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在理论分析的基础上,研制了基于非接触测量条件下等离子体参数诊断的Ka波段透射测量系统。利用已知介电参数的泡沫介质棒验证了Ka波段透射测量系统的可靠性与测量精度,测试结果表明:在静态测量条件下该系统的测量误差小于1.5%。Ka波段透射测量系统应用于激波管等离子体参数诊断,获得了电子密度和碰撞频率的瞬态变化曲线。在相同实验条件下,Ka波段透射测量系统的等离子体电子密度诊断结果与朗谬尔静电双探针的测量结果较为吻合,表明该系统应用于动态等离子体诊断的结果可信,满足非接触测量条件下瞬态等离子体诊断要求。应用误差理论分析了Ka波段透射测量系统的测量误差,结果表明其相对误差小于10%。
On the basis of theoretical analysis, a Ka-band transmission measurement system based on plasma parameter diagnosis under non-contact measurement conditions was developed. The reliability and measurement accuracy of the Ka-band transmission measurement system were verified by using foam medium rods with known dielectric parameters. The test results show that the measurement error of the system is less than 1.5% under static measurement conditions. The Ka-band transmission measurement system is applied to diagnose the parameters of shock tube plasma, and the transient curves of electron density and collision frequency are obtained. Under the same experimental conditions, the results of the plasma electron density measurement of the Ka-band transmission measurement system are in good agreement with those of the Langmuir electrostatic double probe, indicating that the system is reliable for dynamic plasma diagnosis and meets the requirements of non-contact measurement Transient Plasma Diagnostic Requirements Under Conditions. The measurement error of Ka-band transmission measurement system is analyzed by error theory. The results show that the relative error is less than 10%.