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.
© 1995 Optical Society of America
Original Manuscript: April 5, 1994
Revised Manuscript: September 8, 1994
Published: May 1, 1995
Lihong Wang and Steven L. Jacques, "Use of a laser beam with an oblique angle of incidence to measure the reduced scattering coefficient of a turbid medium," Appl. Opt. 34, 2362-2366 (1995)