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Study on the advanced electric field measurement system in space plasmas

先进空间等离子体电场测量系统研究

基本信息

批准号：
15340163
负责人：
KOJIMA Hirotsugu
金额：
$ 10.24万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

1.Development of the low noise preamplifier : Since we need to detect plasma waves with very low signal levels in the order of a few nV/m/sqrt(Hz), the development of the very low noise preamplifier is important. Especially, in the next generation, we have a plan to observe the thermal fluctuation signals of the vicinity plasmas in order to know the local plasma parameters such as densities and temperatures. We succeeded in developing the very low noise preamplifier with the wide frequency range up to 10MHz.2.Light-weight carbon fiber antenna : The carbon fiber antenna is the most plausible electric field antenna in the next mission as the electric field sensor extending to the spin axis direction. Since it is made of winding carbon fibers, we worried about the effect of the inductance in the high frequency range. We conducted the field tests for the carbon fiber antennas and confirmed the efficiency is high enough to be used in the space mission.3.Design of the onboard antenna impedance measurement system : We designed the sophisticated onboard measurement system of electric field sensors based on the coherent detection method. It realizes the measurement of antenna impedance with good S/N ratio.4.Computer experiments on antenna impedance : We developed 3-dimensional simulation program which can handle the realistic spacecraft shape and antennas under realistic plasma conditions such as densities and temperatures. It also has the capability to treat the dynamics of photo electrons. We investigated the effects of the vicinity plasma conditions to the antenna impedance.5.Advance and light weight electric field receiver : We attempted to integrate the analog parts of the typical plasma wave receiver system into one-chip device by using the ASIC technology. The developed chip was tested inside the electromagnetic shield chamber and confirmed its functions.

1.低噪声探测器的开发：由于我们需要检测信号电平非常低的等离子体波，信号电平大约为几nV/m/sqrt（Hz），因此非常低噪声探测器的开发非常重要。特别是，在下一代，我们有一个计划，观察附近的等离子体的热涨落信号，以了解局部等离子体参数，如密度和温度。2.轻质碳纤维天线：碳纤维天线作为电场传感器延伸到自旋轴方向，是下一次使命中最有可能的电场天线。由于它是由缠绕碳纤维制成的，我们担心在高频范围内电感的影响。对碳纤维天线进行了外场测试，测试结果表明，碳纤维天线具有较高的工作效率，可以应用于空间任务。3.天线阻抗测量系统的设计：设计了基于相干检测方法的电场传感器星载测量系统。4.天线阻抗的计算机仿真实验：我们开发了三维仿真程序，可以在真实的等离子体条件下（如密度和温度）处理真实的航天器形状和天线。它还具有处理光电子动力学的能力。研究了等离子体环境对天线阻抗的影响。5.先进、轻量化的电场接收机：尝试采用ASIC技术将典型等离子体波接收机系统的模拟部分集成到单片器件中。研制的芯片在电磁屏蔽室内进行了测试，验证了其功能。