Multiphysics FEA Simulation for Polymer Nanocomposite Laser Ultrasound Transducer

In this study, the acoustic output of candle soot nanoparticles(CSNP)/PDMS laser ultrasound transducer (LUT) was predicted by a multiscale hierarchical simulation method. Firstly, the carbon/PDMS composites' effective properties were estimated by the nanoscale unit model. Secondly, a LUT model was developed in COMSOL by coupling Wave Optics, Heat Transfer, Structural Mechanics and Acoustics modules, and the acoustic output at the LUT surface was predicted using the properties parameters generated by the model in the first step. Lastly, the near-field wave proportion was calculated theoretically. For CSNP/PDMS LUT, our hierarchical model had high accuracy on both time and frequency domain output.