Uncertainty Budgets for Calibration of Radiation Thermometers below the Silver Point |
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Authors: | P Saunders J Fischer M Sadli M Battuello C W Park Z Yuan H Yoon W Li E van der Ham F Sakuma J Ishii M Ballico G Machin N Fox J Hollandt M Matveyev P Bloembergen S Ugur |
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Affiliation: | 1. Measurement Standards Laboratory of New Zealand (MSL), Industrial Research Ltd, P.O. Box 31-310, Lower Hutt, New Zealand 2. Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany 3. Conservatoire national des arts et métiers/Institut National de Métrologie (LNE-INM/CNAM), La Plaine-Saint-Denis, France 4. Istituto Nazionale di Ricerca Metrologica (INRiM), Turin, Italy 5. Korea Research Institute of Standards and Science (KRISS), Daejeon, South Korea 6. National Institute of Metrology (NIM), Beijing, China 7. National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA 8. Standards, Productivity and Innovation Board (NMC/SPRING), Singapore, Singapore 9. Nederlands Meetinstituut/Van Swinden Laboratorium B.V. (NMi/VSL), Delft, The Netherlands 10. National Metrology Institute of Japan, AIST (NMIJ/AIST), Tsukuba, Japan 11. National Measurement Institute of Australia (NMIA), Lindfield, Australia 12. National Physical Laboratory (NPL), Teddington, UK 13. D.I. Mendeleyev Institute for Metrology, Rostekhregulirovaniye of Russia (VNIIM), St Petersburg, Russia 14. TEKNOYAD, Kemal Nehrozoglu Cad. GOSB Technopark, Gebze, Kocaeli, Turkey
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Abstract: | Below the freezing point of silver, radiation thermometers are generally calibrated by implementing the multi-point interpolation
method using blackbody measurements at three or more calibration points, rather than the ITS-90 extrapolation technique. The
interpolation method eliminates the need to measure the spectral responsivity and provides greater accuracy at the longer
wavelengths required below the silver point. This article identifies all the sources of uncertainty associated with the interpolation
method, in particular, those related to the reference blackbody temperatures (either variable-temperature or fixed-point blackbodies)
and to the measured thermometer signals at these points. Estimates are given of the ‘normal’ and ‘best’ uncertainties currently
achievable. A model of the thermometer response is used to propagate all the uncertainties at the reference points and provide
a total uncertainty at any temperature within the calibration range. The multi-point method has the effect of constraining
the total uncertainty over this range, unlike the ITS-90 technique for which the uncertainties propagate as T
2. This article is a joint effort of the working group on radiation thermometry of the Consultative Committee for Thermometry
(CCT), summarizing the knowledge and experience of all experts in this field. |
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Keywords: | Calibration Radiation thermometry Uncertainty |
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