Modeling of Large Aperture Transducer Focusing in Cylindrical Billets
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
This paper presents the application of beam transmission modeling to the problem of large aperture transducer focusing in cylindrical billets. This work is to aid in the design and procurement of large aperture bi-cylindrically focused transducers for use in the multi-zone billet inspection system being developed under the FAA Engine Titanium Consortium (ETC) program. Need for this work arises from 1) errors due to diffraction and focusing aberrations which occur when established optical lens formulas are employed in the design of acoustic lenses, 2) focusing errors resulting from billet surface geometric irregularities which are not readily handled by other beam model approaches.