Proceedings ArticleDOI
Development of a Divided Ring Array for Three-Dimensional Beam Steering in Ultrasonic Nondestructive Testing
H.-P. Schwarz
- pp 859-862
TLDR
In this article, a 2 MHz divided-ring array for nondestructive testing (NDT) application with two rings, 48 elements, and an aperture of 30 mm is presented.Abstract:
This paper focuses on a newly developed device based on a 2 MHz divided-ring array for nondestructive testing (NDT) application with two rings, 48 elements, and an aperture of 30 mm. Using this array, it is possible to steer an ultrasound beam three-dimensionally in space within a range of * 45 degrees (longitudinal-wave excitation) and * 30-70 degrees (shear-wave excitation). Computations of the directivity pattern, the process of the theoretical optimization, experiments, and a defect reconstruction will be described. One example of a defect reconstruction has been performed representatively, illustrating that the image quality of the first prototype is improved when it is compared to linear array images because of the higher lateral resolution in elevation direction.read more
Citations
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Journal ArticleDOI
Optimum beam steering of linear phased arrays
Shi-Chang Wooh,Yijun Shi +1 more
TL;DR: In this article, a model was developed to compute acoustic pressure distribution of the waves radiated from an ultrasonic linear phased array, and beam directivity and steerability were studied for various transducer parameters such as number of elements, inter-element spacing, element width, and transducers frequency.
Journal ArticleDOI
Influence of phased array element size on beam steering behavior
Shi-Chang Wooh,Yijun Shi +1 more
TL;DR: In this article, the influence of element width on the ultrasonic beam steering properties was investigated and the beam directivity patterns were analyzed and used as the criteria for determining optimal transducer design parameters.
Journal ArticleDOI
Experimental Study of Phased Array Beam Steering Characteristics
TL;DR: In this paper, the influence of several geometric parameters of linear phased arrays was studied and a systematic approach using an automated testing assembly was used to assess the steering performance of the array in a solid medium.
Journal ArticleDOI
A parametric study of ultrasonic beam profiles for a linear phased array transducer
Joon-Hyun Lee,Sang-Woo Choi +1 more
TL;DR: A numerical simulation model is presented to investigate the influences of design parameters of linear phased array transducers on beam focusing and steering performance and the characteristic of ultrasonic beam profiles has been simulated on the basis of the Huygen's superposition principle.
Proceedings ArticleDOI
A spiral 2D phased array for 3D imaging
TL;DR: In this paper, simulation results suggest that 2D arrays constructed by arranging N elements in an exponential spiral, while achieving comparable beam widths, have smaller grating lobes and produce more symmetric point spread functions than random and periodic sparse arrays operating under similar conditions.
References
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Journal ArticleDOI
A Current Distribution for Broadside Arrays Which Optimizes the Relationship between Beam Width and Side-Lobe Level
TL;DR: In this article, a one-parameter family of current distributions for symmetric broadside arrays of equally spaced point sources energized in phase was derived, and design curves relating the value of the parameter to side-lobe level as well as the relative current values expressed as a function of side lobe level were given for the cases of 8-, 12-, 16-, 20-, and 24-element linear arrays.