原子氧及紫外线对O形圈泄漏率影响的研究

运用地面模拟设备对硅橡胶材料O形圈进行了原子氧暴露、紫外线辐射实验研究；利用测压法进行了O形圈在原子氧暴露及紫外线辐射前后的泄漏率比对实验，并对实验前后O形圈进行了扫描电镜分析。实验表明：原子氧和紫外线辐射对O形圈的表面状况及泄漏率均有明显影响。     

Future Instrumentation for the Study of the Warm-Hot Intergalactic Medium

We briefly review capabilities and requirements for future instrumentation in UV- and X-ray astronomy that can contribute to advancing our understanding of the diffuse, highly ionised intergalactic medium.     

机载曳光弹的紫外产生机理

立足于现有装备的基础上,大力发展经济,可靠,方便的紫外干扰技术,对我军而言不啻是一种我服的有效手段,在原子物理学理论指导下,本文详细地介绍了产生紫外线光谱重要的一环,原子材料紫外光谱的产生方法,文章的末尾还给出了实验的结果。     

Line blanketing by iron group elements in non-LTE model atmospheres of hot stars

We report on our recent progress in modeling non-LTE atmospheres of O-stars including blanketing by lines from the iron group elements. The numerical method to account for the huge number of atomic levels and line transitions is presented. Results of exploratory model calculations examining the effects on the temperature structure, the hydrogen and helium line profiles and UV/EUV fluxes are discussed.     

New flare model using recent measurements of the solar ultraviolet irradiance

The solar photon output from the Sun, which was once thought to be constant, varies considerably over time scales from seconds during solar flares to years due to the solar cycle. This is especially true in the wavelengths shorter than 190 nm. These variations cause significant deviations in the Earth and space environment on similar time scales, which then affects many things including satellite drag, radio communications, atmospheric densities and composition of particular atoms, molecules, and ions of Earth and other planets, as well as the accuracy in the Global Positioning System (GPS). The Flare Irradiance Spectral Model (FISM) is an empirical model that estimates the solar irradiance at wavelengths from 0.1 to 190 nm at 1 nm resolution with a time cadence of 60 s. This is a high enough temporal resolution to model variations due to solar flares, for which few accurate measurements at these wavelengths exist. This model also captures variations on the longer time scales of solar rotation (days) and solar cycle (years). Daily average proxies used are the 0–4 nm irradiance, the Mg II c/w, F10.7, as well as the 1 nm bins centered at 30.5 nm, 121.5 (Lyman Alpha), and 36.5 nm. The GOES 0.1–0.8 nm irradiance is used as the flare proxy. The FISM algorithms are given, and results and comparisons are shown that demonstrate the FISM estimations agree within the stated uncertainties to the various measurements of the solar Vacuum Ultraviolet (VUV) irradiance.     

World Space Observatory-Ultraviolet: ISSIS,the imaging instrument

The Imaging and Slitless Spectroscopy Instrument (ISSIS) will be flown as part of the science instrumentation in the World Space Observatory-Ultraviolet (WSO-UV). ISSIS will be the first UV imager to operate in a high Earth orbit from a 2 m class space telescope. In this contribution, the science driving the ISSIS design and the main characteristics of this instrument are presented.     

紫外成像光谱仪主动热控系统的设计与实现

为了确保紫外临边成像光谱仪的温度水平和温度梯度满足指标要求,分析了其所处空间环境并结合其光机电的特点,设计了整机的主动热控方案和被动热控方案。首先,总结了成像光谱仪热设计的基本原则,介绍了主动热控方案和被动热控方案。接着,利用最坏情况分析法分析了主动热控系统测温电路的测温精度。然后,根据主动热控方案的要求,对主动热控系统的硬件和热控策略进行了设计和实现。最后,规划了主动热控系统的验证试验,并对主动热控系统进行了试验验证。分析和实验结果表明：主动热控系统的测温精度满足≤±0.5℃的指标要求,主动热控系统能够保证紫外临边光谱仪13℃～18℃以及紫外环形成像仪8℃～18℃的温度水平要求,主动热控方案合理、可行,满足高可靠性的要求。     

紫外后向散射探测臭氧总量的反演误差研究

通过探测紫外后向散射获取臭氧总量目前已经成为臭氧总量探测的主要方法之一. 本文以模拟计算为主要方法, 从模式计算误差, 反演算法误差和仪器误差三方面着手, 对影响臭氧总量反演精度的各个参数进行分析研究, 并对由其引起的臭氧总量反演误差进行定量计算, 研究结果对臭氧总量反演精度的提高和实际观测资料的处理有着重要的指导意义.      

基于紫外敏感器的卫星自主导航方法研究

研究了卫星利用CCD紫外敏感器进行自主轨道确定的方法。敏感器通过地球紫外图像提供地心方向矢量及姿态误差信息进而确定卫星轨道。采用Unscented卡尔曼滤波算法,对紫外敏感器测量精度、姿态误差、部分轨道参数以及地球模型对导航精度的影响进行了仿真验证。仿真结果表明本方法具有较高的定轨精度,其导航误差主要取决于紫外敏感器测量精度和卫星姿态误差。     

充气型紫外光敏管降噪研究

充气型紫外光敏管噪声过大是紫外火警探测系统最难克服的问题。本文从器件制造和使用的角度分析了影响紫外光敏管噪声的重要因素,探讨了降噪措施:制造工艺方面,采用高纯度金属镍基阴极材料和保持阴极表面质量良好,充分老化器件,选择高纯度氢气为主充气体并控制充入氦气比例不高于15%;使用方面,降低器件工作电流和工作电压可进一步减小器件噪声。最后采用锁相放大进行噪声测试,在120ms内,测得紫外光敏管噪声电压均值为0.0065V,测试不确定度为7.4%;在无外界紫外照射下,经脉冲计数,测得单位时间内紫外光敏管累积输出噪声脉冲为10cpm,显著降低器件噪声。