Patent ID: 6561694
Filing Date: 2003-05-13
Classification: G01J

Abstract:
A method for calibrating temperature measurements that are taken with a first radiation detector for measuring thermal radiation given off by a reference substrate, said method including the steps of:heating said reference substrate, which carries at least one reference material having a known melting point temperature, to or over said melting point temperature; measuring the thermal radiation of said reference substrate during said heating step, or during a cooling period that follows said heating, or during both said heating and said cooling period; and correlating a measurement plateau of the thermal radiation which occurs during said measuring step with said known melting point temperature, said measurement plateau being characterized by a period during which the thermal radiation of said reference substrate has substantially no abrupt changes wherein at least one radiation source is used for heating said reference substrate and wherein, to achieve an emissivity independent measurement, at least one of the method of detecting radiation emitted from said at one least radiation source with at least one second radiation detector, modulating the radiation emitted by said at least one radiation source with at least one characteristic parameter, and correcting the radiation detected by said at least one first radiation detector by the radiation detected by said at least one second radiation detector to compensate for radiation of said at least one radiation source reflected from said reference substrate and the method of measuring the thermal radiation emitted by said reference substrate on a side of said reference substrate that faces a cavity radiator is used.