超高速碰撞产生等离子体的频谱响应特征
Spectral response characteristics of plasma generated by hypervelocity impact
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摘要: 针对探针与接地极板间的阻抗匹配问题，通过对超高速碰撞产生等离子体特征参量诊断系统的理论分析，获得了超高速碰撞产生等离子体的频率组成特征；基于该理论特征建立了一种适用于超高速碰撞产生等离子体的探针测量系统，并利用该探针测量系统进行了LY12实心球形铝弹丸超高速碰撞LY12铝靶实验，得到了该实验中超高速碰撞产生等离子体的功率谱特征。理论分析及实验获得的功率谱结果均表明超高速碰撞产生的等离子体具有低频为主的频谱特征：当频率低于5.8 kHz时，功率谱线比较平滑且幅值较小；频率达到11.0 kHz时，功率谱线的峰值和功率全谱峰值相近。因此频率在5.8~11.0 kHz范围的低频频段对功率谱线的峰值贡献较大，频率超过11.0 kHz时，功率谱线的大幅度抖动对功率谱线的峰值贡献较小。理论及实验结果证明了实验系统的可靠性和实现过程的合理性。Abstract: From the point of impedance matching between the probe and the grounding electrode plate, spectral response characteristics of plasmas generated by hypervelocity impact have been obtained through theoretical analysis of corresponding characteristic parameters diagnostic system. Then a kind of probe measurement system suitable for diagnosing plasma generated by hypervelocity impact was established, and power spectral characteristics were obtained for plasmas generated by solid sphere LY12 aluminum projectile impacting LY12 aluminum target. Theoretical and experimental results show that spectral responses of the plasma generated by hypervelocity impact are mainly in the low frequency range. when the frequency is lower than 5.8 kHz, the power spectrum is smooth with low amplitude; when the fr
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Key words:
- hypervelocity impact /
- plasma /
- probe /
- spectral response characteristic /
- power spectrum
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