1 August 1991 Cryogenic radiometers and intensity-stabilized lasers for EOS radiometric calibrations
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Liquid helium-cooled electrical substitution radiometers (ESRs) provide irradiance standards with demonstrated absolute accuracy at the 0.01 percent level, spectrally flat response between the UV and IR, and sensitivity down to 0.1 nW/sq cm. We describe an automated system developed for NASA - Goddard Space Flight Center, consisting of a cryogenic ESR illuminated by servocontrolled laser beams. This system is designed to provide calibration of single-element and array detectors over the spectral range between 257nm in the UV to 10.6 microns in the IR. We also describe a cryogenic ESR optimized for black body calibrations that has been installed at NIST, and another that is under construction for calibrations of the CERES scanners planned for Eos.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter V. Foukal, Peter V. Foukal, Clifford C. Hoyt, Clifford C. Hoyt, Linas Jauniskis, Linas Jauniskis, } "Cryogenic radiometers and intensity-stabilized lasers for EOS radiometric calibrations", Proc. SPIE 1493, Calibration of Passive Remote Observing Optical and Microwave Instrumentation, (1 August 1991); doi: 10.1117/12.46685; https://doi.org/10.1117/12.46685

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