VORRICHTUNG ZUR ERMITTLUNG DER SCHICHTDICKE EINES FLUIDS

摘要

The device comprises an emitter 8 operating in the microwave range at a frequency which is absorbed by the fluid. The emitter is operated so that the power input to the emitter is a measure of the film thickness. The device may be used to measure the thickness of the dampening-medium film 3 provided on the surface of a printing forme 4 of an offset printing machine. The emitter has such a low power that the power input varies according to the respective fluid amount or the thickness of the fluid film being used. The emitting antenna is preferably placed a slight distance from the printing plate. The antenna may be striplike extending over the width of the plate or a plurality of antennae, each irradiating a separate area and comprising separate emitters may be provided. <IMAGE>