Abstract
ULTRA-SONIC waves in liquids or transparent solids may be demonstrated visually by a method developed by the author and his co-workers1. Ultra-sonic waves produce a regular (sinuous) distribution of density, which gives optically an effect similar to a large number of cylindrical lenses. A parallel beam of light passing normal to the direction of the ultra-sound converges therefore to a system of focal lines. The distance of two succeeding lines produced by stationary waves is equal to half an ultra-sonic wave-length; in the case of progressive waves, which must be observed by means of a high-frequency stroboscope, the distance equals one wave-length.
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Ch. Bachem, E. Hiedemann and H. R. Asbach, NATURE, 133, 176; 1934. Ch. Bachem und E. Hiedemann, Z. Phys., 94, 68; 1935. E. Hiedemann und K. H. Hoesch, Naturwiss., 23, 511; 1935. Also other papers in Z. Phys.
E. Hiedemann, H. R. Asbach und K. H. Hoesch, Z. Phys., 90, 322; 1934. L. Bergmann, Ann. Physik., 21, 553; 1935.
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HIEDEMANN, E. Measurement of the Elastic Constant of Isotropic Transparent Solids. Nature 136, 337 (1935). https://doi.org/10.1038/136337a0
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DOI: https://doi.org/10.1038/136337a0
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