Sensing the properties of liquids with doubly rotated resonators

被引：15

作者：

Kim, Y ^{[1
]}

Vig, JR ^{[1
]}

Ballato, A ^{[1
]}

机构：

[1] USA, Commun Elect Command, Ft Monmouth, NJ 07703 USA

来源：

PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM | 1998年

关键词：

D O I：

10.1109/FREQ.1998.717971

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Immersion of a resonator into a liquid results in changes in the resonator's frequency and impedance. These changes have been used to characterize liquid properties. Frequency can be measured with far higher accuracy than impedance or any other quantity. The goal of the project described in this paper was to investigate whether or not it is possible to measure a liquid's properties by means of frequency measurements alone. When a doubly rotated resonator (theta approximate to 35 degrees and phi > 0 degrees) is operated in a liquid, the displacement of the surface is partly out of the plane of the plate. By controlling the phi angle, one may control the ratio of in-plane to out-of-plane displacements. The out-of-plane component of the displacement propagates a damped compressional wave into the liquid, while the in-plane component propagates a damped shear wave. The frequency changes of doubly rotated resonators have been measured in glycerol solutions of a variety of concentrations. At each concentration, the frequency change was found to increase with increasing phi angle. A method is proposed for the determination of a fluid's density, viscosity and acoustic wave velocity.

引用

页码：660 / 666

页数：7