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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Smart Structures and Systems, An International Journal Smart Structures and Systems, An International Journal Vol.26 No.5
- 발행연도
- 2020.1
- 수록면
- 657 - 666 (10page)
이용수
초록· 키워드
오류제보하기
A rotational pulse-echo ultrasonic propagation imager that can inspect cylindrical specimens for material nondestructive evaluations is proposed herein. In this system, a laser-generated ultrasonic bulk wave is used for inspection, which enables a clear visualization of subsurface defects with a precise reproduction of the damage shape and size. The ultrasonic waves are generated by a Q-switched laser that impinges on the outer surface of the specimen walls. The generated waves travel through the walls and their echo is detected by a Laser Doppler Vibrometer (LDV) at the same point. To obtain the optimal Signal-to-Noise Ratio (SNR) of the measured signal, the LDV requires the sensed surface to be at a right angle to the laser beam and at a predefined constant standoff distance from the laser head. For flat specimens, these constraints can be easily satisfied by performing a raster scan using a dual-axis linear stage. However, this arrangement cannot be used for cylindrical specimens owing to their curved nature. To inspect the cylindrical specimens, a circular scan technology is newly proposed for pulse-echo laser ultrasound. A rotational stage is coupled with a single-axis linear stage to inspect the desired area of the specimen. This system arrangement ensures that the standoff distance and beam incidence angle are maintained while the cylindrical specimen is being inspected. This enables the inspection of a curved specimen while maintaining the optimal SNR. The measurement result is displayed in parallel with the on-going inspection. The inspection data used in scanning are mapped from rotational coordinates to linear coordinates for visualization and post-processing of results. A graphical user interface software is implemented in C++ using a QT framework and controls all the individual blocks of the system and implements the necessary image processing, scan calculations, data acquisition, signal processing and result visualization.
목차
등록된 정보가 없습니다.
참고문헌 (21)
참고문헌 신청
Muntazir Abbas / 2018 / Structural Health Monitoring (SHM) and Determination of Surface Defects in Large Metallic Structures using Ultrasonic Guided Waves / Sensors 18(11):3958
Syed H. Abbas / 2018 / High-speed angular-scan pulse-echo ultrasonic propagation imager for in situ non-destructive evaluation / Smart Structures and Systems, An International Journal 22(2):223~230
Connolly, J. W. / 2016 / In Understanding the Magic of the Bicycle / Morgan and Claypool Publishers
Eric B. Flynn / 2013 / Structural imaging through local wavenumber estimation of guided waves / NDT & E International 59:1~10
Hillger, W. / 2014 / Aircoupled ultrasonic testing-method, system and practical applications / Proceedings of the 11th European Conference on Non-Destructive Testing (ECNDT 2014)
Syed H. Abbas / 2018 / High-speed angular-scan pulse-echo ultrasonic propagation imager for in situ non-destructive evaluation / Smart Structures and Systems, An International Journal 22(2):223~230
Connolly, J. W. / 2016 / In Understanding the Magic of the Bicycle / Morgan and Claypool Publishers
Eric B. Flynn / 2013 / Structural imaging through local wavenumber estimation of guided waves / NDT & E International 59:1~10
Hillger, W. / 2014 / Aircoupled ultrasonic testing-method, system and practical applications / Proceedings of the 11th European Conference on Non-Destructive Testing (ECNDT 2014)
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