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Optical Engineering

Improved calibration of infrared radiometers for cloud temperature remote sensing
Author(s): Joseph A. Shaw; Leonard S. Fedor
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Paper Abstract

We discuss errors and uncertainties in calibrating infrared radiometers to measure the temperature of clouds in the earth's atmosphere. Many of the points we make apply to any radiometric temperature-sensing application where the target temperature is less than the ambient temperature. Dominant uncertainties and errors are due to ambient radiance reflected from the blackbody-simulator source, thermal fluctuations in the radiometer, and imprecise voltage measurements. Our improved technique removes, reduces, or accounts for these errors and uncertainties. The resulting calibration uncertainty is ± 0.8°C for a radiometer with a 10-v output range. We verified this accuracy by comparing cloud-base temperatures measured by ground-based IR radiometers, in situ (radiosonde) sensors, and other remote sensors on the ground and on satellites. We made these comparisons for spatially uniform blackbody clouds that filled the field of view of our ground-based radiometers.

Paper Details

Date Published: 1 May 1993
PDF: 9 pages
Opt. Eng. 32(5) doi: 10.1117/12.133232
Published in: Optical Engineering Volume 32, Issue 5
Show Author Affiliations
Joseph A. Shaw, Univ. of Arizona (United States)
Leonard S. Fedor, NOAA (United States)

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