1 September 1990 Cryogenic cavity radiometers as detectors and calibration standards for remote sensing
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Abstract
The large decrease in specific heat of pure metals achieved at liquid helium temperatures can be used to greatly reduce the time constant and increase the sensitivity of spectrally nonselective electrical substitution radiometers used for satellite remote sensing o fhte earth''s radiations. Single-element and array receivers with a natural time constant below 25 msec and a sensitivity below 10 nW have been constructed and servocontrolled to measure radiations from below 300 nm to beyond 40 microns, to better than 1 percent absolute accuracy. Flight of such an experiment on the Atlas pallet would provide an important proof of concept for future cryogenic radiometry at high accuracy, sensitivity and spatial resolution from the Space Station, from polar platforms and possibly from geosynchronous platforms, as flight qualified 2 K cryocoolers are developed in the next decade. The use of cryogenic radiometers in radiometric calibrations at NIST and elsewhere, and their possible applications for ground-based calibrations of the Eos remote sensing instrument are described.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter V. Foukal, Clifford C. Hoyt, Heinrich J. Kochling, Peter J. Miller, "Cryogenic cavity radiometers as detectors and calibration standards for remote sensing", Proc. SPIE 1299, Long-Term Monitoring of the Earth's Radiation Budget, (1 September 1990); doi: 10.1117/12.21368; https://doi.org/10.1117/12.21368
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