Long-Term Temporal Stability of the National Institute of Standards and Technology Spectral Irradiance Scale Determined Using Absolute Filter Radiometers

Published

October 1, 2002

Author(s)

Howard W. Yoon, Charles E. Gibson

Abstract

The temporal stability of the NIST spectral irradiance scale as measured using broad-band filter radiometers calibrated for absolutespectral irradiance responsivity is described. The working standard FEL lamps and the check standard FEL lamps have been monitoredusing radiometers in the ultraviolet and the visible wavelength regions. The measurements using these two radiometers reveal that theNIST spectral irradiance scale as compared to an absolute thermodynamic scale has not changed by more than 1.5% in the visible from1993 to 1999. Similar measurements in the ultraviolet reveal that the corresponding change is less than 1.5 % from 1995 to 1999.Furthermore, a check of the spectral irradiance scale using six different filter radiometers calibrated for absolute spectral irradianceresponsivity based on the High-Accuracy Cryogenic Radiometer (HACR) shows that the agreement between the present scale and thedetector-based scale is better than 1.3 % throughout the visible to the near-infrared wavelength region. These results validate the assignedspectral irradiance of NIST or NIST-traceable standard sources which are widely disseminated.

Citation

Applied Optics

Volume

41

Issue

No. 28

Pub Type

Journals

Keywords

absolute radiometry, detector-based spectral irradiance, spectral irradiance scale

Citation

Yoon, H. and Gibson, C. (2002), Long-Term Temporal Stability of the National Institute of Standards and Technology Spectral Irradiance Scale Determined Using Absolute Filter Radiometers, Applied Optics (Accessed October 25, 2025)