Optics: measuring and testing – For light transmission or absorption – By comparison
Reexamination Certificate
2008-05-20
2008-05-20
Lauchman, Layla G. (Department: 2877)
Optics: measuring and testing
For light transmission or absorption
By comparison
C356S432000, C356S445000
Reexamination Certificate
active
07375813
ABSTRACT:
A system for measuring light absorption levels for a liquid for use in a printing system includes a light source adapted to provide a divergent beam of light, a liquid container with a hole that acts as a focusing lens, and a prism disposed over the hole to split the divergent beam of light into a reference beam and a measurement beam. The systems include a measurement detector to measure the intensity of the focused beam to produce a liquid measurement signal. A reference detector measures the intensity of the reference beam for compensating the effects of temperature and light source variations on the system signals. A device calculates signal ratios and stores the ratios so that the signal ratios of subsequent colored liquids can be converted into colorant concentrations from a look-up table or through calculations using a signal ratio/colorant concentration.
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Kauffman Robert E.
Wolf James D.
Eastman Kodak Company
Lauchman Layla G.
Valentin II Juan D
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