Analysis and optimization of Love wave liquid sensors

Author

Jakoby, Bernhard ; Vellekoop, Michael J.

Author_Institution

Electron. Instrum. Lab., Delft Univ. of Technol., Netherlands

Volume

45

Issue

5

fYear

1998

Firstpage

1293

Lastpage

1302

Abstract

Love wave sensors are highly sensitive microacoustic devices, which are well suited for liquid sensing applications thanks to the shear polarization of the wave. The sensing mechanism thereby relies on the mechanical (or acoustic) interaction of the device with the liquid. The successful utilization of Love wave devices for this purpose requires proper shielding to avoid unwanted electric interaction of the liquid with the wave and the transducers. In this work we describe the effects of this electric interaction and the proper design of a shield to prevent it. We present analysis methods, which illustrate the impact of the interaction and which help to obtain an optimized design of the proposed shield. We also present experimental results for devices that have been fabricated according to these design rules.

Keywords

Love waves; delay lines; equivalent circuits; microsensors; numerical analysis; optimisation; piezoelectric devices; shielding; Love wave liquid sensors; acoustic interaction; analysis; electric interaction; interaction; liquid sensing applications; mechanical interaction; microacoustic devices; optimized design; shear polarization; shield; shielding; Acoustic devices; Acoustic propagation; Acoustic sensors; Acoustic transducers; Chemical sensors; Electrical capacitance tomography; Liquids; Mechanical sensors; Polarization; Surface acoustic wave devices;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.726456

Filename

726456