Patent ID: 6134005
Filing Date: 2000-10-17
Classification: G01J

Abstract:
A plasma processing system, comprising:a processing chamber comprising a window, wherein said window comprises an inner surface which is exposed to a plasma process conducted within said chamber and an outer surface which is isolated from said plasma process;a plasma generator in said processing chamber, wherein said plasma process may be run in said processing chamber when said plasma generator is activated;a first spectrometer assembly disposed outside of said processing chamber;a first fiber optic cable assembly operatively interconnecting said first spectrometer assembly and said window;a calibration light source disposed outside of said processing chamber and comprising a calibration light;a second fiber optic cable assembly operatively interconnecting said calibration light source and said window; anda comparator operatively interconnected with said first spectrometer assembly, wherein a first input to said comparator is data relating said calibration light sent to said window by said calibration light source through said second fiber optic cable assembly and wherein a second input to said comparator is data relating to a first portion of said calibration light reflected by said inner surface of said window and provided to said first spectrometer assembly through said first fiber optic cable assembly.