Abstract

In this paper, an improved phase generated carrier (PGC) demodulation algorithm based on frequency mixing and division difference is proposed. The effects of phase modulation depth variation and light intensity disturbance of the light source on the demodulated phase signal are investigated theoretically and experimentally. Compared to the traditional PGC differential-cross-multiplying (PGC-DCM) and PGC arctangent (PGC-Arctan) demodulation algorithms, the ameliorated demodulation algorithm eliminates the harmonic distortion of the demodulated signal by extracting the carrier modulation depth through frequency mixing. The demodulation error caused by the light intensity disturbance of the light source is suppressed by division difference. The stability of the demodulation system is improved. To verify the algorithm, a PGC demodulation system is built based on a Michelson interferometer. The experimental results show that when the frequency and amplitude of the sensed signal are set to 1 kHz and 0.4 rad, respectively, the signal-to-noise ratio with the proposed algorithm achieves a gain of 35.66 dB over the PGC-Arctan algorithm and 26.26 dB over the PGC-DCM algorithm.

© 2022 Optica Publishing Group

Interferometric sensor with a PGC-AD-DSM demodulation algorithm insensitive to phase modulation depth and light intensity disturbance

Ailing Zhang and Dan Li
Appl. Opt. 57(27) 7950-7955 (2018)

Improved phase generated carrier demodulation algorithm for eliminating light intensity disturbance and phase modulation amplitude variation

Youwan Tong, Hualin Zeng, Liyan Li, and Yan Zhou
Appl. Opt. 51(29) 6962-6967 (2012)

Improved PGC demodulation algorithm for fiber optic interferometric sensors

Mingda Zhu, Xinxin Wang, Jiaying Chang, and Haoyu Zhou
Opt. Express 32(2) 2162-2178 (2024)

Active linearized PGC demodulation with fusion of PGC-Arctan and PGC-DCM schemes for nonlinear error elimination in SPM interferometer

Benyong Chen, Jiancheng Jiang, Yingtian Lou, and Liping Yan
Opt. Express 30(13) 22999-23010 (2022)

High-stability PGC demodulation technique with an additional sinusoidal modulation based on an auxiliary reference interferometer and EFA

Shengquan Mu, Benli Yu, Lei Gui, Jinhui Shi, Dong Guang, Cheng Zuo, Wujun Zhang, Xiaonan Zhao, and Xuqiang Wu
Opt. Express 30(15) 26941-26954 (2022)