用于空间科学研究的基于磁阻传感器的矢量磁强计

提出一种用于空间科学研究的基于低资源消耗各项异性磁阻传感器的矢量磁强计。该矢量磁强计的探测范围为±65000nT,–3dB带宽为DC～10Hz的磁场波,噪声功率谱密度≤0.2nT/Hz^1/2@1 Hz,非线性误差■,非正交性误差■。该磁强计搭载运行于太阳同步轨道的风云三号气象卫星(FY-3E),在轨初步探测结果表明,该磁强计具备探测空间磁场扰动(例如极光椭圆区的场向电流(20～60 nT))的能力。     

内部充放电监测器仿真及地面实验研究

为了实现对航天器内部充放电效应的有效监测,使用解析方法和有限元分析研究内部充放电监测器(DDCEM)内部电极层连接过孔的参数设计.结果表明,当过孔绝缘区半径与焊盘半径之比大于2时,可以忽略过孔对电子的泄露;最大电位和最大电场强度均位于电极层与过孔焊盘的绝缘区;当顶层电极输入电流达到最大量程时,DDCEM内部最大电场超过...     

木星轨道卫星深层介质充电电势仿真研究

采用GEANT4-RIC方法, 对处于木星轨道的星用电路板FR4 (环氧玻璃布层压板)介质和电缆PTFE (聚四氟乙烯)介质的充电过程进行模拟研究, 计算不同接地状态、不同介质厚度和不同屏蔽层厚度条件下, 介质内部的充电电势。研究结果表明, 介质充电电势与介质接地方式密切相关, 双面接地可以大大降低介质的充电电势; 使用薄介质以及增加屏蔽层厚度也是降低介质内部充电电势的有效方法。     

星内粒子辐射探测器上高压单元的模拟

中巴资源卫星上的星内粒子辐射探测器的探头必须要工作在稳定,高信噪比的直流高压电源下。事实证明,安装在中巴资源－1和中巴资源－2卫星上的探测器高压单元能够保证整个探测器的正常运行。但是,新的实验对高压单元的设计提出了新的要求和新的技术指标,作者根据要求和技术指标对原来的探测器高压单元部分进行了改进。首先简要介绍粒子辐射探测器以及它在空间探测方面的作用,然后介绍探测器高压单元的基本原理,并对其中的振荡－换能部分进行理论分析和数值模拟。通过数值模拟,可以从理论上预言高压单元工作点的稳定性以及输出电压随其他参数波动式的变化。最后,对所做的模拟进行相关的讨论和展望。     

Thermal experiment of silicon PIN detector

The experiment of this paper is the thermal test of the leakage current of silicon PIN detector. Raising temperature may cause the detector to increase leakage current, decrease depletion and increase noise. Three samples are used in the experiment. One (called ΔE) is the sample of 100 μm in thickness. The other two (called E₁ and E₂) are stacks of five detectors of 1000 μm in thickness. All of them are 12 mm in diameter. The experiment has been done for 21 hours and with power on continuously. The samples have undergone more than 60℃ for about one hour. They are not degenerated when back to the room temperature. The depletion rate is temperature and bias voltage related. With the circuit of the experiment and temperature at 35℃, ΔE is still depleted while E₁ and E₂ are 94.9% and 99.7% depleted respectively. The noises of the samples can be derived from the values at room temperature and the thermal dependence of the leakage currents. With the addition of the noise of the pre-amplifier, the noises of E₁, E₂ and ΔE at 24℃ are 16.4, 16.3, and 10.5 keV (FWHM) respectively while at 35℃ are about 33.6, 33.1, and 20.6 keV (FWHM) respectively.     

物理教与学的新见解

社会文化素质是人通过环境和教育在后天形成的。素质教育作为教育的一个重要部分,是指以全面提高我们学生的身体素质、心理素质和社会文化素质为目标的教育。我们国内与国外的教育观却不尽相同。相比较,我们更应该汲取他们的教学模式和经验,再结合我们自身的条件和方法如尝试新模式教学法、加宽知识面和加强科学的方法来培养和提高学生对物理学习的兴趣和效率。     

Geomagnetic responses in high latitudes during the storm of July 15-16, 2000

The ionospheric equivalent currents in the high latitudes and the auroral electrojet system during the geomagnetic storm on July 15-16, 2000 are analyzed by using geomagnetic data from IMAGE chain. The large-scale vortices of equivalent currents are observed in the storm. The vortices on the dusk side of ionosphere correspond to four-celled pattern of plasma convection associated with NBZ, region I and region II field-aligned currents. Only one vortex can be found on the dawn side of ionosphere after interplanetary magnetic field (IMF) turns southward. In the initial phase of the storm, the center of eastward electrojets tends to shift equatorward. It arrives at 58.62o latitude of corrected geomagnetic coordinates (CGM). The westward electrojets are strong in the main phase. The center of westward electrojets in this period moves equatorward and may be beyond the southernmost station (56.45°) of the chain.     

惠斯通电桥式磁阻传感器的零位温度漂移研究

基于惠斯通电桥式磁阻传感器4个电阻元件存在温度差异的事实,提出一个惠斯通电桥式磁阻传感器零位温度漂移的简明准线性模型.在MATLAB环境下,准线性模型的仿真结果与实验结果吻合,验证了准线性模型的有效性,为解释惠斯通电桥型磁阻传感器零位温度漂移的原因提供了清晰的思路,此模型也可应用于其他具有惠斯通电桥结构的传感器.