Anomalous behavior in the radiation pattern of piezoelectric transducers induced by parasitic Lamb wave generation

Delannoy, B.; Bruneel, C.; Haine, F.; Torguet, R.

doi:10.1063/1.328171

Cited by 37 publications

(10 citation statements)

References 7 publications

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“…18,19 Reference 20 gives the dispersion curves for the five lowest-order modes propagating in a PZT-4 ceramics, whose physical properties are very similar to those of the P1-60 type ceramics used in our experiments. 16 The corresponding phase and group velocities for the piezoceramic plate under investigation are plotted in Fig. 7 against the frequency.…”

Section: A the Effect Of Lamb Waves In Continuous Regimementioning

confidence: 99%

“…We are familiar only with experiments on this point with small piezoceramic elements, when the transversal dimensions of the radiator were comparable with its thickness. 16 The measurements demonstrated severe deviations from the piston theory predictions, consisting mainly in the occurrence of parasitic sidelobes in the radiation pattern. It was shown that these lobes were due to parasitic zero-order Lamb waves propagating in the transducer and radiating into the fluid medium.…”

Section: Introductionmentioning

confidence: 97%

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Lamb waves in piezoelectric focused radiator as a reason for discrepancy between O’Neil’s formula and experiment

Cathignol

Sapozhnikov

Zhang

1997

The Journal of the Acoustical Society of America

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One of the well-known methods of ultrasound focusing is the use of a transducer having the form of a concave spherical cap. In the theoretical analysis, O’Neil’s formula is widely used, which describes acoustic pressure on the axis of the transducer under the assumption that normal velocity of its surface is uniform. Usually, it is believed that modern piezoelectric focused sources are very close to this theoretical model. The paper presented describes results of experimental investigation which showed that there exists a significant disagreement between the observed acoustic field and that predicted by the theory of O’Neil. Two types of measurements have been made to clarify this problem. The acoustic pressure field of a focused piezoceramic transducer (with aperture diameter of 100 mm, radius of curvature of 100 mm, resonance frequency of 1 MHz) has been measured in a water tank using a miniature hydrophone. In addition, the radiator surface vibration has been studied in air using an optical interferometric technique. Theoretical analysis and the measurements show that the disagreement between the theory and the experiment is due to Lamb waves, which originate at the radiator edge, propagate along the piezoceramic plate without significant attenuation, and thus radiate additional acoustic perturbations.

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Section: A the Effect Of Lamb Waves In Continuous Regimementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Lamb waves in piezoelectric focused radiator as a reason for discrepancy between O’Neil’s formula and experiment

Cathignol

Sapozhnikov

Zhang

1997

The Journal of the Acoustical Society of America

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“…Second, it is very important to take the ''true'' displacement profile of the transducer surface into account. In fact, experimental results concerning elementary transducer do not always agree with those obtained numerically using classical integrals 3,4 because the piston mode is generally assumed. Third, two kinds of interactions occur: mechanical interaction between the elementary transducers and acoustic interaction between the solid and the fluid media.…”

Section: Introductionmentioning

confidence: 85%

Radiation from finite phased and focused linear array including interaction

Assaad

Bruneel

1997

The Journal of the Acoustical Society of America

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Resultant pressure of linear arrays, consisting of N elementary transducers, are in general computed with the help of simplified assumptions for the displacement field of the transducer radiating surface. Moreover, interactions between neighboring elements are not included in most of the numerical approaches. In this paper, a new calculation scheme is proposed to compute the resultant pressure of such arrays, including interactions. For this purpose, using the finite element method ͑FEM͒, the far-field directivity pattern of a part of the array is computed using dipolar dampers and a previously described extrapolation algorithm ͓J. Assaad et al., J. Acoust. Soc. Am. 94, 562-573 ͑1993͔͒. This part is constituted of an active elementary transducer ͑electrically driven͒ mounted between 2Q passives ͑electrically grounded͒ neighboring transducers. Then, the resultant pressure of a finite phased and focused array can be obtained by summing up the far-field directivity patterns of the 2Q ϩ 1 transducers sets weighted by the classical term which takes into account the geometrical and electrical phase shifts. This new calculation scheme is then used to compute the resultant pressure of a lithium niobate linear array. It will be shown that mechanical interaction must be taken into account for high frequency arrays.

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“…Many studies have been performed to provide construction rules for the design of transducers. In practical terms, design engineers require both numerical and analytical models corresponding to the performance they want to optimize, such as sensitivity, bandwidth, cross-coupling levels, and elementary directivity pattern [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional electroacoustic model of transducer array based on 1-3 piezocomposite materials

Certon

Guyonvarch

Férin³

et al. 2006

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

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An analytical model is presented to achieve simultaneous prediction of the elementary electroacoustic response and directivity pattern of a one-dimensional (1-D) piezocomposite array. The theoretical approach was based on guided wave theory in a multilayered structure in which the 1-3 piezocomposite material is considered as a homogeneous piezoelectric plate. A matrix method was applied to simulate the displacement fields generated at the surface of the array when one element was excited with an electrical pulse. A test device was manufactured, then characterized through measurements of displacement performed with an interferometric laser probe when the array vibrated in air and in water. The experimental results are presented and compared with theory.

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Anomalous behavior in the radiation pattern of piezoelectric transducers induced by parasitic Lamb wave generation

Cited by 37 publications

References 7 publications

Lamb waves in piezoelectric focused radiator as a reason for discrepancy between O’Neil’s formula and experiment

Lamb waves in piezoelectric focused radiator as a reason for discrepancy between O’Neil’s formula and experiment

Radiation from finite phased and focused linear array including interaction

Two-dimensional electroacoustic model of transducer array based on 1-3 piezocomposite materials

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