Range enhancement of the dynamic frequency measurement in phase-sensitive OTDR with a symmetric fiber interferometer

Zhenshi Sun; Kun Liu; Junfeng Jiang; Kang Xue; Yuelang Huang; Tiegen Liu

doi:10.1117/12.2616395

26 July 2022 Range enhancement of the dynamic frequency measurement in phase-sensitive OTDR with a symmetric fiber interferometer

Zhenshi Sun, Kun Liu, Junfeng Jiang, Kang Xue, Yuelang Huang, Tiegen Liu

Author Affiliations +

Proceedings Volume 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 1227906 (2022) https://doi.org/10.1117/12.2616395
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

The key technology for expanding the scope of application fields for the phase-sensitive optical time domain based reflectometer (Φ-OTDR) is to accurately demodulate the vibration position with a wide frequency range. Unfortunately, due to the restriction of the traveling time of the modulated pulse, it is very difficult to obtain the low frequency response with a high signal to noise ratio (SNR) and to achieve a higher detectable frequency response in the Φ-OTDR. In this paper, a scheme based on dual-wavelength probes is proposed and demonstrated to enhance the dynamic frequency range with a high SNR in the Φ-OTDR based distributed optical fiber vibration sensing system. Utilizing the small difference between the central wavelengths of the two laser sources, the location and the frequency information can be simultaneously obtained by the reflectometer and a symmetric based interferometer. In addition, to further improve the SNR of the demodulated vibration spectrum and to suppress the high-order harmonic effect induced by the piezoelectric transducer, an enhanced phase generated carrier demodulation algorithm is employed in the proposed scheme. In experiments, the proposed sensing scheme showed better performance compared to previous studies. Foreseeably, the proposed sensing scheme will greatly extend the sensing scope for the Φ-OTDR based system where a wide frequency response is required.

Citation Download Citation

Zhenshi Sun, Kun Liu, Junfeng Jiang, Kang Xue, Yuelang Huang, and Tiegen Liu "Range enhancement of the dynamic frequency measurement in phase-sensitive OTDR with a symmetric fiber interferometer", Proc. SPIE 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 1227906 (26 July 2022); https://doi.org/10.1117/12.2616395

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KEYWORDS

Demodulation

Signal to noise ratio

Modulation

Signal detection

Sensors

Optical filters

Backscatter

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