Diffuse Reflectance and Transmittance Measurements Using a STAR GEM

Four methods, a goniometer, integrating sphere, conical mirror and biconical mirror methods, for the measurement of the diffuse reflectance and transmittance are described and compared. These have been in use for a number of years. A STAR GEM, which has been recently developed in AIST, belongs to the category of the biconical mirror. The disadvantage of the… (More)