A Visualization Method for Corrosion Damage on Aluminum Plates Using an Nd:YAG Pulsed Laser Scanning System

This paper proposes a non-contact nondestructive evaluation (NDE) technique that uses laser-induced ultrasonic waves to visualize corrosion damage in aluminum alloy plate structures. The non-contact, pulsed-laser ultrasonic measurement system generates ultrasonic waves using a galvanometer-based Q-s...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2016-12, Vol.16 (12), p.2150-2150
Main Authors: Lee, Inbok, Zhang, Aoqi, Lee, Changgil, Park, Seunghee
Format: Article
Language:English
Subjects:
Aluminum
Corrosion
Corrosion effects
Damage
Damage detection
Galvanometers
Laser applications
Lasers
Lead zirconate titanates
Metal plates
Neodymium lasers
non-destructive testing
Nondestructive testing
plate structure
pulsed laser scanning
Pulsed lasers
Scanning
Semiconductor lasers
Sensors
Structural damage
Ultrasonic testing
ultrasonic waves
Wave attenuation
YAG lasers
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Summary:This paper proposes a non-contact nondestructive evaluation (NDE) technique that uses laser-induced ultrasonic waves to visualize corrosion damage in aluminum alloy plate structures. The non-contact, pulsed-laser ultrasonic measurement system generates ultrasonic waves using a galvanometer-based Q-switched Nd:YAG laser and measures the ultrasonic waves using a piezoelectric (PZT) sensor. During scanning, a wavefield can be acquired by changing the excitation location of the laser point and measuring waves using the PZT sensor. The corrosion damage can be detected in the wavefield snapshots using the scattering characteristics of the waves that encounter corrosion. The structural damage is visualized by calculating the logarithmic values of the root mean square (RMS), with a weighting parameter to compensate for the attenuation caused by geometrical spreading and dispersion of the waves. An intact specimen is used to conduct a comparison with corrosion at different depths and sizes in other specimens. Both sides of the plate are scanned with the same scanning area to observe the effect of the location where corrosion has formed. The results show that the damage can be successfully visualized for almost all cases using the RMS-based functions, whether it formed on the front or back side. Also, the system is confirmed to have distinguished corroded areas at different depths.
ISSN:1424-8220
1424-8220
DOI:10.3390/s16122150