Comparison of Measurement Techniques for Determining the Thermal Emittance of Coupons at Elevated Temperatures

Details Comparison of Measurement Techniques for Determining the Thermal Emittance of Coupons at Elevated Temperatures Comparison of Measurement Techniques for Determining the Thermal Emittance of Coupons at Elevated Temperatures

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..654..715k&link_type=abstract

SPACE TECHNOLOGY AND APPLICATIONS INT.FORUM-STAIF 2003: Conf.on Thermophysics in Microgravity; Commercial/Civil Next Generation

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Thermal Radiation

Scientific paper

The development of a highly efficient nuclear space power system requires that all of the available thermal energy emitted from the General Purpose Heat Source (GPHS) modules (~250 thermal watts per module) be utilized in the most efficient manner. This includes defining the heat transfer/thermal gradient profile between the surface of a GPHS module and the surface of the selected converter's hot end. Control of the radiant heat transfer between the two surfaces can be achieved by regulating how efficiently the converter's hot end surface transfers heat compared to a perfect blackbody (i.e. its infrared emittance). By oxidizing and/or grit blasting the surface of candidate converter materials it is possible to increase their emittance. L-605 test specimens were WC grit blasted and heat treated at 1023K for 72hours in air and their emittance values at elevated temperatures up to ~1000K were determined using three different measurement techniques (Infrared Camera, Infrared Reflectometer, and a Calorimetric Test Method).

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