Double open resonator for localized non-contact acoustic testing
| Document type: | Conference Papers |
|---|---|
| Peer reviewed: | Yes |
| Full text: | |
| Author(s): | Claes Hedberg, Kristian Haller |
| Title: | Double open resonator for localized non-contact acoustic testing |
| Translated title: | Dubbel öppen resonator för lokaliserad oberörande akustisk provning |
| Conference name: | International Congress on Acoustics, April 4-9, 2004. |
| Year: | 2004 |
| Pagination: | CD-rom |
| ISBN: | 4-9901915-6-0 |
| Publisher: | International Commission of Acoustics |
| City: | Kyoto |
| Organization: | Blekinge Institute of Technology |
| Department: | School of Engineering - Dept. of Mechanical Engineering (Sektionen för teknik – avd. för maskinteknik) School of Engineering S- 371 79 Karlskrona +46 455 38 50 00 http://www.bth.se/ing/ |
| Authors e-mail: | claes.hedberg@bth.se |
| Language: | English |
| Abstract: | There exist two concepts of open resonators that can be combined into a device for acoustic non-destructive testing. The device is non-contact and based on the fact that an airgap between a transducer surface and the test object can be set into resonance. This occurs for the conditions that makes this an open resonator (open because the air volume is not closed), and the wave field is amplified so that a larger amplitude is reached at the object surface. Let us assume that the object is a plate. When the acoustic wave enters the plate, one can let the frequency be the resonant frequency for one of the modes for the plate thickness. A limited part of the plate may be seen as a resonator, open to the sides. When the conditions for an open resonator is fulfilled for the plate thickness, the wave field will be greatly amplified within a region close to the insonified plate surface, and thus the linear or nonlinear response from this excitation is local. The device may then be used to scan the plate for material parameter changes. |
| Subject: | Mechanical Engineering\Structural Dynamics |
| Keywords: | nonlinear acoustics, localized NDT, nonlinear NDT |
