Abstract
A Fourier-transform radiometer is used to measure blackbody
temperatures in the 500–1000-K range. The measurements involve
collecting mid-infrared spectra at two known reference temperatures and
one unknown temperature. The accuracy of the interpolation
measurement technique is discussed, and the effects of the uncertainty
in the temperature reference points, the voltage ratio measurement, and
the wavelength accuracy are described. Temperature accuracy at the
0.5% level has been achieved; the main uncertainty component is caused
by the interferometer drift. Directions to reach 100-mk accuracy
levels have been identified.
© 1998 Optical Society of America
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