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A method of phase demodulation of OFDR based on ARC-DSM algorithm
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1. School of Electronic Information Engineering, Hebei University of Technology, Tianjin 300401, China;2. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China

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    Abstract:

    Aiming at low stability and high harmonic distortion of the traditional phase-generated carrier (PGC) demodulation algorithm, we propose a modified demodulation algorithm for distributed strain sensing in phase-sensitive optical frequency domain reflectometry (OFDR). The proposed algorithm combines the arctangent function and differential-self-multiplying (ARC-DSM), which eliminates the effect of modulation depth and realizes the high precision strain variation measurements. Simulation results show that distortion and harmonic distortion are effectively suppressed by the ARC-DSM algorithm. The minimum variation of the measurable static strain is about 0.3με and the spatial resolution can reach 0.2 m within 270 m range.

    Reference
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LIU Jianfei, LI Chao, FAN Xujun, LUO Mingming, LUAN Nannan, YANG Wenrong. A method of phase demodulation of OFDR based on ARC-DSM algorithm[J]. Optoelectronics Letters,2022,18(1):13-17

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History
  • Received:May 21,2021
  • Revised:July 15,2021
  • Online: February 18,2022
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