MIRROR-ATTENUATOR-MOSAIC DIFFUSER PERFORMANCE

The diffuse radiance outgoing from mirror-attenuator-mosaic diffusers is with in certain limits independent from the angle of the incident l ight. Such diffusers are useful as calibration sources for the Scanner for Radiation Budget radiometer and for similar purposes as well. Two techniques of production of directional diffusers (etching and diamon d drilling) are compared. To measure the performance of the samples, a new measurement setup is introduced that permits the direct compariso n of incoming and outgoing light with an accuracy of better than 0.5%. The diamond drilling technique shows a much better performance than t he etching.