Abstract

The self-mixing (SM) technique has been a promising optical measurement technique for a few decades. The estimation of the optical feedback factor $ C $ is the key to SM displacement measurement with a better resolution than half a wavelength. But this estimation is extremely complex and tricky, and thus leads to its time-consuming nature, which is one of the important causes that increases the cost and labor for the development of a self-mixing sensor. There have been many methods reported for the $ C $ estimation, but they are very time consuming, very sensitive to noise, or can only work in a certain feedback regime. This paper presents a novel approach to the $ C $ estimation, which is straightforward and can work for all feedback regimes including weak, moderate, and strong. The estimation precision of the proposed method is not only comparable to that of the data fitting technique but also much simpler.

© 2020 Optical Society of America

Joint estimation of self-mixing interferometry parameters and displacement reconstruction based on local normalization

Jin-Hyok Kim, Chol-Hyon Kim, Tu-Hon Yun, Hui-Sung Hong, Kwang-Myong Ho, and Kwang-Ho Kim
Appl. Opt. 60(8) 2282-2287 (2021)

Evaluation method for the optical feedback factor and linewidth enhancement factor using phase discontinuities in self-mixing interferometry signals

Chol-Yong Ri, Chol-Su Kim, Guk-Chol Ri, Jong-Chol Kang, Chol-Min Pak, and Jin-Myong O
Appl. Opt. 59(3) 687-693 (2020)

Normalization-free displacement reconstruction method based on fringe scaling

Hui-Song Hong, Chol-Hyon Kim, Jin-Hyok Kim, Chong-Hyok Kim, and Chung-Rok Ri
Appl. Opt. 61(7) 1600-1605 (2022)

Classification of laser self-mixing interferometric signal under moderate feedback

Olivier D. Bernal, Usman Zabit, and Thierry Bosch
Appl. Opt. 53(4) 702-708 (2014)

Vibration reconstruction and optical feedback parameter evaluation based on the direction discrimination in self-mixing interferometry

Chol-Yong Ri, Jin-Hyok Choe, Hwa-Ryong Ri, Chol-Min Pak, Kyong-Rim Ri, and Jin-Myong O
Appl. Opt. 60(13) 3801-3807 (2021)