Abstract
The spatiotemporal accuracy of passive acoustic mapping (PAM) for monitoring in situ cavitation bubbles has not been assessed directly via optical means. Here, the cavitation bubbles are monitored from two image sequences obtained simultaneously with PAM and high-speed photography (HSP). The temporal accuracy of PAM for detecting cavitation nucleation and the spatial resolution for cavitation localization are compared with those measured from HSP. The results show that PAM has a temporal accuracy of 20 μs. Mean differences in the spatial locations of PAM and HSP are as small as 10.0 and 30.5 μm along the lateral and axial directions, respectively.
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