混合层流动细光束成像变形定量特性研究  

Investigation on Distortion of Small Light Beam Image Passing through Compressible Mixing Layer

作　　者：甘才俊[1] 李烺[1] 马汉东[1] 熊红亮[1] 

机构地区：[1]中国航天空气动力技术研究院,北京100074

出　　处：《光电工程》2012年第12期32-36,共5页Opto-Electronic Engineering

基　　金：科技部973计划资助项目(2009CB724105)

摘　　要：为了研究是否可以通过提高光学仪器放大率来提高细光束畸变图像的分辨率问题,讨论了穿越可压缩混合层后细光束成像的变形特性。本研究先利用CCD相机成像系统获得细光束畸变的实验图像,再利用二维双正交小波变换和Canny边缘检测技术对这些图像进行后处理。分析结果表明:这两项后处理技术可清晰识别出细光束图像的边缘。此外研究还发现:从衡量光学仪器分辨率角度而言,细光束畸变图像的面积比周长能更好地反映图像的变形特点。In order to investigate the problem whether resolving power for aberration image of light beam can be improved by increasing the amplification ratio of optical device, the shape distortion of small light beam passing through compressible mixing layer has been researched. The experimental aberration image of small light beam has been obtained using CCD camera imaging system, then a two-dimensional biorthogonal wavelet transform and Canny edge test technique have also been adopted to treat with the aberration image. Using these techniques, the edge of zero-order diffraction spot has been identified clearly. In addition, comparing perimeter of beam with its area, it is more suitable for using area to describe image distortion than for its perimeter.

关 键 词：气动光学效应 可压缩混合层 二维小波变换 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]