RADIATION THERMOMETER

Japanese Patent JPH03287028

A

PURPOSE:To accurately measure temperature and emissivity at the same time with two spectral radiation brightness signals including information on real temperature and real emissivity by performing arithmetic processing based upon an emissivity characteristic function inherent to a body to be measured which is found previously by experimentation. CONSTITUTION:A photodetector 2 diffracts radiation brightness from the body 1 to be measured into N with >=2 different wavelength ranges and a polarizer 3 detects respective polarized components to obtain N polarized spectral radiation brightness signal sequences 4. A selecting circuit 5 selects the best combination of wavelength and polarization for the body 1 to be measured among 2N sequences, and a parameter showing the relation between two known spectral emissivity values corresponding to the two selected spectral radiation conditions and the parameter of a black body furnace calibration function showing the relation between the spectral radiation brightness signal and real temperature are inputted from an input part 6 to an arithmetic part 7. The arithmetic part 7 finds the real emissivity on the emissivity characteristic function from the relational equation inherent to the body 1 to be measured between the two corresponding spectral emissivity values according to the two selected spectral radiation brightness signals, thereby finding the real temperature at the same time.

YOSHINAGA RYOICHI
TANAKA TOMIO
OHIRA TAKASHI

JP8750590A

December 17, 1991

April 03, 1990

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NIPPON STEEL CORP

G01J5/00; (IPC1-7): G01J5/00

Aoki Akira (4 outside)

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