Use of a laser beam with an oblique angle of incidence to measure the reduced scattering coefficient of a turbid medium

Lihong Wang, Steven Jacques

Research output: Contribution to journalArticle

178 Scopus citations

Abstract

A simple and quick approach is used to measure the reduced scattering coefficient (µs') of a semi-infinite turbid medium having a much smaller absorption coefficient than µs'. A laser beam with an oblique angle of incidence to the medium causes the center of the diffuse reflectance that is several transport mean-free paths away from the incident point to shift away from the point of incidence by an amount ?x. This amount is used to compute µs' by µs' = sin(ai)/(n?x), where n is the refractive index of the turbid medium divided by that of the incident medium and ai is the angle of incidence measured from the surface normal. For a turbid medium having an absorption coefficient comparable with µs', a revision to the above formula is made. This method is tested theoretically by Monte Carlo simulations and experimentally by a video reflectometer.

Original languageEnglish (US)
Pages (from-to)2362-2366
Number of pages5
JournalApplied Optics
Volume34
Issue number13
DOIs
StatePublished - May 1 1995
Externally publishedYes

Keywords

  • Optical properties
  • Scattering coefficient
  • Scattering media
  • Tissue optics
  • Turbid media

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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