Adaptive Noise Cancellation in the Intercept Time-Slowness Domain for Eliminating Ultrasonic Crosstalk in a Transducer Array

Nguyen, Khang; Le, Lawrence H.; Sacchi, Mauricio D.; Huynh, Linh Quang; Lou, Edmond

doi:10.1007/978-3-319-11776-8_8

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The second method is based on corrective electrical excitations applied to the array's elements to minimize the parasitic displacements and thus reducing crosstalk [26][27][28][29]. The last approach concerns specific treatments realized on the excitation and reception signals to minimize crosstalk [17,30]. Finally, to improve the sensitivity of the transducer arrays, several research works are dedicated to the minimization of the electrical impedance of the array's elements using multilayer technology [31][32][33].…”

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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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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“…The second approach consists of developing a systematic method for the active cancellation of crosstalk. The last method concerns specific treatments realized on the excitation and reception signals to reduce crosstalk [22][23]. The active cancellation of crosstalk is based on the application of adequate voltages to the elements adjacent to the excited one, to minimize the parasitic signals (crosstalk).…”

Section: Introductionmentioning

confidence: 99%

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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Effects of the electrical limit conditions on the electromechanical behavior of piezoelectric transducer arrays

Bybi

Ammar

Garoum

et al. 2020

2020 International Conference on Electrical and Information Technologies (ICEIT)

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Adaptive Noise Cancellation in the Intercept Time-Slowness Domain for Eliminating Ultrasonic Crosstalk in a Transducer Array

Cited by 5 publications

References 11 publications

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

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

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

Effects of the electrical limit conditions on the electromechanical behavior of piezoelectric transducer arrays

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