High-frequency membrane hydrophone

Author

Lum, Paul ; Greenstein, Michael ; Grossman, Charles ; Szabo, Thomas L.

Author_Institution

Hewlett-Packard Labs., Palo Alto, CA, USA

Volume

43

Issue

4

fYear

1996

fDate

7/1/1996 12:00:00 AM

Firstpage

536

Lastpage

544

Abstract

A membrane hydrophone with a 37-/spl mu/m diameter spot poled electrode has been fabricated on a 4-/spl mu/m-thick film of the piezoelectric copolymer, polyvinylidene fluoride trifluoroethylene (PVDF-TrFE), and initially characterized. The hydrophone has an effective spot size of less than 100 /spl mu/m, an on-membrane +7-dB gain buffer amplifier, and a -3-dB bandwidth of 150 MHz. The acoustic properties of the hydrophone were investigated with a transducer equivalent circuit model, the electric fringe fields due to poling were characterized with a finite difference electrostatic field model, and the effective spot diameters 2a/sub 3/ and 2a/sub 6/ were estimated. Measurements on the bandwidth, effective spot size, and sensitivity are presented. This hydrophone appears suitable for the characterization of both the frequency and spatial parameters of high-frequency transducers such as intravascular ultrasound (IVUS) catheter transducers operating in the 10-40 MHz range.

Keywords

biomedical equipment; biomedical ultrasonics; hydrophones; ultrasonic transducers; -3 dB; 10 to 40 MHz; 150 MHz; 37 mum; 4 mum; 7 dB; effective spot size; electric fringe fields; high-frequency membrane hydrophone; intravascular ultrasound catheter transducers; medical acoustic imaging; piezoelectric copolymer film; poling; polyvinylidene fluoride trifluoroethylene; sensitivity; spot poled electrode; transducer equivalent circuit model; Acoustic transducers; Bandwidth; Biomembranes; Electrodes; Equivalent circuits; Finite difference methods; Piezoelectric films; Piezoelectric transducers; Sonar equipment; Ultrasonic transducers;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.503713

Filename

503713