Bessel beam ultrasonic transducer: Fabrication method and experimental results

Journal Article · Mon Nov 13 00:00:00 EST 1989 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102107· OSTI ID:5198960

Hsu, D K; Margetan, F J; Thompson, D O ^[1]

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1. Ames Laboratory, Iowa State University, Ames, Iowa 50011 (US)

We report experimental results from a first-of-a-kind ultrasonic transducer that generates a beam with a Bessel function profile. Using a technique of nonuniform poling, an axially symmetric Bessel function pattern is polarized into'' a piezoelectric ceramic element. The resulting circular-disk transducer has the usual full-plating electrode configuration, but produces an ultrasonic beam with a radial displacement profile approximating that of the Bessel function {ital J}{sub 0} ({ital r}), both in amplitude and in phase. The radiation field of a 1-in.-diam, 2.25 MHz Bessel transducer mapped out with a point probe shows good agreement with calculated results using a Gauss-Hermite model. Bessel transducers are of particular interest in attempts to achieve diffractionless'' beams.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5198960
• Journal Information: Applied Physics Letters; (USA), Vol. 55:20; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
TRANSDUCERS
FABRICATION
BESSEL FUNCTIONS
DIFFRACTION
ELECTRODES
EXPERIMENTAL DATA
PIEZOELECTRICITY
COHERENT SCATTERING
DATA
ELECTRICITY
FUNCTIONS
INFORMATION
NUMERICAL DATA
SCATTERING
440800* - Miscellaneous Instrumentation- (1990-)