Estimation des erreurs d’étalonnage de thermomètres infrarouges industriels liés à la méconnaissance de l’émissivité de sources et des bandes spectrales de thermomètres infrarouges
Laboratoire Commun de Métrologie LNE-CNAM, 61 rue du Landy, 93210 La Plaine Saint Denis, France
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Usually, NMIs propose calibration services of blackbody sources or infrared thermometer in aspecific spectral band. Due to the use of the specific transfer infrared thermometer such a calibration is valid only for this specific spectral band and for specific infrared thermometer spectral sensitivity. In this paper wewill focus on the errors introduced by the calibration process in the transfer laboratory due to the differentspectral response of the industrial infrared thermometer under calibration and the specific transfer infraredthermometer used for the blackbody calibration. The magnitude of this error depends both on the difference inspectral responsivities of the transfer and industrial infrared thermometers and on the spectral emissivity of thetransfer blackbody used. Most frequently, information about the spectral response of the infrared thermometerand the spectral emissivity of the blackbody are not available. Moreover the measurement of the spectralresponsivity of the infrared thermometer and the spectral emissivity of the blackbody source is way toocomplicated and time consuming to be performed. In this paper, we present the results of the estimation of thiserror for different typical cases, which could be of interest for the transfer laboratories to establish theiruncertainty budget as well as the possible effects on the uncertainties of calibration of industrial infrared thermometer for end-users.
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