氙气质量流量计校准装置测量不确定度评定

通过建立氙气质量流量计校准的测量模型,分析了测量不确定度分量,最后合成了氙气质量流量计校准装置的相对合成标准不确定度,并对评定结果进行了分析讨论。     

压电比例阀调节的氙气微推进系统流量特性仿真研究

基于压电比例阀驱动的氙气微推进系统是目前国际的发展趋势。压电比例阀作为该类型推进系统的核心组件,其性能将直接影响系统流量特性和推力。本文首先采用AMESim软件对某型氙气工作压力为0.3MPa的压电驱动氙气微推进系统进行建模,并对系统填充过程中的气瓶与减压阀工作特性进行分析。然后研究了不同减压阀反馈腔压力条件下的减压阀与压电比例阀的阀芯运动和氙气质量流量特性。最后,分析了压电比例阀驱动电压对开机过程中的压电比例阀阀针位移、氙气质量流量特性的影响规律。结果显示,压电比例阀阀针在通电后迅速开启,其最终的稳定升程为3.7μm。系统的氙气质量流量的稳定值为5.63mg/s。减压阀反馈腔内的氙气压力越大,压电比例阀开启后的氙气质量流量稳定值越大且响应时间越长。仿真结果表明,本次研究的氙气微推进系统可以通过改变驱动电压实现对氙气质量流量的线性调节,系统氙气质量流量可在较短时间内达到目标值。     

面向空间电推力器的氙气供给系统发展综述及展望

在阐述氙气供给系统组成与分类基础上,将传统氙气供给系统和先进氙气供给系统按照机械减压型、开关控制型和比例控制型三种类型进行梳理,提炼了氙气供给系统中涉及到的关键技术,如建模与仿真技术、流体控制部件技术及系统集成技术,并对其研究现状进行了概述。对氙气供给系统的发展现状和发展趋势进行了总结,重点对国内外氙气供给技术的差距进行分析,给出了我国电推进氙气供给系统的发展建议。首次全面、系统地对面向空间电推力器的氙气供给系统进行综述、总结和展望,对于氙气供给技术的研究具有重要的参考价值。     

KFTA太阳模拟器灯单元的方案设计

在进行KFTA太阳模拟器的设计中,首次采用了氙灯水平点燃的灯单元设计方案。氙灯水平点燃既可以提高太阳模拟器的能量利用率,又降低了成本,节省了人力、物力,但同样也面临着许多新的问题：灯的选择、灯的稳弧、灯的水平调节机构以及灯的应力分析等。文章正是从以上各个方面阐述了KFTA太阳模拟器灯单元的设计思想及方法。     

The N4,5 - OO Auger and “N3” N4,5O2,3 Coster-Kronig spectra of xenon induced by electron impact

The N_4,5OO Auger electron spectrum in the kinetic energy region (14–37) eV has been measured with high resolution at electron incident energies between 71 eV and 2019 eV. The Auger and satellite lines are assigned by comparison with previous literature data. Several states which correspond to the resonant Auger transitions from the 4d_{3/2, 5/2} 6p states are observed. The PCI effects on the N₅-O_2,3O_2,3(¹S₀) Auger peak when the incident electron energy approaches to the N₅ edge (67.55 eV) is investigated and it is found that the dependence of the energy shift on the excess energy, E_exc, is well represented by the function E_exc^β with β = (-1.40 ± 0.05). The ^“N₃^” N_4,5O_2,3 Coster-Kronig spectrum is measured at various electron incident energies. The assignments of the features are made in comparison with a similar spectrum from synchrotron radiation measured by Kivimäki et al. [J. Electron Spectrosc. Relat. Phenom. 1999, 101–103, 43–47]. The Auger spectrum in the kinetic energy regions (68–78) eV and (90–138) eV is observed for the first time in an electron impact experiment and a comparison is made with the photoionization experiment by Hikosaka et al. [Phys. Rev. A 2007, 76, 032708].