Application of laser polarimetry to the measurement of the specific heat capacity of molybdenum in the range 2000 to 2800 K by a pulse-heating technique
- National Inst. of Standards and Technology, Gaithersburg, MD (United States). Metallurgy Div.
- Containerless Research Incorporated, Evanston, IL (United States)
Measurement of the specific heat capacity of molybdenum (standard reference material) in the temperature range 2000 to 2800 K is described. The method is based on rapid resistive self-heating of a solid cylindrical specimen from room temperature to the maximum temperature of interest by the passage of a sub-second-duration electrical current pulse through the specimen with simultaneous measurement of the pertinent experimental quantities. The experimental quantities yield: the current through the specimen, voltage drop across the specimen, and specimen temperature. The objective of this study is to demonstrate the feasibility of performing accurate thermophysical measurements where the specimen`s true temperature is determined from measurements of surface radiance temperature with a pyrometer and normal spectral emissivity with a laser polarimeter. This approach of measuring true temperature eliminates the need of having a blackbody configuration for the specimen. In addition to the specific heat capacity, the normal spectral emissivity (at 633 nm) and electrical resistivity of molybdenum in the temperature range from 2000 to 2800 K are presented.
- OSTI ID:
- 308084
- Report Number(s):
- CONF-970629-; ISSN 0195-928X; TRN: IM9907%%10
- Journal Information:
- International Journal of Thermophysics, Vol. 19, Issue 4; Conference: 13. symposium on thermophysical properties, Boulder, CO (United States), 22-27 Jun 1997; Other Information: PBD: Jul 1998
- Country of Publication:
- United States
- Language:
- English
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