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18 December 2019 Multipoint strain sensing system based on fiber loop ringdown and frequency-shifted interferometry
Zehao Chen, Chunfu Cheng, Yiwen Ou, Zhangyong Yang, Jiaxuan Chen, Hui Lv
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Proceedings Volume 11338, AOPC 2019: Optical Sensing and Imaging Technology; 113380O (2019) https://doi.org/10.1117/12.2541914
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China
Abstract
We proposed a novel multipoint sensing method for large strain measurement combined fiber loop ringdown (FLRD) and frequency-shifted interferometry (FSI). Using this method, a biconical tapered multimode fiber was used as a sensor head for large strain measurement and a serial dual-point strain sensing system was experimentally validated. By measuring the ringdown distance of each FSI-FLRD strain sensor, the strain and position of each sensor can be simultaneously obtained. Using such strain sensors, the strain sensitivities of 0.51337 km-1·mε-1 and 0.8667 km-1·mε-1 within a large measurement range of up to 6 mε were achieved.
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Zehao Chen, Chunfu Cheng, Yiwen Ou, Zhangyong Yang, Jiaxuan Chen, and Hui Lv "Multipoint strain sensing system based on fiber loop ringdown and frequency-shifted interferometry", Proc. SPIE 11338, AOPC 2019: Optical Sensing and Imaging Technology, 113380O (18 December 2019); https://doi.org/10.1117/12.2541914
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KEYWORDS
Sensors
Sensing systems
Interferometry
Data acquisition
Multimode fibers
Signal detection
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