使用压电火花点火器产生的宽带冲击波的空气耦合超声
Air-coupled ultrasound using broadband shock waves from piezoelectric spark igniters
AI总结：
本研究利用光机传感器探测压电火花点火器产生的宽带冲击波超声，实现了无需对准的固体板高信噪比表征，并估算了近场压力，对空气耦合超声无损检测有潜在价值。
摘要：
我们使用了一种光机传感器来研究由手动操作的压电火花点火器产生的超声。这些低能量火花产生短时声冲击波脉冲，其亚微秒上升时间和频率含量在空气中远超2 MHz。随后，我们使用相同的源-接收器组合，在简单设置中演示了固体（聚合物和玻璃）板的宽带表征，其中单次火花事件无需关键对准即可获得高信噪比数据。该设置还使我们能够估算在距火花毫米级距离处接近105 Pa的压力波动。这些结果在很大程度上得益于光机传感器的小尺寸、宽带宽和高灵敏度，并可能对无损检测中的空气耦合超声应用具有意义。
英文摘要：
We used an optomechanical sensor to study the ultrasound generated by manually operated piezoelectric spark igniters. These low-energy sparks produce short-duration acoustic shock-wave pulses, with sub-microsecond rise times and frequency content extending well beyond 2 MHz in air. The same source-receiver combination was then used to demonstrate broadband characterization of solid (polymer and glass) plates in a simple setup, where single spark events yielded high-SNR data without the need for critical alignment. This setup also enabled us to estimate pressure excursions approaching 105 Pa at millimeter-scale distances from the spark. The results are in large part made possible by the small size, wide bandwidth, and high sensitivity of the optomechanical sensor, and might be of interest for air-coupled ultrasound applications in non-destructive testing.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
