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Application of Electrodynamic Acoustic Wave Transducers for Scanning Scattered Shear Wave Fields,
CORNELL UNIV ITHACA NY
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The main effort this year, however, has been devoted to an evaluation of the unique capabilities and an empirical determination of the limitations of a bulk wave EMAT when used in a scanning mode. The case chosen for evaluation is that of bulk shear wave scattering from a defect, a case of obvious practical importance which eventually will make use of the scan rate advantage inherent in the non-contact technology. The scanned receiving transducers used in this work are similar to those used to obtain quantitative radiation pattern measurements in the previous study. Good qualitative scattering results are obtained in this work. The deviations from theoretical expectations are an example of resolution limitations of this kind of transducer discussed in this report and also in the report of PROJECT I, UNIT I, TASK 1.
APPROVED FOR PUBLIC RELEASE