An ellipsoidal radiometer, under development by Nils-Erik Gunners in close cooperation with the SPSwedish National Testing and Research Institute, has been characterized using a 25 mm variabletemperatureblackbody as a radiant source. This radiometer is intended for separating radiation fromconvection 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 fromthe radiometer cavity was higher on one of the cavity halves relative to the other half. Furtherdevelopment work may be necessary to improve the angular response. The responsivity measured withreference to a transfer-standard electrical-substitution radiometer showed dependence on the distance ofthe radiometer from the blackbody cavity. The purge-gas had the effect of reducing the signal outputnearly linearly with flow rate.
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