Готові списки джерел за темами / Fiber optic instrument

Добірка наукової літератури з теми "Fiber optic instrument"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Fiber optic instrument"

1

Merrill, Raymond. "Fiber optic musical instrument digital interface." Journal of the Acoustical Society of America 89, no. 5 (May 1991): 2485. http://dx.doi.org/10.1121/1.400862.

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2

Su, Liang Yu. "LabVIEW Applications for Fiber-Optic Remote Test and Fiber Sensor Systems." Applied Mechanics and Materials 610 (August 2014): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amm.610.216.

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This paper demonstrates applications of LabVIEW in automatic test measurement of fiber optic system.First,the LabVIEW applications in fiber optic system and the basics of instrument connectivity are presented.Then,the aspects of hardware communication to external instruments through GPIB and serial interfaces are analyzed.Next,self-calibrating automated characterization system for depressed cladding applications is demonstrated utilizing the LabVIEW’s GPIB interface. Results of the manual and automatic measurements and the analysis of the measurement trace obtained from the optical time domain reflectometer (OTDR) are shown.In the end,two applications of LabVIEW in fiber optic sensor system are discussed.
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3

Phillips, Brennan T., Nicholas Chaloux, Russell Shomberg, Adriana Muñoz-Soto, and Jim Owens. "The Fiber Optic Reel System: A Compact Deployment Solution for Tethered Live-Telemetry Deep-Sea Robots and Sensors." Sensors 21, no. 7 (April 4, 2021): 2526. http://dx.doi.org/10.3390/s21072526.

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Tethered deep-sea robots and instrument platforms, such as Remotely Operated Vehicles (ROVs) and vertical-profiling or towed instrument arrays, commonly rely on fiber optics for real-time data transmission. Fiber optic tethers used for these applications are either heavily reinforced load-bearing cables used to support lifting and pulling, or bare optical fibers used in non-load bearing applications. Load-bearing tethers directly scale operations for deep-sea robots as the cable diameter, mass, and length typically require heavy winches and large surface support vessels to operate, and also guide the design of the deep-sea robot itself. In an effort to dramatically reduce the physical scale and operational overhead of tethered live-telemetry deep-sea robots and sensors, we have developed the Fiber Optic Reel System (FOReelS). FOReelS utilizes a customized electric fishing reel outfitted with a proprietary hollow-core braided fiber optic fishing line and mechanical termination assembly (FOFL), which offers an extremely small diameter (750 μm) load-bearing (90 lb/400 N breaking strength) tether to support live high-bandwidth data transmission as well as fiber optic sensing applications. The system incorporates a novel epoxy potted data payload system (DPS) that includes high-definition video, integrated lighting, rechargeable battery power, and gigabit ethernet fiber optic telemetry. In this paper we present the complete FOReelS design and field demonstrations to depths exceeding 780 m using small coastal support vessels of opportunity. FOReelS is likely the smallest form factor live-telemetry deep-sea exploration tool currently in existence, with a broad range of future applications envisioned for oceanographic sensing and communication.
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4

Andreev, A., G. Diankov, B. Zafirova, and A. Kebedjiev. "Wavelength-demultiplexed fiber-optic temperature-measurement instrument." Sensors and Actuators A: Physical 30, no. 3 (February 1992): 215–18. http://dx.doi.org/10.1016/0924-4247(92)80123-k.

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5

Sum, Stephen T., and Steven D. Brown. "Standardization of Fiber-Optic Probes for Near-Infrared Multivariate Calibrations." Applied Spectroscopy 52, no. 6 (June 1998): 869–77. http://dx.doi.org/10.1366/0003702981944418.

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The standardization of Fourier transform near-infrared (FT-NIR) spectrometers equipped with fiber-optic probes was investigated. FT-NIR spectra of caustic brines for an industrial process were measured on two different instruments. Calibration transfer across the instruments and probes was studied by employing calibration models built on one instrument to predict properties from spectra measured on the other. The transfer was examined by using spectra without and with preprocessing. The preprocessing methods included a Savitzky–Golay (SG) derivative polynomial filter, a procedure based on a finite impulse response (FIR) filter, and a combination of both. In addition to being a preprocessing technique, the FIR filter is also a standardization method that transforms the instrument response function of one instrument to match that of another. The transformation is performed over a moving processing window without the use of transfer standards. In this study, application of the FIR filter to first-derivative spectra provided the best multivariate calibration models and led to the successful transfer of calibration across different probes and spectrometers.
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6

Bright, Frank V. "A New Fiber-Optic-Based Multifrequency Phase-Modulation Fluorometer." Applied Spectroscopy 42, no. 8 (November 1988): 1531–37. http://dx.doi.org/10.1366/0003702884429580.

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A new fiber-optic-based fluorescence lifetime instrument is described which is useful for the study of complex fluorescence decay kinetics. The new instrument consists of a multifrequency phase fluorometer coupled to a fiber-optic probe. To demonstrate the power of the new instrument, we show results for the unequivocal resolution of single, double, and triple exponential decays of fluorescence. In addition, spectral coverage in the ultraviolet and visible regions is possible, and lifetimes from approximately 200 ns to 150 ps are easily determined for samples as dilute as 0.1 μM.
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7

Victor, Mark A., and Stanley R. Crouch. "Absorbance-Corrected Synchronous Fluorescence with a Fiber-Optic-Based Fluorometer." Applied Spectroscopy 49, no. 7 (July 1995): 1041–47. http://dx.doi.org/10.1366/0003702953964778.

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Synchronous fluorescence spectroscopy is frequently used to resolve multiple components in mixtures without separation. However, uncompensated inner-filter effects can lead to unexpected and/or large quantitative errors. An instrument and a method that correct for primary and secondary inner-filter effects in synchronous fluorescence spectroscopy have been designed and characterized. A bifurcated fiber-optic-based diode array fluorometer that simultaneously measures front-surface fluorescence and absorbance was constructed. A transfer function that mathematically describes the coupling efficiency between the excitation and emission legs of the fiber optics is defined and characterized. Once characterized, such a fluorometer is capable of calculating what the fluorescence measurement would be in the absence of inner-filter effects. Several experimental procedures for determining the instrument's transfer function are compared and discussed. Applications of the various procedures to experimental fluorescence inner-filter corrections to problematic samples are demonstrated.
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8

Garrido-Varo, Ana, Ana Sánchez-Bonilla, Francisco Maroto-Molina, Cecilia Riccioli, and Dolores Pérez-Marín. "Long-Length Fiber Optic Near-Infrared (NIR) Spectroscopy Probes for On-Line Quality Control of Processed Land Animal Proteins." Applied Spectroscopy 72, no. 8 (June 13, 2018): 1170–82. http://dx.doi.org/10.1177/0003702817752111.

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This research was conducted using a spectral database comprising 346 samples of processed animal proteins (PAPs) with a range of compositions, analyzed using a Fourier transform near-infrared spectroscopy multichannel instrument (Matrix-F, Bruker Optics) coupled to a 100 m fiber optic cable. Using both its static and dynamic operating modes (on a conveyor belt), simulating the movement of the product in the plant, the predictive capabilities of both modes of analysis were assessed and compared, for the purposes of predicting moisture, protein, and ashes. The results show that both exhibit highly similar degrees of precision and accuracy for predicting these parameters. This research provides a foundation of scientific-technical knowledge, hitherto unknown, regarding the “on-line” incorporation of an instrument (equipped with a 100 m fiber optic cable) into a processing plant of by-products of animal origin.
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9

Noyes, R. W., T. M. Brown, S. Horner, S. Korzennik, and P. Nisenson. "The AFOE—A New Instrument for Asteroseismology." International Astronomical Union Colloquium 137 (1993): 752–54. http://dx.doi.org/10.1017/s0252921100018807.

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AbstractWe describe technical aspects and performance characteristics of an Advanced Fiber Optic Spectrograph (AFOE), planned for the Mt. Hopkins 1.5 m telescope for asteroseismology of sun-like stars.
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10

Hausner, Mark B., and Scott Kobs. "Identifying and Correcting Step Losses in Single-Ended Fiber-Optic Distributed Temperature Sensing Data." Journal of Sensors 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/7073619.

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Анотація:
Fiber-optic distributed temperature sensing (DTS) makes it possible to observe temperatures on spatial scales as fine as centimeters and at frequencies up to 1 Hz. Over the past decade, fiber-optic DTS instruments have increasingly been employed to monitor environmental temperatures, from oceans to atmospheric monitoring. Because of the nature of environmental deployments, optical fibers deployed for research purposes often encounter step losses in the Raman spectra signal. Whether these phenomena occur due to cable damage or impingements, sharp bends in the deployed cable, or connections and splices, the step losses are usually not adequately addressed by the calibration routines provided by instrument manufacturers and can be overlooked in postprocessing calibration routines as well. Here we provide a method to identify and correct for the effects of step losses in raw Raman spectra data. The utility of the correction is demonstrated with case studies, including synthetic and laboratory data sets.
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Більше джерел

Дисертації з теми "Fiber optic instrument"

1

Pierce, Mary E. "Engineering a fiber-optic implantable cardiovascular biosensor /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1422954.

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2

Hamner, Vincent N. "A fiber optic polarimeter for use in chemical analysis." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42892.

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Polarimetry, as applied to chemical analysis, deals with the determination of the extent and direction that an optically active chemical species will rotate incident linearly polarized light. Although well developed for physical sensing, the technique of fiber optic polarimetry for chemical sensing remains in its infancy. This thesis is concerned with the design and development of an optical fiber polarimeter which measures the optical rotation of linearly polarized light that occurs in a sensing region between two multi-mode optical fibers. Over short distances, the polarization preserving capabilities of large-core multi-mode optical fibers were investigated. Polarimetric analyses were performed using sucrose and quinine hydrochloride. The instrument has a resolution of O.O8·, and is an excellent platform for an LC or FIA detector. Its more intriguing future lies in evanescent field sensor applications and studies of chiroptical surface interactions.
Master of Science

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3

Sakamoto, João Marcos Salvi. "Laser ultrasonics system with a fiber optic angular displacement sensor." Instituto Tecnológico de Aeronáutica, 2012. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2146.

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Laser ultrasonics is an all-optical non-destructive testing technique which employs ultrasonic waves as a means of ascertaining the internal part of an opaque material (for light). The difference from a conventional ultrasonics testing technique relies on the generation and detection of these waves which, in the laser ultrasonics technique, is performed by a laser pulse and an optical detector of ultrasound, respectively. This technique is employed in the aerospace and aeronautics industry for flaw detection or material characterization, since it is couplant free, non-contact and remote from the inspected object. The high cost and complexity of a commercial laser ultrasonics system, however, led to the development in this work, of an intensity-modulated fiber optic sensor to be employed as the optical detector of a laser ultrasonics system. This fiber optic sensor is capable to detect angular displacement in the range of microradians and presents high sensitivity, optical fiber compatibility, wide bandwidth and, furthermore, is simple to assembly and low cost. The fiber optic sensor comprises two optical fibers, a positive lens, a reflective surface, a laser, and a photodetector. A mathematical model was developed to determine and simulate the static characteristic curve of the sensor and to analyze the influence of geometrical parameters in its performance. Different sensor configurations were assembled and experimental static characteristic curves were acquired to validate the mathematical model. The normalized sensitivity, for the configurations tested, ranges from (0.25×Vmax) to (2.40×Vmax) mV/?rad and the linear range, from 194 to 1840 ?rad. Regarding an specific sensor configuration (the sensor 4/4) with reflective surface of 100% of reflectivity, the sensor presented an unnormalized sensitivity of 7.7 mV/?rad, an estimated resolution of approximately 1 ?rad and signal-to-noise ratio of 32 dB. The sensor was tested on the dynamic operation for sound and ultrasound detection and, finally as the optical detector of the complete laser ultrasonics system developed in this work. The sensor also proved to be suitable for time-of-flight measurements and nondestructive testing, being an alternative to the piezoelectric or the interferometric detectors.
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4

Денисов, Микола Олександрович. "Підвищення ефективності незображуючих волоконно- оптичних систем для мінімально інвазивної клінічної медицини". Doctoral thesis, Київ, 2016. https://ela.kpi.ua/handle/123456789/16317.

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Дисертація присвячена вирішенню наукової проблеми підвищення ефективності незображуючих волоконно-оптичних систем (НВОС) для мінімально інвазивної клінічної медицини. Розроблено узагальнені принципи структурно-функціональної організації незображуючих волоконно-оптичних систем для мінімально інвазивної клінічної медицини, в основі яких лежать узагальнені класифікації НВОС та волоконно- оптичного інструменту (ВОІ); оригінальну математичну модель розповсюдження оптичного випромінювання всередині біотанини та математичну модель флуоресцентного сигналу від неї; нові математичні моделі та технічні рішення побудови оригінальних базових функціональних модулів з оцінюванням і оптимізацією їх ефективності за запропонованими кількісними показниками з метою цілеспрямованого створення діагностичних та лікувальних систем і наступним їх впровадженням у виробництво та клінічну практику.
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5

Biazon, Filho Alcino José. "Nova técnica de malha fechada para estabilização do ponto de operação de interrogadores de sensores com grade de bragg em fibras ópticas." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260881.

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Анотація:
Orientador: José Antonio Siqueira Dias
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-21T18:07:20Z (GMT). No. of bitstreams: 1 BiazonFilho_AlcinoJose_D.pdf: 3212736 bytes, checksum: 5eb7bde925a233493806c588f3c39cfe (MD5) Previous issue date: 2012
Resumo: Sensores de fibra óptica são imunes à interferência eletromagnética (EMI), e são uma excelente escolha para ser usado em ambientes eletricamente ruidosos aplicações em sensoriamento remoto, incluindo aeroespacial, ferroviário equipamentos de segurança militar e em linhas de alta tensão. Outras vantagens incluem o fato de que eles são compactos, leves e os sinais de medição podem ser transmitidos a distâncias muito grandes (da ordem de km). Os interrogadores convencionais para redes de Bragg (FBG) do sensor são equipamentos de custo elevado e não pode ser utilizado em aplicações de baixo custo. Neste trabalho é apresentada uma nova técnica de interrogação robusta e de baixo custo que apresenta uma boa precisão. A técnica, que utiliza um circuito de retroalimentação eletrônico para estabilizar o ponto de operação DC das grades de Bragg, permite a medição simultânea de ambos sinais AC e DC. Um protótipo do interrogador proposto foi projetado e implementado. A técnica exige apenas três componentes ópticos: um laser distribuído, um acoplador óptico e um fotodiodo. O interrogador foi testado com sucesso em uma aplicação de DC (medição de temperatura) e uma aplicação AC (medição de corrente elétrica). Os resultados experimentais mostraram que o controle eletrônico em malha fechada pode controlar o ponto de operação da FBG com uma precisão de ± 2 ppm
Abstract: Fiber optic sensors are immune to electromagnetic interference (EMI), and are an excellent choice for being used in electrically noisy environments sensing applications, including aerospace, rail, military security equipment and in high voltage power lines. Other advantages include the fact that they are compact, lightweight and the measured signals can be transmitted at very large distances (of the order of kilometers). The conventional interrogators for Fiber Bragg Gratings (FBG) sensor are high cost equipment and cannot be used in low cost applications. In this work it is presented a novel robust and low cost interrogation technique that presents good accuracy. The technique, which uses an electronic feedback loop to stabilize the DC operating point of the Bragg gratings, allows the simultaneous measurement of both AC and DC signals. A prototype of the proposed interrogator was designed and implemented. The technique requires only three optical components: a Distributed Feedback Laser, an optical coupler and one photodiode. The interrogator has been successfully tested in a DC application (temperature measurement) and an AC application (electrical current measurement). Experimental results showed that the electronic feedback loop can control the operation point of the FBG with a precision of ±2 ppm
Doutorado
Eletrônica, Microeletrônica e Optoeletrônica
Doutor em Engenharia Elétrica
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6

Jovanovic, N., N. Cvetojevic, C. Schwab, B. Norris, J. Lozi, S. Gross, C. Betters, et al. "Efficiently feeding single-mode fiber photonic spectrographs with an extreme adaptive optics system: on-sky characterization and preliminary spectroscopy." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622807.

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High-order wavefront correction is not only beneficial for high-contrast imaging, but also spectroscopy. The size of a spectrograph can be decoupled from the size of the telescope aperture by moving to the diffraction limit which has strong implications for ELT based instrument design. Here we present the construction and characterization of an extremely efficient single-mode fiber feed behind an extreme adaptive optics system (SCExAO). We show that this feed can indeed be utilized to great success by photonic-based spectrographs. We present metrics to quantify the system performance and some preliminary spectra delivered by the compact spectrograph.
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7

Damin, Craig Anthony. "Instrument Development and Application for Qualitative and Quantitative Sample Analyses Using Infrared and Raman Spectroscopies." Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1385774823.

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8

Martinod, Marc-Antoine. "Développement et exploitation scientifique d’un nouvel instrument interférométrique visible en optique guidée." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4215/document.

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Анотація:
L'interférométrie visible longue base est une technique d'observation en astronomie permettant de sonder les objets avec une résolution spatiale qu'il est impossible d'atteindre avec un télescope seul. La mise en œuvre au sol de cette méthode est limitée en sensibilité et précision de mesure à cause de la turbulence atmosphérique. Or les nouveaux besoins scientifiques, tels que la détermination des paramètres fondamentaux, l'étude de l'environnement proche ou de la surface des étoiles, requièrent la capacité d'observer des objets de moins en moins brillants et de faire des mesures de plus en plus précises, en interférométrie visible. Pour s'affranchir de la turbulence, l'interférométrie multimode a été développée en reprenant le concept de l'interférométrie des tavelures utilisée sur un seul télescope. Aujourd'hui, pour améliorer davantage les performances des futurs instruments, cette instrumentation évolue vers l'utilisation de la nouvelle génération de détecteur, l'Electron Multiplying Charge-Coupled Device (EMCCD), et de l'emploi des fibres optiques interfacées avec des optiques adaptatives. Cette avancée est motivée par le succès de l'utilisation conjointe de l'optique adaptative et du suivi de franges pour s'affranchir partiellement de la turbulence en interférométrie infrarouge, en 2017 avec l'instrument GRAVITY (Gravity Collaboration et al. 2017). Le prototype FRIEND (Fibered and spectrally Resolved Interferometer - New Design) a été conçu pour caractériser et évaluer les performances de la combinaison de ces éléments, dans le domaine visible. L'amélioration de la précision des instruments interférométriques est apportée par les fibres optiques et par la dynamique du signal délivré par une EMCCD. L'inconvénient de l'emploi des fibres dans le visible est une perte de la sensibilité du fait que le taux d'injection du flux dans celles-ci est très faible à cause de la turbulence atmosphérique. Mais il se trouve que l'optique adaptative et l'EMCCD permettent d'améliorer la sensibilité. En effet, l'optique adaptative maximise l'injection en réduisant l'influence de la turbulence atmosphérique, et l'EMCCD est capable de détecteur de faibles flux. FRIEND prépare ainsi le développement du futur instrument SPICA, recombinant jusqu'à six télescopes (Mourard et al. 2017, 2018). Celui-ci devra explorer la stabilisation des interférences grâce au suivi de franges. Cet aspect n'est pas abordé dans cette thèse. Je présente dans cette thèse le prototype FRIEND, capable de recombiner jusqu'à trois télescopes, opérant dans la bande R en franges dispersées. Il est doté de fibres optiques gaussiennes monomodes à maintien de polarisation et d'une EMCCD. Il est installé sur l'interféromètre visible Center for High Angular Resolution Astronomy (CHARA), au Mount Wilson, en Californie, qui est en train de s'équiper d'optiques adaptatives. J'ai développé des estimateurs de visibilité et de clôture de phase, la méthode de réduction des données de ce prototype et une stratégie d'observation. Grâce à ces outils, j'ai montré que les optiques adaptatives améliorent le taux d'injection dans les fibres. Il est alors apparu que la stabilisation de l'injection est importante pour maximiser le rapport signal-à-bruit dans chaque image. La biréfringence des fibres dégrade les performances de l'instrument mais elle a pu être compensée. J'ai montré qu'un instrument, basé sur la conception de FRIEND, permet d'accéder à des mesures de visibilité faibles avec une précision, inatteignable avec la génération actuelle, grâce au développement et l'utilisation d'un modèle de rapport signal-à-bruit. L'instrument a enfin été testé dans son intégralité sur le système binaire connu ζ Ori A. Cette observation montre la fiabilité et la précision des mesures interférométriques obtenues avec ce prototype, montrant l'intérêt de cette association de technologies pour les futurs interféromètres visibles
Long baseline visible interferometry in astronomy is an observing technique which allows to get insights of an object with an outstanding angular resolution, unreachable with single-dish telescope. Interferometric measurements with ground-based instrumentation are currently limited in sensitivity and precision due to atmospheric turbulence. However, the new astrophysical needs, particularly the determination of fundamental parameters or the study of the closed environment and the surface of the stars, require to observe fainter objects with a better precision than now in visible interferometry. Ought to overcome the atmospheric turbulence, multispeckle interferometry has been developed by adapting speckle imaging technics used on single-dish telescope. Today, in order to improve the performance of the future combiners, instrumentation progresses to the use of a new generation detector called EMCCD, and the use of optical fibers which are coupled with adaptive optics. This path is chosen thank to the success of the use of the adaptive optics with the fringe tracking in the infrared interferometry in 2017 (Gravity Collaboration et al. 2017), in order to compensate turbulence. FRIEND prototype (Fibered and spectrally Resolved Interferometer - New Design) has been designed to characterize and estimate the performance of such a combination of technologies, in the visible spectral band. The improvement of the precision of the measurements from interferometric instruments is due to optical fibers and the dynamical range of the EMCCD. The counterpart of using the optical fibers is a loss in sensitivity due to a low injection rate of flux into the fibers because of the atmospheric turbulence. On the other hand, sensitivity is improved thanks to adaptive optics and EMCCDs. Indeed, adaptive optics increases the injection rate and EMCCDs can measure low fluxes. Lastly, FRIEND is a pathfinder for the future instrument SPICA which should recombine up to 6 telescopes (Mourard et al. 2017, 2018). Fringe-tracking aspects will have to be studied for SPICA; this topic is not dealt with in this thesis. In this work, I present the FRIEND prototype, which can recombine up to three telescopes and operates in the R band with dispersed fringes. It has Gaussian polarization-maintaining single mode optical fibers and an EMCCD. It is set up at the Center for High Angular Resolution Astronomy (CHARA), at Mount Wilson, in California. CHARA is currently being equipped with adaptive optics. I develop estimators of visibility modulus and closure phase, the data reduction software and an observing strategy. Thanks to that, I am able to show that adaptive optics improves the injection rate. I also demonstrate how important the stabilization of injection is to maximize the signal-to-noise ratio (SNR) per frame. Birefringence of the fibers decreases the performance of the instrument but we manage to compensate it. I show how such an instrument can measure low visibility with a better precision than now by developing and using a SNR model of FRIEND. Finally, FRIEND has entirely been tested on the known binary system ζ Ori A. These observations demonstrate how reliable and accurate the measurements of FRIEND are
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9

Morana, Adriana. "Gamma-rays and neutrons effects on optical fibers and Bragg gratings for temperature sensors." Phd thesis, Université Jean Monnet - Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-01064993.

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The nuclear industry shows an increasing interest in the fiber optic technology for both data communication and sensing applications in nuclear plants. The optical fibers offer several advantages and the sensors based on this technology do not need any electrical power at the sensing point, they have a quick response and they can be easily multiplexed: in the case of a temperature sensor, several thermocouples can be substituted by a single fiber, resulting in a decrease of the waste material. The fission reactors are a very harsh environment: it is characterized by the highest dose of gamma-rays, of the order of magnitude of GGy, besides a high flux of neutrons and high operating temperature (300°C for the current reactors, known as generation III). This work has been carried out in collaboration with AREVA, a French industrial conglomerate active in the energy domain, with the aim of realizing a temperature sensor resistant to the environment of nuclear reactor of generation IV, in particular a Sodium-cooled Fast Reactor. The currently used technology, the thermocouples, presents a drift of the measurement due to irradiation, that needs a calibration, and a long response time on the order of seconds. In order to remove the drift, to reduce the response time and to increase the precision, a Fiber Bragg Grating temperature sensor was chosen, in regard to all the advantages of the optical fibers. To understand the behavior of such system in a harsh environment, as the nuclear reactor core, we used an experimental approach based on complementary techniques such as radiation-induced attenuation, photoluminescence, electron paramagnetic resonance and Raman spectroscopies
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10

Leite, Rogerio Lara. "Uma contribuição ao estudo e desenvolvimento de sensores de alta tensão baseados em fibras opticas." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260870.

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Orientador: Jose Antonio Siqueira Dias
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-07T11:11:31Z (GMT). No. of bitstreams: 1 Leite_RogerioLara_D.pdf: 18262113 bytes, checksum: 8c49a719bdf98e92810c4c7275e7da78 (MD5) Previous issue date: 2006
Resumo: Os sensores a fibra óptica são especialmente indicados para operarem em ambientes eletricamente ruidosos, uma vez que são imunes aos efeitos da interferência eletromagnética (EMI) encontrados nestes ambientes. Tal característica faz com que os sensores ópticos sejam altamente vantajosos para as aplicações nos sistemas de sensoreamento utilizados pelas empresas de energia elétrica. Este trabalho apresenta o desenvolvimento de um protótipo de baixo custo de um sensor óptico de alta tensão com alta confiabilidade, que pode ser usado para monitorar o estado ou limiares de tensão em uma rede elétrica. Uma técnica de detecção do sinal através do sensoreamento com grades de Bragg é apresentada, fabricada e avaliada. Os resultados mostram que a técnica de detecção empregada, onde a amplitude ac do sinal da luz refletido é medida em um fotodiodo, mostra-se adequada para a aplicação em sensores de alta tensão. As medidas realizadas em um protótipo de sensor de alta tensão com fibra óptica com grade de Bragg indicam que o esquema de detecção desenvolvido é promissor, e pode ser usado para medir outros sinais dinâmicos que respondam a um esforço de pequena amplitude aplicado à fibra óptica. O protótipo desenvolvido permitiu a detecção de tensões variando na faixa de 143 V -60kY. É também apresentada uma nova técnica para estabilizar termicamente grades de Bragg com a temperatura, utilizando o sinal uma fibra extra, casada com a fibra do sensor, que através de um circuito de realimentação atua no elemento aquecedor/resfriador do laser semicondutor(thenno electrical cooler), para fazer com que o comprimento de onda do laser siga as variações da sintonia da grade de Bragg sensora, causadas por variações da temperatura. Esta técnica inovadora poderá ser utilizada para a compensação térmica de outros tipos de sensores com grade de Bragg, permitindo a fabricação de sensores de baixo custo e grande simplicidade de implementação
Abstract: Fiber optics sensors are specially indicated to operate in noisy electrical environments because they are immune to the effects of electromagnetic interference (EM!) found in these environrnents. Such characteristic makes these sensors highly advantageous to the applications in the measurement systems used by electrical energy companies. This work presents the development of a prototype of a high-voltage and a low cost optical sensor which is used to monitor the state or voltage threshold with a high reliability. A technique for the detection of fiber Bragg grating sensors signals was developed, presented and tested. The experimental results showed that the developed detection technique, where the ac amplitude of the signal result from the light reflection is measured with a photodiode is adequate for high voltage sensing applications. The prototype of the high voltage fiber Bragg sensor was tested and the measured results indicate that the technique can be used to detect any other dynarnic measurand which induces a small strain amplitude when applied to the fiber Bragg grating. The developed prototype detected voltages in the range from 143 V to 60 kV. It is also presented a new technique for obtaining temperature independent fiber Bragg gratings, using a feedback circuit which uses the signal detected from a matched fiber and generates a signal which actuates on the thermo electrical cooler of the semiconductor laser, modifying the laser' s output wavelength, in orer to accurate track the Bragg wavelength shifts caused by temperature variations. This novel technique can be used for the fabrication of simple and low-cost temperature compensated fiber Bragg grating sensors
Doutorado
Eletrônica, Microeletrônica e Optoeletrônica
Doutor em Engenharia Elétrica
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Книги з теми "Fiber optic instrument"

1

Weyrauch, Curtis. Fiber optic handpiece illumination systems. Brooks Air Force Base, TX: United States Air Force, School of Aerospace Medicine, 1989.

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2

Cho, Y. C. Fiber-optic interferometric sensors for measurements of pressure fluctuations: Experimental evaluation. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1993.

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Cho, Y. C. Fiber-optic interferometric sensors for measurements of pressure fluctuations: Experimental evaluation. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1993.

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Cho, Y. C. Fiber-optic interferometric sensors for measurements of pressure fluctuations: Experimental evaluation. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1993.

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Cho, Y. C. Fiber-optic interferometric sensors for measurements of pressure fluctuations: Experimental evaluation. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1993.

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6

Karioja, Pentti. Integrated optics for instrumentation applications. Espoo, Finland: VTT, Technical Research Centre of Finland, 1996.

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7

Fiberoptic guided tracheal intubation: A practical approach. Singapore: McGraw-Hill Book Co., 1995.

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8

Teare, Scott W. Introduction to image stabilization. Bellingham, Wash: SPIE Press, 2006.

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9

Organisation), International Conference on Microelectronics &. Fiber Optics (1985 Central Scientific Instruments. Microelectronics and photonics: Proceedings of the International Conference on Microelectronics & Fiber Optics held at Central Scientific Instruments Organisation, Chandigarh, India. New Delhi, India: Siddharth Publications, 1987.

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10

Adamovsky, Grigory. Detection, evaluation, and optimization of optical signals generated by fiber optic bragg gratings under dynamic excitations. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Частини книг з теми "Fiber optic instrument"

1

Koshevoy, N. D., O. V. Zabolotnyi, I. I. Koshevaya, V. V. Muratov, and T. G. Rozhnova. "Fiber-Optic Pressure Instrument Transducers." In Integrated Computer Technologies in Mechanical Engineering, 11–23. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37618-5_2.

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2

Ye, Lijun, Fucheng Liu, Yinhe Chen, Liliang Li, and Hexi Baoyin. "A Method to Determine the Rate Random Walk Coefficient of Fiber Optic Gyroscope." In 6th International Symposium of Space Optical Instruments and Applications, 121–31. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-56488-9_11.

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3

Mahadi, Nur Hidayah, and Hisham Mohamad. "Interpretation Method of Distributed Fibre Optic Strain Sensor in Instrumented Static Pile Load Test." In Lecture Notes in Civil Engineering, 772–78. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6311-3_88.

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4

Tioh, Jin, Mani Mina, Robert Weber, and Arun Somani. "Fiber-Optic Network Components." In Instrument Engineers' Handbook, 525–45. CRC Press, 2011. http://dx.doi.org/10.1201/b11093-39.

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Maier, Martin. "Fiber-Optic Communications and Networks." In Instrument Engineers' Handbook, 546–64. CRC Press, 2011. http://dx.doi.org/10.1201/b11093-40.

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"Fiber-Optic Network Components." In Instrument Engineers' Handbook, Volume 3, 585–605. CRC Press, 2018. http://dx.doi.org/10.1201/9781315217093-39.

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"Fiber-Optic Communications and Networks." In Instrument Engineers' Handbook, Volume 3, 606–24. CRC Press, 2018. http://dx.doi.org/10.1201/9781315217093-40.

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Hatfield, Adrian R. W. "Upper gastrointestinal endoscopy." In Oxford Textbook of Medicine, 2214–19. Oxford University Press, 2010. http://dx.doi.org/10.1093/med/9780199204854.003.150302.

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Flexible fibre optic endoscopes were developed in the mid-1960s, leading to the growth of gastrointestinal endoscopy as we now know it. The recent availability of cheaper, miniaturized colour chips has led to the development of video endoscopes, providing an excellent clear view that does not deteriorate with age (as it does with fibre optic devices). With improvements in software, the endoscopic video image can be magnified: modern instruments will zoom up to 25 × magnification, and mucosal detail can also be enhanced electronically so that small lesions a few millimetres in size can be seen quite clearly. The modern video endoscope image can be instantly printed out and archived digitally on a computer system....
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Bag, Sandip. "Overview of Surgical Instruments for the Operation Theatre." In Advances in Medical Technologies and Clinical Practice, 23–56. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-4969-7.ch002.

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There are several classes of surgical instruments such as graspers, clamps, and occluders for blood vessels and other organs; retractors used to spread open skin, ribs, and other tissue; distractors, positioners, and stereotactic devices; mechanical cutters (scalpels, lancets, surgical scissors, etc.); dilators and specula for access to narrow passages or incisions; suction tips and tubes for removal of bodily fluids; sealing devices such as surgical staplers; irrigation and injection needles, tips, and tubes for introducing fluid; powered devices, such as drills, dermatomes; scopes and probes, including fiber optic endoscopes and tactile probes; carriers and appliers for optical, electronic, and mechanical devices; ultrasound tissue disruptors, cryotomes, and cutting laser guides; measurement devices, such as rulers and calipers; and many more. This chapter overviews surgical instruments for the operation theatre.
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Тези доповідей конференцій з теми "Fiber optic instrument"

1

Wang, Zhiyu, Wenling Huang, Lei Tang, Bo Zhou, Yugi Li, and Jun He. "Novel fiber optic immunosensor instrument." In Photonics China '96, edited by Kim D. Bennett, Byoung Yoon Kim, and Yanbiao Liao. SPIE, 1996. http://dx.doi.org/10.1117/12.252199.

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2

Graindorge, Philippe, Bernard Laloux, Marc Girault, Philippe Martin, Herve C. Lefevre, and Francois X. Desforges. "Metricor 2000: a multiparameter fiber optic sensor instrument." In SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Ramon P. DePaula and John W. Berthold III. SPIE, 1996. http://dx.doi.org/10.1117/12.255342.

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Flanegan, Mark C. "Fiber optic system on NASA GLAS spaceflight instrument." In International Symposium on Remote Sensing, edited by Francis Berghmans and Edward W. Taylor. SPIE, 2002. http://dx.doi.org/10.1117/12.454380.

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4

Zhao, Limin, Yuling Ma, and Meng Wang. "Research of double matched fiber optic grating demodulation system." In International Conference of Optical Instrument and Technology, edited by Xuping Zhang, Wojtek J. Bock, Xiaoyi Bao, and Ping Shum. SPIE, 2008. http://dx.doi.org/10.1117/12.806592.

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5

Domanski, A., W. Ejchart, J. Jedrzejewski, R. M. Siegoczynski, and W. Tlaczala. "The Fiber-Optic Instrument For Extremely Small Roughness Measurement." In Optical Fibres and Their Applications, edited by Ryszard S. Romaniuk and Mieczyslaw Szustakowski. SPIE, 1986. http://dx.doi.org/10.1117/12.938978.

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Lv, Wenlei, Meng Pang, Qingping Shi, Min Zhang, Yanbiao Liao, Libo Yuan, and Chong Kang. "Study on a fiber optic gradient hydrophone based on interferometer." In International Conference of Optical Instrument and Technology, edited by Yunlong Sheng, Yongtian Wang, and Lijiang Zeng. SPIE, 2008. http://dx.doi.org/10.1117/12.805496.

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Huang, Wencai, Xiulin Wang, Benrui Zheng, Huiying Xu, and Zhiping Cai. "A high-stability single-pumped L-band superfluorescent fiber source for the fiber optic gyroscope." In International Conference of Optical Instrument and Technology, edited by Anbo Wang, YanBiao Liao, AiGuo Song, Yukihiro Ishii, and Xudong Fan. SPIE, 2008. http://dx.doi.org/10.1117/12.811163.

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Song, Cheol, Peter L. Gehlbach, and Jin U. Kang. "Ball lens fiber optic sensor based smart handheld microsurgical instrument." In SPIE BiOS, edited by Israel Gannot. SPIE, 2013. http://dx.doi.org/10.1117/12.2004947.

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9

Gallo, Daniele, Carmine Landi, and Mario Luiso. "Electronic instrument transducer for MV networks with fiber optic insulation." In 2011 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2011. http://dx.doi.org/10.1109/imtc.2011.5944136.

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10

Flanegan, Mark C. "Geoscience Laser Altimeter System (GLAS) spaceflight instrument fiber optic system." In Information Technologies 2000, edited by Michel J. F. Digonnet, Osman S. Gebizlioglu, Roger A. Greenwell, Dennis N. Horwitz, and Dilip K. Paul. SPIE, 2001. http://dx.doi.org/10.1117/12.414116.

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