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WHOLE-FIELD DETERMINATION OF SURFACE ROUGHNESS BY SPECKLE CORRELATION

机译：斑点相关法全貌测定表面粗糙度

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A whole-field method of double-exposure speckle photography is employed to determine metal surface roughness by correlation between two speckle patterns. A movable rectangular aperture that is mounted before an image lens is shifted between the exposures, which results in a decrease in the contrast of the reconstructed Young's fringes with increasing roughness. The technique permits evaluation of the roughness of particular points on a surface as well as the average roughness of an entire surface. Four sets of random surfaces that were prepared by different machine-finishing processes and with roughnesses ranging from 0.6 to 13 mu m have been tested. Different methods have been carried out to process the test data, and a practical method for the evaluation of surface roughness is proposed. [References: 36]
机译：通过两次斑点图案之间的相关性，采用双曝光斑点摄影的全场方法确定金属表面的粗糙度。在图像镜头在两次曝光之间移动之前安装的可移动矩形光圈，会导致粗糙度增大，从而导致重建的杨氏条纹对比度降低。该技术允许评估表面上特定点的粗糙度以及整个表面的平均粗糙度。测试了四组随机表面，这些表面是通过不同的机器抛光工艺制成的，粗糙度范围为0.6至13微米。已经采取了不同的方法来处理测试数据，并提出了一种评估表面粗糙度的实用方法。 [参考：36]

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