在物面系综平均双波长散斑相关法基础上,提出了双波长数字散斑相关方法测量表面粗糙度;模拟研究了双波长散斑场空间相关参数及在两单波长散斑图像中样本子区与目标子区的位置关系;实验探讨了数字图像处理的窗口尺寸对空间相关峰值的影响;对平磨和抛喷丸表面样块的粗糙度测量实验表明,双波长散斑场空间相关参数能有效表征表面粗糙度。新的测量方法具有数据采集速度快、表征参数稳定性好的特点。 Based on the ensemble method of averaged two-wavelength speckle correlation, the two-wavelength digital speckle correlation method is proposed to measure the surface roughness. The spatial correlation parameters of the two-wavelength speckle field and the samples in two single wavelength speckle images are simulated. Sub-region and target sub-region. The experiment discussed the effect of the window size of digital image processing on the spatially correlated peak value. The roughness measurement experiments on flat and peening surface samples showed that the spatial correlation of the two-wavelength speckle field Parameters can effectively characterize the surface roughness. The new measurement method has the characteristics of fast data acquisition, good characterization parameters stability.