Influence of phased array element size on beam steering behavior

Wooh, Shi-Chang; Shi, Yulei

doi:10.1016/s0041-624x(97)00164-9

Cited by 105 publications

(50 citation statements)

References 8 publications

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“…Grating lobes are lobes with an intensity similar to the main lobe intensity and are mostly unaffected by apodization. Wooh and Shi have shown that for planar arrays no grating lobes appear as long as the following condition is met 22,23 :…”

Section: The Elimination Of Grating Lobesmentioning

confidence: 99%

Simulation of a circular phased array for a portable ultrasonic polar scan

Daemen¹,

Kersemans²,

Martens³

et al. 2018

AIP Conference Proceedings

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Abstract. The development of new composite materials, often anisotropic in nature, requires intricate approaches to characterize these materials and to detect internal defects. The Ultrasonic Polar Scan (UPS) is able to achieve both goals. During an UPS experiment, a material spot is insonified at several angles ), after which the reflected or transmitted signal is recorded. While excellent results have been obtained using an in-house developed 5-axis scanner, UPS measurements with the current set-up are too lengthy and cumbersome for in-situ industrial application. Therefore, we propose to replace the complex mechanical steering of the transducers by a hemispherical phased array consisting of small PZT elements. This allows to create a compact and portable setup without compromising the current data quality. By successively activating a specific set of elements of the array and choosing appropriate inter-element time delays, the beam can be electronically steered from any angle to a fixed position on the targeted sample. Consequently, UPS reflection measurements can be performed at this position from a wide range of angles in a timeframe of seconds. Additionally, by using apodization windows, it is possible to efficiently reduce the intensity of unwanted side lobes and to create a phase profile which closely resembles that of a bounded plane wave, leading to an easier interpretation of the recorded data. The appropriate time delays and apodization parameters can be found though a multi-objective inverse problem in which both the phase profile and the side lobe reduction are optimized. This approach enables the creation of an effective beam profile to be used during UPS experiments for the characterization and inspection of composite materials. Our simulation approach is a crucial step towards a next-generation UPS device for industrial applications and in-field measurements.

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Section: The Elimination Of Grating Lobesmentioning

confidence: 99%

Simulation of a circular phased array for a portable ultrasonic polar scan

Daemen¹,

Kersemans²,

Martens³

et al. 2018

AIP Conference Proceedings

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“…For n n π 0, q correspond to so-called grating lobes 9 . Presence of grating lobes may result in measurement artefacts and/or misinterpretation.…”

Section: General Points About Phased Array Transducersmentioning

confidence: 99%

Lamb-wave beam-steering for integrated health monitoring applications

Moulin¹,

Bourasseau²,

Assaad³

et al. 2003

SPIE Proceedings

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The use of integrated Lamb wave sources (piezoelectric transducers) is known as a possible way of performing integrated, on-line health monitoring. Either omnidirectional (circular) or quasi-unidirectional (bar-shaped) transducers can be used. However both of them have their own drawbacks, which makes them not optimal. A much more satisfying solution could be the use of phase-delayed multi-element arrays to perform angular steering of the emitted Lamb wave beam. In this paper both the proper conditions and the limitations for the applicability and performance of Lamb wave beam steering using integrated piezoelectric arrays are established. Then experimental damage detection capabilities using this principle are demonstrated.

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“…The inter-element spacing is p; element width is l; total element number is N; array size is L (=N·p). In the previous studies, many great contributions to ultrasonic transducer sound field calculation have been made [2][3][4][5][6][7][8]. Wooh et al regarded each transducer element as many discrete line sources loading on the surface of a elastic half-space, to predict the ultrasound field radiated by the linear phased array [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Calculation of displacements in a half-space from a linear array based on analytical solutions of transient wave

Zhang

2017

MATEC Web Conf.

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Abstract. In this paper, we propose a theoretical calculation method for the displacements of transient wave excited by a linear array coupled to an elastic solid with a longitudinal wave couplant. Firstly, the vertical and horizontal displacements excited by a vertical line source are solved based on exact and analytical solutions of transient elastic waves induced by a line source normally acting on an elastic half-space. Secondly, in this case, the displacements from a linear array can be determined by the superposition of the solutions of a number of discrete line forces mentioned above. All the theoretical results are compared to the finite element simulation results. The theoretical results are consistent with finite element simulation data. Therefore, the calculation method can save a lot of computing time. This paper provides a fast and accurate calculation method of transient wave displacements in a half-space generated by a linear array. The calculation method can be used to explore the sound field characteristics of a linear array transducer in the future.

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Influence of phased array element size on beam steering behavior

Cited by 105 publications

References 8 publications

Simulation of a circular phased array for a portable ultrasonic polar scan

Simulation of a circular phased array for a portable ultrasonic polar scan

Lamb-wave beam-steering for integrated health monitoring applications

Calculation of displacements in a half-space from a linear array based on analytical solutions of transient wave

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