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Keywords = Michelson–Sagnac interference

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27 pages, 6797 KB  
Review
Applications of Optical Fiber in Label-Free Biosensors and Bioimaging: A Review
by Baocheng Li, Ruochong Zhang, Renzhe Bi and Malini Olivo
Biosensors 2023, 13(1), 64; https://doi.org/10.3390/bios13010064 - 30 Dec 2022
Cited by 21 | Viewed by 5638
Abstract
Biosensing and bioimaging are essential in understanding biological and pathological processes in a living system, for example, in detecting and understanding certain diseases. Optical fiber has made remarkable contributions to the biosensing and bioimaging areas due to its unique advantages of compact size, [...] Read more.
Biosensing and bioimaging are essential in understanding biological and pathological processes in a living system, for example, in detecting and understanding certain diseases. Optical fiber has made remarkable contributions to the biosensing and bioimaging areas due to its unique advantages of compact size, immunity to electromagnetic interference, biocompatibility, fast response, etc. This review paper will present an overview of seven common types of optical fiber biosensors and optical fiber-based ultrasound detection in photoacoustic imaging (PAI) and the applications of these technologies in biosensing and bioimaging areas. Of course, there are many types of optical fiber biosensors. Still, this paper will review the most common ones: optical fiber grating, surface plasmon resonance, Sagnac interferometer, Mach–Zehnder interferometer, Michelson interferometer, Fabry–Perot Interferometer, lossy mode resonance, and surface-enhanced Raman scattering. Furthermore, different optical fiber techniques for detecting ultrasound in PAI are summarized. Finally, the main challenges and future development direction are briefly discussed. Full article
(This article belongs to the Special Issue Emerging Applications of Label-Free Optical Biosensors)
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9 pages, 2762 KB  
Article
Optimization of VGG16 Algorithm Pattern Recognition for Signals of Michelson–Sagnac Interference Vibration Sensing System
by Jing Cheng, Qiuheng Song, Hekuo Peng, Jingwei Huang, Hongyan Wu and Bo Jia
Photonics 2022, 9(8), 535; https://doi.org/10.3390/photonics9080535 - 30 Jul 2022
Cited by 10 | Viewed by 3370
Abstract
Signal recognition accuracy and recognition time are the two most important parameters of pattern recognition in a fiber optic vibration sensing system. To obtain high recognition accuracy and short recognition time, this paper optimized the VGG16 algorithm and carried out VGG16-1D and VGG16-2D [...] Read more.
Signal recognition accuracy and recognition time are the two most important parameters of pattern recognition in a fiber optic vibration sensing system. To obtain high recognition accuracy and short recognition time, this paper optimized the VGG16 algorithm and carried out VGG16-1D and VGG16-2D recognition on big data signals generated by a Michelson–Sagnac interferometric vibration sensor system. The results indicate that VGG16-1D has a higher accuracy of 98.44% and a shorter recognition time of 0.03 s. The proposed method is a more accurate and faster pattern recognition method for big data signals from optical fiber vibration sensing systems, which is helpful in promoting further applications of optical fiber sensing systems. Full article
(This article belongs to the Special Issue Micro-Nano Optics and High-End Measurement Instruments)
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31 pages, 3832 KB  
Review
Distributed Fiber-Optic Sensors for Vibration Detection
by Xin Liu, Baoquan Jin, Qing Bai, Yu Wang, Dong Wang and Yuncai Wang
Sensors 2016, 16(8), 1164; https://doi.org/10.3390/s16081164 - 26 Jul 2016
Cited by 247 | Viewed by 24374
Abstract
Distributed fiber-optic vibration sensors receive extensive investigation and play a significant role in the sensor panorama. Optical parameters such as light intensity, phase, polarization state, or light frequency will change when external vibration is applied on the sensing fiber. In this paper, various [...] Read more.
Distributed fiber-optic vibration sensors receive extensive investigation and play a significant role in the sensor panorama. Optical parameters such as light intensity, phase, polarization state, or light frequency will change when external vibration is applied on the sensing fiber. In this paper, various technologies of distributed fiber-optic vibration sensing are reviewed, from interferometric sensing technology, such as Sagnac, Mach–Zehnder, and Michelson, to backscattering-based sensing technology, such as phase-sensitive optical time domain reflectometer, polarization-optical time domain reflectometer, optical frequency domain reflectometer, as well as some combinations of interferometric and backscattering-based techniques. Their operation principles are presented and recent research efforts are also included. Finally, the applications of distributed fiber-optic vibration sensors are summarized, which mainly include structural health monitoring and perimeter security, etc. Overall, distributed fiber-optic vibration sensors possess the advantages of large-scale monitoring, good concealment, excellent flexibility, and immunity to electromagnetic interference, and thus show considerable potential for a variety of practical applications. Full article
(This article belongs to the Section Physical Sensors)
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