We describe the design, construction and characterisation of a broadband passive cavitation detector, with the specific aim of detecting low frequency component periodic shock waves with high sensitivity. A finite element model is used to guide selection of matching and backing layers for the shock wave passive cavitation detector (swPCD), and the performance is evaluated against a commercially available device. Validation of the model, and characterisation of the swPCD is achieved through experimental detection of laser-plasma bubble collapse shock waves. The final swPCD design is 20 dB more sensitive to the subharmonic component, from acoustic cavitation driven at 220 kHz, than the comparable commercial device. This work may be significant for monitoring cavitation in medical applications, where sensitive detection is critical, and higher frequencies are more readily absorbed by tissue.

我们描述了宽带无源空化检测器的设计，构造和特性，其特定目的是以高灵敏度检测低频分量周期性冲击波。有限元模型用于指导选择用于冲击波无源汽蚀检测器（swPCD）的匹配层和衬里，并根据市售设备评估性能。该模型的验证和swPCD的表征是通过实验检测激光等离子体气泡破裂冲击波来实现的。最终的swPCD设计对次谐波分量的敏感度为220 kHz，这比同类的商用设备要高20 dB。对于敏感检测至关重要的医疗应用中的气穴现象，这项工作可能具有重要意义，