Improvement of Time Reversal Processing in Titanium Inspections

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1996
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Miette, Véronique
Fink, Mathias
Wu, François
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

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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We have explained in previous papers [1,2] a completely different NDE technique applied to the titanium alloy billet, the time reversal process, which allows conversion of a divergent wave issuing from a defect into a convergent wave focusing on it. The time reversal method is a self adaptive technique which produces a focussed beam matched to the defect shape and generates an unfocussed wave in the case of a speckle noise source. The results have showed the ability of this technique to focus on defects in a scattering media through a complex interface. However, this technique is subject to the principal NDE systems problem: the false alarms. Indeed, high levels of grain noise can mask signals from smaller or lower acoustic reflectivity flaws and than a grains configuration can be confused with a small defect. In case of the inspection of large titanium parts such those found in the aircraft engine industry (thickness > 5″), the classical techniques are more sensitive to this problem in the deep zones: the grain density often increases with depth du to the forging technique and the backpropagated defect echoes are weak in account of the attenuation.

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Mon Jan 01 00:00:00 UTC 1996