THE DIRECTIONAL RESPONSE OF AN INTEGRATING SPHERE DETECTOR SYSTEM

This paper presents a model for the directional response of a real int egrating sphere detector system. The directional response is shown to depend on three factors: the transmittance of the entrance port, the d irectional-hemispherical reflectance of the sphere wall coating, and a factor describing the effect of topographical features on the sphere wall. Analysis of the entrance-port edge effect is provided. Experimen ts are reported that quantify these factors and verify the model for a real integrating sphere detector system that is based on an actual co mmercial integrating sphere.