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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 33 — Nov. 20, 2001
  • pp: 6072–6080

Width of the specular peak perpendicular to the principal plane for rough surfaces

Gerhard Meister, André Rothkirch, Hartwig Spitzer, and Johann Bienlein  »View Author Affiliations


Applied Optics, Vol. 40, Issue 33, pp. 6072-6080 (2001)
http://dx.doi.org/10.1364/AO.40.006072


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Abstract

The bidirectional reflectance distribution function (BRDF) model developed by Torrance and Sparrow [J. Opt. Soc. Am. 57, 1105–1114 (1967)] is used to describe the specular reflection of rough surfaces. We compare this model with the BRDF measurements of four manmade surfaces with different roughnesses. The model can be used to describe the basic features of the measured BRDFs. We found that the width of the specular peak perpendicular to the principal plane decreases strongly with an increasing illumination zenith angle in the data as well as in the model. A model analysis shows that the width is approximately proportional to the cosine of the illumination angle θ i , and the deviations are determined by the roughness of the surface. This relationship is accompanied by an increase in reflectance in the specular direction in the principal plane that is 1/cos θ i stronger than the increase for a perfectly smooth surface.

© 2001 Optical Society of America

OCIS Codes
(120.5700) Instrumentation, measurement, and metrology : Reflection
(150.0150) Machine vision : Machine vision
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(290.5880) Scattering : Scattering, rough surfaces

History
Original Manuscript: December 13, 2000
Revised Manuscript: June 20, 2001
Published: November 20, 2001

Citation
Gerhard Meister, André Rothkirch, Hartwig Spitzer, and Johann Bienlein, "Width of the specular peak perpendicular to the principal plane for rough surfaces," Appl. Opt. 40, 6072-6080 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-33-6072


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