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

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Abstract:

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.

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Periodical:

Advanced Materials Research (Volumes 189-193)

Pages:

1978-1981

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.189-193.1978

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Online since:

February 2011

Authors:

Jing Huang, Jian Wei Zhang, Yan Hua Zhang, Zong Heng Yuan

Keywords:

Speckle Elongation, Speckle Patterns Simulation, Surface Roughness Measurement, Wavelengths Combination

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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