Method and apparatus for measuring concentration of absorptive constituent in scattering medium

摘要

A method for measuring a concentration of an absorptive constituent in a scattering medium comprises the steps of emitting of light having two or more predetermined wavelengths; making said light incident at a light incidence position into said scattering medium; detecting said light at one or more photodetection points to acquire one or more photodetection signals; detecting light quantities and average flight pathlengths for said respective wavelengths of light based on said signals; and obtaining a concentration of said absorptive constituent by arithmetic processing using said light quantities and average flight pathlengths based on a predetermined relationship. The method permits absolute-value measurement of the concentration of the absorptive constituent inside the scattering medium having various exterior shapes.