Attenuation of laser generated SAWs in heated PMM A material

摘要

To investigate the propagation of Surface Acoustic Waves (SAWs) in the heated region of Polymethyl Methacrylate (PMMA), through the thermoelastic mechanism, a finite element model is put forward to simulate laser inducing SAWs in PMMA. Meanwhile, the propagation of SAWs through the heated region of PMMA is investigated experimentally: a Nd:YAG laser is used to excite SAWs and a polyvinylindene fluoride (PVDF) transducer is used to detect SAWs. The simulation and experimental results are in good agreement. SAWs have a significant attenuation when they propagate through the heated region of PMMA.