Abstract
CONTINUOUS-WAVE electronic measurements of the speed of sound in liquids commonly depend on the presence of appreciable standing-waves in paths of low absorption, the half-wave-length being determined by detection of successive resonances as the path-length1 or frequency2 is changed. Alternatively, for liquids of high absorption in which the energy content of the standing-wave is necessarily small, the wavelength may be found by direct comparison of the phases of the transmitted and received signals. In conditions of very high absorption it has been necessary to use pulse techniques to obtain adequate acoustic intensity at the receiving transducer consistent with tolerable energy dissipation in the medium.
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KITE, L. Phase-Velocity of Ultra-sound in the Primary Aliphatic Amines. Nature 190, 1183 (1961). https://doi.org/10.1038/1901183a0
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DOI: https://doi.org/10.1038/1901183a0
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