Transmission and reception of short ultrasonic pulses by circular and square transducers

Hayman, A.J.; Weight, J.P.

doi:10.1121/1.383415

Cited by 54 publications

(16 citation statements)

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“…The analysis of experimental results showed that field point waveforms and transmitter-receiver mode responses are in reasonable agreement with theoretical results calculated assuming ideal piston behaviour of the transducer [1,2]. These studies had also demonstrated the presence of the plane and edge waves in the radiated field [1][2][3][4][5][6].…”

Section: Generalized Spatial Pulse Response Function Approachsupporting

confidence: 60%

Simulation of ultrasonic fields propagating through nonparallel boundaries

Kažys¹,

Mažeika²,

Jasiūnienė³

2004

Lith. J. Phys.

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The main objective of this paper is to present an efficient method suitable for simulation of ultrasonic fields radiated through the layers with nonparallel boundaries. The proposed method enables fast calculation of an ultrasonic disk-shaped transducer field transmitted through parallel and nonparallel boundaries between layers. The proposed simulation method is based on transformation of a multilayered medium into a virtual one without internal boundaries, equivalent to the actual medium from the point of view of the relative times of arrival of direct and edge waves. Such an approach enables one to exploit the modified axially symmetric model and to simplify the computations essentially. The example of simulated fields is presented for the case of plastic materials.

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Section: Generalized Spatial Pulse Response Function Approachsupporting

confidence: 60%

Simulation of ultrasonic fields propagating through nonparallel boundaries

Kažys¹,

Mažeika²,

Jasiūnienė³

2004

Lith. J. Phys.

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“…Experimental observations of the pulsed field of a circular ultrasonic transducer have shown that measured fields are in good agreement with theoretical results, calculated assuming an ideal piston behavior. 4,5 These studies have also demonstrated that the radiated fields consist of plane and edge waves.…”

Section: Introductionmentioning

confidence: 94%

Simulation of ultrasonic fields radiated by a circular source through a layer with nonparallel boundaries

Jasiūnienė

Mažeika

Kažys

2006

The Journal of the Acoustical Society of America

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Active elements of ultrasonic transducers are separated from the medium by thick protective layers, which may have nonparallel front and back surfaces. The objective of this work was to develop a simple method suitable for fast calculation of ultrasonic fields radiated through a layer with parallel or nonparallel boundaries and enabling one to take into account multiple reflections inside the layer. The main presumption of the proposed method is the following: after refraction at the boundary between two media, the ultrasonic field consists of plane and edge waves as before refraction. The proposed simulation method is based on transformation of a multi-layered medium into a virtual one without internal boundaries and equivalent to the actual medium from the point of a view of the times of flight of the direct plane and edge waves. The method enables simulation of radiated ultrasonic fields even after multiple reflections within the layer with parallel or nonparallel boundaries. The examples of simulated and experimentally measured ultrasonic fields of the transducer with a nonparallel front surface of protection layer, radiating into the water, are presented.

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“…An example of pul sed wave propagat ion into a three layered system which includes Voigt-type damping is shown in Figure ( field is seen to be similar to that given by square ultrasonic transducers which include both plane and edge wave components [6]. The interaction of curved wave fronts with layers is further complicated in that mode-conversion is then important.…”

Section: Forward Models: Finite Differencementioning

confidence: 99%