Recent progress in optical fiber pressure gradient sensors

Shuidong Xiong; Fuyin Wang; Qiong Yao; Hu Chen; Qingkai Hou; Lifeng Xia

doi:10.1117/12.2575371

29 October 2020 Recent progress in optical fiber pressure gradient sensors

Shuidong Xiong, Fuyin Wang, Qiong Yao, Hu Chen, Qingkai Hou, Lifeng Xia

Proceedings Volume 11554, Advanced Sensor Systems and Applications X; 115540P (2020) https://doi.org/10.1117/12.2575371
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

Optical fiber pressure gradient sensors possess the merits of no suspension and easy installation compared to the co-vibration vector sensors. Recent studies are focused on the discrete structure made by individual pressure sensing units. Because the sensor is extremely sensitive to the difference between the units, improvements should be made in many areas, such as the manufacturing process, calibration method, and error correction. Benefited by the mature manufacturing process, a vector sensor with directivity larger than 40 dB is obtained. Considering that the measurement uncertainty is up to 0.7 dB in standing wave tube, an optimized calibration method is developed, which can eliminate the relative measurement error. Besides, an enhanced demodulation method is carried out to decrease the fluctuation of phase shift to within ±0.5 dB. 2-D and 3-D sensors are fabricated and tested on the lake and on the sea. Results show that the sensors have achieved good acoustic measurements.

Conference Presentation

Citation Download Citation

Shuidong Xiong, Fuyin Wang, Qiong Yao, Hu Chen, Qingkai Hou, and Lifeng Xia "Recent progress in optical fiber pressure gradient sensors", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 115540P (29 October 2020); https://doi.org/10.1117/12.2575371

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