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Journal articles on the topic 'Non-imaging fiber optic system'

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Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Michael Angel, S., H. Trey Skinner, and Brian J. Marquardt. "Imaging Spectroscopy Using Fiber Optics." Microscopy and Microanalysis 3, S2 (August 1997): 845–46. http://dx.doi.org/10.1017/s1431927600011119.

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Optical fiber probes are routinely used with optical spectrometers to allow measurements to be made on remotely located samples. In most of these systems, however, the optical fibers are used as non-imaging “light pipes” for the transmission of laser light, and luminescence or Raman signals to and from the sample. Thus, while these systems are suitable for remote spectroscopy, they are limited to single-point measurements. In a recent paper, we showed that a small-diameter (i.e., 350 μm) coherent optical fiber bundle can be combined with an AOTF-based imaging spectrometer for fluorescence and Raman spectral micro-imaging with increased flexibility in terms of sample positioning and in-situ capabilities. The previous paper described the operation of the fiber-optic microimaging probe and AOTF imaging system and showed preliminary Raman and fluorescence images for model compounds with 4 μm resolution. We have extended this work to include a discussion of the lateral and vertical spatial resolution of the fiber-optic microprobe in a non-contact proximity-focused configuration.

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2

Chen, Lujie, Viswanath Bavigadda, Theodoros Kofidis, and Robert D. Howe. "Fiber Optic Projection-Imaging System for Shape Measurement in Confined Space." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/206569.

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A fiber-based projection-imaging system is proposed for shape measurement in confined space. Owing to the flexibility of imaging fibers, the system can be used in special scenarios that are difficult for conventional experimental setups. Three experiments: open space, closed space, and underwater are designed to demonstrate the strength and weakness of the system. It is shown that when proper alignment is possible, relatively high accuracy can be achieved; the error is less than 2% of the overall height of a specimen. In situations where alignment is difficult, significantly increased error is observed. The error is in the form of gross-scale geometrical distortion; for example, flat surface is reconstructed with curvature. In addition, the imaging fibers may introduce fine-scale noise into phase measurement, which has to be suppressed by smoothing filters. Based on results and analysis, it is found that although a fiber-based system has its unique strength, existing calibration and processing methods for fringe patterns have to be modified to overcome its drawbacks so as to accommodate wider applications.

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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

Fedotov, M. Yu, O. N. Budadin, and S. O. Kozel’skaya. "TECHNOLOGICAL ASPECTS OF CREATING A FIBER-OPTIC NON-DESTRUCTIVE TESTING OF SANDWICH COMPOSITE STRUCTURES." Kontrol'. Diagnostika, no. 253 (July 2019): 24–29. http://dx.doi.org/10.14489/td.2019.07.pp.024-029.

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The results of research on the formation of the system of built-in non-destructive testing of linings of composite three-layer structures by an optical method using fiber-optic sensors based on fiber Bragg gratings are presented. The features of creating an input/output zone for fiber-optic sensors as applied to three-layer composite structures are studied. Recommendations for ensuring the integrity and optimal functioning of the fiber-optic monitoring system as applied to a real three-layer composite structure are formulated. The following is shown. The process of creating an integrated control system of three-layer composite structures by an optical method using integrated fiber-optic sensors includes a number of operations to form a topology and to ensure the output of fiber-optic sensors from composite claddings in a single technological cycle of manufacturing the structure according to the standard technological process without significantly adjusting it, which is extremely important in relation to serial technologies. When developing the technology of integrating fiber-optic sensors into a three-layer composite structure, it was experimentally shown that from the point of view of survivability and preservation of the efficiency of the embedded control system, it is necessary to fulfill a number of requirements for the placement and output of fiber-optic sensors taking into account the characteristics of manufacturing, machining, and operation designs. Thus, it is advisable to place fiber optic sensors in the casings at least 5 mm from the intended edge of the structure, at least 2 layers from the outer surface of the structure and not less than 5 layers from the honeycomb core. The fiber bend radius should be at least 30 mm to prevent mechanical burst and sharp bending of the signal when it is bending. Fiber optic sensors are recommended to be placed between layers with a reinforcement scheme in the direction of the fiber optic sensor, however placement is also allowed between the fiber sensors and one layer with a different direction of reinforcement, while in order to prevent fractures, computation fiber optic sensors overlap is unacceptable, thus, between crossover fiber-optic sensors must be at least 2 layers of prepreg.

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5

Moreau, Frédérick, Sandrine M. Moreau, Dennis M. Hueber, and Tuan Vo-Dinh. "Fiber-Optic Remote Multisensor System Based on an Acousto-Optic Tunable Filter (AOTF)." Applied Spectroscopy 50, no. 10 (October 1996): 1295–300. http://dx.doi.org/10.1366/0003702963904917.

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This paper describes a new fiber-optic multisensor based on an acousto-optic tunable filter (AOTF) and capable of remote sensing using a multioptical fiber array (MOFA). A two-dimensional charge-coupled device (CCD) was used as a detector, and the AOTF was used as a wavelength selector. Unlike a tunable grating or prism-based monochromator, an AOTF has no moving parts, and an AOTF can be rapidly tuned to any wavelength in its operating range within microseconds. The large aperture of the AOTF allows the optical signal from over 100 fiber-optic sensors to be measured simultaneously. These characteristics, combined with their small size, make AOTFs an important new alternative to conventional monochromators, especially for spectral multisensing and imaging. A prototype fiber-optic multisensor system has been developed, and its feasibility for simultaneous detection of molecular luminescence signal via fiber-optic probes is demonstrated.

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6

Zheng, Tian-xiang, Guang-yue Shen, Zhao-hui Li, E. Wu, Xiu-liang Chen, and Guang Wu. "Single-photon imaging system with a fiber optic taper." Optoelectronics Letters 14, no. 4 (July 2018): 267–70. http://dx.doi.org/10.1007/s11801-018-8024-y.

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7

Fedotov, M. Yu, O. N. Budadin, and S. O. Kozelskaya. "THE DEVELOPMENT OF OPTICAL TESTING TECHNOLOGY OF PCM STRUCTURES BY FIBER-OPTIC SENSORS." Kontrol'. Diagnostika, no. 256 (2019): 26–35. http://dx.doi.org/10.14489/td.2019.10.pp.026-035.

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The ways of development of optical control technology of polymer composite materials structures by fiber-optic sensors during production and operation are described and investigated. A mathematical model describing the process of PCM monitoring using fiber optic sensors based on fiber Bragg gratings, clarifying the parameters of a mathematical model by experimentally determining the sensitivity coefficient of fiber optic sensors integrated in PCM, makes it possible to reduce the error in measuring strain by 5 – 7 times. The interaction in the system fiber-optic sensors – PCM and found that the integration of fiber-optic sensors based on quartz fibers in PCM, there is a partial destruction of the protective acrylate shell, which leads to the effect of microslip, which does not significantly affect the quality of measurements and can be compensated for by calibration. The requirements for the placement of fiber-optic sensors in the PCM at the manufacturing stage, including the formation of the input / output zone are formulated. The technology of optical non-destructive testing of composite materials with fiber-optic sensors is described, taking into account the features of the interaction of fiber-optic sensors with composite structures.

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8

Placzek, Fabian, Eliana Cordero Bautista, Simon Kretschmer, Lara M. Wurster, Florian Knorr, Gerardo González-Cerdas, Mikael T. Erkkilä, et al. "Morpho-molecular ex vivo detection and grading of non-muscle-invasive bladder cancer using forward imaging probe based multimodal optical coherence tomography and Raman spectroscopy." Analyst 145, no. 4 (2020): 1445–56. http://dx.doi.org/10.1039/c9an01911a.

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Characterization of bladder biopsies, using a combined fiber optic probe-based optical coherence tomography and Raman spectroscopy imaging system that allows a large field-of-view imaging and detection and grading of cancerous bladder lesions.

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9

Li, Wenxian, Chengshan Han, Congjun Wu, Yawei Huang, and Hang Zhang. "Research on the Coupled Modulation Transfer Function of the Discrete Sampling System with Hexagonal Fiber-Optic Imaging Bundles." Applied Sciences 12, no. 6 (March 18, 2022): 3135. http://dx.doi.org/10.3390/app12063135.

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In this study, we developed a numerical model of the coupled modulation transfer function (coupled-MTF) based on the discrete sampling system from the perspective of optical system imaging quality evaluation for coupled two-dimensional discrete sampling characteristics of the hexagonally aligned fiber-optic imaging bundles and CCD image elements. The results show that when the spatial frequency of the input target signal deviates from the Nyquist frequency by 1%, an increase in the number of fibers leads to a faster convergence of the oscillation of the coupled-MTF, and the coupled-MTF converges to a stable value when the number of fibers reaches 1000 × 1000. The deviation of the spatial frequency of the input target signal from the Nyquist frequency is within 1%, and the oscillatory convergence of the coupled-MTF accelerates with increasing deviation. The coupled-MTF oscillates with the deviation period of the wave peak of the input target signal from the initial position of the fiber center, and the theoretical oscillation spatial period is twice the fiber diameter. This study produces important guidelines for the selection of the number of fibers, input spatial frequency, and initial position deviation of the hexagonally arranged fiber imaging bundles.

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10

Wong, J. W., W. R. Binns, A. Y. Cheng, J. W. Epstein, and J. Klarmann. "A second generation high resolution fiber-optic radiotherapy imaging system." International Journal of Radiation Oncology*Biology*Physics 21 (January 1991): 124. http://dx.doi.org/10.1016/0360-3016(91)90450-i.

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11

Richards, Karl T., Randall H. Buchwald, Donald R. Jansta, and Robert R. Lijewski. "5273041 Fiber optic photoplethysmograph for a magnetic resonance imaging system." Magnetic Resonance Imaging 12, no. 5 (January 1994): XXXVI. http://dx.doi.org/10.1016/0730-725x(94)92343-4.

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12

Mehta, Amit D., Juergen C. Jung, Benjamin A. Flusberg, and Mark J. Schnitzer. "Fiber optic in vivo imaging in the mammalian nervous system." Current Opinion in Neurobiology 14, no. 5 (October 2004): 617–28. http://dx.doi.org/10.1016/j.conb.2004.08.017.

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13

Peng, Xing, and Lingbao Kong. "Design of a real-time fiber-optic infrared imaging system with wide-angle and large depth of field." Chinese Optics Letters 20, no. 1 (2022): 011201. http://dx.doi.org/10.3788/col202220.011201.

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14

Memis, Omer Gokalp, Yigitcan Eryaman, Orhan Aytur, and Ergin Atalar. "Miniaturized fiber-optic transmission system for MRI signals." Magnetic Resonance in Medicine 59, no. 1 (2007): 165–73. http://dx.doi.org/10.1002/mrm.21462.

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15

Keahey, Pelham, Preetha Ramalingam, Kathleen Schmeler, and Rebecca R. Richards-Kortum. "Differential structured illumination microendoscopy for in vivo imaging of molecular contrast agents." Proceedings of the National Academy of Sciences 113, no. 39 (September 12, 2016): 10769–73. http://dx.doi.org/10.1073/pnas.1613497113.

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Fiber optic microendoscopy has shown promise for visualization of molecular contrast agents used to study disease in vivo. However, fiber optic microendoscopes have limited optical sectioning capability, and image contrast is limited by out-of-focus light generated in highly scattering tissue. Optical sectioning techniques have been used in microendoscopes to remove out-of-focus light but reduce imaging speed or rely on bulky optical elements that prevent in vivo imaging. Here, we present differential structured illumination microendoscopy (DSIMe), a fiber optic system that can perform structured illumination in real time for optical sectioning without any opto-mechanical components attached to the distal tip of the fiber bundle. We demonstrate the use of DSIMe during in vivo fluorescence imaging in patients undergoing surgery for cervical adenocarcinoma in situ. Images acquired using DSIMe show greater contrast than standard microendoscopy, improving the ability to detect cellular atypia associated with neoplasia.

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16

Valenti, Denise A. "Alzheimer's Disease and Glaucoma: Imaging the Biomarkers of Neurodegenerative Disease." International Journal of Alzheimer's Disease 2010 (2010): 1–9. http://dx.doi.org/10.4061/2010/793931.

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Imaging through the visual system in Alzheimer's disease, with the technology currently in widespread use for the diagnosis and management of eye disease such as glaucoma and macular degeneration, is proving to be promising. In vivo cross-section imaging during an annual comprehensive eye exam has been available for a decade for glaucoma and macular degeneration, and this same imaging, using Optical Coherence Tomography, has been demonstrated to show deficits specific to AD and mild cognitive impairment. These deficits are in the form of nerve fiber layer tissue drop out in the retina and optic nerve. The retrograde loss of nerve fiber layer tissue in the retina and optic nerve may be an early biomarker of AD, and these deficits in the nerve fiber layer of the retina and optic nerve may be the earliest sign of AD, even prior to damage to the hippocampal region that impacts memory.

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17

Ghazarossian, V., M. Laney, J. Vorpahl, J. Pease, C. Skold, R. Watts, H. Jeong, A. Dafforn, R. Cook, and E. F. Ullman. "A non-flow cytometric system for detecting antibodies and cellular antigens in blood." Clinical Chemistry 34, no. 9 (September 1, 1988): 1720–25. http://dx.doi.org/10.1093/clinchem/34.9.1717.

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Abstract The system described here can distinguish between single and agglutinated erythrocytes by use of a non-flow fiber optic fluorometer. The method is capable of detecting cell-surface antigens and antibodies to cell-surface antigens present in blood. Significant features include high-efficiency fluorescent dyes that intercalate into cell membranes, a stretching membrane for transport and mixing of samples, charged colloidal magnetite for magnetic separation of erythrocytes, and an immersible fiber optic probe for measuring fluorescence associated with cells in a 1-nL volume of a bulk solution. We describe the application of the system to automation of ABO/Rh grouping and antibody screening.

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18

Saito, Atsushi, Tatsuya Terai, Kei Makino, Masayuki Takahashi, Sachiko Yoshie, Masateru Ikehata, Yasuhiko Jimbo, Keiji Wada, Yukihisa Suzuki, and Satoshi Nakasono. "Real-time detection of stimulus response in cultured neurons by high-intensity intermediate-frequency magnetic field exposure." Integrative Biology 10, no. 8 (2018): 442–49. http://dx.doi.org/10.1039/c8ib00097b.

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19

Zaman, R. T., H. Kosuge, C. Carpenter, C. Sun, M. V. McConnell, and L. Xing. "Scintillating Balloon-Enabled Fiber-Optic System for Radionuclide Imaging of Atherosclerotic Plaques." Journal of Nuclear Medicine 56, no. 5 (April 9, 2015): 771–77. http://dx.doi.org/10.2967/jnumed.114.153239.

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20

Han, Jae-Ho, and Sang Min Yoon. "Integrated Near-Infrared Dual-Modality Imaging With Common Path Fiber Optic System." IEEE Transactions on Instrumentation and Measurement 60, no. 12 (December 2011): 3958–61. http://dx.doi.org/10.1109/tim.2011.2164822.

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21

Duan, Xiaojie, Fajie Duan, and Changrong Lv. "Three-Dimensional Shape Reconstruction System Based on Fiber-Optic Interference Fringe Imaging." International Journal of Imaging Systems and Technology 22, no. 4 (November 2012): 9–14. http://dx.doi.org/10.1002/ima.22024.

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22

Naghshvarianjahromi, Mahdi, Shiva Kumar, and M. Jamal Deen. "Brain Inspired Dynamic System for the Quality of Service Control over the Long-Haul Nonlinear Fiber-Optic Link." Sensors 19, no. 9 (May 10, 2019): 2175. http://dx.doi.org/10.3390/s19092175.

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Brain-inspired intelligence using the cognitive dynamic system (CDS) concept is proposed to control the quality-of-service (QoS) over a long-haul fiber-optic link that is nonlinear and with non-Gaussian channel noise. Digital techniques such as digital-back-propagation (DBP) assume that the fiber optic link parameters, such as loss, dispersion, and nonlinear coefficients, are known at the receiver. However, the proposed CDS does not need to know about the fiber optic link physical parameters, and it can improve the bit error rate (BER) or enhance the data rate based on information extracted from the fiber optic link. The information extraction (Bayesian statistical modeling) using intelligent perception processing on the received data, or using the previously extracted models in the model library, is carried out to estimate the transmitted data in the receiver. Then, the BER is sent to the executive through the main feedback channel and the executive produces actions on the physical system/signal to ensure that the BER is continuously under the forward-error-correction (FEC) threshold. Therefore, the proposed CDS is an intelligent and adaptive system that can mitigate disturbance in the fiber optic link (especially in an optical network) using prediction in the perceptor and/or doing proper actions in the executive based on BER and the internal reward. A simplified CDS was implemented for nonlinear fiber optic systems based on orthogonal frequency division multiplexing (OFDM) to show how the proposed CDS can bring noticeable improvement in the system’s performance. As a result, enhancement of the data rate by 12.5% and the Q-factor improvement of 2.74 dB were achieved in comparison to the conventional system (i.e., the system without smart brain).

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23

Shike, Moshe, Zvi Fireman, Rami Eliakim, Ori Segol, Alan Sloyer, Lawrence B. Cohen, Sharon Goldfarb-Albak, and Alessandro Repici. "Sightline ColonoSight system for a disposable, power-assisted, non-fiber-optic colonoscopy (with video)." Gastrointestinal Endoscopy 68, no. 4 (October 2008): 701–10. http://dx.doi.org/10.1016/j.gie.2007.12.062.

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24

Wong, J. W., W. R. Binns, A. Y. Chengl, L. Y. Geer, J. W. Epstein, and J. Klarmann. "On-line radiotherapy imaging. i: refinement of a fiber-optic imaging system for clinical applications." International Journal of Radiation Oncology*Biology*Physics 17 (January 1989): 158–59. http://dx.doi.org/10.1016/0360-3016(89)90714-1.

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25

Pourrastegar, Azita, Hesham Othman, and Hesham Marzouk. "Vibration-based damage identification for reinforced concrete slab-type structures using fiber-optic sensors and random decrement technique." RILEM Technical Letters 4 (May 8, 2020): 163–71. http://dx.doi.org/10.21809/rilemtechlett.2019.103.

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This paper presents and evaluates a damage identification system for reinforced concrete (RC) slab-type structures based on non-destructive vibration testing, Random decrement (RD) signal processing technique, and embedded smart network of fiber-optic sensors. The proposed system aims to overcome the challenges associated with the use of electrical sensors and signal processing of noisy dynamic data. Two experimental modal analysis investigations have been conducted. First modal testing focuses on investigating the capability of fiber-optic sensors and Multi-channel random decrement (MCRD) processing technique to locate damage in RC slabs through changes in the first mode shape response with damage. The second modal testing focuses on the detection of damage intensity using the RD technique through the change in frequency and damping dynamic parameters. The results show that RD technique can be used effectively to extract the free vibration response of RC slab-type structures; fiber-optic sensors are more sensitive to capture damage severity in comparison to electrical accelerometer sensors, especially, at steel yielding and failure load; MCRD technique can be used effectively to generate mode shapes for RC slabs based on fiber-optic grating FBG sensors measurements. On the other hand, electrical strain gauges were noisy and it was difficult to obtain any measurable data; A damage identification system based on non-destructive vibration testing, MCRD processing technique, and using an embedded smart network of fiber-optic sensors can estimate accurately the damage location through changes in the first mode shape.

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26

Pelivanov, Ivan, and Matthew O’Donnell. "Imaging of porosity in fiber-reinforced composites with a fiber-optic pump–probe laser-ultrasound system." Composites Part A: Applied Science and Manufacturing 79 (December 2015): 43–51. http://dx.doi.org/10.1016/j.compositesa.2015.09.014.

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27

Kilpatrick, James M., and Vladimir B. Markov. "Full-Field Laser Vibrometer for Instantaneous Vibration Measurement and Non-Destructive Inspection." Key Engineering Materials 437 (May 2010): 407–11. http://dx.doi.org/10.4028/www.scientific.net/kem.437.407.

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We describe a system for real-time, full-field vibrometry, incorporating features of high-speed electronic speckle pattern interferometry (ESPI) and laser Doppler velocimetry (LDV). Based on a 2D interferometric sensor array, comprising 16×16 parallel illumination and detection channels, the matrix laser vibrometer (MLV), captures full-field data instantaneously, without beam scanning. The instrument design draws on the advantages of scale offered by modern telecommunications fiber optic and digital electronics. The resulting architecture, comprising a compact measurement probe linked by fiber optic umbilical to a remote electronics unit, facilitates practical application to the full-field study of transient vibrations and rapid non-destructive inspection of composite materials.

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28

PENG, CHONG, and PEIQIANG ZHANG. "AN OPTIC-FIBER INTERFEROMETER FOR THE DYNAMIC CHARACTERIZATION OF MICROSTRUCTURES." International Journal of Information Acquisition 01, no. 02 (June 2004): 129–34. http://dx.doi.org/10.1142/s0219878904000185.

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This article describes a measurement system designed to evaluate the dynamic characteristics of micromechanical structures. The system is based on Active Homodyne demodulation M-Z optic-fiber interferometer and can measure out-of-plane movement with a sensitivity of 0.1 nm. To validate the system, vibration measurements have been carried on a typical MEMS structure — the sensitive elements of a kind of uncooled IR imaging system, an array of micromachined bimaterial cantilevers (micron dimensions) — and the results are compared with the ones from FEM model analysis and another measurement method which can be known as spectrum plane optic filtering. The three results agree with each other. The first natural frequencies of the structures are determined from data obtained by vibrating the structures using a PZT excitation system. The mode shapes and modal damping will be carried out soon after a scanning system is completed.

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Huang, H. K., R. H. Tecotzky, and Todd Bazzill. "A fiber-optic broadband CT/MR video communication system." Journal of Digital Imaging 5, no. 1 (February 1992): 20–25. http://dx.doi.org/10.1007/bf03167820.

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30

Stolarik, Martin, Jan Nedoma, Radek Martinek, Stanislav Kepak, Eva Hrubesova, Miroslav Pinka, and Jakub Kolarik. "New Methods to Seismic Monitoring: Laboratory Comparative Study of Michelson Fiber-Optic Interferometer and Pneumatic Measurement Systems." Photonics 8, no. 5 (April 28, 2021): 147. http://dx.doi.org/10.3390/photonics8050147.

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New possibilities of vibration monitoring can be found in completely different physical approaches, where all measuring technology is currently based on sensors in the electrical domain. This paper presents two different promising alternative approaches to vibration measurement, specifically in the field of fiber-optics and pneumatic sensors. The proposed solution uses a Michelson fiber-optic interferometer designed without polarization fading and with operationally passive demodulation technique using three mutually phase-shifted optical outputs. Experimentally developed sensor systems for the registration of anthropogenic seismic phenomena were complemented by standard instrumentation for measuring seismicity used as a standard. The measurement was performed under simplified conditions using a calibrated stroke as a source of dynamic loading. In addition to alternative systems, the paper also presents the results of recalculation of the measured values in a time domain and basic relationships for the conversion to basic units derived from the SI (International System of Units) system and used internationally in the field of seismic engineering. The results presented demonstrate that even systems operating on a different physical principle have great potential to replace the existing seismic devices. The correlation coefficients for both sensory devices were high (above 0.9) and the average deviations from the measured values of the amplitude of the oscillation velocity did not exceed the value of 0.02, neither with the fiber-optic or pneumatic sensor.

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31

Gilmore, Daniel A., Donald Gurka, and M. Bonner Denton. "Quantitative Detection of Environmentally Important Dyes Using Diode Laser/Fiber-Optic Raman Spectroscopy." Applied Spectroscopy 49, no. 4 (April 1995): 508–12. http://dx.doi.org/10.1366/0003702953964390.

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A compact diode laser/fiber-optic Raman spectrometer is used for quantitative detection of environmentally important dyes. This system is based on diode laser excitation at 782 nm, fiber-optic probe technology, an imaging spectrometer, and a state-of-the-art scientific CCD camera. The dyes studied include trypan blue, acid black 1, acid blue 40, and basic blue 7. Detection sensitivities (at rms S/N = 2) ranged from 0.2 ppm (3.24 × 10−7 M) for acid black 1, to 25 ppm (4.86 × 10−5 M) for basic blue 7.

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Rahman, Husna Abdul, Adi Izhar Che Ani, Sulaiman Wadi Harun, Moh Yasin, Retna Apsari, and Harith Ahmad. "Feasibility of fiber optic displacement sensor scanning system for imaging of dental cavity." Journal of Biomedical Optics 17, no. 7 (May 21, 2012): 071308. http://dx.doi.org/10.1117/1.jbo.17.7.071308.

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33

Bradley, C., J. Bohlmann, and S. Kurada. "A Fiber Optic Sensor for Surface Roughness Measurement." Journal of Manufacturing Science and Engineering 120, no. 2 (May 1, 1998): 359–67. http://dx.doi.org/10.1115/1.2830135.

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A fiber optical interferometer system is described for non-contact measurement of surface topography. The system employs a fiber optic guide and lens arrangement that forms an interferometric cavity between the lens front face and the test surface. Changes in the surface topography are manifested as phase changes between the light reflected from the surface and the front face of the lens. An electronic control and data acquisition system converts the phase change into a voltage signal proportional to surface height. The system is calibrated and compared with stylus surface profile measurements performed on a standard set of machined surface samples. Comparison of the amplitude parameter, Ra, shows differences of between 17 percent and 34 percent across the set of samples, whereas, two spatial parameters, frequency and peak count, consistently compare within 1 percent to 12 percent throughout the Ra range: 0.42 μm ≤ Ra ≤ 2.89 μm.

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Uddin, Nezam, Qiwen Sheng, Seungsup Lee, Matthew L. Reinke, David Donovan, Morgan Shafer, and Ming Han. "Multichannel Fiber-Optic Silicon Fabry–Pérot Interferometric Bolometer System for Plasma Radiation Measurements." Photonics 8, no. 9 (August 25, 2021): 344. http://dx.doi.org/10.3390/photonics8090344.

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A single-channel fiber-optic bolometer system based on a high-finesse silicon Fabry–Pérot interferometer (FPI) was previously reported, intended to measure plasma radiation from the magnetically confined fusion chamber. Recently, we developed a multichannel fiber-optic bolometer system with five bolometers multiplexed using a coarse wavelength division multiplexer (CWDM) and interrogated with a white-light system involving a superluminescent light-emission diode source and a high-speed spectrometer. One of the bolometers was used as the reference bolometer to compensate for the ambient temperature variations, and the other four bolometers were used for radiation measurement. The bolometers have a simple structure with a silicon pillar at the end of the single-mode fiber and a gold disk on the other side of the silicon pillar. They are also easy to fabricate without stringent requirements on the optical alignment. Analysis of the system optimization was performed to improve the noise performance and to mitigate the vibration effect that may present in the practical application. The system had a significantly enhanced measurement range compared to the previous high-finesse FPI bolometer system for measuring radiation. Test results performed in air using a 405 nm laser as the radiation source showed that the temperature resolution and the noise-equivalent power density of the sensing bolometers connected to each channel of the CWDM were, respectively, ~0.4 mK and ~0.1 W/m2, with a time constant of ~220 ms, which is comparable to the previous more complicated fiber-optic bolometer systems based on high-finesse FPIs that were interrogated using wavelength-scanning lasers.

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35

Fajkus, Marcel, Jan Nedoma, Radek Martinek, Vladimir Vasinek, Homer Nazeran, and Petr Siska. "A Non-Invasive Multichannel Hybrid Fiber-Optic Sensor System for Vital Sign Monitoring." Sensors 17, no. 12 (January 8, 2017): 111. http://dx.doi.org/10.3390/s17010111.

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Mela, Christopher, Francis Papay, and Yang Liu. "Novel Multimodal, Multiscale Imaging System with Augmented Reality." Diagnostics 11, no. 3 (March 4, 2021): 441. http://dx.doi.org/10.3390/diagnostics11030441.

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A novel multimodal, multiscale imaging system with augmented reality capability were developed and characterized. The system offers 3D color reflectance imaging, 3D fluorescence imaging, and augmented reality in real time. Multiscale fluorescence imaging was enabled by developing and integrating an in vivo fiber-optic microscope. Real-time ultrasound-fluorescence multimodal imaging used optically tracked fiducial markers for registration. Tomographical data are also incorporated using optically tracked fiducial markers for registration. Furthermore, we characterized system performance and registration accuracy in a benchtop setting. The multiscale fluorescence imaging facilitated assessing the functional status of tissues, extending the minimal resolution of fluorescence imaging to ~17.5 µm. The system achieved a mean of Target Registration error of less than 2 mm for registering fluorescence images to ultrasound images and MRI-based 3D model, which is within clinically acceptable range. The low latency and high frame rate of the prototype system has shown the promise of applying the reported techniques in clinically relevant settings in the future.

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Dekel, B. "Fiber optic thermal imaging system based on hollow glass waveguides or silver halide fibers as scanning elements." Optical Engineering 39, no. 4 (April 1, 2000): 941. http://dx.doi.org/10.1117/1.602458.

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Saito, Atsushi, Masayuki Takahashi, Yasuhiko Jimbo, and Satoshi Nakasono. "Non-conductive and miniature fiber-optic imaging system for real-time detection of neuronal activity in time-varying electromagnetic fields." Biosensors and Bioelectronics 87 (January 2017): 786–93. http://dx.doi.org/10.1016/j.bios.2016.09.024.

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39

Isnawati, Anggun Fitrian, Riyanto Riyanto, and Ajeng Enggar Wijayanti. "Pengaruh Dispersi Terhadap Kecepatan Data Komunikasi Optik Menggunakan Pengkodean Return To Zero (RZ) Dan Non Return To Zero (NRZ)." JURNAL INFOTEL - Informatika Telekomunikasi Elektronika 1, no. 2 (November 10, 2009): 1. http://dx.doi.org/10.20895/infotel.v1i2.65.

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Fiber optic has characteristics for optical transmission system. One of optical characteristics is pulse broadening, known as dispersion. The dispersion is a condition where pulse in output side is larger than pulse in input side. It means that pulse broadening had happened. In the communication system, it’s known as inter symbol interference (ISI). Effect of Inter symbol interference increasing the error bit or BER value. In optical communication system, dispersion is most influence to the data rate that fiber can support. Besides, bandwidth, information capacity, transmission distance, wavelength and fiber type can also influenced by the dispersion.

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Raizada, Seemant, Jamal Al Kandari, and Khalid Al Sabti. "Ophthalmic endoscope: A novel diagnostic imaging tool." International Journal of Diagnostic Imaging 4, no. 2 (March 16, 2017): 9. http://dx.doi.org/10.5430/ijdi.v4n2p9.

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The purpose of the study was to evaluate the feasibility of ophthalmic endoscope as a diagnostic tool. This was a prospective, non-comparative, interventional clinical study of 11 consecutive patients who underwent endoscopy-assisted management for ocular pathologies. We used a fused fiber-optic type of endoscope to visualize areas of the eye which were not seen clearly, due to media opacity, through conventional viewing systems like indirect ophthalmoscopy or wide angle viewing system. Eleven cases were enrolled in the study. Five patients underwent endoscopic examination of the fundus prior to penetrating keratoplasty (PKP) or keratoprosthesis. In one out of these 5 cases, PKP was differed due to pale optic nerve. Patient number 6, 7 & 8 were cases of recurrent vitreous hemorrhage. In these patients, endoscope was used to inspect the sclerotomy from inside and to remove incarcerated vitreous and fibro-vascular membrane. Patient number 9 was a case of poorly dilating pupil undergoing cataract surgery. Endoscope was used in this patient to locate the exact position of haptics of PCIOL. In cases 10 and 11, endoscope was used to localize ciliary sulcus and to document the position of haptics of sclera fixated IOL. Conclusion: The ophthalmic endoscope provides valuable information by illuminating, video recording, and by providing clear view of areas not visible by conventional viewing systems. It can help in management strategies in selected cases.

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Lyu, Weimin, Shuyang Chen, Fengze Tan, and Changyuan Yu. "Vital Signs Monitoring Based on Interferometric Fiber Optic Sensors." Photonics 9, no. 2 (January 18, 2022): 50. http://dx.doi.org/10.3390/photonics9020050.

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Due to the improvement of living standards, people’s attention to health has gradually increased. More and more people are willing to spend money and time on health management. This article reviews work on the vital signs monitoring system based on fiber optic interferometers, including the design of sensor structures, signal demodulation methods and data analysis. After a large number of trials, the system can achieve long-term stable heart rate (HR), respiration rate (RR) and body temperature monitoring, and the collected data can be used for health analysis. Due to the high sensitivity, low cost, and light weight of the interferometric fiber optic sensor, it can be integrated under a mattress or a cushion, which is very suitable for daily use. The system has great application prospects in the field of healthcare.

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Wu, Yicong, Yuxin Leng, Jiefeng Xi, and Xingde Li. "Scanning all-fiber-optic endomicroscopy system for 3D nonlinear optical imaging of biological tissues." Optics Express 17, no. 10 (April 28, 2009): 7907. http://dx.doi.org/10.1364/oe.17.007907.

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Rydfjord, Jonas, Fredrik Svensson, Magnus Fagrell, Jonas Sävmarker, Måns Thulin, and Mats Larhed. "Temperature measurements with two different IR sensors in a continuous-flow microwave heated system." Beilstein Journal of Organic Chemistry 9 (October 10, 2013): 2079–87. http://dx.doi.org/10.3762/bjoc.9.244.

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In a continuous-flow system equipped with a nonresonant microwave applicator we have investigated how to best assess the actual temperature of microwave heated organic solvents with different characteristics. This is non-trivial as the electromagnetic field will influence most traditional methods of temperature measurement. Thus, we used a microwave transparent fiber optic probe, capable of measuring the temperature inside the reactor, and investigated two different IR sensors as non-contact alternatives to the internal probe. IR sensor 1 measures the temperature on the outside of the reactor whilst IR sensor 2 is designed to measure the temperature of the fluid through the borosilicate glass that constitutes the reactor wall. We have also, in addition to the characterization of the before mentioned IR sensors, developed statistical models to correlate the IR sensor reading to a correct value of the inner temperature (as determined by the internal fiber optic probe), thereby providing a non-contact, indirect, temperature assessment of the heated solvent. The accuracy achieved with these models lie well within the range desired for most synthetic chemistry applications.

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Tyagi, Rishita. "Simulation and Performance Analysis of RoF System Using Fiber Impairments." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (May 31, 2022): 2055–61. http://dx.doi.org/10.22214/ijraset.2022.42759.

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Abstract: A Radio over Fiber (RoF) system has a unique feature of containing both a fiber optic link and a free space radio path. Fiber based wireless access facilitates high-capacity multimedia services in a real-time basis. In this research paper, the RoF system is simulated in the presence of fiber impairments, namely, Polarization Mode Dispersion (PMD) and Cross Phase Modulation (XPM) and Four-Wave Mixing (FWM) with the help of OptiSystem simulation tool. The variations in Quality factor (Q factor) and Bit Error Rate (BER) with respect to wavelength of 1552 nm and bit rates of 10 Gb/s of input signal is analyzed in the presence of the linear and non-linear impairments of the fiber. Keywords: Radio over Fiber (RoF), Polarization Mode Dispersion (PMD), Cross Phase Modulation (XPM), Four-Wave Mixing (FWM), OptiSystem, Bit Error Rate (BER), Q factor.

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Alekseev, V. A., M. R. Zaripov, A. S. Perminov, E. A. Sitnikova, V. P. Usol’tsev, and S. I. Yuran. "Increasing of Pulsed Laser Source Peak Power by Use of Ring Fiber-Optic Delay Line." Devices and Methods of Measurements 10, no. 2 (June 24, 2019): 151–59. http://dx.doi.org/10.21122/2220-9506-2019-10-2-151-159.

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At the present time, developing of autonomous laser systems requires increasing of the output power of the laser sources used in composition of those systems and at the same time reducing of the energy usage in the system. The possibility of increasing output peak power of pulsed laser sources by using the method of synchronous non-coherent beam combining in ring fiber-optic delay line is considered by authors. Objective of this work was estimating energy effectiveness of laser systems, which based on this method.General constructing method of the laser pulsed laser source with ring fiber delay line is considered, its block diagram and the general operating principle of similar systems are presented. Two versions of laser systems based on the described method of beam combining are presented: using an optical combiner and an optical switch; using fiber welding instead of a combiner and an optical switch. The graphical dependence of the energy effectiveness on the number of circulations in ring fiber-optic delay line is obtained for both versions of laser systems.As a result of the analysis of the considered devices operation, it was shown that considered systems allow to obtain increasing the peak power of a laser pulse without increasing the power supply, also the system, that use welded fi instead of the optical combiner, has greater effi than system with optical combiner.

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46

Romashko, Roman V., Yuri Kulchin, S. D. Girolamo, A. Kamshilin, and J. C. Launay. "Adaptive Fiber-Optical Sensor System for Pico-Strain and Nano-Displacement Metrology." Key Engineering Materials 381-382 (June 2008): 61–64. http://dx.doi.org/10.4028/www.scientific.net/kem.381-382.61.

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Adaptive fiber-optic interferometer which is based on multimode optical fiber as a sensor and diffusion holograms recorded in semiconductor photorefractive crystal CdTe:V without any electric field is developed. The interferometer sensitivity achieved is only 5.7 times less then highest sensitivity which is possible only in non-adaptive lossless classical interferometer. A practical detection limit is equal to Hz W nm 10 0 3 5 − × . , which allows to broadband detecting of an object’s displacement of order 0.2 nm or deformation of order 2 pε with using light sources having only 5 mW optical power.

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Zhan, Zhongwen. "Distributed Acoustic Sensing Turns Fiber‐Optic Cables into Sensitive Seismic Antennas." Seismological Research Letters 91, no. 1 (December 4, 2019): 1–15. http://dx.doi.org/10.1785/0220190112.

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Abstract Distributed acoustic sensing (DAS) is a new, relatively inexpensive technology that is rapidly demonstrating its promise for recording earthquake waves and other seismic signals in a wide range of research and public safety arenas. It should significantly augment present seismic networks. For several important applications, it should be superior. It employs ordinary fiber‐optic cables, but not as channels for data among separate sophisticated instruments. With DAS, the hair‐thin glass fibers themselves are the sensors. Internal natural flaws serve as seismic strainmeters, kinds of seismic detector. Unused or dark fibers are common in fiber cables widespread around the globe, or in dedicated cables designed for special application, are appropriate for DAS. They can sample passing seismic waves at locations every few meters or closer along paths stretching for tens of kilometers. DAS arrays should enrich the three major areas of local and regional seismology: earthquake monitoring, imaging of faults and many other geologic formations, and hazard assessment. Recent laboratory and field results from DAS tests underscore its broad bandwidth and high‐waveform fidelity. Thus, while still in its infancy, DAS already has shown itself as the working heart—or perhaps ear drums—of a valuable new seismic listening tool. My colleagues and I expect rapid growth of applications. We further expect it to spread into such frontiers as ocean‐bottom seismology, glacial and related cryoseismology, and seismology on other solar system bodies.

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Pelivanov, Ivan, Takashi Buma, Jinjun Xia, Chen-Wei Wei, and Matthew O’Donnell. "NDT of fiber-reinforced composites with a new fiber-optic pump–probe laser-ultrasound system." Photoacoustics 2, no. 2 (June 2014): 63–74. http://dx.doi.org/10.1016/j.pacs.2014.01.001.

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Pelletier, M. J., J. Slater, K. L. Davis, W. K. Kowalchyk, and I. R. Lewis. "Robust Fiber-Optic Coupled Confocal Raman Microscopy for Research and Quality Control Applications." Microscopy and Microanalysis 3, S2 (August 1997): 823–24. http://dx.doi.org/10.1017/s1431927600011004.

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In this paper we report the continuing development of a novel fiber-optic coupled confocal Raman microscope which can offer spectral resolutions up to 0.6 cm−1 per pixel, spatial resolutions of 1 micron or less with axial resolutions of 2-3 microns. The system is based around a compact base unit which comprises a compact solid-state laser, a proprietary f/1.8 imaging spectrograph, and a TE-cooled CCD detector operating at −70°C.In Figure 1 a schematic of the fiber coupled microscope is shown. The microscope includes a integrated holographic filter module to prevent silica Raman generated in the excitation fiber from reaching the sample and to reject radiation at the excitation wavelength from being returned to the spectrograph via the collection fiber(s). The architecture has been designed to allow both fluorescence imaging and Raman microspectroscopy to be accomplished without removing the sample. The figure also depicts the positions of linear polarizers which can be used to collect polarized Raman spectra from small particles or thin polymer laminate samples.

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Kawanishi, Tetsuya, Atsushi Kanno, Pham Tien Dat, Toshimasa Umezawa, and Naokatsu Yamamoto. "Photonic Systems and Devices for Linear Cell Radar." Applied Sciences 9, no. 3 (February 7, 2019): 554. http://dx.doi.org/10.3390/app9030554.

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This paper reviews linear cell radar systems, which are radar systems consisting of many antenna units connected by radio-over-fiber to monitor linear-shaped areas. A linear cell system using a millimeter-wave band can provide high-resolution imaging for foreign object detection on runways. Electro-optic devices play important roles in linear cell systems to provide a conversion between optical and electric signals. This paper describes overviews of such devices including light sources, photodetectors, and optical modulators, etc.

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