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Proceedings Paper

Spectral responsivity determination of a transfer-standard pyroelectric radiometer
Author(s): George P. Eppeldauer; Miklos Racz; Leonard M. Hanssen
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Paper Abstract

A NIST-developed pyroelectric radiometer was characterized and calibrated to extend the NIST high accuracy spectral responsivity scale from the visible range to the ultraviolet (UV) and infrared (IR). The transmission of the gold-black coated LiNbO3 pyroelectric material is negligibly small, therefore the absorptance, equal to 1-reflectance, is proportional to the responsivity of the detector. The spectral total reflectance of the coating was measured with integrating spheres and spectrophotometers to determine the relative spectral responsivity from the UV to the IR. The relative spectral responsivity was converted into absolute spectral power and irradiance responsivities by measuring the total power in a 442 nm stabilized laser beam. The reference device for absolute calibration was a Si trap-detector calibrated against the primary standard cryogenic radiometer. The calibrations were repeated with 31 months separation. A 0.3 % long-term shift in the reflectance was measured between 800 nm and 19 μm. The 28 % reflectance at 10.6 μm scaled up the 0.1 % spatial responsivity non-uniformity in the visible (where the reflectance was 0.4 %) to 8 %. The spectral power and irradiance responsivity scales of the pyroelectric radiometer have been realized between 250 nm and 2.5 μm with a relative standard uncertainty of less than 0.34 % (coverage factor k=1).

Paper Details

Date Published: 18 December 2002
PDF: 9 pages
Proc. SPIE 4818, Infrared Spaceborne Remote Sensing X, (18 December 2002); doi: 10.1117/12.450561
Show Author Affiliations
George P. Eppeldauer, National Institute of Standards and Technology (United States)
Miklos Racz, National Institute of Standards (United States)
Leonard M. Hanssen, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 4818:
Infrared Spaceborne Remote Sensing X
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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