A colorimeter comprises a light source, a mixing box formed of non-coated light diffusing surface manufactured by molding sintering white ceramics or white resin for diffusing and reflecting light from the light source to guide the same to a sample, first light receiving means for receiving light reflected...http://www.google.es/patents/US4995727?utm_source=gb-gplus-sharePatente US4995727 - Compact diffusion light mixing box and colorimeter
Compact diffusion light mixing box and colorimeter
