Abstract. A digital method is proposed whereby spatial speckles created when an optically rough surface is illuminated by a diffuse coherent laser beam are used to generate slope contour fringes. This is done by photographing the speckles contained in a parallel plane in front of the plate before and after deformation. The resulting photographs are then fast Fourier transformed twice and numerically compared with the digital speckle correlation software called computer-aided speckle interferometry to produce slope contours of the plate. The slope contour data are then stored in a computational array. The curvature contours are generated by numerical differentiation of the slope data; similarly, the deflection contours are generated by numerical integration of the slope data. The curvature data can then be further used in conjunction with plate theory to obtain the bending and twisting moments the plates experience as well as the stress distribution in the surface of the plate. The method is simple and straight forward. A comparison with several other techniques is presented.

中文翻译：

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用于产生弯曲板的偏转、斜率和曲率轮廓的数字激光散斑技术

摘要。提出了一种数字方法，其中使用漫射相干激光束照射光学粗糙表面时产生的空间散斑来生成斜面轮廓条纹。这是通过拍摄变形前后板前平行平面中包含的斑点来完成的。然后将生成的照片快速傅立叶变换两次，并与称为计算机辅助散斑干涉测量法的数字散斑相关软件进行数值比较，以产生板的斜率轮廓。然后将坡度轮廓数据存储在计算阵列中。曲率等高线由坡度数据的数值微分生成；类似地，偏转等值线是通过斜率数据的数值积分生成的。然后，曲率数据可以进一步与板理论结合使用，以获得板所经历的弯矩和扭转力矩以及板表面的应力分布。该方法简单明了。介绍了与其他几种技术的比较。