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Proceedings Paper

Cryogenic cavity radiometers as detectors and calibration standards for remote sensing
Author(s): Peter V. Foukal; Clifford C. Hoyt; Heinrich J. Kochling; Peter J. Miller
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Paper 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.

Paper Details

Date Published: 1 September 1990
PDF: 9 pages
Proc. SPIE 1299, Long-Term Monitoring of the Earth's Radiation Budget, (1 September 1990); doi: 10.1117/12.21368
Show Author Affiliations
Peter V. Foukal, Cambridge Research and Instrumentation, Inc. (United States)
Clifford C. Hoyt, Cambridge Research and Instrumentation, Inc. (United States)
Heinrich J. Kochling, Cambridge Research and Instrumentation, Inc. (United States)
Peter J. Miller, Cambridge Research and Instrumentation, Inc. (United States)


Published in SPIE Proceedings Vol. 1299:
Long-Term Monitoring of the Earth's Radiation Budget
Bruce R. Barkstrom, Editor(s)

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