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contributor authorDonlon, C. J.
contributor authorNightingale, T.
contributor authorFiedler, L.
contributor authorFisher, G.
contributor authorBaldwin, D.
contributor authorRobinson, I. S.
date accessioned2017-06-09T14:15:25Z
date available2017-06-09T14:15:25Z
date copyright1999/09/01
date issued1999
identifier issn0739-0572
identifier otherams-1581.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4151523
description abstractThere are many infrared radiometer systems available for the measurement of in situ sea surface skin temperature (SSST). Unfortunately, the marine environment is extremely hostile to optical components, and to ensure the accuracy of SSST measurements, an absolute calibration of instrumentation using an independent calibration reference is required both before and after any sea deployment. During extended deployments it is prudent to have additional regular calibration data to monitor instrument performance characteristics. This paper presents a design for an ambient temperature (278?325 K), wide aperture (100 mm), reference blackbody unit that may be used to calibrate a variety of sea-going infrared radiometer systems both in the laboratory and in the field. The blackbody consists of a spun copper cavity coated with well-characterized high emissivity paint (Mankiewicz Nextel Velvet Coating 811-21) immersed in a water bath that is continuously mixed using a strong water pump. The radiant temperature of the blackbody cavity is determined from the measured water bath temperature. Results derived from validation and intercomparison experiments show this blackbody design to be an accurate and reliable reference blackbody source. However, in order to ensure that the best possible calibration data are obtained, extreme care must be taken to ensure the accurate measurement of the water bath temperature, proper positioning of a radiometer in front of the cavity itself, and prevention of condensation on the cavity surface. Four blackbody units have been specifically built for the European Union combined action for the study of the ocean thermal skin (CASOTS) program. Using these units as reference radiance sources, the authors describe the strategy adopted and present results obtained from the CASOTS radiometer intercalibration experiment. These results highlight the need to obtain independent calibration data both before and after sea-going radiometer deployments and the need to standardize field radiometer calibration protocols.
publisherAmerican Meteorological Society
titleThe Calibration and Intercalibration of Sea-Going Infrared Radiometer Systems Using a Low Cost Blackbody Cavity
typeJournal Paper
journal volume16
journal issue9
journal titleJournal of Atmospheric and Oceanic Technology
identifier doi10.1175/1520-0426(1999)016<1183:TCAIOS>2.0.CO;2
journal fristpage1183
journal lastpage1197
treeJournal of Atmospheric and Oceanic Technology:;1999:;volume( 016 ):;issue: 009
contenttypeFulltext


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