Abstract

In this study, a high-precision rotation angle measurement method based on polarization self-mixing interference (SMI) is proposed. The higher signal-to-noise ratio SMI signal can be obtained by the differential processing of two polarized SMI signals with opposite phases. In order to reduce the influence of the speckle effect, the envelope signal is used to normalize the SMI signal. The fringe subdivision method is used to improve the accuracy of the rotation angle measurement. The experimental results show that the error of the rotation angle measurement is within ±0.5%, and the measurement range can reach up to 20°.

© 2023 Optica Publishing Group

Rotation angle measurement method based on self-mixing interference of a fiber laser

Yan Zhao, Yonghang Zhang, Haiwei Zhang, Lifang Xue, Minjia Ren, and Yinping Miao
Appl. Opt. 61(11) 3174-3181 (2022)

Vibration measurement technology based on the reverse point recognition algorithm for laser self-mixing interference

Xiangyu Cui, Linna Cai, Hangyu Yue, Taiji Dong, Wendi Yan, Yang Song, Chunsheng Li, and Bingkun Gao
Appl. Opt. 60(34) 10736-10742 (2021)

Rotational speed measurement using self-mixing interferometry

Yang Liu, Jigou Liu, and Ralph Kennel
Appl. Opt. 60(17) 5074-5080 (2021)

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)

High-precision single-axis rotation measurement method of multi-rudders based on monocular vision

Junwei Sha, Junqi Lei, Guili Xu, and Yongqiang Ye
Appl. Opt. 62(12) 3208-3214 (2023)