Hyperspectral imaging and remote trace detection of cis-1,3,4,6-tetranitrooctahydroimidazo-[4,5 d] imidazole (BCHMX) compared with traditional explosives using laser induced fluorescence

cis-1,3,4,6-Tetranitrooctahydroimidazo-[4,5 d] imidazole (BCHMX) is an advanced energetic compound that expected to spread worldwide in the near future. Since, no approved remote detection methods were reported in current literature for this material, we performed hyper-spectral imaging and laser induced fluorescence (LIF) to a BCHMX sample under low laser fluence for determining the optimum laser wavelength used in any future BCHMX-LIF based remote detection systems. For this purpose, an experimental setup consisted of a sun spectrum lamp and hyper-spectral camera was built to illuminate and image white powder samples of BCHMX in comparison with the traditional explosives, HMX (1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane), RDX (1,3,5-trinitro-1,3,5-triazacyclohexane), PETN (2,2-Bis[(nitroxy)methyl]propane-1,3-diyldinitrate). The imaging reveals strong BCHMX sample absorption contrast among other samples at wavelength ranging from 400 to 410 nm. When light source was replaced by a 405 nm laser diode illuminator, a strong BCHMX sample LIF at the spectral range from 425 to 700 nm was observed under low laser fluence condition of 0.1 mJ/cm². Finally, we demonstrated successfully the ability of the 405 nm LIF and the hyperspectral imaging technique to detect finger print traces of BCHMX on white cellulose fabric from a distance of 15 m and a detection limit of 1 μg/cm².     

Damage to aircraft composite structures caused by directed energy system: A literature review

This paper presents a comprehensive review of the research studies on direct energy system effect on aircraft composite structures to develop a good understanding of state-of-the-art research and devel-opment in this area. The review begins with the application of composite materials in the aircraft structures and highlights their particular areas of application and limitations. An overview of directed energy system is given. Some of the commonly used systems in this category are discussed and the working principles of laser energy systems are described. The experimental and numerical studies re-ported regarding the aircraft composite structures subject to the effect of directed energy systems, especially the laser systems are reviewed in detail. In particularly, the general effects of laser systems and the relevant damage mechanisms against the composite structures are reported. The review draws attention to the recent research and findings in this field and is expected to guide engineers/researchers in future theoretical, numerical, and experimental studies.     

卫星激光防护技术

从两方面探讨轨道卫星激光防护技术.介绍卫星光电探测器激光防护设计原理及新型防护技术.对提高卫星结构材料的抗激光损伤能力提出几种实用方法.     

星载激光告警与面目标激光告警组网技术

随着激光武器技术的迅速发展 ,美、俄两国多次进行激光反卫星试验 ,卫星面临的激光威胁已日趋严重 ,进行星载激光告警技术研究势在必行。保护面目标是激光对抗的一道难题 ,目前 ,国外正在研究基于现有激光告警技术 ,并结合软件处理技术的面目标激光告警组网技术。文章对星载激光告警和面目标激光告警组网技术作了分析。     

未来光电精确寻的制导技术发展前景预测

精确自寻的制导系统是精确制导武器中最重要的组成部分。精确寻的制导系统的性能直接影响武器的作战性能、应用范围和成本。分析了未来高技术战争对精确制导武器发展的要求,探索了21世纪光电精确寻的制导技术的发展趋势,分析了新的精确制导体制应具备的发展特点,并对未来的发展提出了建议和意见。     

2002年巡航导弹防御系统发展回顾

以2002年为背景,回顾了美、俄等国在对巡航导弹防御系统研究上所做的工作。通过对已研型号积极进行巡航导弹拦截试验,在研型号想方设法提高其反巡航导弹等能力,积极探索新概念武器提高反巡航导弹的能力,指出通过不断努力和开发,对巡航导弹的防御必将上一个新台阶。     

美国的弹道导弹防御激光武器

主要介绍了美国正在发展的用于弹道导弹防御的机载激光器和太空激光器的基本组成、能力、作战构想、发展计划、进展情况和面临的主要技术挑战     

NO分子A~2Σ←X~2Π跃迁的荧光激发

利用激光光谱技术得到NO分子在 2 1 0～ 2 36nm范围内的荧光发射谱 ,谱线峰值归属于A2 Σ←X2 Π(0 ,0 )、(0 ,1 )跃迁 ,根据谱线峰值位置 ,得到A2 Σ态的基振动频率和平衡位置的力常数。     

美国导弹防御系统的支持技术计划

介绍了美国导弹防御系统支持技术计划中的一些重点项目:助推段拦截计划,先进探测器技术计划和先进拦截弹材料与系统技术计划,通过分析得到了一些有益的启示。     

制导导弹试验仿真中的目标模拟技术

介绍了制导导弹试验仿真中采用的典型目标模拟技术和目前的发展状况,这些目标模拟技术主要包括:信号直接注入技术和目标影像投影技术。详细介绍了几种目标模拟技术的优缺点以及未来的发展趋向。