Self-mixing interferometry based on a double-modulation technique for absolute distance measurement
Self-mixing interferometry based on a double-modulation technique for absolute distance measurement
复制标题
基于双调制技术的自混合干涉绝对距离测量
DOI：
10.1364/ao.46.001486
复制
发表时间：
2007-03-20
期刊：
影响因子：
1.9
通讯作者：
Wang, Ming
中科院分区：
文献类型：
--
作者：
Guo, Dongmei;Wang, Ming
提出了一种基于激光二极管自混合干涉术的遥测目标绝对距离的新方法。为了提高测量分辨率，采用了双调制技术。通过对激光二极管的注入电流进行调制，得到了激光的波长调制。激光光束的相位调制是通过外腔中的电光晶体获得的。利用傅里叶分析方法确定目标的绝对距离。给出了理论分析和数值模拟。实验结果表明，在277~477 mm的绝对距离范围内，分辨率可达+/-0.3 mm。(C)2007年美国光学学会。
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. (c) 2007 Optical Society of America.