APPARATUS AND METHOD FOR DIRECT MEASUREMENT OF ABSORPTION AND SCATTERING COEFFICIENTS IN SITU

摘要

An apparatus for measuring an absorption coefficient includes a first diffusive material, a second diffusive material inside the first diffusive material separated from the first diffusive material by a cavity, and a transparent material proximate to an inner surface of the second diffusive material that holds an attenuating material. First and second light detectors measure light intensities in the cavity and the transparent material respectively. An absorption coefficient for the attenuating material may be determined based on the first and second light intensities measured when the cavity is illuminated by a light source. A scattering coefficient for the attenuating material may be determined based on a third diffused light intensity measured by the second light detectors in the second diffusive medium measured when the attenuating material is illuminated by a light source.