Patent ID: 6642723
Filing Date: 2003-11-04
Classification: B05C,G01B,G01N

Abstract:
An apparatus for monitoring deposition of a medium (14) on a substrate (13), said apparatus comprising:at least one sensor (10) comprising two electrodes (11, 12) which are placed at a given distance from the substrate and adapted to apply an AC voltage to the medium (14) and the substrate (13), said substrate moving relative to the sensor (10); and a test electronic circuit (15) connected to the sensor (10) and for emitting a signal characteristic of the substrate (13) together with the medium (14), wherein the apparatus is adapted to measure the imaginary component of the dielectric constant of the substrate (13) together with the medium (14) situated between the two electrodes (11, 12), and the test electronic circuit is adapted to determine the characteristic signal based on the measured value.