Patent ID: 7135869
Filing Date: 2006-11-14
Classification: G01B,G01N,G01R

Abstract:
1. A thickness measurement system for measuring a film thickness of a sample, comprising: an electromagnetic cavity resonator having an exposed side adapted to contact a portion of the surface of the sample; a suction assembly to apply a pressure to the cavity resonator to secure the cavity resonator to the measurement sample; a signal decoupler coupled to the cavity resonator; a signal amplitude detector coupled to the decoupler; a processing unit coupled to the amplitude detector that processes; a frequency signal generator coupled to the processing unit and to the decoupler; and a correlating algorithm correlating a resonant frequency shift detected by the amplitude detector to the film thickness of the portion of the surface of the sample being measured, wherein during the measurement the exposed side of the cavity resonator is pressed against the portion of the surface of the sample.