Characterization of an Ellipsoidal Radiometer

An ellipsoidal radiometer has been characterized using a 25 mm variable-temperature blackbody as a radiant source. This radiometer is intended for separating radiation from convection effects in fire test methods. The characterization included angular response, responsivity, and purge-gas flow effec...

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Bibliographic Details
Published in:Journal of research of the National Institute of Standards and Technology 2003-03, Vol.108 (2), p.115-124
Main Authors: Murthy, Annageri V, Wetterlund, Ingrid, DeWitt, David P
Format: Article
Language:English
Subjects:
Measurement
Radiation
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Summary:An ellipsoidal radiometer has been characterized using a 25 mm variable-temperature blackbody as a radiant source. This radiometer is intended for separating radiation from convection effects in fire test methods. The characterization included angular response, responsivity, and purge-gas flow effect studies. The angular response measurements showed that the reflection from the radiometer cavity was higher on one of the cavity halves relative to the other half. Further development work may be necessary to improve the angular response. The responsivity measured with reference to a transfer-standard electrical-substitution radiometer showed dependence on the distance of the radiometer from the blackbody cavity. The purge-gas had the effect of reducing the signal output nearly linearly with flow rate.
ISSN:1044-677X
2165-7254
DOI:10.6028/jres.108.011