Fluorescence dot area meter

Details Fluorescence dot area meter Fluorescence dot area meter

1996-08-21

1998-03-17

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

With color transmitting filter

3504581, 3504591, 356379, G01N 264

Patent

active

057293481

ABSTRACT:
A fluorescence dot area meter for accurately measuring halftone dot area on a printing plate having an emulsion containing one or more fluorescent compounds. The fluorescent dot area meter generally includes an illumination source for providing light having a first range of wavelengths, a system for exposing the printing plate to this light to cause the printing plate to emit light (fluoresce) within a second, higher range of wavelengths, and a system for determining halftone dot area based on a measurement of the light emitted by the printing plate.

REFERENCES:
patent: 4339525 (1982-07-01), Bratt et al.
patent: 4516856 (1985-05-01), Popelka
patent: 5099131 (1992-03-01), Brownrigg et al.
patent: 5578818 (1996-11-01), Kain et al.

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