One-dimensional equivalent circuit for ultrasonic transducer arrays

Bybi, Abdelmajid; Mouhat, Ouadia; Garoum, Mohammed; Drissi, Hilal; Grondel, Sébastien

doi:10.1016/j.apacoust.2019.07.011

Cited by 18 publications

(13 citation statements)

References 19 publications

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“…7, the resonance frequencies (minimum of impedance) correspond also to the mechanical resonance frequencies (maximum of displacement). In our previous work [7], it was demonstrated that this representation is more accurate in the vicinity of the considered resonant frequency (thickness resonance). According to the equivalent circuit, it is clear that when the element 2 is grounded, its static capacitance C 02 is short-circuited, i.e.…”

Section: Electrical Impedancementioning

confidence: 98%

“…The major objective of ongoing and future research in this area is to optimize the electroacoustic performance of these transducers, to obtain a high image resolution for more reliable and safe diagnostics. For this purpose, several works investigate the crosstalk phenomenon, which decreases the performance of the ultrasonic transducer arrays [6][7][8][9][10][11][12][13][14]. Indeed, when one element of a transducer array is driven, it generates parasitic voltages and/or displacement fields on the passive neighboring elements, which affects the performance of these devices.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, Bybi et al [7,27] proposed another simple electrical method to cancel crosstalk in acoustical arrays, using the analogy between the motional current and normal displacement.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the electrical limit conditions effects in piezoelectric transducer arrays utilized in medical imaging

et al. 2020

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Crosstalk is considered as an undesirable phenomenon disturbing the electromechanical behavior of the ultrasonic transducer arrays used in medical imaging applications. Indeed, when one element of a transducer array is excited, it generates parasitic voltages and/or displacement fields on the adjacent passive elements. Consequently, these interactions between elements decrease the array's electroacoustic performance, which affects the obtained image quality. To overcome the crosstalk's problem, several research works propose active cancellation techniques. In this case, the correction voltages are determined by considering the array's elements grounded, contrary to the conventional crosstalk's definition which considers the array elements in Open-Circuit. The novelty of this paper is in one hand the study of the electrical limit conditions' effects on the physical behavior of a piezoelectric transducer array radiating in a fluid medium (water). On the other hand, a displacement method is proposed to evaluate the crosstalk level when the array elements are grounded. The limitations of the proposed method are also discussed. For this purpose, a piezoelectric transducer array is firstly modeled using a Two-dimensional Finite Elements Method (FEM), when the array elements are not grounded (open-circuit). Then, the results are compared to those obtained when the neighboring elements are grounded (as in the case of the crosstalk's active cancellation techniques).Finally, measurements are realized on a fabricated transducer array vibrating in air medium and are successfully compared to the results predicted using FEM.

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Section: Electrical Impedancementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Investigation of the electrical limit conditions effects in piezoelectric transducer arrays utilized in medical imaging

et al. 2020

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“…Similarly, silicon micro-machined transducers such as CMUT transducer arrays have been developed to replace conventional piezo-ceramic arrays, and thus electronic devices could be integrated on the same substrate [11][12][13][14]. Several works also focus on the understanding and minimization of the crosstalk phenomenon, which creates artifacts and decreases the quality of the obtained images [15][16][17][18]. In this context, several approaches have been adopted.…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of A Piezoelectric Transducer Array Taking into Account Crosstalk Phenomenon

Bybi

Khouili

Granger

et al. 2020

Int. j. eng. technol. innov.

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Ultrasonic transducer arrays are generally composed of several piezoelectric elements arranged in 1D or 2D ways. Crosstalk is an undesirable phenomenon decreasing the performance of these devices. It generates parasitic displacements at the elements' radiating surfaces, which changes the directivity of the array. Furthermore, the transducer's displacement plays a critical role in terms of the focal area and transferred intensities. The objective of this paper is to characterize a piezoelectric array composed of seven-elements made of PZ 27 ceramic experimentally. It investigates the effects of the crosstalk phenomenon on the array's performance in particular. The results have shown that the array's elements vibrate mainly in thickness mode, but the displacement is not uniform along their length due to the contribution of a parasitic length mode. Moreover, the major parasitic displacements are obtained on the neighboring passive elements: about -7.3 dB, -11 dB, and -12 dB, on the first, the second, and the third elements, respectively.

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“…Martin derived the equivalent circuit of the longitudinally polarized thin-walled ferroelectric ceramic tube in a longitudinal vibration [ 27 ]. Until now, some basic piezoelectric vibrators have had corresponding electromechanical equivalent circuits [ 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis on the Radial Vibration of Longitudinally Polarized Radial Composite Tubular Transducer

Wang

Lin

2020

Sensors

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The radial vibration of a radial composite tubular transducer with a large radiation range and power capacity is studied. The transducer is composed of a longitudinally polarized piezoelectric ceramic tube and a coaxial outer metal tube. Assuming that the longitudinal length is much larger than the radius, the electromechanical equivalent circuits of the radial vibration of a piezoelectric ceramic long tube and a metal long tube are derived and obtained for the first time following the plane strain theory. As per the condition of the continuous forces and displacements of two contact surfaces, the electromechanical equivalent circuit of the tubular transducer is obtained. The radial resonance/anti-resonance frequency equation and the expression of the effective electromechanical coupling coefficient are obtained. Then, the effects of the radial geometry dimension of the transducer on the vibration characteristics are analyzed. The theoretical resonance frequencies, anti-resonance frequencies, and the effective electromechanical coupling coefficients at the fundamental mode and the second mode are in good agreement with the finite element analysis (FEA) results. The study shows that when the overall size of the transducer is unchanged, as the proportion of piezoelectric ceramic increases, the radial resonance/anti-resonance frequency and the effective electromechanical coupling coefficient of the transducer at the fundamental mode and the second mode have certain characteristics. The radial composite tubular transducer is expected to be used in high-power ultrasonic wastewater treatment, ultrasonic degradation, and underwater acoustics, as well as other high-power ultrasonic fields.

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One-dimensional equivalent circuit for ultrasonic transducer arrays

Cited by 18 publications

References 19 publications

Investigation of the electrical limit conditions effects in piezoelectric transducer arrays utilized in medical imaging

Investigation of the electrical limit conditions effects in piezoelectric transducer arrays utilized in medical imaging

Experimental Characterization of A Piezoelectric Transducer Array Taking into Account Crosstalk Phenomenon

Analysis on the Radial Vibration of Longitudinally Polarized Radial Composite Tubular Transducer

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