Open AccessSensitivity of spatially-resolved diffuse reflectance to optical parameters in the hybrid diffusion approximation
Author(s) -
Hua Tian,
Niu Ping-Juan
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.184214
Subject(s) - diffuse reflection , attenuation coefficient , diffusion , optics , absorption (acoustics) , mean free path , diffuse reflectance infrared fourier transform , materials science , scattering , sensitivity (control systems) , photon diffusion , integrating sphere , light scattering , physics , chemistry , light source , thermodynamics , biochemistry , photocatalysis , electronic engineering , engineering , catalysis
Based on a theoretical model for spatial diffusion reflection with two-point-source hybrid diffusion approximate to a semi-infinite homogeneous turbid medium, expressions of the sensitivities for the absorption coefficient μa and the reduced scattering coefficient μ's are derived, and the effect of the sensitivities of the two optical parameters μa and μ's on diffuse reflectance is studied systematically in small volumes of highly absorbing medium. The results show that the sensitivity of the absorption coefficient increases approximately linearly with the increase of source-detector separation ρ, with a slope proportional to 1.4 (μ's/μa)1/4, and also indicate an optimal probe spacing ρopt at which a variable reduced scattering coefficient has a smallest effect on the measurment of optical absorption in the turbid medium. The value of ρopt is approximately equal to 3.4 times transport mean free path. The study is of great significance for the measurment of the optical properties of biological tissues and the application of diffuse reflecance spectroscopy technology.