Abstract
This paper studies the actuation and sensing of Lamb waves in thin metal plates, including those made of nuclear grade Zircaloy cladding material and carbon fiber reinforced polymer (CFRP) composite. The non-contact system consists of a pulsed laser (PL) for excitation and scanning laser Doppler vibrometer (SLDV) for sensing. The PL works in the thermoelastic regime to excite Lamb waves and SLDV provides high resolution multidimensional wavefield signals for evaluation. Two experimental setups are explored: excitation and sensing on the same side of the plate and each on opposing sides. Sensing parameters and surface enhancements are explored to obtain high frequency Lamb waves. The results show that the system can produce Lamb waves in higher frequency (<600 kHz) in plates thinner than 1 mm and are effective in thickness measurement.
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