NDLI: P3R-6 A Lumped Circuit Model for the Mutual Radiation Impedance of Acoustic Array Elements

Content Provider	IEEE Xplore Digital Library
Author	Yamaner, F.Y. Bozkurt, A.
Copyright Year	2006
Description	Author affiliation: Acoust. Group, Sabanci Univ., Istanbul (Yamaner, F.Y.; Bozkurt, A.)
Abstract	Closely spaced transducer elements used in ultrasonic imaging suffer from cross-coupling via the fluid medium. Circuit models for transducer elements in ultrasonic arrays have to account for the coupling effect for an accurate representation of their radiation impedance. In this paper, we present a circuit model for the cross-coupling effects among capacitive micromachined ultrasonic transducer (cMUT) elements. Using the finite element method (FEM) we first show that the mutual radiation impedance of cMUT cells with a physical distance much smaller that the acoustic wavelength obey the analytic results derived for plane piston transducers. Then, we show that this mutual impedance can be modeled by an electrical RLC tank circuit suitable to be used in general circuit simulators. The circuit shows 80% percent accuracy in between 5 to 15 MHz for a cMUT resonant frequency of 11.8 MHz. Found element values for R, L and, C components are 0.268 mOmega, 4.156 pH and, 49.946 muF respectively. We then combine this circuit with a previously proposed model for the self radiation impedance of a cMUT cell to yield an equivalent circuit representation that accounts for the cross-coupling effect. The proposed equivalent circuit proves itself to be useful in the analysis of transceiver front-end integrated circuits where an accurate transducer model is compulsory for optimizing circuit performance
Starting Page	2385
Ending Page	2388
File Size	658138
Page Count	4
File Format	PDF
ISBN	1424402018
ISSN	10510117
DOI	10.1109/ULTSYM.2006.295
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-02
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Acoustic arrays RLC circuits Ultrasonic transducers Acoustic transducers Ultrasonic transducer arrays Equivalent circuits Integrated circuit modeling Ultrasonic imaging Coupling circuits
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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