Patent ID: 8144328
Filing Date: 2012-03-27
Classification: G01J,G01N

Abstract:
1. An arrangement for in-situ optical interrogation of plasma emission to quantitatively measure normalized optical emission spectra in a plasma chamber, comprising: a flash lamp; a set of quartz windows; a plurality of collimated optical assemblies, said plurality of collimated optical assemblies are optically coupled to said set of quartz windows; a plurality of fiber optic bundles, said plurality of fiber optic bundles comprise at least an illumination fiber optic bundle, a collection fiber optic bundle, and a reference fiber optic bundle; and a multi-channel spectrometer, said multi-channel spectrometer is configured with at least a signal channel and a reference channel, said signal channel is optically coupled to receive light transmitted from at least said flash lamp, through at least said set of quartz windows, said set of collimated optical assemblies, said illuminated fiber optic bundle, and said collection fiber optic bundle to measure a first signal, wherein said reference channel is optically coupled to receive light from at least said flash lamp through said reference fiber optic bundle to measure a second signal simultaneously while said first signal is measured.