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Novel conventional and phased array angle beam probes with the same DGS

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Abstract

The DGS method has been developed for planar disk shaped straight beam transducers generating a rotational symmetric sound distribution in the test material. Angle beam probes using circular or rectangular transducers generate an asymmetric sound field due to the refraction between the wedge and the test material. Today in many test procedures the use of angle beam probes is required. These probes are often equipped with rectangular transducers having the shorter dimension in the plane of incidence, which adds additional asymmetry to the sound field. Despite these facts the measurement results of current angle beam probes are evaluated using the DGS method. Even using correction factors described in literature to compensate for the rectangular transducer will not result in an accurate DGS evaluation. This fact has recently been proven by extensive measurements on test blocks with flat-bottomed holes (FBH). With modern ultrasonic instruments the calculated equivalent reflector size is displayed digitally. But even these instruments do not consider the asymmetric sound field of angle beam probes. In this paper a new approach for conventional and phased array angle beam probes based on numerical modeling is introduced, which avoids the asymmetric sound field in the test material leading to significant higher DGS accuracy

Topics: DGS, phased array angle beam probe, numerical simulation, modeling, sizing precision
Year: 2014
OAI identifier: oai:CiteSeerX.psu:10.1.1.415.326
Provided by: CiteSeerX
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