PURPOSE: To accurately calibrate a radiation thermometer by providing a radiation tube having a central bottom, and a carbon cylinder provided near the bottom, and measuring the temperature of the bottom via the carbon cylinder.
CONSTITUTION: The end of optical fiber 12 of an optical fiber radiation thermometer to be calibrated is disposed in a cavity formed out of a carbon cylinder 8 and a central bottom 4, and its temperature is measured. The temperature of the bottom 4 is measured with a standard radiation thermometer 14, and the both are compared to conduct the temperature calibration in the state equal to the actual state at a high temperature. Instead of a carbon unit 9 or in addition to it, inert gas such as Ar, etc., is fed into a radiation tube 2 to prepare the interior with non-oxidizing atmosphere, thereby preventing the deterioration of the end of the optical fiber 12. The cylinder 8 is provided to improve the effective emissivity of a black body furnace, thereby providing the furnace of further high performance. It can be also used for comparison calibrations of general radiation thermometer, a thermocouple, etc., except optical fiber.
KITAZAWA MOTOHIKO
IIIZUMI TADASHI
| JPH05142049A | 1993-06-08 | |||
| JPH02107049U | 1990-08-24 |