1. Sensitivity of detection: it has been increased significantly and corrosion pits of a few tenths of millimeters only can now be detected.
2. Interpretation of recordings: important studies of signal processing have been carried out in order to improve the discrimination of crack echoes from those coming from the various elements in contact with the retaining ring (shape echoes). The results are presented in the form of a C-Scan cartography and Figure 1 shows how the interpretation is made easier.Other developments are in progress in order to identify the origin of all echoes, thanks to an expert system which takes account of many observations made on the various signals.
3. Rapidity of acquisition and processing: the computer part of the TURBO-ROTOSCAN system is being completely modernized in order to benefit from the calculation and storage capacities of the present micro-computing.
The new version of the TURBO-ROTOSCAN will allow the retaining ring inspection duration to be divided by 3, while storing 200 times as many pieces of information as in the initial equipment. The detection sensitivity has also been increased by a factor 3 and the diagnosis will be made in real time, so as to be informed of the retaining ring state as soon as the end of its inspection.
 a) Rough recording - - b) Processed recording Figure 1: C-Scan cartography of a corroded retaining ring. |
Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00
Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:
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