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Title |
Nondestructive Diagnosis of NPP Piping System Using Ultrasonic Wave Imaging Technique Based on a Pulsed Laser Scanning System
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Keywords |
배관 구조물 ; 비접촉 비파괴 검사 시스템 ; 초음파 전파 영상 ; Q-Switch 레이저 가진 시스템 ; wavenumber 필터링 ; 손상 영상 Pipeline structures ; Noncontact NDT ; Ultrasonic wave propagation image ; Q-switched laser system ; Wave-number filtering ; Flaw image |
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Abstract |
A noncontact nondestructive testing (NDT) method is proposed to detect the damage of pipeline structures and to identify the location of the damage. To achieve this goal, a scanning laser source actuation technique is utilized to generate a guided wave and scans a specific area to find damage location more precisely. The ND: YAG pulsed laser is used to generate Lamb wave and a piezoelectric sensor is installed to measure the structural responses. The measured responses are analyzed using three dimensional Fourier transformation (3DFT). The damage-sensitive features are extracted by wavenumber filtering based on the 3D FT. Then, flaw imaging techniques of a pipeline structures is conducted using the damage-sensitive features. Finally, the pipes with notches are investigated to verify the effectiveness and the robustness of the proposed NDT approach.
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