Dynamic distributed Brillouin optical fiber pressure sensor

Liqiang Qiu; Qi Chu; Tianfu Li; Yongkang Dong

doi:10.1117/12.2599261

18 June 2021 Dynamic distributed Brillouin optical fiber pressure sensor

Liqiang Qiu, Qi Chu, Tianfu Li, Yongkang Dong

Proceedings Volume 11850, First Optics Frontier Conference; 118500F (2021) https://doi.org/10.1117/12.2599261
Event: First Optics Frontier Conference, 2021, Hangzhou, China

Abstract

A dynamic distributed Brillouin optical fiber pressure sensor based on frequency agility technology is proposed, and the performance of dynamic and static pressure sensing is experimentally demonstrated. A set of frequency-agile pump pulse sequences with single pulse duration of 250 ns are generated by an arbitrary waveform generator. The interval of the frequency sweep pulse sequence is 30 μs, the maximum repetition frequency is 18.2 kHz, and the average is 64 times. Double-coated single-mode fiber (SMF) is used as the sensing fiber to enhance the pressure sensitivity of Brillouin frequency shift (BFS), which the outer coating diameter is 3000 μm. The BFS pressure sensitivity of -3.32 MHz/MPa is achieved in the pressure range of 0-24 MPa, which is about 4.5 times that of SMF. The measurement time of the proposed optical fiber pressure sensing system is only 3.52 ms. Furthermore, the dynamic pressure measurement experiment is carried out, and the continuous measurement of the dynamic range of 6-0 MPa is achieved, and the dynamic distributed pressure measurement ability of the sensing system is verified.

Citation Download Citation

Liqiang Qiu, Qi Chu, Tianfu Li, and Yongkang Dong "Dynamic distributed Brillouin optical fiber pressure sensor", Proc. SPIE 11850, First Optics Frontier Conference, 118500F (18 June 2021); https://doi.org/10.1117/12.2599261

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