Intercomparison of the ITS-90 radiance temperature scales of the National Physical Laboratory (U.K.) and the National Institute of Standards and Technology

Abstract

An intercomparison of radiance temperature scales lias been performed by the National Physical Laboratory (NPL) and the National Institute of Standards and Technology (NIST) using a standard transfer pyrometer operating at a wavelength of approximately 1000 nm. It was found that the radiance temperature scales established by the two laboratories were in agreement to 0.1% or better of the temperature over the range 1000 °C to 2500 °C.

A transportable gallium melting point blackbody for radiation thermometry calibration

“…In the sphere of radiation thermometry this, until recently, has almost exclusively been by the exchange of calibrated highstability lamps (Lee et al 1972, McEvoy et al 1996 and these are still used in top level intercomparison exercises (Bloembergen 1997). However, with the advent of stable photo-detectors it has become possible to perform such intercomparisons using calibrated radiation thermometers (Machin et al 1994, Sakuma et al 1996. The biggest concern with these devices is their potential drift in output during the intercomparison.…”

International comparison of radiation temperature scales among five national metrological laboratories using a transfer radiation thermometer

“…International comparisons of radiation scales were carried out in the 1970s and 1980s [2,3] using tungsten strip lamps as transfer standards. Recent comparisons have taken place between the NPL and the NIST [4] and among seven European laboratories using, in both cases, a silicon-detector infrared thermometer as transfer standard [5]. The NRLM began a three-year joint project in 1993 with the NIST, the IMGC and the PTB concerning radiation thermometry in the ultrahigh temperature range (above 2000 C).…”

Comparison of the ITS-90 using a transfer standard infrared radiation thermometer between seven EU national metrological institutes

“…However, using such a versatile instrument can have limitations which may prevent the lowest level of uncertainty from being attained. The latter approach was recently followed by Machin et al [7] in a comparison of the ITS-90 radiance temperature scales at the NPL and the NIST, and in a five-nation comparison performed by Sakuma et al [8].…”