr. 12 (9), 1982 (2004). CrossRef Xiaojin Cheng, Mi Fan, Jiandong Cao, Jianhua Shang, "Research on the thermal effect and laser resonator of diode-pumped thin-slab Tm:YAP lasers", Optik 176, 32 (2019). CrossRef W. Koechner, Solid-state Laser Engineering, Springer, (2013). DirectLink https://www.crytur.cz DirectLink http://www.laserlabcomponents.com/ DirectLink R. M. El-Agmy, N.AlHosiny, "2.31 [micro sign]m laser under up-conversion pumping at 1.064 [micro sign]m in Tm3+:ZBLAN fibre lasers", Elect. Lett. 46 (13), 936 (2010). CrossRef R. M. El-Agmy, N. M. Al-Hosiny, "870 mW blue laser emission at 480 nm in a large core thulium doped ZBLAN fiber laser", Laser Phys. 20 (4), 838 (2010). CrossRef R. M. El-Agmy, N. M. Al-Hosiny, "Power scaling of end-pumped Nd:YLF lasers, modeling and experiments", Optik 140, 584 (2017). CrossRef R. M. El-Agmy, N. Al-Hosiny, "Thermal analysis and experimental study of end-pumped Nd: YLF laser at 1053 nm", Photonic sensors 7 (4), 329 (2017). CrossRef S. C. Tidwell, J. F. Seamans, M. S. Bowers, A. K. Cousins, "Scaling CW diode-end-pumped Nd:YAG lasers to high average powers", IEEE J. Quantum Electron. 28, 997 (1992). CrossRef P. J. Hardman, W. A. Clarkson, G. J. Friel, M. Pollnau, D. C. Hanna, "Energy-transfer upconversion and thermal lensing in high-power end-pumped Nd:YLF laser crystals", IEEE Journal of Quantum Electronics 35, 647 (1999). CrossRef
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Kato, Jun-ichi, Takahashi Mori, and Ichirou Yamaguchi. "Optical feedback displacement sensor using a laser diode." Optics & Laser Technology 24, no. 3 (June 1992): 157. http://dx.doi.org/10.1016/0030-3992(92)90108-e.

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Avetisov, Viacheslav, Ove Bjoroey, Junyang Wang, Peter Geiser, and Ketil Gorm Paulsen. "Hydrogen Sensor Based on Tunable Diode Laser Absorption Spectroscopy." Sensors 19, no. 23 (December 3, 2019): 5313. http://dx.doi.org/10.3390/s19235313.

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A laser-based hydrogen (H2) sensor using wavelength modulation spectroscopy (WMS) was developed for the contactless measurement of molecular hydrogen. The sensor uses a distributed feedback (DFB) laser to target the H2 quadrupole absorption line at 2121.8 nm. The H2 absorption line exhibited weak collisional broadening and strong collisional narrowing effects. Both effects were investigated by comparing measurements of the absorption linewidth with detailed models using different line profiles including collisional narrowing effects. The collisional broadening and narrowing parameters were determined for pure hydrogen as well as for hydrogen in nitrogen and air. The performance of the sensor was evaluated and the sensor applicability for H2 measurement in a range of 0–10 %v of H2 was demonstrated. A precision of 0.02 %v was achieved with 1 m of absorption pathlength (0.02 %v∙m) and 1 s of integration time. For the optimum averaging time of 20 s, precision of 0.005 %v∙m was achieved. A good linear relationship between H2 concentration and sensor response was observed. A simple and robust transmitter–receiver configuration of the sensor allows in situ installation in harsh industrial environments.
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Komoriya, Kiyoshi, and Kazuo Tani. "Development of a Laser Range Sensor for a Mobile Robot." Journal of Robotics and Mechatronics 3, no. 5 (October 20, 1991): 373–78. http://dx.doi.org/10.20965/jrm.1991.p0373.

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External sensors which can detect environmental information are important for a mobile robot to recognize its surroundings and location. Among external sensors, range sensors are fundamental because they can directly detect the free space in which the mobile robot can move without colliding with the surrounding objects. A laser range sensor provides good spatial resolution, and it is expected to detect characteristic parts of the environment used as landmarks for recognizing robot position. This paper presents the construction of a laser range sensor system which can be implemented in a small mobile robot. The system consists of several components including laser diode, CCD camera, and mark detection hardware. Based on triangulation method, the system can detect the distance to the object's surface on which the beam spot is directed. In order to detect a landmark, such as a wall edge, the sensor system is mounted on a rotary table. By horizontally scanning, the sensor can detect wall edges with an accuracy of approximately 5mm and an orientation accuracy of approximately 1 degree within 3m. This system has been installed in an indoor mobile robot and is used for autonomous navigation control along corridors.
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Kim, Chang Hyun, Tae Yong Choi, Ju Jang Lee, Jeong Suh, Kyoung Taik Park, and Hee Shin Kang. "Reconfigurable 3D Laser-Stripe Sensor for Welding Processes." Materials Science Forum 580-582 (June 2008): 691–94. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.691.

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This paper describes the development of a reconfigurable 3D profile measurement system for welding robot. The system consists of a PC based vision camera and a stripe-type laser diode. The total system is assembled into a compact module which can be attached to the endeffector of welding robots. Especially, the developed system is designed to operate at different working distances. For this purpose, the reconfigurable mechanism which adjusts the focal length and the relative position between the camera and the laser diode is devised. These two configurations are automatically changing, according to the current working distance. Most parts of image processing such as camera calibration, correction of distortion, and line extraction are implemented and running on the PC. After measuring the welding profile, the 3D shape of the parent metal is obtained and some useful features for robot manipulation are calculated.
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Vollmerhausen, Richard H. "Small Obstacle Avoidance Sensor." Scientific World Journal 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/604538.

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This paper describes a laser ranging sensor that is suitable for applications like small unmanned aerial vehicles. The hardware consists of a diode emitter array and line-scan charge coupled devices. A structured-light technique measures ranges up to 30 meters for 64 field angles in a 90 degree field of view. Operation is eye safe, and the laser wavelength is not visible to night vision goggles. This paper describes a specific sensor design in order to illustrate performance for a given package size.
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Lee, Sanghoon, Dongkyu Lee, Pyung Choi, and Daejin Park. "Accuracy–Power Controllable LiDAR Sensor System with 3D Object Recognition for Autonomous Vehicle." Sensors 20, no. 19 (October 7, 2020): 5706. http://dx.doi.org/10.3390/s20195706.

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Light detection and ranging (LiDAR) sensors help autonomous vehicles detect the surrounding environment and the exact distance to an object’s position. Conventional LiDAR sensors require a certain amount of power consumption because they detect objects by transmitting lasers at a regular interval according to a horizontal angular resolution (HAR). However, because the LiDAR sensors, which continuously consume power inefficiently, have a fatal effect on autonomous and electric vehicles using battery power, power consumption efficiency needs to be improved. In this paper, we propose algorithms to improve the inefficient power consumption of conventional LiDAR sensors, and efficiently reduce power consumption in two ways: (a) controlling the HAR to vary the laser transmission period (TP) of a laser diode (LD) depending on the vehicle’s speed and (b) reducing the static power consumption using a sleep mode, depending on the surrounding environment. The proposed LiDAR sensor with the HAR control algorithm reduces the power consumption of the LD by 6.92% to 32.43% depending on the vehicle’s speed, compared to the maximum number of laser transmissions (Nx.max). The sleep mode with a surrounding environment-sensing algorithm reduces the power consumption by 61.09%. The algorithm of the proposed LiDAR sensor was tested on a commercial processor chip, and the integrated processor was designed as an IC using the Global Foundries 55 nm CMOS process.
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Choi, Kyoo Nam. "Distributed Intrusion Sensor Using DFB Laser with Optical Feedback and Saturable Absorber." Journal of Sensors 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/4848254.

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Characteristics of a distributed intrusion sensor using a coherent DFB laser diode with an external optical feedback and saturable absorber were experimentally investigated. The stimulus at a location of 2 km using a PZT transducer placed the location of a simulated intruder in Φ-OTDR trace after averaging 32 times. Field trials demonstrated the detection of a vehicle and a pedestrian crossing above the sensing line and a loop in a burial depth of 50 cm. This distributed intrusion sensor using a coherent DFB laser diode as the light source had the advantages of a simple structure and intruder detection capability at the underground burial location.
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Dissertations / Theses on the topic "Diode laser sensor"

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Burns, Iain Stewart. "A sensor for combustion thermometry based on blue diode lasers." Thesis, University of Cambridge, 2006. https://www.repository.cam.ac.uk/handle/1810/244070.

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Spatially-resolved measurements of flame temperature have been demonstrated with diode lasers for the first time. The technique is based on the use of blue diode lasers to perform laser-induced fluorescence on indium atoms seeded to the flame. Temperature measurements have been carried out in laminar flames both by the two-line atomic fluorescence technique, and also by a novel line-shape thermometry method that requires the use of only a single diode laser. The first part of this work involved the development of blue extended cavity diode lasers with favourable tuning properties. Two custom-designed extended cavity diode lasers (ECDL) have been built, emitting at wavelengths of around 410 nm and 451 nm respectively. These devices are capable of mode-hop free tuning over ranges greater than 90 GHz. The performance of these devices exceeds that of commercially available systems and a patent application has been filed. High resolution fluorescence spectroscopy has been performed on both the 52P1/2→62S1/2 and 52P3/2→62S1/2 transitions of indium atoms seeded at trace quantities into atmospheric pressure flames. In both cases, the spectra obtained show excellent agreement with a theoretical fit based on the individual hyperfine components of the transition. The two ECDLs have been used to build a sensor for the measurement of temperature in combustion systems. It is much simpler, more compact, less expensive, and more versatile than any previously existing device. The two lasers were used sequentially to probe indium atoms seeded to the flame. The ratio of the resulting fluorescence signals is related to the relative populations in the two sub-levels of the spin-orbit split ground state of indium, and thus to the temperature. Temperature measurements have been successfully performed in a laminar flame and the data thus obtained do not need to be corrected by any ‘calibration constant’. This novel thermometry technique offers a robust alternative to traditional methods involving bulky high power lasers. A further development has been made by demonstrating a fluorescence line-shape thermometry technique requiring only a single diode laser excitation source. Progress has been made towards the goal of rapid temperature measurements appropriate to the study of turbulent flames. This involved the development of a simple technique for actively locking the wavelength of the blue diode laser to a resonance line of the tellurium molecule. A high-speed thermometry system would work by rapidly switching between the two locked laser beams using an optical modulator.
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Čožík, Ondřej. "Převodníková karta pro přesné řízení laserové diody." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219460.

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The diploma thesis deals with design of the converter card for the precise control of a laser diode. At first, there are described the principles of the laser diode, photodiode and basic functions of optical fiber sensors. Following chapter deals with description of developed converter card. In the diploma thesis are discussed all function blocks of the converter card and they are explained in detail. In the thesis are subsequently tested all problem parts of the converter card for the precise control of the laser diode, such as fast switching of the current flowing through the laser diode and design of the connection for evaluating of current pulse from the sensing photodiode. An integral part of thesis is a description of created printed circuit board and there are described all used layers and devices’ layout on the PCB. Final part of the diploma thesis deals with firmware for the microcontroller, which was made for testing of all function blocks of the converter card for the precise control of a laser diode. At the same time was developed software for PC, which communicates with the converter card via universal serial bus (USB).
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Griffiths, Alan David, and alan griffiths@anu edu au. "Development and demonstration of a diode laser sensor for a scramjet combustor." The Australian National University. Faculty of Science, 2005. http://thesis.anu.edu.au./public/adt-ANU20051114.132736.

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Hypersonic vehicles, based on scramjet engines, have the potential to deliver inexpensive access to space when compared with rocket propulsion. The technology, however, is in its infancy and there is still much to be learned from fundamental studies.¶ Flows that represent the conditions inside a scramjet engine can be generated in ground tests using a free-piston shock tunnel and a combustor model. These facilities provide a convenient location for fundamental studies and principles learned during ground tests can be applied to the design of a full-scale vehicle.¶ A wide range of diagnostics have been used for studying scramjet flows, including surface measurements and optical visualisation techniques.¶ The aim of this work is to test the effectiveness of tunable diode laser absorption spectroscopy (TDLAS) as a scramjet diagnostic.¶ TDLAS utilises the spectrally narrow emission from a diode laser to probe individual absorption lines of a target species. By varying the diode laser injection current, the laser emission wavelength can be scanned to rapidly obtain a profile of the spectral line. TDLAS has been used previously for gas-dynamic sensing applications and, in the configuration used in this work, is sensitive to temperature and water vapour concentration.¶ The design of the sensor was guided by previous work. It incorporated aspects of designs that were considered to be well suited to the present application. Aspects of the design which were guided by the literature included the laser emission wavelength, the use of fibre optics and the detector used. The laser emission wavelength was near 1390 nm to coincide with relatively strong water vapour transitions. This wavelength allowed the use of telecommunications optical fibre and components for light delivery. Detection used a dual-beam, noise cancelling detector.¶ The sensor was validated before deployment in a low-pressure test cell and a hydrogen–air flame. Temperature and water concentration measurements were verified to within 5% up to 1550 K. Verification accuracy was limited by non-uniformity along the beam path during flame measurements.¶ Measurements were made in a scramjet combustor operating in a flow generated by the T3 shock tunnel at the Australian National University. Within the scramjet combustor, hydrogen was injected into a flame-holding cavity and the sensor was operated downstream in the expanded, supersonic, post-combustion flow. The sensor was operated at a maximum repetition rate of 20 kHz and could resolve variation in temperature and water concentration over the 3ms running time of the facility.¶ Results were repeatable and the measurement uncertainty was smaller than the turbulent fluctuations in the flow. The scramjet was operated at two fuel-lean equivalence ratios and the sensor was able to show differences between the two operating conditions. In addition, vertical traversal of the sensor revealed variation in flow conditions across the scramjet duct.¶ The effectiveness of the diagnostic was tested by comparing results with those from other measurement techniques, in particular pressure and OH fluorescence measurements, as well as comparison with computational simulation.¶ Combustion was noted at both of the tested operating conditions in data from all three measurement techniques.¶ Computation simulation of the scramjet flow significantly under-predicted the water vapour concentration. The discrepancy between experiments and simulation was not apparent in either the pressure measurements or the OH fluorescence, but was clear in the diode laser results.¶ The diode laser sensor, therefore, was able to produce quantitative results which were useful for comparison with a CFD model of the scramjet and were complimentary to information provided by other diagnostics.
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Griffiths, Alan David. "Development and demonstration of a diode laser sensor for a scramjet combustor /." View thesis entry in Australian Digital Theses, 2005. http://thesis.anu.edu.au/public/adt-ANU20051114.132736/index.html.

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Zabit, Usman. "Optimisation of a self-mixing laser displacement sensor." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0129/document.

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L'interférométrie à rétro-injection optique, également connu sous le nom de Self-Mixing, permet de concevoir des capteurs qui sont compacts, auto-alignés et sans contact. Dans ce phénomène, une partie du faisceau laser de retour réfléchi par la cible rentre dans la cavité active de laser et fait varier ses propriétés spectrales. La diode laser agit alors comme une source de lumière, un microinterféromètre ainsi qu'un détecteur de lumière. Dans cette thèse, un capteur de déplacement, basé sur la rétro-injection optique, a été optimisé de sorte que des mesures précises peuvent être obtenues en temps réel. Le capteur est robuste à la disparition des franges de self-mixing pour des vibrations harmoniques. Il est également capable de s'adapter à un changement dans le régime de feedback optique et peut donc extraire le déplacement dans les cas les plus répandus expérimentalement, à savoir un feedback faible puis modéré. L'utilisation de l'optique adaptative, sous la forme d'une lentille liquide, a également été démontrée pour ce capteur, ce qui nous a permis de maintenir le capteur dans un régime de feedback favorable. L'influence du speckle a également été réduite de telle sorte que le capteur mesure jusqu'à la gamme centimétrique pour des cibles non- oopératives. Une nouvelle technique est également présentée, elle permet de rendre le capteur insensible aux vibrations mécaniques parasites qui fausseraient la mesure pour des conditions industrielles
Optical Feedback Interferometry, also known as Self-Mixing, results in compact, selfaligned and contact-less sensors. In this phenomenon, a portion of the laser beam is back reflected from the target and enters the active laser cavity to vary its spectral properties. The laser diode then simultaneously acts as a light source, a micro- nterferometer as well as a light detector. In this thesis, a self-mixing displacement sensor has been optimised so that precise measurement can be obtained in real-time. The sensor is robust to the disappearance of self-mixing fringes for harmonic vibrations. It is also able to auto-adapt itself to a change in the optical feedback regime and so can extract displacement from the weak as well as moderate feedback regime signals. The use of adaptive optics, in the form of a liquid lens, has also been demonstrated for this sensor, which has allowed us to maintain the sensor in a fringe-loss less regime. The influence of speckle has also been reduced so that the sensor can now measure up to the centimetric range for non-cooperative targets. A novel technique has also been presented that makes the sensor insensitive to parasitic mechanical vibrations that would falsify the measurement under industrial conditions
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Pokorný, Aleš. "Bezkontaktní měření otáček ventilátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218589.

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This project is about design of contactless measuring ventilator - revolution counter. The counter serves to measurement of the speed of ventilator. The measurement is based on optical method of receiving the reflected laser beam. To measure and calculate use the revolution counter the microcontroller. This measured value is diplayed on LCD. After design follows experimental measurement.
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Anderson, Thomas Nathan. "The development and application of a diode-laser-based ultraviolet absorption sensor for nitric oxide." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969/112.

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Pradhan, Manik. "Development of a diode-laser based optical sensor for continuous monitoring of trace gases in the atmosphere." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492655.

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The use of continuous wave cavity ring-down spectroscopy (cw-CRDS) in the near-infrared (IR) region has great potential for the design of ultra-sensitive, compact, robust and cost-effective novel optical sensors capable of detecting trace species present in the atmosphere. The research work presented in this thesis focuses on the development and implementation of a fully automated, cryogen-free and compact cw-CRD spectrometer, combined with adsorbent filled dual-trap sample pre-concentration for monitoring trace C2H2 mixing ratios in ambient air.
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Al, Roumy Jalal. "Analysis of the different signal acquisition schemes of an optical feedback based laser diode interferometer." Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0070/document.

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Le phénomène d’interférométrie par réinjection optique se produit lorsqu’une portion de la puissance optique du laser est rétrodiffusée par une cible distante puis réinjectée dans la cavité laser ce qui affecte les propriétés d’émission du laser (fréquence et puissance en particulier). Ce principe résulte alors en un capteur interférométrique compact, auto-aligné et sans contact. Des applications récentes des capteurs par réinjection optique dans les domaines de la microfluidique et de l’acoustique ont montré des résultats prometteurs et ouvert de nouveaux domaines de recherche. Pourtant, dans le cadre de ces applications, l’amplitude du signal est extrêmement faible à cause de la faible amplitude des variations de la puissance rétrodiffusée qui est mesurée. Dans cette thèse, un modèle analytique décrivant la dépendance de l’amplitude du signal issu d’une diode laser monomode au courant d’injection et à la température est développé à partir des équations d’évolution de Lang et Kobayashi. Le modèle a été développé pour toutes les méthodes connues d’acquisition du signal interférométrique par réinjection optique : par la photodiode de monitoring incluse dans le boîtier de la diode laser, par la captation de la puissance optique au moyen d’un photodétecteur externe et par l’amplification de la tension aux bornes de la diode laser elle-même. Le modèle démontre que les signaux des photodiodes et de la tension sont liés à l’efficacité externe de la diode laser, qui elle-même est fonction du courant injecté et de la température. Qui plus est, le modèle prédit une évolution très différente de l’amplitude de ces différents signaux en fonction du courant d’injection ou de la température. Un résultat remarquable, confirmé par une campagne de mesures pour ces trois types de signaux sur une large plage de courants d’injection et de températures. Ainsi ce modèle simple permet une compréhension nouvelle des stratégies de polarisation très différentes de la diode laser permettant d’obtenir une sensibilité optimale du capteur dans les différents schémas d’acquisition du signal. Par ailleurs, les relations entre la phase et l’amplitude des signaux issus des photodiodes externes et de monitoring ont été étudiées sur le plan théorique et expérimental ce qui a permis de révéler des résultats inattendus. À partir du modèle et basé sur des observations expérimentales, une étude critique a été menée sur l’impact de la combinaison des trois signaux dans la stratégie de traitement du signal afin d’améliorer la sensibilité du capteur aux réinjections optiques de faible amplitude
The optical feedback interferometry phenomenon occurs when a portion of the output optical power is back-scattered from a remote target and coupled into the laser cavity to vary the laser’s emission properties (frequency and power mostly). Thus, this scheme results in a compact, self-aligned and contact-less interferometric sensor. Recent applications of optical feedback interferometer in the domains of microfluidics or acoustics have shown promising results and open new fields of researches. However in these applications, the amplitude of the sensing signal is extremely small due to the weakness of the backscattered power changes that are measured. In this thesis, an analytical model that describes the laser injection current and temperature dependence of the optical feedback interferometry signal strength for a single-mode laser diode has been derived from the Lang and Kobayashi rate equations. The model has been developed for all the known signal acquisition methods of the optical feedback interferometry scheme: from the package included monitoring photodiode, by collection of the laser power with an external photodetector and by amplification of the variations in the laser junction voltage. The model shows that both the photodiodes and the voltage signals strengths are related to the laser slope efficiency, which itself is a function of the laser injection current and of the temperature. Moreover, the model predicts different behaviors of the photodiodes and the voltage signal strengths with the change of the laser injection current and the temperature; an important result that has been proven by conducting measurements on all three signals for a wide range of injection current and temperature. Therefore, this simple model provides important insights into the radically different biasing strategies required to achieve optimal sensor sensitivity for the different interferometric signal acquisition schemes. In addition, the phase and amplitude relationships between the external and the in-package photodiode signals have been investigated theoretically and experimentally demonstrating unexpected results. Based on our model and on experimental observations, a critical study has been performed on the impact of the combination of the three signals in the signal processing strategy in order to improve the sensor sensibility to low amplitude optical feedback
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Rodolfo, Barron Jimenez. "Application of an all-solid-state diode-laser-based sensor for carbon monoxide detection by optical absorption in the 4.4 – 4.8 µm spectral region." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1509.

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An all-solid-state continuous-wave (cw) laser system for mid-infrared absorption measurements of the carbon monoxide (CO) molecule has been developed and demonstrated. The single-mode, tunable output of an external-cavity diode laser (ECDL) is difference-frequency mixed (DFM) with the output of a 550-mW diode-pumped cw Nd:YAG laser in a periodically-poled lithium niobate (PPLN) crystal to produce tunable cw radiation in the mid-infrared. The wavelength of the 860-nm ECDL can be coarse tuned between 860.78 to 872.82 nm allowing the sensor to be operated in the 4.4 – 4.8 µm region. Results from single-pass mid-IR direct absorption experiments for CO concentration measurements are discussed. CO measurements were performed in CO/CO2/N2 mixtures in a room temperature gas cell that allowed the evaluation of the sensor operation and data reduction procedures. Field testing was performed at two locations: in the exhaust of a well-stirred reactor (WSR) at Wright-Patterson Air Force Base and the exhaust of a gas turbine at Honeywell Engines and Systems. Field tests demonstrated the feasibility of the sensor for operation in harsh combustion environments but much improvement in the sensor design and operation was required. Experiments in near-adiabatic hydrogen/air CO2-doped flames were performed featuring two-line thermometry in the 4.8 µm spectral region. The sensor concentration measurement uncertainty was estimated at 2% for gas cell testing. CO concentration measurements agreed within 15% of conventional extractive sampling at WSR, and for the flame experiments the repeatability of the peak absorption gives a system uncertainty of 10%. The noise equivalent CO detection limit for these experiments was estimated at 2 ppm per meter, for combustion gas at 1000 K assuming a SNR ratio of 1.
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Books on the topic "Diode laser sensor"

1

Wu, Quan. Development of a sensor to measure CO, H2O concentrations and gas temperature using a 1.56 [mu]m tunable diode laser. Ottawa: National Library of Canada, 2003.

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Iorio, Joanna Maria Di. Development of a sensor to measure gas temperature and carbon monoxide and water concentrations using a 1.58 [mu]m tunable diode laser. Ottawa: National Library of Canada, 2002.

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Hwang, Nam. A dual-frequency diode laser displacement sensor. 1990.

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Hwang, Nam. A dual-frequency diode laser displacement sensor. 1990.

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T, Burnham Geoffrey, and Society of Photo-optical Instrumentation Engineers., eds. Laser diodes and LEDs in industrial, measurement, imaging, and sensors applications II: Testing, packaging, and reliability of semiconductor lasers V : 26-26[sic], January, 2000, San Jose, California. Bellingham, Washington: SPIE, 2000.

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Book chapters on the topic "Diode laser sensor"

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Kersey, A. D., K. J. Williams, A. Dandridge, and J. F. Weller. "Characterization of a Diode Laser-Pumped Nd: YAG Ring Laser for Fiber Sensor Applications." In Springer Proceedings in Physics, 172–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-75088-5_27.

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Li, H., A. Farooq, R. D. Cook, D. F. Davidson, J. B. Jeffries, and R. K. Hanson. "A diode laser absorption sensor for rapid measurements of temperature and water vapor in a shock tube." In Shock Waves, 409–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85168-4_65.

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Allen, Mark G., and Shawn D. Wehe. "Tunable Diode Laser Sensors for Combustion." In Optical Metrology for Fluids, Combustion and Solids, 209–20. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3777-6_7.

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Werle, Peter W. "Diode-Laser Sensors for In-Situ Gas Analysis." In Laser in Environmental and Life Sciences, 223–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08255-3_11.

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Zogg, H., C. Maissen, J. Masek, T. Hoshino, and S. Blunier. "Photovoltaic Infrared Sensor Arrays in Monolithic Lead Chalcogenides on Silicon." In Monitoring of Gaseous Pollutants by Tunable Diode Lasers, 147. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2763-9_24.

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Sachse, G. W., and G. F. Hill. "Aircraft-Based Sensor for Fast Response Measurements of Atmospheric Trace Gases." In Monitoring of Gaseous Pollutants by Tunable Diode Lasers, 68–69. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3991-2_10.

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Charbonnier, F., M. Nerozzi, M. Le Liboux, D. Fournier, and A. C. Boccara. "Laser Diodes and Optical Fibers: Two New Approaches for Mirage Detection Sensors." In Photoacoustic and Photothermal Phenomena, 481–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-540-48181-2_128.

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Chang, Po-Hsiung, Jiun-Ming Li, Boo Cheong Khoo, Lei Li, Jie Ming Teh, and Chiang Juay Teo. "Design and Measurement of Injection Gas Concertation in Rotating Detonation Engines via Diode Laser Sensors." In 31st International Symposium on Shock Waves 2, 139–46. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91017-8_17.

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Zhang Cao and Lijun Xu. "Tunable diode Laser absorption spectroscopy (TDLAS) sensors." In Imaging Sensor Technologies and Applications, 153–92. Institution of Engineering and Technology, 2020. http://dx.doi.org/10.1049/pbce116e_ch5.

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Abou-Zeid, A., and P. Wiese. "A Novel Surface Topography Sensor in the nm Range Based on a Non-Counting Diode Laser Interferometer." In International Progress in Precision Engineering, 518–29. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-7506-9484-1.50061-0.

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Conference papers on the topic "Diode laser sensor"

1

Seshamani, Ramani. "Diode-laser-based range sensor." In Orlando '91, Orlando, FL, edited by Firooz A. Sadjadi. SPIE, 1991. http://dx.doi.org/10.1117/12.44892.

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Lemmetti, Juha, Niklas Sorri, Ilkka Kallioniemi, Petri Melanen, and Petteri Uusimaa. "Long-range all-solid-state flash LiDAR sensor for autonomous driving." In High-Power Diode Laser Technology XIX, edited by Mark S. Zediker. SPIE, 2021. http://dx.doi.org/10.1117/12.2578769.

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Miller, N. C., and K. P. Rispoli. "Electron Beam Induced Luminescence." In ISTFA 2002. ASM International, 2002. http://dx.doi.org/10.31399/asm.cp.istfa2002p0435.

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Abstract A method to detect defects affecting laser diode radiation has been devised by imaging the induced luminescence resulting from a scanning electron beam. Electron Beam Induced Luminescence (EBIL) involves imaging the current from a sensor diode as the SEM electron beam scans across the laser diode surface. Defects preventing laser diode radiation will be shown as contrast variations in the EBIL image. This technique is similar to electron beam induced current (EBIC), reference 1, in which the electron beam provides the capability for measuring subsurface electrical and physical parameters that effect device electrical performance. However in the case of EBIL, laser diode radiation is utilized as the imaging parameter providing direct correlation between the semiconductor active layer and the resultant diode luminescence output. Alternative techniques such as Cathode Luminescence (CL), reference 2 and 5, in the scanning electron microscope (SEM) have been used for examination of semiconductor laser diodes for defects preventing radiation. However CL SEM analysis requires costly accessories, including at least an ellipsoidal mirror and a cooled photomultiplier tube sensitive to the particular laser diode output frequency. In addition the laser diode must be at the focal point of an ellipsoidal mirror, making CL SEM examination of a packaged laser diode difficult or impossible. This paper will describe the EBIL technique using several test diodes to demonstrate the ability of EBIL to image diode luminescence and defects affecting luminescent output. Deprocessing of the laser diode top electrode and EBIL operating parameters will be discussed.
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Huang, Huijie, Yongkai Zhao, Ren Bingqiang, Longlong Du, Zhaogu Cheng, and Dunwu Lu. "Laser-diode-based optical sensor for laser particle counter." In International Symposium on Photonics and Applications, edited by Yakov S. Sidorin and Ding Y. Tang. SPIE, 2001. http://dx.doi.org/10.1117/12.446633.

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Reich, Alton, James Shaw, and John Bergmans. "Testing a Tunable Diode Laser Absorption Spectroscopy Oxygen Analyzer." In ASME 2021 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/pvp2021-61691.

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Abstract Chemical processing systems can be controlled using a wide variety of instrumentation. Often pressure and temperature are key parameters that are monitored and controlled, and this instrumentation is extremely mature technology. In some cases, chemical concentrations are a key process parameter that must be monitored and used as an input to the system controller. Chemical concentrations may be monitored indirectly through pH or conductivity. Direct measurements are often made via electrochemical cells, but these tend to have slow response times. For chemical processes that operate in batch mode, particularly ones that have relatively short cycle times, chemical sensors that have fast response and recovery times are needed, and electrochemical sensors may not be suitable. This paper describes such an application where the chemical concentration of oxygen is an important process and safety parameter. A Tunable Diode Laser Absorption Spectroscopy (TDLAS) oxygen sensor was selected for this application because of the short response and recovery time. When the oxygen sensor was received, it was set up in the laboratory and tested to verify measurement accuracy and data communication with the sensor. During this testing, we discovered that the sensor produced incorrect output over a portion of the system operating pressure range. The root cause of the error was traced to how the firmware (sensor operating software) handled the measured pressure input to produce the oxygen concentration output. The paper discusses the laboratory testing setup, and the testing that was executed. A structured test program was executed that enabled us to understand the nature of the incorrect measurement, and trace the source of the error to the sensor operating software.
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Seshamani, Ramani, K. Vijaya, and T. K. Alex. "A range sensor based on a laser diode." In OE/LASE '92, edited by Richard J. Becherer. SPIE, 1992. http://dx.doi.org/10.1117/12.59218.

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Sakai, Y., H. Kitajima, and T. Yamashita. "Micro object detecting sensor using a laser diode." In ICALEO® ‘89: Proceedings of the Optical Sensing & Measurement Conference. Laser Institute of America, 1989. http://dx.doi.org/10.2351/1.5058343.

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Michau, Vincent, Gerard Rousset, Francis Mendez, and Bernard Riou. "Hartmann-Shack Wavefront Sensor For Laser Diode Testing." In 1989 Intl Congress on Optical Science and Engineering, edited by Georges Otrio. SPIE, 1989. http://dx.doi.org/10.1117/12.961543.

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Wilson, Geoffrey A., and Richard K. DeFreez. "Multispectral-diode-laser-induced fluorescence biological particle sensor." In European Symposium on Optics and Photonics for Defence and Security, edited by John C. Carrano and Arturas Zukauskas. SPIE, 2004. http://dx.doi.org/10.1117/12.578854.

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Verma, R., S. Neethu, S. S. Kamble, J. K. Radhakrishnan, P. P. Krishnapur, and V. C. Padki. "Tunable Diode Laser Absorption Spectroscopy based Oxygen Sensor." In 2012 Sixth International Conference on Sensing Technology (ICST 2012). IEEE, 2012. http://dx.doi.org/10.1109/icsenst.2012.6461655.

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Reports on the topic "Diode laser sensor"

1

O'Byrne, Sean, S. Wittig, J. Kurtz, Y. Krishna, C. Rodriguez, M. Aizengendler, and J. Davies. Diode Laser Sensor for Scramjet Inlets. Fort Belvoir, VA: Defense Technical Information Center, June 2011. http://dx.doi.org/10.21236/ada544361.

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VonDrasek, William, and Anna Melsio-Pubill. Tunable Diode Laser Sensor for Monitoring and Control of Harsh Combustion Environments. Office of Scientific and Technical Information (OSTI), May 2006. http://dx.doi.org/10.2172/882872.

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Goldstein, N., J. Lee, and F. Bien. Automated remote monitoring of toxic gases with diode-laser-based sensor systems. Office of Scientific and Technical Information (OSTI), December 1993. http://dx.doi.org/10.2172/10118145.

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Goldstein, N., J. Lee, S. M. Adler-Golden, and F. Bien. Diode laser-based sensor system for long-path absorption measurements of atmospheric concentration and near-IR molecular spectral parameters. Office of Scientific and Technical Information (OSTI), December 1993. http://dx.doi.org/10.2172/10118156.

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Hanson, R. K. Next Generation Diode Lasers for Wavelength Multiplexed Propulsion Sensors. Fort Belvoir, VA: Defense Technical Information Center, September 2002. http://dx.doi.org/10.21236/ada408659.

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Hanson, Ronald, and Kevin Whitty. Tunable Diode Laser Sensors to Monitor Temperature and Gas Composition in High-Temperature Coal Gasifiers. Office of Scientific and Technical Information (OSTI), December 2014. http://dx.doi.org/10.2172/1222583.

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George P. Miller. An Optical Offgas Sensor Network Incorporating a HG Cavity Ringdown Spectrometer and IR Diode Lasers. Office of Scientific and Technical Information (OSTI), December 2007. http://dx.doi.org/10.2172/928989.

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