Lamb wave defect detection and evaluation using a fully non-contact laser system

Zhaoyun Ma; Lingyu Yu

doi:10.1117/12.2514048

1 April 2019 Lamb wave defect detection and evaluation using a fully non-contact laser system

Zhaoyun Ma, Lingyu Yu

Proceedings Volume 10972, Health Monitoring of Structural and Biological Systems XIII; 1097221 (2019) https://doi.org/10.1117/12.2514048
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

Traditional Lamb wave structural health monitoring (SHM)/nondestructive evaluation (NDE) system employs contact type transducers such as PZT, ultrasonic transducers, and optical fibers. In application, transducer attachment and maintenance can be time and labor consuming. In addition, the use of couplant and adhesives can introduce additional materials on structures, and the interface coupling is often not well understood. To overcome these limitations, we proposed a fully non-contact NDE system by employing pulsed laser (PL) for Lamb wave actuation and scanning laser Doppler vibrometer (SLDV) for Lamb wave sensing. The proposed system is implemented on aluminum plates. The PL Lamb wave excitation is calibrated, and the optimal parameters are obtained. Lamb wave modes are then characterized through 1D wavefield analysis. With the calibrated and characterized system, defect detection and evaluation are achieved on aluminum plates with simulated defects (surfaced-bonded quartz rod, and machine milled crack) through 1D and 2D inspection in both time-space and frequency-wavenumber domains.

Conference Presentation

Citation Download Citation

Zhaoyun Ma and Lingyu Yu "Lamb wave defect detection and evaluation using a fully non-contact laser system", Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 1097221 (1 April 2019); https://doi.org/10.1117/12.2514048

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