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Superficies y vacío
versão impressa ISSN 1665-3521
Superf. vacío vol.23 no.2 Ciudad de México Jun. 2010
Analysis of masking effect on laser light scattering from unidirectional and isotropic machined surfaces
Juan de Dios OrtizAlvarado and Jorge A. HuertaRuelas
Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Instituto Politécnico Nacional Laboratorio de Metrología Óptica Cerro Blanco 141 Colinas del Cimatario C.P. 76090 Querétaro, Querétaro México.
Recibido: 19 de marzo de 2009.
Aceptado: 4 de mayo de 2010.
Abstract
An experimental study of masking effect on laser light scattering from machined surfaces is described. The results indicate that asperity distribution on rough surfaces is an implied factor on masking effect in addition to roughness and RMS slope. The masking effect was monitored on light scattering from isotropic and unidirectional rough surfaces. The masking effect characterized in isotropic rough surfaces agrees with the shadowingmasking function defined by B.G. Smith [IEEE Trans. Ant. and Prop. 15 668 (1967)]. We propose a new expression defined to describe masking effect on light scattering from unidirectional machined surfaces. This function was verified by comparing with experimental data. The results and the function proposed, are useful in implementing laser light scattering instruments for online monitoring of surface processes which produce unidirectional surface patterns (such as turning, milling, grinding, and some cases of extrusion, lithography and thin film growth), where geometrical setup requires large incidence angle.
Keywords: Laser light scattering; Surface roughness; Shadowing effect; Masking effect; Optical roughness meter.
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Acknowledgements
This work was supported by CONACYT under project SEP2004C0147938. Authors acknowledge to Arturo Moreno Baez with his help to implement mechanical positioning system. Also, it is recognized a fruitful discussions with Ph.D. Gerardo Miramontes de León and Ph.D. Ivan Dominguez López.
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