数字散斑干涉测量流体温度场中的图象处理方法  

Image Processing Method in the Measurement of Fluid Temperature Distribution Using DSPI

作　　者：张卫[1] 宋耀祖[1] 姚雪丰 

机构地区：[1]清华大学,北京100084

出　　处：《测试技术学报》1998年第3期76-81,共6页Journal of Test and Measurement Technology

摘　　要：本文介绍了一种适用于数字散斑干涉测量流体温度场的计算机图象处理方法,主要介绍了以傅立叶变换为基础的低通滤波法在去除散斑图象噪声中的应用。从而提高了散斑干涉图的信噪比,获得了与光学干涉相似的干涉图象。将此法运用于酒精灯火焰散斑干涉图的后续处理上,取得了较好的效果,具有较高的运行效率。研究表明,该技术在利用数字散斑干涉测量流体温度场中具有一定的实际应用价值。In this paper, a new image processing method of digital speckle interferogram is presented, which is based on FFT and low-passed filter in the spatial frequency domain. This method improves the signal-to-noise ratio of speckle interferogram and can get the same image as traditional optical interferogram. A speckle interferogram of alcohol lamp flame is processed as a typical case using this method and a preferable result is achieved which indicates that this method is practical and valuable in the measurement of fluid temperature distribution using DSPI.

关 键 词：数字散斑干涉 图象处理 流体温度场 测量 

分 类 号：TH744.3[机械工程—光学工程] TP391.41[机械工程—仪器科学与技术]