Injected current reshaping in distance measurement by laser self-mixing interferometry

被引：22

作者：

Kou, Ke ^{[1
]}

Li, Xingfei ^{[1
]}

Li, Li ^{[1
]}

Xiang, Hongbiao ^{[2
]}

机构：

[1] Tianjin Univ, State Key Lab Precis Measuring Technol & Instrume, Tianjin 300072, Peoples R China

[2] Tianjin Univ Technol, Sch Mech Engn, Tianjin 300384, Peoples R China

来源：

APPLIED OPTICS | 2014年 / 53卷 / 27期

基金：

中国国家自然科学基金;

关键词：

RANGE FINDER; INTERFERENCE; DEPENDENCE; GAAS;

D O I：

10.1364/AO.53.006280

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Self-mixing interferometry (SMI), as an extremely simple and compact laser range finding technique, is especially appropriate to develop minitype sensors for narrow space and small precision parts. In order to enhance the distance resolution performance of this technique, we described the mechanism of nonlinearity in laser frequency under injected current tuning, and proposed a current reshaping method to linearize the laser frequency to attain higher resolution in the scheme of SMI. The proof of nonlinearity was obtained through numerical simulation by considering the change of temperature and carrier concentration and experiment by complex wavelet analysis. The current reshaping method, based on the experimental data of wavelength versus injected current, was proposed to suppress the nonlinearity and improve the distance resolution to better than 20 mu m over the range of 2.4-20.4 cm. The influence of tuning parameters and other sources of error was discussed additionally. (C) 2014 Optical Society of America

引用

页码：6280 / 6286

页数：7

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