航天器环境工程2026，Vol.43Issue(3)：169-176,8.DOI:10.12126/see.2026034
球型电场传感器电路设计及试验研究
Circuit design and experimental study of a spherical electric field sensor
摘要
Abstract
To meet the requirements of electric field detection in low-density,high-impedance plasma environments,a spherical electric field sensor and its associated signal-processing circuitry were investigated.The sensor features a potential reference that can float with the input signal.The V-I characteristics,ideal operating point,and impedance characteristics of the spherical probe were analyzed based on the orbital-motion-limited(OML)theory.A floating power supply was designed for the preamplifier,enabling the probe to measure potentials within±100 V.Meanwhile,a stable bias current over a range of±90 μA was achieved through a linear control scheme applied to the bias current.In ground-based simulation experiments,the V-I curves obtained from probe scanning agreed well with the theoretical model.The derived electron density ranged from 1.64×1010 to 1.92×1010 m-3,while the electron temperature ranged from 0.468 to 0.508 eV,consistent with the preset plasma parameters.When the probes operated stably at the ideal operating point,the average potential difference between the two probes was 0.037 V,which was close to zero.Experimental results show that the dual-probe sensor can achieve potential measurements over a large dynamic range with good inter-probe consistency.The bandwidth reaches 88 kHz,and the equivalent electric field noise is 1.65 mV/m at a 50 m probe separation.These characteristics enable differential measurements of space electric fields.关键词
电场探测/球型电场传感器/等离子体参数反演/地面验证试验Key words
electric field detection/spherical electric field sensor/plasma parameter inversion/ground validation experiment分类
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赵硕,周斌,李磊,程炳钧,翁成翰,赵柏..球型电场传感器电路设计及试验研究[J].航天器环境工程,2026,43(3):169-176,8.基金项目
中意合作研究项目"低轨空间等离子体环境模拟装置关键部件"(编号:Z221100002722006) （编号:Z221100002722006）
