Evaluation of a Pulse-Heating Reflectometric Technique

Abstract

The classical millisecond-resolution pulse-heating method makes use of tubular specimens with a rectangular blackbody hole for accurate measurements of several thermophysical properties at high temperatures. An alternative measurement technique that uses simple strip specimens has been developed at the IMGC (Italy). The normal spectral emissivity of the pulse-heated strip is measured by integrating sphere reflectometry, using a modulated laser beam to discriminate between the reflected radiation and that self-emitted by the specimen. After a brief description of the measurement system and a review of the main experimental results, attention is devoted to current developments and possible improvements of the method, with particular attention to experiments performed at the melting point. The measurement technique is analyzed and evaluated, with a brief description of potential future measurement possibilities.