Acta Optica Sinica, Volume. 31, Issue 4, 412006(2011)
Surface Roughness Measurement Based on Dichromatic Digital Speckle Correlation
Based on the spectral-speckle correlation method with ensemble average, dichromatic digital speckle correlation method is introduced to measure the surface roughness. The properties of dichromatic speckle spatial correlation parameter are investigated through simulated speckle fields. And the location relation of sample and target areas is also studied. Window size influence in digital image process on peak value of spatial correlation is experimentally discussed. The surface roughness of blasted-shot and grinding specimen is measured. It is shown that dichromatic speckle spatial correlation parameter can describe surface roughness effectively. The new method has the virtue of fast image acquisition and good stability.
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Liu Hengbiao, Zhou Yajie, Wang Changling. Surface Roughness Measurement Based on Dichromatic Digital Speckle Correlation[J]. Acta Optica Sinica, 2011, 31(4): 412006
Category: Instrumentation, Measurement and Metrology
Received: Aug. 2, 2010
Accepted: --
Published Online: Mar. 30, 2011
The Author Email: Hengbiao Liu (liuhb62@tongji.edu.cn)