A Simple Way to Eliminate Diffraction Lobes Emitted by Ultrasonic Transducers

Martin, Franklin D.; Breazeale, M. A.

doi:10.1121/1.1912546

Cited by 48 publications

(5 citation statements)

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“…Breazeal et a1 [17] have proposed a method for generating a field which is Gaussian in one dimension using multiple linear electrodes. In a recent paper, [13 transducer is reduced, the fringing of the electric field lines and lines of mechanical stress in the piezoelectric material will produce a radial profile which approximates a Gaussian function.…”

Section: Gaussian Beam Model For Focused Ultrasoundmentioning

confidence: 99%

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An Analytical Study of Doppler Ultrasound Systems

Azimi

Kak

1985

Ultrason Imaging

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The past theoretical contributions in Doppler ultrasonic imaging have borrowed heavily from the electromagnetic case. In these contributions, most points of departure between the ultrasonic and electromagnetic cases were taken care of by heuristic incorporation of factors in the derived formulas. A theory is presented that is more complete in the sense that it specifically accounts for the diffracted fields of the transducer aperture (assumed to be a source of a Gaussian focussed beam), the interaction of these fields with the scattering sites, and the interaction of the transducer aperture with the back scattered fields. The theoretical formulation was used to perform a series of computer simulation studies on Doppler ultrasound. The control afforded by the theory over different parameters of the system has allowed us to study the effect of the different signal bandwidths, tissue attenuation constants, and the role of transducer design in the ultrasound Doppler systems.

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Section: Gaussian Beam Model For Focused Ultrasoundmentioning

confidence: 99%

“…On the contrary, the scattering function as given by Eq. (17) shifts the spectrum up to higher frequencies. Finally, the term corresponding to diffraction effects is approximately proportional to the inverse frequency (see Eqs.…”

Section: A Simlnation Study Of Pulsed Doppler Systemsmentioning

confidence: 99%

An Analytical Study of Doppler Ultrasound Systems

Azimi

Kak

1985

Ultrason Imaging

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“…Alternatively, the minimum spot could be produced by a normal probe together with another acoustical lens, which in practice can reduce the width of the generated sound to the order of A (Knollman et al 1978). Other approaches may be to exploit either the direct production of a plane wavefront from a piezoelectric plate (Lakestani et al 1976), or the low divergence of beams of Gaussian cross-section (Martin and Breazeale 1971). Ultrasonic point sources of diameter 101Am or less have been generated using lasers (Mallozzi et al 1977), and, at the expense of complexity, these sources appear most promising for observing ultrasonic caustics.…”

Section: Osao(s)mentioning

confidence: 99%

Ultrasonic caustics in non-destructive evaluation

Doyle¹

1980

J. Phys. D: Appl. Phys.

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Caustics formed in the field diffracted by defects are explored theoretically as a possible approach to the inverse scattering problem for ultrasonic non-destructive evaluation. The case of crack-like defects is considered in detail using the geometrical theory of diffraction. The involute of the far-field caustic reproduces the projection of the crack edge in the incident beam direction, for a plane incident wavefront. This purely geometrical inversion is carried out uniquely for the asteroid and its involute, the elliptical edge. For a general edge shape, the complete inversion requires one further length measurement, which may be carried out in some cases by further experiments with caustics. Useful limitations on the possible shapes of caustics are explained on the basis of catastrophe theory.

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“…Flipczynski and Etienne [2] applied Haselberg and Krautkramer's Gaussian transducer design to verify Gaussian field distribution theoretically and experimentally. Martin and Breazeale [3] reported a one-dimensional Gaussian transducer for use in Schlieren photography. A narrow strip was used as the back electrode.…”

Section: Introductionmentioning

confidence: 99%

An ultrasonic Gaussian transducer and its diffraction field: theory and practice

Huang

Breazeale

2006

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In this paper, the authors present a novel way to describe the diffraction field for a Gaussian source, which becomes a Gaussian itself. It is described by the Rayleigh surface integral based on the Huygens' theorem. The derivation does not require the parabolic approximation used by previous authors. An improved spherical button Gaussian transducer design also is presented to verify the theory. A theoretical principle of this design based on electromagnetic theory is developed. Both megahertz and kilohertz experimental results show that the sound fields generated by Gaussian transducers of this design agree very well with the theoretical predictions.

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A Simple Way to Eliminate Diffraction Lobes Emitted by Ultrasonic Transducers

Abstract: Diffraction lobes can be eliminated from the ultrasonic wave pattern emitted by an ultrasonic transducer by producing a Gaussian distribution of amplitudes across the transducer surface. A simple way to accomplish this is described.

Cited by 48 publications

References 0 publications

An Analytical Study of Doppler Ultrasound Systems

An Analytical Study of Doppler Ultrasound Systems

Ultrasonic caustics in non-destructive evaluation

An ultrasonic Gaussian transducer and its diffraction field: theory and practice

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