Patent ID: 6479801
Filing Date: 2002-11-12
Classification: G01J,H01L

Abstract:
A method of measuring temperature of an object of measurement placed in a multiple reflection environment by using a radiation thermometer, said method comprising the steps of:measuring a numerical value of a parameter that changes corresponding to a change in a radiance E of the object; and calculating a temperature of the object based on the numerical value of the parameter by using a formula indicating a relationship between the parameter, and effective emissivity &egr;eff of the object and a radiance of a blackbody f(T) that is expressed in a function of temperature T of the object, wherein the effective emissivity &egr;eff is defined by the following expression: &egr;eff=(1âˆ’&agr;)Â·&egr;+&agr;Â·&egr;/{1âˆ’FÂ·rÂ·(1âˆ’&egr;)}where F is a view factor, &egr; is an emissivity of the object, r is a reflectivity of a reflecting plate opposing to the object and &agr; is a weighting factor indicating effects of multiple reflection.