Densitometer zur Messung des Spiegelreflexionsvermögens.

摘要

An infrared densitometer which measures the reduction in the specular component of reflectivity as marking particles are progressively deposited on a moving photoconductive belt (10). Collimated light rays are projected onto the marking particles. The light rays reflected from at least the marking particles are collected and directed onto a photodiode array (106). The photodiode array generates electrical signals proportional to the total flux (122, 124) and the diffuse component (124) of the total flux of the reflected light rays. Circuitry (107) compares the electrical signals and determines the difference therebetween to generate an electrical signal proportional to the specular component (122) of the total flux of the reflected light rays.