High-sensitivity and fast distributed optical fiber pressure sensor

Liqiang Qiu; Wenjuan Guo; Qiang Ding; Guanghui Wang; Yue Wang; Yongkang Dong

doi:10.1117/12.2625078

27 March 2022 High-sensitivity and fast distributed optical fiber pressure sensor

Liqiang Qiu, Wenjuan Guo, Qiang Ding, Guanghui Wang, Yue Wang, Yongkang Dong

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121697X (2022) https://doi.org/10.1117/12.2625078
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

A high-sensitivity and fast distributed optical fiber pressure sensor based on optical frequency-agile phase-sensitive optical time-domain reflectometry (φ-OTDR) technique is proposed, and the standard single-mode fiber (SMF) is used as sensing fiber to demonstrate its pressure sensing performance. Two electro-optic modulators (EOMs) are connected in series in the same optical path and modulated by an arbitrary waveform generator (AWG) to generate a set of frequency agile pulses. The duration of single frequency pulse is 250 ns, and the interval between the two sets of frequency-agile pulses sequence is 5 μs. The injection locking technique is used to filter and amplify the frequency-agile pulses with a higher extinction ratio, and make the peak power of the frequency-agile pulses more stable. The measurement results show that in the pressure range of 0 to 1.8 MPa, and the pressure sensitivity of Rayleigh scattering spectrum frequency shift difference of the standard SMF is 702.5 MHz/MPa, which is about 1000 times that of the standard SMF based on BOTDA method. With an average of 64 times, the single pressure measurement time is only 1.92 ms.

Citation Download Citation

Liqiang Qiu, Wenjuan Guo, Qiang Ding, Guanghui Wang, Yue Wang, and Yongkang Dong "High-sensitivity and fast distributed optical fiber pressure sensor", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121697X (27 March 2022); https://doi.org/10.1117/12.2625078

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