Comparison of Surface Roughness Measurement in Dichromatic Speckle Patterns with Autocorrelation Method

2011 ◽  
Vol 189-193 ◽  
pp. 680-683 ◽  
Author(s):  
Zong Heng Yuan ◽  
Yan Hua Zhang ◽  
Jian Wei Zhang ◽  
Ye Fan Ge
Keyword(s):  
Surface Roughness ◽  
Autocorrelation Function ◽  
Correlation Length ◽  
High Reliability ◽  
Laser Speckle ◽  
Roughness Measurement ◽  
Elongation Ratio ◽  
Surface Roughness Measurement ◽  
Speckle Patterns ◽  
Autocorrelation Method

Applying autocorrelation method to process laser speckle patterns, the relation between surface roughness and speckle elongation and correlation length of autocorrelation function can be obtained, and the measured surface roughness can be achieved based on this relation. One-dimension autocorrelation and two-dimension autocorrelation function are used, Moreover, surface roughness is evaluated by speckle elongation and correlation length of autocorrelation function. Aspect ratio of speckle granular represents speckle elongation ratio, which eliminates effects of speckle granular average size on measurement results compared to other methods using before. It has high reliability and efficiency in surface roughness measurement evaluation.

Analysis on Combination of Different Wavelengths in Surface Roughness Measurement by Polychromatic Laser Speckle Patterns

2011 ◽  
Vol 189-193 ◽  
pp. 1978-1981
Author(s):  
Jing Huang ◽  
Jian Wei Zhang ◽  
Yan Hua Zhang ◽  
Zong Heng Yuan
Keyword(s):  
Surface Roughness ◽  
Measurement Precision ◽  
Laser Speckle ◽  
Roughness Measurement ◽  
Elongation Ratio ◽  
Measuring Process ◽  
Speckle Field ◽  
Measuring Surface ◽  
Speckle Patterns ◽  
The Difference

Based on the method of polychromatic speckle autocorrelation measuring surface roughness, this paper discussed the influence of the combination of different wavelengths on speckle patterns and speckle elongation ratio when rough surface and polychromatic speckle patterns were simulated. The results show that the smaller the difference of wavelengths combination is, the further peak of the speckle elongation ratio is from the speckle field centre, for the same surface roughness. And the wider area of speckle elongation effects extends. Therefore, influence of combination of wavelengths on measurement precision should be taken into consideration during measuring process.

Surface roughness measurement of aluminium thin film by laser speckle method

2020 ◽  
Author(s):  
R. Balamurugan ◽  
K. Rathina ◽  
A. R. Arul ◽  
S. Inbakumar ◽  
R. G. Sethuraman
Keyword(s):  
Thin Film ◽  
Surface Roughness ◽  
Laser Speckle ◽  
Roughness Measurement ◽  
Surface Roughness Measurement
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