TWO UTILIZATIONS OF OPEN RESONATOR CONCEPT IN NONDESTRUCTIVE TESTING

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Claes Hedberg, Sven Arnoldsson, Rikard Gunnarsson
Title: TWO UTILIZATIONS OF OPEN RESONATOR CONCEPT IN NONDESTRUCTIVE TESTING
Translated title: Två användningar av öppen-resonatorkoncept i oförstörande provning
Conference name: Tenth International Congress on Sound and Vibration
Year: 2003
Pagination: 3541-3548
Publisher: International Institute of Acoustics and Vibration
City: Stockholm
Organization: Blekinge Institute of Technology
Department: Dept. of Mechanical Engineering (Institutionen för maskinteknik)
Dept. of Mechanical Engineering S-371 79 Karlskrona
+46 455 38 50 00
http://www.ima.bth.se/
Authors e-mail: claes.hedberg@bth.se
Language: English
Abstract: 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.
Summary in Swedish: Man kan använda öppen resonator för att öka insignalen till ett objekt vid ickeberörande oförstörande provning, och man kan med öppen resonatorkoncept lokalisera ljudfältet så att man kan använda bla de extremt känsliga ickelinjära ultraljudsmetoderna vid lokalisering av skadade områden.
Subject: Mechanical Engineering\Structural Dynamics
Signal Processing\Beamforming
Mechanical Engineering\Structural Mechanics
Keywords: Nonlinear acoustics, nondestructive testing, nonlinear elastic wave spectroscopy
Edit