Patent ID: 6369363
Filing Date: 2002-04-09
Classification: G01J

Abstract:
A method of measuring electromagnetic radiation that is radiated from a surface of an object disposed in a reaction chamber in order to determine properties of said object, wherein said object, for a thermal treatment thereof, is irradiated by electromagnetic radiation given off by at least one radiation source, said method including the steps of:determining the radiation given off by the irradiated object by means of at least one radiation detector; to effect characterization of the radiation given off by said at least one radiation source with at least one characteristic parameter, actively modulating the radiation of said at least one radiation source by modulating a control signal thereof; and correcting the radiation determined by said at least one radiation detector by taking into account the active modulation of the radiation of said at least one radiation source, the method being used to determine the properties of temperature, emissivity, transmissivity, reflectivity, layer thickness or layer characteristics of a material that is disposed on said object and differs from the material of said object itself, wherein said object is a semiconductor wafer, and wherein the transmissivity of said semiconductor wafer is determined by means of an evaluation unit, and conclusions regarding at least one of the temperature, emissivity, and reflectivity of said wafer are effected.