Determination of Hurst exponent by optical signal processing applied on surface roughness measurements

José Antonio Marbán Salgado; Oscar Sarmiento Martínez; Darwin Mayorga Cruz; Jorge Uruchurtu Chavarín

doi:10.1117/12.845799

3 December 2009 Determination of Hurst exponent by optical signal processing applied on surface roughness measurements

José Antonio Marbán Salgado, Oscar Sarmiento Martínez, Darwin Mayorga Cruz, Jorge Uruchurtu Chavarín

Proceedings Volume 7499, Seventh Symposium Optics in Industry; 749909 (2009) https://doi.org/10.1117/12.845799
Event: Seventh Symposium on Optics in Industry, 2009, Guadalajara, Jalisco, Mexico

Abstract

In this work a surface roughness measurement performed by Hurst exponent determination, calculated at the same time from data processing of an optical reflected signal is presented. An industrial plate roller rod covered with a polymeric coating is illuminated using a laser source. A lens is used for casting the scattered light reflected from several sectors of the plate roller, and also to focus it into a power meter connected to a computer where corresponding data series are stored. Information related to specific points of the considered object is contained into the optical reflected signal and post-processing of related data signal series allows calculation of the Hurst exponent, also known as roughness exponent. A wear analysis on considered surface sectors of the roller is performed and as a result a relation between Hurst exponent and the coating thickness for each surface sector is clearly established. The simplicity of the opto-mechanical setup among other evident advantages may suggest the application of this non-destructive technique on surface metrology.

Citation Download Citation

José Antonio Marbán Salgado, Oscar Sarmiento Martínez, Darwin Mayorga Cruz, and Jorge Uruchurtu Chavarín "Determination of Hurst exponent by optical signal processing applied on surface roughness measurements", Proc. SPIE 7499, Seventh Symposium Optics in Industry, 749909 (3 December 2009); https://doi.org/10.1117/12.845799

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