Transducer Radiation Modeling for Ultrasonic Inspection Purposes

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1987
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Bennink, David
Mielnicka-Pate, Anna
Thompson, Donald
Thompson, R. Bruce
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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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Abstract

One of the main goals of ultrasonic inspection is to determine the absolute scattering response from a given reflector (i.e., defect). In the literature there are a number of reported successful approaches for evaluation of the absolute scattering response from spheroidal inclusions and voids [1]. These approaches were based on a measurement model that accounts for transducer diffraction effects and the scattering and propagation through liquid-solid interfaces. Approximate analytic diffraction corrections were developed for some experimental configurations, and consequently the scattering responses were deconvolved from received ultrasonic signals in an absolute sense. However, one of the important conditions for the accuracy of the deconvolution process is the proper modeling of the individual transducer diffraction characteristic. There is evidence [2,3] based upon on-axis pressure studies and C-scan profiles that considerable discrepancies can occur between individual transducers of the same diameter and nominal frequency. The main purpose of this paper is to study the acoustic characteristics of a set of three unfocused, immersion, piezoelectric, pulse-echo transducers. The analysis of transducer modeling was performed by correlating the vibrating piston theory with experimental results.

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Thu Jan 01 00:00:00 UTC 1987