Vol. 15, no.4, 2023
РусскийEnglish
RADIOELECTRONICS
SENSORS FOR LIQUID LEVEL AND ANALYSIS OF THERMODYNAMIC PROCESSES DURING ITS FREEZING BASED ON BULK ACOUSTIC WAVES
Vladimir I. Anisimkin, Iren E. Kuznetsova, Andrey V. Smirnov
Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, http://www.cplire.ru/
Moscow 125009, Russian Federation
E-mail: anis@cplire.ru, kuziren@yandex.ru, andre-smirnov-v@yandex.ru
Received December 01, 2023, peer-reviewed December 03, 2023, accepted December 05, 2023, published December 06, 2023.
Abstract: A fundamental property of longitudinal bulk acoustic waves (BAW) is their inability to propagate in a gaseous medium due to strong absorption in the MHz range and, on the contrary, their ability to propagate in liquids. Based on this property, a liquid level sensor based on BAW is proposed. For these purposes, for the first time, it was used not to measure changes in the velocity and attenuation of waves, but to change the time of their propagation from the emitter to the receiver. It is shown that this acoustic parameter is ideal for such measurements, since it weakly depends on temperature, but depends on the aggregate state of the propagation medium. A technique has been developed for non-contact research of exo-, endo- and isothermal processes accompanying liquid-ice and ice-liquid phase transitions. With its help, the isothermal nature of the water-ice phase transition under normal conditions was experimentally demonstrated.
Keywords: bulk acoustic waves, liquid, liquid level, exo-, endo- and isothermal processes, water-ice phase transition
PACS: 43.35.Yb
RENSIT, 2023, 15(1):361-366e DOI: 10.17725/rensit.2023.15.361
Full-text electronic version of this article - web site http://en.rensit.ru/vypuski/article/520/15(4)361-366e.pdf