Characterizing Porosity of Composite Materials Through Digital Ultrasonic Waveform Processing
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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
The method presented to detect and quantify the porosity value content of composite materials is part of a development effort to establish an integrated ultrasonic evaluation system 1. The overall research effort aims to automate the NDE process and predict mechanical and structural properties of composite materials using NDE techniques. The ultrasonic NDE technique used herein is based on digitized waveforms obtained from pulse-echo scans. For the fast integration of new algorithms into the system, a software framework was created with compatability between the signal and image processing modules. The porosity volume content of the test specimens is related to statistical properties of the ultrasonic data rather than to the ultrasonic attenuation with respect to frequency2.