Patent ID: 6233053
Filing Date: 2001-05-15
Classification: G01N

Abstract:
A dual standard gloss sensor for optically measuring the gloss of a sample surface comprising:a first source of light;a first optical fiber for transmitting a light beam having a first modulation frequency from said source of light;a first collimator for receiving the light beam to form a collimated light beam which strikes the paper sample at a first angle;a second optical fiber for transmitting a light beam having a second modulation frequency from said source of light;a second collimator for receiving the light beam to form a collimated light beam which strikes the paper sample at a second angle;a first collimator-detector for receiving said first light beam and creating a first gloss signal;a second collimator-detector for receiving said second light beam and creating a second gloss signal;third an fourth optical fibers for receiving a beam of light from said source of light and passing the beams directly to a third and fourth collimator-detector, the third beam of light being modulated at the first frequency, and the fourth beams of light being modulated by the second frequency;first signal correction means for correcting the first gloss signal with first reference signal to create a first corrected gloss signal; andsecond signal correction means for correcting the second gloss signal with the second reference signal to create a second corrected gloss signal.