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TWO UTILIZATIONS OF OPEN RESONATOR CONCEPT IN NONDESTRUCTIVE TESTING

Claes M. Hedberg,Sven Arnoldsson,Rikard Gunnarsson-2003-01-01-KTH Publication Database DiVA (KTH Royal Institute of Technology)
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TL;DRAbstract

Two ways in which the concept of open resonator can be used in connection with nondestructive evaluation will be described. In the first, a non-contact transducer's efficiency of transferring energy into an object can be increased by utilizing the resonance of the gap between the transducer and object. By choosing the gap distance, frequency and transducer width a resonant wave appears which will have a considerably larger amplitude at the object surface. Secondly, by fitting the critical parameters of open resonators for thin objects, like extended plates, the wave field inside the object can be localized. Thus some Nonlinear Elastic Wave Spectroscopy methods may be used to determine the location of damage.

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Two ways in which the concept of open resonator can be used in connection with nondestructive evaluation will be described. In the first, a non-contact transducer's efficiency of transferring energy into an object can be increased by utilizing the resonance of the gap between the transducer and object. By choosing the gap distance, frequency and transducer width a resonant wave appears which will have a considerably larger amplitude at the object surface. Secondly, by fitting the critical parameters of open resonators for thin objects, like extended plates, the wave field inside the object can be localized. Thus some Nonlinear Elastic Wave Spectroscopy methods may be used to determine the location of damage.

Keywords

TransducerResonatorAcousticsNondestructive testingOpticsObject (grammar)Energy (signal processing)Nonlinear system

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