title: Real-time absorption and scattering characterization of slab-shaped turbid samples obtained by a combination of angular and spatially resolved measurements.
abstract: We present a fast and accurate method for real-time determination of the absorption coefficient, the scattering coefficient, and the anisotropy factor of thin turbid samples by using simple continuous-wave noncoherent light sources. The three optical properties are extracted from recordings of angularly resolved transmittance in addition to spatially resolved diffuse reflectance and transmittance. The applied multivariate calibration and prediction techniques are based on multiple polynomial regression in combination with a Newton--Raphson algorithm. The numerical test results based on Monte Carlo simulations showed mean prediction errors of approximately 0.5% for all three optical properties within ranges typical for biological media. Preliminary experimental results are also presented yielding errors of approximately 5%. Thus the presented methods show a substantial potential for simultaneous absorption and scattering characterization of turbid media.
authors.affiliation: Department of Physics, Lund Institute of Technology, P.O. Box 118, SE-22100 Lund, Sweden.
authors.forename: Jan S
authors.initials: JS
authors.lastname: Dam
authors.forename: Nazila
authors.initials: N
authors.lastname: Yavari
authors.forename: Søren
authors.initials: S
authors.lastname: Sørensen
authors.forename: Stefan
authors.initials: S
authors.lastname: Andersson-Engels
mesh_terms: D000042:Absorption; D000465:Algorithms; D000818:Animals; D045424:Complex Mixtures / Q000032:analysis* / Q000737:chemistry*; D003198:Computer Simulation; D003199:Computer Systems; D008892:Milk / Q000737:chemistry; D008956:Models, Chemical; D015233:Models, Statistical; D009010:Monte Carlo Method; D009391:Nephelometry and Turbidimetry / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D012212:Rheology / Q000379:methods*; D012542:Scattering, Radiation
chemical_list: D045424:Complex Mixtures