Radiance temperature calibrations

Abstract

The calibration and related measurement services of the National Bureau of Standards are intended to assist the makers and users of precision measuring instruments in achieving the highest possible levels of accuracy, quality, and productivity. NBS offers over 300 different calibration, special test, and measurement assurance services. These services allow customers to directly link their measurement systems to measurement systems and standards maintained by NBS. These services are offered to the public and private organizations alike. They are described in NBS Special Publication (SP) 250, NBS Calibration Services Users Guide. The Users Guide is being supplemented by a number of special publications (designated as the "SP 250 Series") that provide a detailed description of the important features of specific NBS calibration services. These documents provide a description of the: (1) specifications for the service; (2) design philosophy and theory; (3) NBS measurement system; (4) NBS operational procedures; (5) assessment of measurement uncertainty including random and systematic errors and an error budget; and (6) internal quality control procedures used by NBS,

A national measurement system for radiometry, photometry, and pyrometry based upon absolute detectors

“…The NIST unit of radiation temperature is based upon the radiation output of blackbody sources and is described in detail in a NIST special publication [9]. In 1990 the Comite International des…”

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

“…See Waters et al [10] for a description of how uncertainties in this type of scale realization are determined. We have added a small contribution caused by the un- certainty in the effective wavelength.…”

The NBS scale of spectral irradiance

“…The NBS scale of spectral irradiance is derived from the NBS scale of spectral radiance [ 6 ] which is based on a realization of the International Practical Temperature Scale (IPTS-68) starting with a gold-point blackbody [ 7 ]. The average spectral radiance over the exit aperture of a special integrating sphere source is determined and then the flux from the sphere source which enters the receiving aperture of the spectroradiometer is calculated.…”