Development of a PC-Based Signal Processing Unit for Nondestructive Testing: The ALC and Small Angle B-Scan Techniques
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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.
When ultrasonic waves are reflected from acoustic discontinuities in materials, the shape of these echoes remains basically the same. The amplitudes and the arrival times of these pulses, however, will vary. Accordingly, to characterize the location and the severity of the flaws, one only needs to describe each reflected echo by two representative parameters: the time-of-flight values and the maximum amplitudes of the reflected echoes. Making use of the special characteristics of these two parameters, new testing procedures are introduced in this study to size flaws that are parallel to the sample surface and to detect defects in acoustically noisy materials.