INTERCOMPARISON OF THE ITS-90 RADIANCE TEMPERATURE SCALES OF THE NATIONAL-PHYSICAL-LABORATORY (UK) AND THE NATIONAL-INSTITUTE-OF-STANDARDS-AND-TECHNOLOGY

An intercomparison of radiance temperature scales has been performed b y the National Physical Laboratory (NPL) and the National Institute of Standards and Technology (NIST) using a standard transfer pyrometer o perating at a wavelength of approximately 1000 nm. It was found that t he radiance temperature scales established by the two laboratories wer e in agreement to 0.1% or better of the temperature over the range 100 0-degrees-C to 2500-degrees-C.