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- 저자 : Donatella Cerniglia (검색결과 1 건)
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레이저와 공기결합 트랜스듀서를 이용한 비접촉식 초음파 비파괴 평가/검사
장경영(Kyung Young Jhang),김홍준(Hong Joon Kim),Donatella Cerniglia,Boro Djordjevic 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
Ultrasonic NDE/I methods have been demonstrated as very effective tool in characterization of cracks and structural defects such as bond-line failures. Most of the ultrasonic testing is performed using conventional contact ultrasonic transducers that cannot be readily adapted to automation and field application. Also for large area inspection contact type is time consuming and as a result, it is important to develop a rapid and more efficient ultrasonic technique. in this paper, laser generation and air-coupled detection of ultrasound is proposed as a solution of non-contact method with no requirement of a coupling medium, and the bond quality of adhesively bonded and riveted aluminum lap splice joints is investigated as an application. A Q-switched Nd:YAG laser and a periodic transmission mask are used to generate a selected Lamb mode. The experimental show that multi-line laser source produces significant directed ultrasound and that the presence of defects can be detected. reliably from the attenuation of signal amplitude. These results demonstrate that the proposed technique is well suitable and flexible for non-contact NDE/I applications.
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