NDLI: Infrared Filter Radiometers for Thermodynamic Temperature Determination below 660 °C

Content Provider	Springer Nature Link
Author	ulkow, N. Taubert, R. D. Meindl, P. Hollandt, J.
Copyright Year	2008
Abstract	At the Physikalisch-Technische Bundesanstalt (PTB), absolutely-calibrated filter radiometers based on silicon photodiodes are routinely used for thermodynamic temperature determinations of blackbodies in the range from the zinc fixed point (FP) (419 °C) up to 3,000 °C. To extend the temperature range down to the tin FP (232 °C), we have designed two new filter radiometers based on indium gallium arsenide (InGaAs) photodiodes with center wavelengths at 1,300 nm and 1,550 nm. For the absolute calibration of the spectral irradiance responsivity of the new InGaAs filter radiometers, the spectral responsivity measurement in the near-infrared (NIR) spectral range has been significantly improved. With a newly developed tuneable laser and monochromator-based cryogenic radiometer facility, the relative standard uncertainty of the NIR spectral responsivity has been reduced from 0.17 % to about 0.03 %. By using the calibrated InGaAs filter radiometer in conjunction with the large-area double sodium heat pipe of the PTB, the first results for the difference between the thermodynamic temperature T and the ITS-90 temperature T $_{90}$ in the temperature range from the zinc FP up to the aluminum FP (660 °C) are presented. The values for T – T $_{90}$ determined with the new InGaAs filter radiometers are consistent within their relative standard uncertainty of about 30 mK at 419 °C to about 60 mK at 660 °C.
Starting Page	131
Ending Page	143
Page Count	13
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	30
Issue Number	1
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2008-08-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Filter radiometer Infrared Radiometry Thermodynamic temperature Spectral responsivity Physical Chemistry Mechanics Condensed Matter Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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