Terahertz Reflection Vibrometry for Analyzing Metal Foil Displacement induced by Single Cavitation Bubble Collapse

Cavitation bubbles produced in lower pressure regions, causes erosion and vibration of ship propeller and other hydro-machinery. Therefore, a major interest lies in optimizing and designing hydro-machinery to reduce the caused damage. So far destructive mechanisms on ridged compounds by bubbles are well understood however, structural vibration of elastic nearby structures is still a quest. Therefore, fundamental understanding of the dynamics of cavitation bubbles and resulting structural response of elastic structures e.g. foil must be investigated. In this work, we present a terahertz reflection measurement setup to investigate in the effects of single cavitation expositions on metallic surfaces under water. We compare the measurements with those of a commercially available optical interferometer.