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18 December 2023 Sagnac interference-based sensitivity tunable optical fiber vibration sensing system
Zhou Zheng, Youlong Yu, Jingzhi Wang, Xinwei Chen
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Proceedings Volume 12968, AOPC 2023: Optic Fiber Gyro ; 129680O (2023) https://doi.org/10.1117/12.3003951
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China
Abstract
A vibration optic fiber sensing system with tunable sensitivity based on Sagnac interference is proposed and demonstrated. In virtue of the linear Sagnac interference structure, vibration sensitivity adjustment could be realized by changing the delay fiber length. The phase modulation depth on sensing fiber induced by intrusion disturbance is heavily influenced by the delay fiber length, which reflected in the intensity detected by the AC photo-detector, thus enabling the vibration sensitivity adjustment in optical sensing system. The relationship between the amplitude of intrusion disturbance and delay fiber length shows a sinusoidal function in absolute value.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Zhou Zheng, Youlong Yu, Jingzhi Wang, and Xinwei Chen "Sagnac interference-based sensitivity tunable optical fiber vibration sensing system", Proc. SPIE 12968, AOPC 2023: Optic Fiber Gyro , 129680O (18 December 2023); https://doi.org/10.1117/12.3003951
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KEYWORDS
Vibration
Sensing systems
Optical fibers
Sagnac interferometers
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