Abstract

A new self-mixing interferometry quadrature demodulation method based on a lock-in amplifier technique is proposed. Sinusoidal phase modulation of the beam is obtained by an electro-optic modulator (EOM) in the external cavity. Then the real phase of the external target can be calculated by lock-in amplifier analysis method. In this paper, the validity of the proposed method is confirmed by theoretical analysis and means of simulated signals, and then it is demonstrated by several experimental measurements for target harmonic and arbitrary motion. The results show that the proposed method can get a high-precision measurement, even using a diffusive target.

© 2019 Optical Society of America

Multiple self-mixing interference based on phase modulation and demodulation for vibration measurement

Chunlei Jiang, Xin Wen, Shuxin Yin, and Yunfei Liu
Appl. Opt. 56(4) 1006-1011 (2017)

Self-mixing interferometer based on sinusoidal phase modulating technique

Dongmei Guo, Ming Wang, and Suqing Tan
Opt. Express 13(5) 1537-1543 (2005)

Secondary envelope extraction based on multiple Hilbert transforms for laser self-mixing micro-vibration measurement

Xiangyu Cui, Chunsheng Li, Yuhan Geng, Weijie Ge, Lingling Kan, and Zihua Zhang
Appl. Opt. 58(34) 9392-9397 (2019)

Equivalent wavelength self-mixing interferometry for displacement measurement

Zhen Huang, Chengwei Li, Songquan Li, and Dongyu Li
Appl. Opt. 55(25) 7120-7125 (2016)

Improving the measurement performance for a self-mixing interferometry-based displacement sensing system

Yuanlong Fan, Yanguang Yu, Jiangtao Xi, and Joe F. Chicharo
Appl. Opt. 50(26) 5064-5072 (2011)