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18 April 2022 Full field steady-state wavenumber analysis for structural damage detection using dual point laser scanner
Jisoo Choi, Junyoung Jeon, Hyeonwoo Nam, Gyuhae Park, Chan-Yik Park
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Proceedings Volume PC12043, Active and Passive Smart Structures and Integrated Systems XVI; (2022) https://doi.org/10.1117/12.2614141
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States
Abstract
Single frequency standing wave based ultrasonic imaging techniques have the advantage of enabling efficient laser scanning through high signal to noise ratio(SNR) compared to guided wave based ultrasonic imaging techniques. This paper describes a full field steady-state ultrasonic imaging techniques using a dual point laser scanning system. Traditional ultrasonic imaging systems use a mirror tilting device and single point laser doppler vibrometer(LDV) to measured the responses. After obtaining the steady-state responses, several wavenumber based damage detection algorithms are applied to detect structural damage. In this work, we develop a system that utilizes a dual point laser scanner to simultaneously measure the dual points of a structural response to reduce the interrogation time and to make the system applicable to multiple structure. To validate the proposed technique, experiments are conducted on plates with different thickness and defect sizes. The result show that the proposed technique could detect and qualify the various type of damage on the multiple structures with the improved speed.
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Jisoo Choi, Junyoung Jeon, Hyeonwoo Nam, Gyuhae Park, and Chan-Yik Park "Full field steady-state wavenumber analysis for structural damage detection using dual point laser scanner", Proc. SPIE PC12043, Active and Passive Smart Structures and Integrated Systems XVI, (18 April 2022); https://doi.org/10.1117/12.2614141
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KEYWORDS
Laser scanners
Damage detection
Ultrasonography
Imaging systems
Detection and tracking algorithms
Doppler effect
Laser systems engineering
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