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A One-Solar-Constant Irradiance Standard

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Abstract

A new high-intensity standard of total and spectral irradiance has been developed recently at the National Bureau of Standards. The standard consists of a 1000-W tungsten–halogen lamp mounted in a ceramic reflector, the reflecting surface of which is coated with flame-sprayed Al2O3. The lamp–reflector combination results in a source having a relatively small (3 cm × 5 cm) radiating area yielding a total irradiance, at a distance of 40 cm, of about 136 mW cm−2. The total irradiance calibrations are based on the radiance of a 1400-K blackbody and have an estimated maximum systematic error of 0.9% and a maximum estimated standard error of 0.19%. The spectral measurements were made over the wavelength range of 0.3 μm to 2.5 μm relative to the NBS 1000-W tungsten–halogen irradiance standards. The estimated uncertainty in these measurements ranges from 4% in the visible and near ir to 8% in the uv.

© 1970 Optical Society of America

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