High-Precision Laser Self-Mixing Displacement Sensor Based on Orthogonal Signal Phase Multiplication Technique

被引：1

作者：

Wang, Xiulin ^{[1
]}

Zhong, Zhengjian ^{[2
]}

Chen, Hanqiao ^{[2
]}

Zhu, Desheng ^{[2
]}

Zheng, Tongchang ^{[1
]}

Huang, Wencai ^{[2
]}

机构：

[1] Jimei Univ, Dept Phys, Xiamen 361021, Peoples R China

[2] Xiamen Univ, Dept Elect Engn, Xiamen 361005, Peoples R China

来源：

PHOTONICS | 2023年 / 10卷 / 05期

基金：

中国国家自然科学基金;

关键词：

phase modulation; phase multiplication; self-mixing interference; micro-displacement reconstruction; ABSOLUTE DISTANCE; INTERFEROMETER; FEEDBACK; INTERFERENCE; DIODE; RANGE;

D O I：

10.3390/photonics10050575

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A new signal processing method named orthogonal signal phase multiplication (OSPM) is proposed, which is used to improve the precision of vibration measurement in a phase-modulating self-mixing interferometer (SMI). The modulated signal is acquired by an electro-optic modulator, which is placed in the external cavity. Higher measurement precision is realized by performing the phase multiplication algorithm on the orthogonal signals extracted from the harmonic components of the signal spectrum. Theoretically, the displacement reconstruction precision of OSPM is higher than that of conventional modulation methods, and it can be continuously improved by increasing the multiplication times. The feasibility and performance of the proposed method are verified by simulated signals and confirmed by experiments; the absolute error is less than 11 nm, and relative error is less than 0.75%, within the amplitude range from 661 nm to 2013 nm. This method does not involve additional optical elements, and its effectiveness meet the requirements for real-time high-precision measurements.

引用

页数：10

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