Patent ID: 8259294

Claim:
A method for measuring optical parameters of transparent, scattering measurement objects, comprising the following method steps: illuminating a transparent, scattering measurement object with diffuse light by an illumination source having a light exit opening, wherein a component of the diffuse light in a radiation direction directed from the light exit opening onto the measurement object is suppressed, wherein a integrating sphere having a highly reflective and diffusely scattering inner surface is used as the illumination source, having a light source arranged in an interior of the integrating sphere and a light exit opening apart from said light source, such that no light from the light source passes directly through the light exit opening, and wherein said light proportion in one radiation direction is suppressed by an active light trap arranged in the inner surface of the integrating sphere, detecting light from the illumination source that has passed through the measurement object by two photodetectors directed toward the light exit opening from directions deviating from one another, wherein the photodetectors detect simultaneously, said light trap having a position and direction such that in the direction of one of the two photodectors no light component emerges from the light exit opening, determining diffuse transmission T diffuse of the measurement object from a ratio of light intensity of the light scattered in the measurement object and detected by the first photodetector and the known light intensity of the light incident on the measurement object, and determining the total transmission T total of the measurement object from a ratio of light intensity of light that has passed through the measurement object and been detected by a second photodetector of a total transmission channel, of the photodetectors and the known light intensity of the light incident from the measurement object.