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Méthodes d'inspection non destructive par ultrasons de réservoirs d'hydrogène basées sur la transformée en ondelettes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Legendre, Sylvie |
| Copyright Year | 2000 |
| Abstract | A new acoustic nondestructive method using Lamb waves as a probe is presented. These waves are generated and received by an ElectroMagnetic Acoustic Transducer (EMAT). The position of jlaws in the structure under test is computed from the time of arrivaI of the main peak of the rejlected signal. Due to the noisy nature of the received signal, we use a wavelet transform algorithm to extract the required time information . The main advantage of such a multi-scale method of signal analysis is to be suitable for peak detection problems especia//y in highly noisy environments. We explain how we proceed to do the feature extraction, and we propose two methods for reconstructing the image of the inspected structure. Resu/ts of real-world ultrasonic Lamb waves signal analysis are presented. In addition, to test the noise robustness of the method, the case of synthetic noisy signaIs is also treated. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://depot-e.uqtr.ca/6648/1/000671506.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
