Title :
Mass density sensor for liquids using ZnO-film/Al-foil Lamb wave device
Author :
Rajendran, Venkatachalam ; Koike, Masakazu ; Hashimoto, Ken-Ya ; Yamaguchi, Masatsune
Author_Institution :
Chiba Univ., Japan
Abstract :
An application of A0 mode Lamb wave devices employing ZnO-film/Al-foil composite structures to mass density sensors for liquids is discussed. By using the variational technique, the effect of liquid-loading upon A0 mode Lamb wave propagation in the device is analyzed, and a simple relation between the A0 mode Lamb wave velocity and physical conditions is derived. The results suggest that the mass density sensor could be realized by measuring the fractional change in A0 mode Lamb wave velocity. It is experimentally shown that the center frequency of the fabricated A0 mode Lamb wave device distinctly shifts due to various liquid-loading. The fractional change in the velocity is almost proportional to the mass density of liquids. The error of the measured mass density for seven different liquids is within about 5%
Keywords :
aluminium; density measurement; nonelectric sensing devices; surface acoustic wave devices; variational techniques; zinc compounds; A0 mode Lamb wave propagation; Lamb wave devices; Lamb wave velocity; ZnO-Al; center frequency; fractional change; liquid-loading; liquids; mass density sensors; variational technique; Acoustic measurements; Acoustic propagation; Acoustic sensors; Acoustic waves; Density measurement; Frequency; Insertion loss; Liquids; Sensor phenomena and characterization; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.276023
