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Published May 1, 1995 | Published
Journal Article Open

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


A simple and quick approach is used to measure the reduced scattering coefficient (μ_s') of a semi-infinite turbid medium having a much smaller absorption coefficient than μ_s'. 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 Δx. This amount is used to compute μ_s' by μ_s' = sin(α_i)/(nΔx), where n is the refractive index of the turbid medium divided by that of the incident medium and α_i is the angle of incidence measured from the surface normal. For a turbid medium having an absorption coefficient comparable with μ_s', a revision to the above formula is made. This method is tested theoretically by Monte Carlo simulations and experimentally by a video reflectometer.

Additional Information

© 1995 Optical Society of America. Received 5 April 1994; revised manuscript received 8 September 1994. We thank L. Eppich for proofreading the manuscript. This research was supported in part by the Whitaker Foundation, U.S. Office of Naval Research grant N00014-91-J-1354, U.S. Air Force Office of Scientific Research grant F49620-93-1-0298DEF, U.S. Department of Energy grant DE-FG05-91ER61226, and National Institutes of Health grant R29-HL45045.

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