Development of A Changeable-aperture Blackbody for Low Temperature Standards
A cylindrical blackbody with a changeable aperture and horizontal cavity was designed and constructed for facilitating low-temperature infrared-radiation thermometers ranging from -10 ℃ to 10 ℃. The blackbody cavity is immersed horizontally in a stirring liquid bath. Dry gas is filled from the aperture opening located at the top into the blackbody cavity in order to reduce dew formed on the surface. The temperature of blackbody cavity is monitored using four Platinum Resistance Thermometers (PRTs) which were calibrated according to the International Temperature Scale of 1990 (ITS-90). The effective emissivity of the cavity is maintained over 0.99 units for the range between -10 ℃ and 10℃. For converging factor (k) equals to 2, the uncertainties of the whole standard blackbody system, without deviceunder-test (DUT), at -10 ℃ and 0 ℃ are 0.12 ℃ and 0.18 ℃, respectively, which were also traceable to ITS-90.
Metrology Infrared radiation thermometers Stirred liquid bath Low temperature Platinum resistance thermometers
Hsin-Yi Ko Bor-Jiunn Wen
Industrial technology Research Institute, Hsinchu, Taiwan, China
国际会议
2008年国际温度与热物性测量会议(TEMP BEIJING 2008)
北京
英文
199-202
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）