The effects of voltage and current pulse durations of underwater discharge on shock wave generation are reported. In this article, underwater discharges were generated by using a magnetic pulse compression (MPC) circuit. The compression number of the MPC circuit was varied from two compressions to one and no compression; also the capacitance of an output peaking capacitor connected in parallel to discharge electrodes (load) was varied from 10 to 6 and 2 nF. As a result, electric pulses with different rise time/duration and variable peak voltages and currents were obtained and applied to generate shock waves. The shock waves were quantitatively measured with optical principles using a fiber optic probe hydrophone (FOPH) pressure transducer. By reflecting the generated shock waves from a reflector, uniform shock waves were produced, which made it possible to accurately measure the shock waves. The maximum pressure of the generated shock wave after the reflection was in the range of 40 MPa. The energies of the output shock waves were calculated from the pressure histories and the electrical to shock wave energy conversion efficiency was calculated from the electrical energy used to generate the shock waves. The results indicated that the rise time of voltage and current significantly affects the electrical energy that can be delivered to generate the shock waves. For the range of the electric pulse durations of 100 to 500 ns of this article, the shock waves pressures were independent of the pulse duration for the same input energy consumed during the rise and full width at half maximum times of the current. The method presented here gives possibility to select the shock wave profile, which would be crucial for successful medial applications.

中文翻译：

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电压和电流波形对医疗应用中向水下冲击波的脉冲放电能量转移的影响

报告了水下放电的电压和电流脉冲持续时间对冲击波产生的影响。在本文中，水下放电是通过使用磁脉冲压缩 (MPC) 电路产生的。MPC电路的压缩次数从两次压缩变为一次压缩和不压缩；与放电电极（负载）并联的输出峰值电容器的电容也在 10 到 6 nF 和 2 nF 之间变化。结果，获得并施加具有不同上升时间/持续时间和可变峰值电压和电流的电脉冲以产生冲击波。使用光纤探头水听器 (FOPH) 压力传感器，利用光学原理对冲击波进​​行定量测量。通过反射器反射产生的冲击波，产生均匀的冲击波，这使得准确测量冲击波成为可能。反射后产生的冲击波的最大压力在40 MPa范围内。根据压力历史计算输出冲击波的能量，并根据用于产生冲击波的电能计算电到冲击波的能量转换效率。结果表明，电压和电流的上升时间显着影响可传递以产生冲击波的电能。对于本文的 100 到 500 ns 的电脉冲持续时间范围，对于相同的输入能量在电流的上升和半峰全宽期间消耗的脉冲持续时间，冲击波压力与脉冲持续时间无关。