Fluorescence dot area meter.

摘要

A fluorescence dot area meter (10) for accurately measuring halftone dot area on a printing plate (12) having an emulsion (14) containing one or more fluorescent compounds. The fluorescent dot area meter generally includes an illumination source (16) for providing light having a first range of wavelengths ( lambda ), a system (32) for exposing the printing plate to this light to cause the printing plate to emit light (fluoresce) within a second, higher range of wavelengths ( lambda '), and a system (18,20) for determining halftone dot area based on a measurement of the light emitted by the printing plate. <IMAGE>