Directing the heat radiation light which is emitted from surface thermometry manner and the surface thermometry device

摘要

PROBLEM TO BE SOLVED: To suppress a temperature measurement error caused by scattering of thermal radiation light or the like generated by disturbance water existing between the surface of a steel product whose temperature is to be measured and a radiation thermometer.;SOLUTION: In this method, the surface temperature of the steel product M whose temperature is to be measured is measured by detecting the thermal radiation light radiated from the surface of the steel product M whose temperature is to be measured by the radiation thermometer arranged oppositely to the steel product M whose temperature is to be measured. The method is characterized by setting at 75° or more. the minimum expansion angle θ of the edge part E of the steel product M whose temperature is to be measured based on an intersection point between an interface between an optical path stable domain S1 in a domain where an optical path of the thermal radiation light detected by the radiation thermometer and an optical path unstable domain S2, and the optical axis of the radiation thermometer.;COPYRIGHT: (C)2006,JPO&NCIPI