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.

Experimental investigation of inter-element isolation in a medical array transducer at various manufacturing stages / Marinozzi, Franco; Bini, Fabiano; Grandoni, Andrea. - In: ULTRASONIC IMAGING. - ISSN 0161-7346. - 39:1(2017), pp. 62-74. [10.1177/0161734615595351]

Experimental investigation of inter-element isolation in a medical array transducer at various manufacturing stages

MARINOZZI, Franco
;
BINI, FABIANO;
2017

Abstract

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.
2017
array transducers; inter-element cross-coupling; laser doppler vibrometry; manufacturing process
01 Pubblicazione su rivista::01a Articolo in rivista
Experimental investigation of inter-element isolation in a medical array transducer at various manufacturing stages / Marinozzi, Franco; Bini, Fabiano; Grandoni, Andrea. - In: ULTRASONIC IMAGING. - ISSN 0161-7346. - 39:1(2017), pp. 62-74. [10.1177/0161734615595351]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/836720
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