Abstract
It is shown that it is possible to use a continuous sinusoidal signal to make relative measurements of the velocity and absorption coefficient of ultrasound in highly absorbing liquids such as liquid crystals. Compared with the traditional variable-frequency pulse-phase method, the technique described has the advantage of giving a direct reading of the results under dynamic measurement conditions. A block diagram and the characteristics of the equipment for measuring the anisotropy of acoustic parameters by both pulse and continuous methods are presented.
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References
O. Ya. Shmelev, “Anisotropic propagation of ultrasound in liquid crystals having a nematic — smectic A phase transition,” Candidate Dissertation, Moscow (1983).
O. Ya. Shmelev, Izmer. Tekh., No. 11, 57 (1988).
O. Ya. Shmelev, Prib. Tekh. Eskp., No. 2, 124 (1986).
O. Ya. Shmelev, The Use of Ultrasound in Materials Research [in Russian], No. 38, VZMI, Moscow (1987), p. 36.
O. Ya. Shmelev, Izmer. Tekh., No. 2, 51 (1994).
Additional information
Translated from Izmeritel'naya Tekhnika, No. 1, pp. 66–67, January, 1995.
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Shmelev, O.Y. Relative measurements of the velocity and attenuation of ultrasound in highly absorbing liquids. Meas Tech 38, 118–120 (1995). https://doi.org/10.1007/BF00976759
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DOI: https://doi.org/10.1007/BF00976759