Influence of Surface Roughness on The Specular Reflectance of Low Gloss Coatings Using Bidirectional Reflectance Measurements

Abstract

The objective of this study was to determine the effects of surface roughness and incident angle on the reflectance of low gloss coatings at grazing incidence. A specular peak has been identified from the forward scatter at longer wavelengths, 3.39 μm and 10.6 μm, for various painted surfaces. Depending on the surface roughness and wavelength, this specular component occurs at different angles. However, this effect has not been observed in the visible region. Material surfaces with well characterized surface roughness have been measured at a wavelength of 0.633 μm in an attempt to observe this effect in the visible region. The angle at which it was observed for various roughnesses has been obtained using bidirectional reflectance distribution function (BRDF) measurements.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2006
Accession Number
ADA464906

Entities

People

  • Lisa M. Farrier

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Aircrafts
  • Angle Of Incidence
  • Detectors
  • Distribution Functions
  • Geometry
  • Grazing Angles
  • Manufacturing
  • Materials
  • Materials Science
  • Measurement
  • Measuring Instruments
  • Military Aircraft
  • Reflectance
  • Roughness
  • Surface Properties
  • Surface Roughness

Fields of Study

  • Physics

Readers

  • Spectroscopy.