基于双调制技术的自混合干涉测量法用于绝对距离测量。

Self-mixing interferometry based on a double-modulation technique for absolute distance measurement.

作者信息

Guo Dongmei, Wang Ming

机构信息

Jiangsu Key Lab on Opto-Electronic Technology, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210097, China.

出版信息

Appl Opt. 2007 Mar 20;46(9):1486-91. doi: 10.1364/ao.46.001486.

DOI:10.1364/ao.46.001486

PMID:17334440

Abstract

A new, to the best of our knowledge, method for the measurement of the absolute distance of a remote target based on the laser diode self-mixing interferometry is presented. A double-modulation technique is introduced to improve the measurement resolution. Wavelength modulation of the laser beam is obtained by modulating the injection current of the laser diode. Phase modulation of the laser beam is obtained by an electro-optic crystal in the external cavity. Absolute distance of the external target is determined by the Fourier analysis method. Theoretical analysis and numerical simulations are given. Experimental results show that a resolution of +/-0.3 mm can be achieved for absolute distance ranging from 277 to 477 mm.

摘要

据我们所知，提出了一种基于激光二极管自混合干涉测量远程目标绝对距离的新方法。引入了双调制技术以提高测量分辨率。通过调制激光二极管的注入电流来实现激光束的波长调制。通过外腔中的电光晶体来实现激光束的相位调制。外部目标的绝对距离由傅里叶分析方法确定。给出了理论分析和数值模拟。实验结果表明，对于277至477毫米的绝对距离范围，可实现±0.3毫米的分辨率。