Abstract
MEASUREMENTS of ultra-sonic velocities in liquids can be easily made by the method of Debye and Sears or Lucas and Biquard1, who used the periodically alternating densities produced in a liquid by ultra-sonic waves as an optical grating. Such measurements have been made in this department at the suggestion of Prof. H. Falkenhagen, who wanted more precise data on the compressibilities of electrolytic solutions. In the pursuit of these researches we have found it preferable to visualise this optical grating directly instead of using it for the diffraction of light. Details of the new method will be given in a forthcoming publication in the Zeitschrift für Physik. The picture reproduced as Fig. 1 is a photomicrogram of a stationary ultra-sonic wave formed at a convex mirror in xylol, frequency about 4500 kHz. It is possible to measure the distance of the nodal lines very precisely. By measuring a great number of nodal lines, we are able to make measurements of ultra-sonic velocities in liquids with the highest precision.
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References
P. Debye and F. W. Sears, Proc. Nat. Acad. Sci., 18, 410; 1932. R. Lucas and P. Biquard, J. Phys. et le Rad., 3, 464; 1932.
R. W. Boyle, J. F. Lehmann and C. D. Reid, Trans. Roy Soc. Canada, 19, 167; 1925; and many other papers by Boyle and co-workers.
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BACHEM, C., HIEDEMANN, E. & ASBACH, H. New Methods for Direct Visualisation of Ultra-sonic Waves and for the Measurement of Ultra-sonic Velocity. Nature 133, 176 (1934). https://doi.org/10.1038/133176b0
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DOI: https://doi.org/10.1038/133176b0
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