数字散斑相关法测量连续位移的原理与实验

Principle and Experiment of Digital Speckle Autocorrelation Measuring Seriate Displacement

提出用数字散斑相关方法测量移动物体的连续位移.激光照射粗糙表面形成散斑场,用CCD记录粗糙表面移动时的序列散斑图像,利用数字散斑相关方法分析散斑图像,确定粗糙表面的位移.研究结果表明,数字散斑相关技术可以高精度地测出连续移动物体的位移.

The digital speckle autocorrelation function is presented to measure seriate displacement of moving object. A series of speckle patterns are shot by CCD camera when laser irradiates the rough surface of a moving object. Based on the digital speckle autocorrelation method, these speckle patterns are analyzed, and the displacement of the objects is determined. The result of experiment indicates that digital speckle autocorrelation is capable of measuring the seriate displacement accurately.