Sensor for water film on a plate in printing machines
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United States of America Patent
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Feb 9, 1993
Grant Date -
N/A
app pub date -
Jul 17, 1991
filing date -
Jul 17, 1990
priority date (Note) -
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Abstract
An on-plate water film sensor for printing machines uses a narrow-band light source, a photo modulator for chopping a light beam therefrom into p- and s-polarized beams, a collimator for making parallel the rays of the collimated beams with a given cross-sectional area for measurement, a wavelength plate for adjusting the wavefront of the parallel rays, a receiver for the light secularly reflected from a plate, and an arithmetic unit to figure out the thickness of a water film formed on the plate based on the intensities of the received beams. Water lining which usually has patterns of narrow width can be detected, and the measurement of a water film thickness can be done with high speed.
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