• 空间尘埃电荷探测及地面测试技术研究

    Research on Space Dust Charge Detection and Ground Test Technology

    • 针对空间尘埃在轨探测对大视场、低功耗和高灵敏电荷探测器的需求,设计开发了一种基于非接触电荷感应原理的尘埃电荷探测器,采用金属筛网作为感应电极,配合高增益电荷灵敏放大器,利用绝缘支撑结构和屏蔽筛网抑制噪声。基于空间环境地面模拟装置的高速粉尘加速器,建立了从电子学基础测试、整机模拟诱导电荷到地面高速粉尘模拟环境标定的全流程测试标定方法。利用高速粉尘加速器对150颗Fe粉尘(粒径10 nm~1 μm,速度最高9 km/s)进行测量结果标定,设计的探测器输出电压与粉尘电荷在1~100 fC范围内呈现良好线性关系,计算测量误差在±5%以内。该探测器及标定方法为未来深空尘埃原位电荷测量与联合探测触发提供了可行的技术方案。

       

      Abstract: To meet the requirements of a large field of view, low power consumption and high-sensitivity charge detector for on-orbit detection of space dust, this paper designs and develops a dust charge detector based on the principle of non-contact charge induction. The detector adopts a metal mesh as the induction electrode with a large effective detection area to ensure a wide field of view, is matched with a high-gain charge-sensitive amplifier to improve detection sensitivity, and uses an insulating support structure and a shielding mesh to effectively suppress electromagnetic interference and background noise, ensuring stable operation in complex space environments. Based on the hypervelocity dust accelerator of the space environment simulation research infrastructure (SESRI), a full-process test and calibration method is established, covering basic electronic testing, simulated induced charge measurement of the whole detector, and calibration in the ground-based high-speed dust simulation environment to verify the detector’s performance comprehensively. A total of 150 Fe dust particles (with particle sizes ranging from 10 nm to 1 μm and a maximum velocity of 9 km/s) are measured and calibrated using the hypervelocity dust accelerator. The results show that the output voltage of the designed detector has a good linear relationship with the dust charge in the range of 1~100 fC, and the calculated measurement error is within ±5%. The detector and its calibration method provide a feasible technical solution for in-situ charge measurement and joint detection triggering of deep space dust in the future, laying a solid foundation for subsequent on-orbit detection missions.

       

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