Equivalent circuit-based analysis of CMUT cell dynamics in arrays

Date
2013
Advisor
Instructor
Source Title
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Print ISSN
0885-3010
Electronic ISSN
Publisher
IEEE
Volume
60
Issue
5
Pages
1016 - 1024
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

Capacitive micromachined ultrasonic transducers (CMUTs) are usually composed of large arrays of closely packed cells. In this work, we use an equivalent circuit model to analyze CMUT arrays with multiple cells. We study the effects of mutual acoustic interactions through the immersion medium caused by the pressure field generated by each cell acting upon the others. To do this, all the cells in the array are coupled through a radiation impedance matrix at their acoustic terminals. An accurate approximation for the mutual radiation impedance is defined between two circular cells, which can be used in large arrays to reduce computational complexity. Hence, a performance analysis of CMUT arrays can be accurately done with a circuit simulator. By using the proposed model, one can very rapidly obtain the linear frequency and nonlinear transient responses of arrays with an arbitrary number of CMUT cells. We performed several finite element method (FEM) simulations for arrays with small numbers of cells and showed that the results are very similar to those obtained by the equivalent circuit model.

Course
Other identifiers
Book Title
Keywords
Acoustic interaction, Capacitive micromachined ultrasonic transducer, Circuit simulators, Equivalent circuit model, Finite element method simulation, Nonlinear transient response, Performance analysis, Radiation impedance, Acoustic impedance, Circuit simulation, Circuit theory, Cytology, Equivalent circuits, Finite element method, Ultrasonic transducers, Cells
Citation
Published Version (Please cite this version)