New Methods for Direct Visualisation of Ultra-sonic Waves and for the Measurement of Ultra-sonic Velocity


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… (More)
DOI: 10.1038/133176b0


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