Reflections Properties of Focused Ultrasonic Fields
Rainer Boehm, Anton Erhard, Berlin; Thomas Rehfeldt; Erlangen
ABSTRACT The present contribution focuses on the estimation of the influence of different acoustic field and reflector parameters on the echo height using a computer model as result of several experiments about high-resolution ultrasonic evaluation with focusing probes. A matter of particular interest is the behaviour of test reflectors like circular disks (flat bottom holes) and side drilled holes in focused and defocused acoustic fields which are the result of the influence of curved structural components. In those cases distance amplitude correction curves (DAC) can be arithmetically generated depending on the kind of reflector. Therefore the experimental investigation can be considerably reduced. The further development of the ultrasonic sound fields model represents a substantial improvement, which allows an easier and optimised design of phased array probes for a given application. The comparison of the theoretical and experimental results obtained validates the model.
Publication Source: Materialprüfung, ISSN: 0025-5300
Issue: 2004-1/2, pp -
Publisher: Carl Hanser Verlag München
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