A flexible algorithm for layout-optimized sparse cMUT arrays

Austeng, Andreas; Kirkebo, J.E.; Holm, Sverre

doi:10.1109/ultsym.2004.1418019

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…Some groups [1], [2] propose to create sparse arrays by removing a certain percentage of the elements from a full populated array. Several techniques that have been used to obtain sparse arrays are: Random Array [3], Binned Array [4], [5], Vernier Array [1], [6], [7], and Stochastic array learning [1], [7]. These kinds of sparse arrays only pretend to reduce the number of control channels, but not consider changes in the shape and/or positions of elements.…”

Section: Introductionmentioning

confidence: 99%

“…For example capacitive micromachined ultrasonic transducer technology (cMUT) [4], [8] makes use of integrated circuit techniques for array construction, and allow us consider new geometrical patterns for large arrays with a low number of elements and distances between elements bigger than half wavelength (Ȝ/2). In [9] is shown an array based on ferroelectret technology that has been introduced for airborne ultrasonic applications.…”

Section: Introductionmentioning

confidence: 99%

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Evolutionary Technique for Designing Optimized Arrays

Villazon¹,

Ibanez²

2011

AIP Conference Proceedings

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Many ultrasonic inspection applications in the industry could benefit from the use of phased array distributions specifically designed for them. Some common design requirements are: to adapt the shape of the array to that of the part to be inspected, to use large apertures for increasing lateral resolution, to find a layout of elements that avoids artifacts produced by lateral and/or grating lobes, to maintain the total number of independent elements (and the number of control channels) as low as possible to reduce complexity and cost of the inspection system. Recent advances in transducer technology have made possible to design and build arrays whit non-regular layout of elements. In this paper we propose to use Evolutionary Algorithms to find layouts of ultrasonic arrays (whether 1D or 2D array) that approach a set of specified beampattern characteristics using a low number of elements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolutionary Technique for Designing Optimized Arrays

Villazon¹,

Ibanez²

2011

AIP Conference Proceedings

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“…Ferroelectrets and micromachined technologies are the new flexible and in case of Ferroeletrets non-expensive way for build ultrasonic transducers. Some works as [5], [6] propose a new technology for ultrasound arrays, as capacitive micromachined ultrasonic transducer (cMUT) that makes use of integrated circuit techniques for array construction, and allow us considerer new geometrical patterns for large arrays with a low number of elements separated by distances bigger than a half wavelength (λ/2). In [7] is shown an array transducer based on ferroelectret technology that has been introduced for airborne ultrasonic applications.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary algorithms for optimal ferroelectret arrays design

Villazon

Ibanez

Camacho

et al. 2009

2009 IEEE International Ultrasonics Symposium

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The common technique for suppressing grating lobes in an ultrasonic array consists in transforming a full array in a sparse array. This technique does not consider it the shape of the elements, or the distribution of a fixed number of elements around a defined space. In this work a new criteria for optimal array design is proposed, which is validated with the help of a simple array fabrication process based in ferroelectret technology. As well, the potential of ferroelectrets as active material for air-coupled ultrasonic transducer design is demonstrated.

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“…Recent developments in the transducers fabrications [11] facilitated production of non regular array layouts and with these layouts is posible to make a non regulars elements too [12]. Both non regular arrays and non regular elements have extra freedom in position and shape, that produces new array designs.…”

Section: Introductionmentioning

confidence: 99%

P1D-5 A Periodicity Break Technique in 1D Array without Eliminated Elements Using cMUTs Technology for the Layout

Villazon

Ibanez

Austeng³

2007

2007 IEEE Ultrasonics Symposium Proceedings

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The use of technologies of capacitive micromachined ultrasonic transducers (cMUTs) offers a new way of development ultrasonic transducers. They are built using standard silicon integrated circuit fabrication technology, and this permits to integrate electronic components in the probes, and a more flexible layout of the array elements. If the distribution of the elements of such arrays is periodic, and separated more than λ/2, grating lobes will appear and the maximum scan angle will be limited. The flexibility in cMUT technology allows break the periodicity of the arrays and avoids suffering of grating lobes or limitations in scan angles. In this respect, the periodicity in the distances between elements of the array is the main contribution to growing of grating lobes for this reason we propose break this periodicity, without eliminating elements in the array, in order to reduce them. In order to accomplish this goal we use genetic algorithms (NSGA-II) for the array optimization, which allows us to find a suitable layout elements reducing grating lobes

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A flexible algorithm for layout-optimized sparse cMUT arrays

Cited by 10 publications

References 10 publications

Evolutionary Technique for Designing Optimized Arrays

Evolutionary Technique for Designing Optimized Arrays

Evolutionary algorithms for optimal ferroelectret arrays design

P1D-5 A Periodicity Break Technique in 1D Array without Eliminated Elements Using cMUTs Technology for the Layout

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