Determination of parameters of substances in media, especially oxygen saturation in living tissues, comprises using model function to take account of both back scattered and reflected light

摘要

Determination of parameters of substances in media comprises illuminating the medium, spectrally resolving the reflected and backscattered light, and approximating the amount of reflected and backscattered light by a model function that includes both the amount of light backscattered by the medium without fully penetrating the medium and the amount of light reflected by a background and fully transmitted through the medium. An Independent claim is also included for an arrangement for performing the determination, comprising an illuminated slit and an optical system, including a pivotable mirror, that creates an image in the form of a series of strips behind the eye and confocally transmits the light reflected or backscattered by the strips to the entrance slit of a polychromator, the output from which, corresponding to sequentially illuminated and scanned strips, is connected via a detector to a computer.