基于PVDF柔性传感器的不同介质中冲击波 波源测量与频谱分析
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国家重点研发计划项目(2020YFC0122201),国家自然科学基金项目(32071315),中央高校基本科研业务费专项资金(YWF-23-YG-QB-033)


Ballistic Shock Wave Measurement and Spectral Analysis in Different Media Based on Flexible PVDF Sensor
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    摘要:

    目的 明确体外冲击波系统冲击头在不同介质界面产生的冲击波波源特征。方法 采用冲击气压可调的体外冲击波产生与信号采集实验系统,结合聚偏二氟乙烯(PVDF)柔性传感器,通过实验测量方法研究冲击头在不同介质(仿体组织、水和空气)界面产生的冲击波形,分析波源的时域特征和频谱特性。结果 在相同气压冲击下,冲击头在仿体界面和水界面产生的冲击波波形相似,二者与空气界面产生的冲击波波形存在较大差异,空气界面的正负压绝对值明显减小;不同介质中产生的冲击波频谱特性相似,都存在3个明显的峰值频率,仿体、水和空气中调制频率分别为12.2、8.5、7.2 kHz,载波频率基本无变化(82~83 kHz)。不同气压冲击下,冲击头在同一介质界面产生的冲击脉冲波波形差异不大,冲击气压仅影响冲击波幅度,不影响峰值频率。随着冲击气压的增大,介质界面正负压绝对值增大,变化基本呈线性。结论 PVDF柔性传感器可以有效测量冲击波波源,不同介质界面产生的冲击波在时域和频域都存在一定差异,不能简单以空气或水中的冲击波传播特性代替生物组织中的传播特性。研究结果可以为冲击波设备的评估和临床冲击波治疗方案的制定提供重要信息。

    Abstract:

    Objective To clarify the characteristics of shock wave sources generated at different medium interfaces. Methods The experiment used an in vitro adjustable impact pressure shock wave generation and signal acquisition system combined with a flexible PVDF sensor. The waveform of the shock wave generated by the applicator at the interface of different media (soft tissue-mimicking phantom, water and air) was explored. The characteristics of the shock wave source in the time and frequency domains were analyzed. Results When the same impact pressure was applied, shock waveforms generated at the interfaces of the phantom and water exhibited similar characteristics from a time-domain perspective. At the same time, both differed significantly from those generated at the air interface, where the absolute values of the positive and negative pressures were noticeably reduced. The characteristics of the shockwave spectra in various media revealed three distinct peak frequencies, with the modulation frequencies varying in the phantom (12.2 kHz), water (8.5 kHz), and air (7.2 kHz). In contrast, the carrier frequency remained relatively constant (between 82 and 83 kHz). When different impact pressures were applied, there was little influence on the waveform at the same medium interface, indicating that the impact pressure affected only the shockwave amplitude and not the peak frequency. As the impact pressure increases, the absolute values of the positive and negative pressures at the medium interface increase linearly. Conclusions Shockwave sources can be effectively measured using a flexible PVDF sensor. Shock waves generated at different medium interfaces exhibit temporal and spectral differences, indicating that the characteristics of shock wave propagation in air or water cannot be substituted for those in biological soft tissues. These findings provide crucial information for evaluating shockwave devices and formulating treatment protocols in the clinic.

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牛海军,徐连胜,沈飞,吴琼,王立,李沣骥,樊璠.基于PVDF柔性传感器的不同介质中冲击波 波源测量与频谱分析[J].医用生物力学,2024,39(2):319-325

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  • 收稿日期:2023-08-02
  • 最后修改日期:2023-09-06
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  • 在线发布日期: 2024-04-26
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