Study On Optical Communications, Volume. 46, Issue 4, 54(2020)

Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity

GAO Zai-qing... ZHANG Shi-cheng*, NIU Yue-ping and GONG Shang-qing |Show fewer author(s)
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    To balance the trade-off between the measurement sensitivity and range of the Fiber Bragg Grating (FBG) ultrasonic detection sensor, a demodulation scheme based on Fabry Perot (FP) cavity and π-phase-shifted FBG (π-FBG) is proposed. The principle of demodulation based on FP cavity is analyzed and numerically simulated in detail. A group of demodulators consisting of two longitudinal modes of the FP cavity can double the system sensitivity, and has good linearity. A demodulator array can be constructed when expanding to multiple modes, which can greatly increase the system range, and effectively balance the trade-off between measurement sensitivity and range. Numerical simulation results show that this scheme is feasible under the practical parameters, and has the merits of high sensitivity and fast response speed.

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    GAO Zai-qing, ZHANG Shi-cheng, NIU Yue-ping, GONG Shang-qing. Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity[J]. Study On Optical Communications, 2020, 46(4): 54

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    Paper Information

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    Received: Jan. 17, 2020

    Accepted: --

    Published Online: Nov. 2, 2020

    The Author Email: Shi-cheng ZHANG (sczhang@ecust.edu.cn)

    DOI:10.13756/j.gtxyj.2020.04.011

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