Patent ID: 6078833
Filing Date: 2000-06-20
Classification: A61B,G01N

Abstract:
The method of determining parameters of a medium which comprises the steps of:passing a first portion of light from a first light source through said medium to a first detector, and passing a second portion of light from said first light source through said medium to a second detector;passing a third portion of light from a second light source through said medium to the second detector, the distance between said first light source and said first detector and the second light source and said second detector being substantially equal, and passing a fourth portion of light from said second light source through said medium to said first detector, the distance between said first light source and the second detector and the second light source and said first detector being substantially equal; andcombining data received by said detectors in a manner that is substantially independent of: intensity of the light sources, sensitivity of the detectors, coupling efficiency of light from the light sources into said medium, and coupling efficiency of light from said medium to said detectors; and determining a parameter of said medium from said data, said light portions being of substantially identical wavelength.