Extension of the crosstalk cancellation method in ultrasonic transducer arrays from the harmonic regime to the transient one

Bybi, Abdelmajid; Grondel, Sébastien; Assaad, Jamal; Hladky‐Hennion, Anne‐Christine

doi:10.1016/j.ultras.2013.09.007

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…By applying a finite element algorithm to determine the electrical voltages of neighboring elements, Cugnet [6] Measurement Science and Technology Design of a fast echo matching algorithm to reduce crosstalk with Doppler shifts in ultrasonic ranging numer ically optimized the far-field directivity of an individual array element . After that, Bybi [7,8] not only verified the validity of Cugent's method for crosstalk correction experimentally, but also pointed out its applicability in large frequency bands. Improved directivity can reduce crosstalk from neighboring sensors (inside), but has limited effects for reducing crosstalk by sensors from different arrays (outside).…”

Section: Introductionmentioning

confidence: 82%

“…During coding, we initially consider m 0 = m 1 = 16 (in fact, m 0 > m 1 will benefit restraining echo trailing but increase calcul ation cost), and by substituting T p = 25 μs, c = 341.7 m s −1 , D = 10 m, into equations (7) and (8), N and T can be estimated as 150 and 60 ms, respectively.…”

Section: Experimental Layoutmentioning

confidence: 99%

“…Since the self-interference can be mostly canceled by structural optimization, the crosstalk is generally more responsible for calculating wrong distances under low-speed conditions. Researchers have developed methods to eliminate crosstalk from different views, such as directivity [6][7][8], echo matching [9,10], and sequence design [11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Design of a fast echo matching algorithm to reduce crosstalk with Doppler shifts in ultrasonic ranging

Liu

Guo

2017

Meas. Sci. Technol.

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2017). Design of a fast echo matching algorithm to reduce crosstalk with Doppler shifts in ultrasonic ranging. Measurement Science and Technology, 28(2), [025103]. AbstractCrosstalk is a main factor for wrong distance measurement by ultrasonic sensors, and this problem becomes more difficult to deal with under Doppler effects. In this paper, crosstalk reduction with Doppler shifts on small platforms is focused on, and a fast echo matching algorithm (FEMA) is proposed on the basis of chaotic sequences and pulse coding technology, then verified through applying it to match practical echoes. Finally, we introduce how to select both better mapping methods for chaotic sequences, and algorithm parameters for higher achievable maximum of cross-correlation peaks. The results indicate the following: logistic mapping is preferred to generate good chaotic sequences, with high autocorrelation even when the length is very limited; FEMA can not only match echoes and calculate distance accurately with an error degree mostly below 5%, but also generates nearly the same calculation cost level for static or kinematic ranging, much lower than that by direct Doppler compensation (DDC) with the same frequency compensation step; The sensitivity to threshold value selection and performance of FEMA depend significantly on the achievable maximum of cross-correlation peaks, and a higher peak is preferred, which can be considered as a criterion for algorithm parameter optimization under practical conditions.

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Section: Introductionmentioning

confidence: 82%

Section: Experimental Layoutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of a fast echo matching algorithm to reduce crosstalk with Doppler shifts in ultrasonic ranging

Liu

Guo

2017

Meas. Sci. Technol.

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“…Real-time imaging performance deteriorates with inter-element cross-coupling, which decreases the sensitivity and angular directivity, and increases the acoustic noise level. Many researchers have investigated this phenomenon with various prototypes 1-8 over the years.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Inter-element Isolation in a Medical Array Transducer at Various Manufacturing Stages

Marinozzi

Bini

Grandoni³

2016

Ultrason Imaging

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This work presents the experimental investigation of vibration maps of a linear array transducer with 192 piezoelements by means of a laser Doppler vibrometer at various manufacturing finishing steps in air and in water. Over the years, many researchers have investigated cross-coupling in fabricated prototypes but not in arrays at various manufacturing stages. Only the central element of the array was driven at its working frequency of 5 MHz. The experimental results showed that the contributions of cross-coupling depend on the elements of the acoustic stack: Lead Zirconate Titanate (PZT), kerf, filler, matching layer, and lens. The oscillation amplitudes spanned from (6 ± 38%) nm to (110 ± 40%) nm when the energized element was tested in air and from (6 ± 57%) nm to (80 ± 67%) nm when measurements were obtained under water. The best inter-element isolation of -22 dB was measured in air after cutting the kerfs, whereas the poorest isolation was -2 dB under water with an acoustic lens (complete acoustic stack). The vibration pattern in water showed a higher standard deviation on the displacement measurements than the one obtained in air, due to the influence of acousto-optic interactions. The amount increased to 30% in water, as estimated by a comparison with the measurements in air. This work describes a valuable method for manufacturers to investigate the correspondence between the manufacturing process and the quantitative evaluations of the resulting effects.

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The Study on Broad Directivity Characteristic of Piston Transducer with Finite Baffle

Qin

Wang

et al. 2014

AMM

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Transducer with large directivity and high transmitting sensitivity is designed and fabricated. It is a sandwich transducer with composite horn and it has a finite baffle. A novel model considering the dimension of baffle is deduced, the directivity of transducers are calculated under different conditions. The computations of models agree with the experimental data well. The maximum transmitting voltage response level of the sandwich transducer is 143dB (1V/μPa) and the directivity is up to 99°(-3dB) at the resonance frequency of 75.6kHz.

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Extension of the crosstalk cancellation method in ultrasonic transducer arrays from the harmonic regime to the transient one

Cited by 3 publications

References 11 publications

Design of a fast echo matching algorithm to reduce crosstalk with Doppler shifts in ultrasonic ranging

Design of a fast echo matching algorithm to reduce crosstalk with Doppler shifts in ultrasonic ranging

Experimental Investigation of Inter-element Isolation in a Medical Array Transducer at Various Manufacturing Stages

The Study on Broad Directivity Characteristic of Piston Transducer with Finite Baffle

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