Acoustic-velocity measurement across the diameter of a liquid-metal column
Tóm tắt
Present techniques for measuring sound velocity in liquid metals have been limited by the use of transducers which cannot survive in extreme-temperature conditions. These methods also require relatively long measurement times. An optical noncontacting method has been developed which may be used for extremely short experimental times and very high temperatures and pressures. This technique is being incorporated into an isobaric-expansion apparatus in which a 1-mm-diam wire sample in a high-pressure argon-gas environment is resistively heated to melt within a time period of only a few microseconds. Before instability of the liquid column occurs, thermal expansion, enthalpy and temperature are measured. The addition of the sound-velocity measurement permits a more complete determination of the thermophysical properties of the liquid metal.
Tài liệu tham khảo
Schreiber, E., Orson, L.A., andSoga, N., Elastic Constants and Their Measurement, McGraw-Hill, New York (1973).
Gathers, G.R., Shaner, J.W., Calder, C.A. and Wilcox, W.W., “Determination of Sound Velocity in Liquid Metals at Temperatures Greater than 4000K,” Proceedings of the Seventh Symposium on Thermophysical Properties (May 10–12, 1977).
Calder, C.A. andWilcox, W.W., “Technique for Measurement of Elastic Constants by Laser Energy Deposition,”Rev. Sci. Instr.,45 (12),1557–59 (Dec. 1974).
Calder, C.A. and Wilcox, W.W., “Acoustic Velocity Measurement Across the Diameter of a Small Rod,” UCRL-78751, Lawrence Livermore Laboratory Report (Sept. 1976).
Simmons, G. andWang, H., Single Crystal Elastic Constants and Calculated Aggregate Properties: A Handbook, 2nd Ed., MIT Press, Cambridge (1971).
Webber, G.M.B. andStephens, R.W.B., “Transmission of Sound in Metals,”Physical Acoustics, W.O. Mason, Ed., V. IV, Part B, 53–97, Academic Press, New York (1968).