Patent ID: 6404502
Filing Date: 2002-06-11
Classification: G01N

Abstract:
A dual standard gloss sensor for optically measuring the gloss of a sample surface comprising:a light beam source; first means for directing an incident light beam from the light beam source to the sample surface at a first angle; second means for directing an incident light beam from the light beam source to the sample surface at a second angle; first reflectance sensing means positioned to measure the intensity of the light beam reflected from the sample surface at said first angle; second reflectance sensing means positioned to measure the intensity of the light beam reflected from the sample surface at said second angle; means for directing one or more reference light beams, wherein the incident light beams and at least one reference light beam are directed at the same time; and at least a third reflectance sensing means positioned to measure the intensity of the one or more reference light beams, wherein at least one of the one or more reference light beams passes directly to the third reflectance sensing means to provide a reference of the light beam source's intensity.