Journal
INTERNATIONAL JOURNAL OF THERMOPHYSICS
Volume 29, Issue 3, Pages 1014-1025Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10765-008-0403-3
Keywords
infrared radiation thermometer; InSb detector; middle temperature; multiple fixed points; temperature scale
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The NMIJ has established a temperature scale for infrared radiation thermometry from 100 to 420 degrees C consisting of three fixed-point blackbodies at the In, Sn, and Zn points and an InSb detector thermometer at a wavelength of 4.7 mu m. The blackbody cavities have large openings of 15 mm diameter. The expanded uncertainties (k = 2) of the In, Sn, and Zn fixed-point radiance temperatures are estimated to be 0.03, 0.03, and 0.05 K, respectively. The expanded uncertainties (k = 2) for the calibration of the infrared radiation thermometer are estimated to be 0.04 K at 157 degrees C (In point), 0.04 K at 232 degrees C (Sn point), and 0.07 K at 420 degrees C (Zn point).
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