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.
Proceedings Title: Proceedings TEMPMEKO '99 The 7th International Symposium on Temperature and Thermal Measurements in Industry and Science
Conference Dates: June 1-3, 1999
Conference Location: Delft, NL
Conference Title: International Symposium on Temperature and Thermal Measurements
Pub Type: Conferences
intercomparisions, ITS-90, radiation thermometry, temperature