High-speed temperature and emissivity measurements for thermophysical property determination of conducting materials

Details High-speed temperature and emissivity measurements for thermophysical property determination of conducting materials High-speed temperature and emissivity measurements for thermophysical property determination of conducting materials

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..375s&link_type=abstract

In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla

Statistics

Applications

Space Environment, Materials, Ground Testing

Scientific paper

Materials in aerospace and other applications are often used near their mechanical limits at high temperatures. Predicting material behavior under such conditions requires that their properties be measured accurately. For a number of reasons (vaporization, reaction with containers, etc.) in many experimental techniques the sample is heated very rapidly (a few μs to ms time regime) by passing an electric current through it or by laser heating. This fast heating is why pyrometry is often the only way to get reliable temperature data from these experiments. The radiance temperature can be determined within a fraction of a Kelvin to a few Kelvin, depending on the speed of the experiment and the temperature to be measured. In order to extract thermodynamic temperatures from the radiance temperature another quantity - the normal spectral emissivity at the wavelength of the pyrometer used - must be known. Unfortunately emissivity depends not only on the material and temperature of the sample but also on surface conditions such as roughness and contamination, making this a difficult measurement to make accurately. This paper deals with the basics of pyrometry applied to high-speed measurements and also with ways to determine emissivity with reasonable accuracy.

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