An improved PGC demodulation algorithm of interferometric sensor for eliminating the intensity disturbance

Xiudong Liang; Xinxin Li; Shenglai Zhen; Xuqiang Wu; Kai Qian; Benli Yu

doi:10.1117/12.2327134

24 July 2018 An improved PGC demodulation algorithm of interferometric sensor for eliminating the intensity disturbance

Xiudong Liang, Xinxin Li, Shenglai Zhen, Xuqiang Wu, Kai Qian, Benli Yu

Proceedings Volume 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018); 108273E (2018) https://doi.org/10.1117/12.2327134
Event: Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018, Shanghai, China

Abstract

A modified phase generated carrier (PGC) demodulation algorithm for interferometric sensor is presented in this letter. Compared with the differential-cross-multiplying measure (PGC-DCM algorithm), the effect of light intensity disturbance (LID) is eliminated. Additionally, the harmonic distortion of arctangent measure (PGC-arctan algorithm) is well suppressed. In the experiment, while the simulated LID frequency is settled to 50 Hz, the signal-to-noise of the improved PGC algorithm respectively receives an increase of 10.3 dB and 18.2 dB over PGC-DCM and PGC-Arctan algorithms. The system has a dynamic range of 45.9 dB at 600 Hz by employing the improved PGC demodulation algorithm.

Citation Download Citation

Xiudong Liang, Xinxin Li, Shenglai Zhen, Xuqiang Wu, Kai Qian, and Benli Yu "An improved PGC demodulation algorithm of interferometric sensor for eliminating the intensity disturbance", Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 108273E (24 July 2018); https://doi.org/10.1117/12.2327134

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KEYWORDS

Demodulation

Distortion

Interferometry

Sensors

Interferometers

Phase shifts

Homodyne detection

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