Instrument to measure the bidirectional reflectance distribution function of surfaces

Kenneth J. Voss, Albert Chapin, Marco Monti, Hao Zhang

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

A new instrument to measure the in situ bidirectional reflectance distribution function (BRDF) of surfaces is described. This instrument measures the BRDF for eight illumination angles from 0 to 65 deg, three colors (475, 570, and 658 nm), and at over 100 selected viewing angles. The viewing zenith angles range from 5 to 65 deg, and the azimuth angles, relative to the illumination direction, range from 0 to ±180 deg. Many tests of the system have been run and show that for flat surfaces the BRDF of a sample surface can be measured with a precision of 1-5% and an accuracy of 10% of the measured reflectance. The BRDF for a dry and wet sand sample is presented as a demonstration of the instrument.

Original languageEnglish (US)
Pages (from-to)6197-6206
Number of pages10
JournalApplied Optics
Volume39
Issue number33
DOIs
StatePublished - Nov 20 2000

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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