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Publication Citation: A Comparison of ITS-90, Above the Silver Point, as Realised by NIST and NPL

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Author(s): Graham Machin; Charles E. Gibson; Bettye C. Johnson; Howard W. Yoon;
Title: A Comparison of ITS-90, Above the Silver Point, as Realised by NIST and NPL
Published: January 01, 2000
Abstract: A comparison of the radiance temperature scales between 1000 C and 2700 C has been performed between the National Physical Laboratory (NPL) and the National Institute of Standards and Technology (NIST). Two transfer radiation thermometers, of identical design, were prepared by NPL for the comparison. These each had a silicon photodiode detector, a spot size of 2.8 mm at 620 mm and a nominal operating wavelength of about 1000 nm. The characterisation included determination of the instrumental size of source effect, system temperature coefficient and calibration. After characterization the devices were transported to NIST in October 1998, and calibrated using the NIST radiance temperature calibration facility. In addition, whilst at NIST, the spectral response for one of the instruments were measured.On return to NPL the devices were re-calibrated to determine the extent of any drifts that transportation might have caused.It was established that the ITS-90 radiance temperature scales as realised by each institute were in agreement to <0.05% of temperature.This paper describes the instruments used for the comparison, the r4ealisation of scales by the two laboratories and the comparison results.
Conference: International Symposium on Temperature and Thermal Measurements
Proceedings: Proceedings TEMPMEKO '99 The 7th International Symposium on Temperature and Thermal Measurements in Industry and Science
Location: Delft, NL
Dates: June 1-3, 1999
Keywords: intercomparisions;ITS-90;radiation thermometry;temperature
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