RESEARCH ON RADIATION THERMOMETRY OF NEAR ROOM TEMPERATURE

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The key problems in radiation thermometry are the unknown emissivity of objects and the background noise from surroundings.The author developed a new method of radiation thermometry for low emissivity metals having normal emissivity less than 0.1 such as aluminum, cold rolled steel and stainless steel at temperature ranging from 310K to 370K.The method makes use of directional emissivity of metals and also of the specularly reflecting property of the metal surface at long wavelength of 8-10mum range.The author also developed a new radiation thermometer for the measurment of near roomtemperature with high signal-to-noise ratio (S/N). The thermometer which uses an HgCdTe semiconductor sensor, is compact and insensitive to tempetrature changes of the surroundings. Its major breakthrough owes much to the fact that the sensor is cooled and controlled by Peltier thermoelectric devices and that the sensor serves as reference radiator. A well designed optical system with a chopper and a concave mirror shuts off stray radiation, thus improving the S/N.