A model to predict the transient radiation from segmented annular apertures radiating into solid media

Reilly, David; Hayward, G.

doi:10.1109/58.485952

Cited by 9 publications

(5 citation statements)

References 11 publications

(6 reference statements)

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“…In general, this intersection is a set of arcs of circumference (active arcs) with their centre at x 0 and radius σ(x, t): If we describe the transducer surface by a set of boundary lines, a way to proceed is finding the intersections of the boundary with the spherical wave, then computing the angles of intersections with respect to a common axis, sorting the angles and finally adding (with sign) those arcs which belong to the aperture. 14,15 Our interest is to find directly an expression for h(x, t) which is given as an addition of signed angles:…”

Section: Diffraction Impulse Response Of a Segmented Annular Transducermentioning

confidence: 99%

“…15. The time consumption has been measured for diverse field point positions and varying the sampling resolution t s .…”

Section: Accuracy Versus Computational Costmentioning

confidence: 99%

“…The approach is valid for arbitrary flat apertures with no approximations and, in fact, has already been applied to the case of segmented annular arrays. 15 However, it does not state an analytical expression for the impulse response but a calculation method which must be specified for every problem.…”

Section: Introductionmentioning

confidence: 99%

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Computation of the Ultrasonic Field Radiated by Segmented-Annular Arrays

Martínez-Graullera

Ullate

MONTERO³

2001

J. Comp. Acous.

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A method for computing the ultrasonic field radiated from segmented annular arrays is presented. Using the well known convolution-impulse response approach, an analytical expression for the spatial impulse response velocity potential from a segmented annular transducer valid for all spatial points is obtained. The array field is then calculated by superposition. The proposed solution allows us to predict transient and continuous wave pressure fields from segmented annular arrays without requiring any far-field or paraxial approximation. In order to evaluate the proposed method, an analysis of efficiency versus accuracy of the computational results is also incorporated.

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Section: Diffraction Impulse Response Of a Segmented Annular Transducermentioning

confidence: 99%

“…15. The time consumption has been measured for diverse field point positions and varying the sampling resolution t s .…”

Section: Accuracy Versus Computational Costmentioning

confidence: 99%

See 1 more Smart Citation

Computation of the Ultrasonic Field Radiated by Segmented-Annular Arrays

Martínez-Graullera

Ullate

MONTERO³

2001

J. Comp. Acous.

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“…While such construction details are not exactly new (e.g. [10]), this method of construction is not widely used, but is of broad utility because of the opportunity to integrate electronics and minimize interconnecting wiring.…”

Section: Methodsmentioning

confidence: 99%

An ultrasonic array sensor for spacecraft leak direction finding

et al. 2006

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We have developed an ultrasonic array sensor useable for locating air leaks in manned spacecraft and have found that this sensor locates leaks in a 1-m 2 plate to within 2 cm. The sensor consists of a 63-element multiplexed array plus a reference element, all constructed from a single PZT disc and a printed circuit board. Cross-correlations of signals from the array elements with signals from the single reference element provide a measurement of the leak noise passing through the spacecraft skin under the array. A spatial Fourier transform reveals the dominant direction of propagation. Triangulation from multiple sensor locations can be used to find the source of the leak. We have developed an ultrasonic array sensor useable for locating air leaks in manned spacecraft and have found that this sensor locates leaks in a 1-m 2 plate to within 2 cm. The sensor consists of a 63-element multiplexed array plus a reference element, all constructed from a single PZT disc and a printed circuit board. Cross-correlations of signals from the array elements with signals from the single reference element provide a measurement of the leak noise passing through the spacecraft skin under the array. A spatial Fourier transform reveals the dominant direction of propagation. Triangulation from multiple sensor locations can be used to find the source of the leak.

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“…1), because, with these conditions, the beam properties are nearly optimized [14]. Computing methods for SA arrays based on the well-known spatial impulse response approach [16] are presented in [17], [18]. A theoretical description of the beam radiated by a single segmented annulus can be found in [19], [20].…”

mentioning

confidence: 99%

Beam Steering with Segmented Annular Arrays

Ullate¹,

Godoy

Martínez-Graullera

et al. 2006

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Abstract-Two-dimensional (2-D) arrays of squared matrix have maximum periodicity in their main directions; consequently, they require half wavelength ( =2), interelement spacing to avoid grating lobes. This condition gives rise to well-known problems derived from the huge number of array elements and from their small size. In contrast, 2-D arrays with curvilinear configuration produce lower grating lobes and, therefore, allow the element size to be increased beyond =2. Using larger elements, these arrays have the advantage of reducing the number of elements and of increasing the signal-to-noise ratio (SNR).In this paper, the beamforming properties of segmented annular phased arrays are theoretically analyzed and compared with the equivalent squared matrix array. In the first part, point-like elements are considered in order to facilitate the field analysis with respect to the array structure. Afterward, the effect of the element size on the steered beam properties also is presented.In the examples, it is shown that the segmented annular array has notably lower grating lobes than the equivalent squared matrix array and that it is possible to design segmented annular arrays with interelement distance higher than whose beam characteristics are perfectly valid for volumetric imaging applications.

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A model to predict the transient radiation from segmented annular apertures radiating into solid media

Cited by 9 publications

References 11 publications

Computation of the Ultrasonic Field Radiated by Segmented-Annular Arrays

Computation of the Ultrasonic Field Radiated by Segmented-Annular Arrays

An ultrasonic array sensor for spacecraft leak direction finding

Beam Steering with Segmented Annular Arrays

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