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Title of Journal: Int J Thermophys

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Abbravation: International Journal of Thermophysics

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Springer US

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DOI

10.1016/j.bica.2015.06.002

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1572-9567

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Spectral Emissivity of Surface Blackbody Calibrato

Authors: Sønnik Clausen
Publish Date: 2007/10/10
Volume: 28, Issue: 6, Pages: 2145-2154
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Abstract

The normal spectral emissivity of commercial infrared calibrators is compared with measurements of anodized aluminum samples and grooved aluminum surfaces coated with Pyromark Measurements performed by FTIR spectroscopy in the wavelength interval from 2 to 20 μm and at temperatures between 5 and 550°C are presented with absolute uncertainties from 025 to 1 in spectral regions with sufficient signal and no significant atmospheric gas absorption A large variation in emissivity with wavelength is observed for some surfaces ie from 1 to 3 to more than 10 The variation in emissivity using similar materials can be reduced to 05–1 by optimizing the coating process and the surface geometry Results are discussed and an equation for calculation of the equivalent blackbody surface temperature from FTIR spectra is presented including reflected ambient radiation It is in most cases necessary to correct temperature calibration results for calibrators calibrated at 8–14 μm to obtain absolute accuracies of 01–1°C in other spectral regions depending on the temperature Uncertainties are discussed and equations are given for the correction of measured radiation temperatures

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