Abstract

Traditional phase generation carrier technology requires to control the modulation depth at an optimal value for accurate demodulation. In this paper, we proposed an algorithm to directly eliminate the real-time phase modulation depth based on multi-harmonics frequency mixing technology for avoiding the influence of phase modulation depth on the demodulation result. Experiments show that when the modulation depth is in the range of 1.5 to 3.5 rad, the SINAD of the improved algorithm can reach 37.1 dB, which is 13.2 dB higher than that of the traditional PGC-Arctan algorithm on average. The THD of the improved algorithm can reach 0.322%, which always maintains the best level of the traditional PGC-Arctan algorithm. The algorithm provides an effective reference for the signal processing of the fiber-optic interferometric sensors in practical applications.

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)

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 to eliminate modulation depth and intensity disturbance

Yangtaozi Li, Hong Gao, Liguo Zhao, Zhipeng Fu, Juan Zhang, Zhen Li, and Xueguang Qiao
Appl. Opt. 61(19) 5722-5727 (2022)

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)

Direct nonlinear parameter estimation method for a phase generated carrier position sensor

Haoyu Zhao, Zhimou Xu, and Donglin Ma
Opt. Express 31(15) 24702-24716 (2023)