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Rheometry experiment for a wire antenna aboard spacecraft at low frequencies

机译:航天器上低频线天线的流变学实验

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摘要

For observation of plasma waves by a scientific spacecraft, we usually use wire dipole antennas for AC electric field and dipole probes for DC field measurement. An accurate value of effective length of the antenna (h{sub}(eff)) is required to calculate absolute intensities of the electric fields from the output voltage of the antennas, and it is known as L/2 for wire dipole antennas and L for dipole probes. In this paper, we try to clarify the transition of h{sub}(eff) from L to L/2 with frequency. At first, we report the result of a "rheometry experiment" which measures the frequency dependence of h{sub}(eff), and then a theoretical analysis by using its equivalent circuits. The result shows that a wire dipole antenna works as a LONG dipole voltage probe.
机译:为了通过科学的航天器观察等离子体波,我们通常使用线偶极天线来测量交流电场,并使用偶极子探针来测量直流场。需要一个天线有效长度的准确值(h {sub}(eff)),才能根据天线的输出电压计算出电场的绝对强度,对于线偶极天线,它的已知值为L / 2,而对于天线用于偶极探头。在本文中,我们尝试阐明h {sub}(eff)从L到L / 2随频​​率的跃迁。首先,我们报告“流变实验”的结果,该实验测量h {sub}(eff)的频率依赖性,然后通过使用其等效电路进行理论分析。结果表明,线偶极天线用作长双极电压探头。

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