Research on zero drift suppression method of arctangent demodulation algorithm for fiber optic acoustic sensors

Chen Zhao; Junpeng Zhao; Baichao Zheng; Yufei Zhang; Yong Yang

doi:10.1117/12.2615774

26 July 2022 Research on zero drift suppression method of arctangent demodulation algorithm for fiber optic acoustic sensors

Chen Zhao, Junpeng Zhao, Baichao Zheng, Yufei Zhang, Yong Yang

Author Affiliations +

Proceedings Volume 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 122790K (2022) https://doi.org/10.1117/12.2615774
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

A zero drift suppression method of arctangent demodulation algorithm for fiber optic acoustic sensors is studied in this paper. Firstly, the principle of the arctangent demodulation algorithm is introduced, with emphasis on the principle and implementation method of the phase unwrapping. Then, the design and implementation idea of the zero drift suppression method are described in detail. A PID method is used to get the compensation value, which will be fed back to the next phase unwrapping stage, so as to gradually eliminate the zero drift. By adding a decimation unit and combining the low-pass filter unit and the PID unit, the complexity of the algorithm and the design difficulty of the filter are greatly reduced. The designed zero drift suppression method is implemented in FPGA. An actual fiber optic microphone is demodulated under laboratory conditions. The experiment results prove that the zero drift suppression method designed in this paper can stabilize the static operating point of the fiber optic microphone effectively. As the zero drift problem is solved in algorithm, there are no any hardware modification and additional cost.

Citation Download Citation

Chen Zhao, Junpeng Zhao, Baichao Zheng, Yufei Zhang, and Yong Yang "Research on zero drift suppression method of arctangent demodulation algorithm for fiber optic acoustic sensors", Proc. SPIE 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 122790K (26 July 2022); https://doi.org/10.1117/12.2615774

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