光学精密工程2018，Vol.26Issue(4)：807-815,9.DOI:10.3788/OPE.20182604.0807
基于M-Z干涉光路的光学目标探测
Optical target recognition based on optical path of Mach-Zehnder interferometric
摘要
Abstract
A new method has been proposed to improve the detection and recognition of optical targets using a laser active detection system.T he proposed method uses the scanning interference field to transform the spatial distribution of the target into the time distribution of the detected light,and uses the characteristics of the time distribution of the reflected light for identifying optical targets in a com-plex background.Expressions giving the optical path difference of coherent beams at any point in the far-field interference light field based on the principle of the Mach-Zehnder interferometer,and the fringe spacing in the interference pattern are obtained.The influence of the fringe spacing in the inter-ference pattern on the time distribution of the light intensity at the point of reflection onthe original target was analyzed.The results revealed that a decrease in the fringe spacing,while causing an in-crease in the number of peaks in the time distribution of light reflected from the optical target and a decrease in the peak ratio,resulted in no significant change in the time distribution of light reflected from the diffuse background The variance,skewness,and kurtosis of the time distribution of light re-flected from the diffuse backgroundand optical target are evidently different.For example,we have observed kurtosis values of 4.37,4.03,3.91,and 62.8,34.97,35.4,respectively,for the two time distributions,reflecting an overall difference of one order of magnitude.The results indicate that the large differences in the time distribution of reflected light,envelope shape,and statistical characteris-tics can be used to easily distinguish between the optical target and diffuse background.关键词
激光主动探测/相干探测/马赫-曾德尔干涉/光学目标/漫反射Key words
laser active detection/coherent detection/Mach-Zehnder interferometer/optical target/diffuse reflection分类
信息技术与安全科学引用本文复制引用
单聪淼,孙华燕,赵延仲,陈剑彪,任建迎..基于M-Z干涉光路的光学目标探测[J].光学精密工程,2018,26(4):807-815,9.基金项目
国家重点研发计划专项(No.2017YFC0822700) （No.2017YFC0822700）
