Coburn D, Slevin J
Appl Opt. 1995 Sep 10;34(26):5977-86. doi: 10.1364/AO.34.005977.
We report on the development of an automated digital speckle system for use in the nondestructive testing of thermally stressed ceramics. The system is based on a laser-speckle technique known as speckle-pattern correlation and uses a CCD camera and a microcomputer to allow real-time testing of the ceramic samples. This arrangement makes use of decorrelation in the laser speckle image structure, which results from microstructural changes in the surface topology, to probe for surface defects on the thermally stressed materials. Acorrelation tracking procedure was used to allow corrections to be made to the correlation signal arising from bulk motion of the sample. Results are presented that demonstrate the capability of the correlator for distinguishing between ceramic components on the basis of their response to thermal loading.
我们报告了一种用于热应力陶瓷无损检测的自动化数字散斑系统的开发情况。该系统基于一种称为散斑图案相关性的激光散斑技术，并使用电荷耦合器件（CCD）相机和微型计算机对陶瓷样品进行实时检测。这种配置利用了激光散斑图像结构中的去相关性，这种去相关性是由表面拓扑结构的微观结构变化引起的，用于探测热应力材料上的表面缺陷。采用相关跟踪程序对样品整体运动产生的相关信号进行校正。给出的结果表明了相关器能够根据陶瓷部件对热负荷的响应来区分它们。
