Patent ID: 6437861
Filing Date: 2002-08-20
Classification: G01J

Abstract:
A light integrating interface for use in a radiometer, the interface comprising:(a) an integrating cavity; (b) a light energy input port having an input longitudinal axis and operatively coupled to the integrating cavity; (c) a light energy output port having an output longitudinal axis and operatively coupled to the integrating cavity; (d) wherein the integrating cavity is non-spherical and comprises a reflective inner surface; (e) wherein the input port longitudinal axis lies in a first plane and wherein the output port longitudinal axis lies in a second plane, and wherein the first plane is substantially parallel to and displaced from the second plane such that light energy entering the integrating cavity through the input port interacts with the inner surface at least twice before exiting the integrating cavity through the output port; and (f) wherein the input port longitudinal axis and the output port longitudinal axis are substantially perpendicular to the longitudinal axis of the integrating cavity.