| Autor: |
Chatillon, S., Cattiaux, G., Serre, M., Roy, O. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2000, Vol. 509 Issue 1, p1095, 8p, 1 Black and White Photograph, 3 Diagrams, 5 Graphs |
| Abstrakt: |
Contact ultrasonic nondestructive testing of pieces of irregular geometry faces several difficulties: sensitivity losses due to unmatched contact, inaccurate localization of defects due to transducer disorientation, uncovered scan area in the component. We propose a new concept of contact phased array transducer to improve the performances of such testing. To optimize the sensitivity of the test, the phased array has a flexible radiating surface able to fit the actual surface of the piece. The control the transmitted field, and therefore improve defects characterization, we have developed an algorithm that calculates the delay law taking into account the deformation of the radiating surface and the actual orientation of the transducer. To estimate the behavior of this new probe, the Champ-Sons model, developed at the French Atomic Energy Commission for predicting field radiated by arbitrary transducers, has been extended to sources directly in contact with pieces of irregular geometry. We present experiments obtained with a prototype of jointed transducer. The good behavior of this new type of probe, predicted by computations, are validated in transmission for several cases of irregular geometry. Further experiments in the pulse-echo mode validate the ability of the system to detect and characterize defects in pieces of irregular geometry. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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