共查询到20条相似文献,搜索用时 109 毫秒
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激光诱导等离子体光谱技术应用于月球探测的可行性研究 总被引:2,自引:0,他引:2
阐述了激光诱导等离子体光谱技术的物理机制,分析了气压影响激光诱导等离子体光谱探测的机制和规律,建立了低气压环境下进行激光诱导等离子体光谱探测的试验装置,开展了不同等级低气压环境下的试验研究,通过试验数据具体量化了气压对激光诱导等离子体光谱探测的影响,进而论证了激光诱导等离子体光谱技术应用于月球探测的可行性. 相似文献
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微弱光谱信号的探测与识别 总被引:3,自引:1,他引:2
讨论了红外遥感中对微弱光谱信号的检测问题,利用该方法,能在远距离处对目标云团进行有效的探测和识别,本文对探测原理和信号处理等问题作了较为详细的论述。 相似文献
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拉曼光谱是一种分子指纹光谱,在物质成分识别和定量分析领域已得到广泛应用,近年来也逐渐应用于深海极端环境
的原位探测。回顾了激光拉曼光谱技术的发展历程,介绍了国内外已经研发的深海激光拉曼光谱探测系统,并着重介绍
了各系统在深海冷泉、热液等极端区域对喷口流体、沉积物孔隙水、自生碳酸盐岩、水合物等目标物的原位探测和
应用,最后总结了限制拉曼光谱技术在深海取得更多应用的因素,可以为拉曼光谱技术未来的发展提供参考。 相似文献
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探测月球与行星表面物质化学成分是了解其起源及演化历史的关键,而光谱探测技术则是物质成分识别与定量反演研究的重要手段。原位(In-Situ)光谱探测有别于空间探测中的环绕器遥感及采样返回探测,是指在目标现场进行的近距离光谱探测。我国“嫦娥三号”任务科学研究与资源勘查,需要开展月球表面原位光谱探测技术研究,突破凝视型时序扫描的新型声光光谱探测关键技术,研发适应表面恶劣环境的高性能、轻小型、高可靠仪器,在国际上率先实现月球表面光谱原位探测及分析。论文结合以“嫦娥三号、四号”为典型应用的红外成像光谱仪,介绍据此发展起来的月球表面原位光谱探测技术,包括探测机制、工作模式及仪器的功能、性能与应用;最后,也简要介绍了即将应用的“嫦娥五号”月球矿物光谱分析仪。 相似文献
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Baker C. Lo T. Tribe W.R. Cole B.E. Hogbin M.R. Kemp M.C. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2007,95(8):1559-1565
Terahertz imaging and spectroscopy has been shown to have the potential to use very low levels of nonionizing radiation to detect and identify objects hidden under clothing. In this paper we discuss some of the important factors involved in addressing practical systems in the security industry, and describe our recent work on the development of a prototype terahertz standoff detection system. Using this system we demonstrate the spectroscopic detection of concealed explosives at a standoff distance of 1 m, both real time, in reflection, and under normal atmospheric conditions. 相似文献
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为了实现对液体的无损探测识别,在可调谐二极管激光吸收光谱和波长调制光谱(TDLAS-WMS)技术的基础上,采用嵌入式处理器LPC2148和波长可调谐的分布反馈(DFB)激光器设计并研制了液体无损探测识别电子鼻系统,控制DFB激光器出射波长通过被检测液体的挥发气体,根据谱带的吸收情况进行探测,并将数据经过USB接口传输到上位机进行处理和分析。上位机根据气体信息数据库识别出被检测液体。测试结果表明,设计的电子鼻系统可以在不破坏待测物质化学性质的前提下快速准确地进行探测和区分识别。 相似文献
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Imaging for concealed weapon detection: a tutorial overview of development in imaging sensors and processing 总被引:1,自引:0,他引:1
Hua-Mei Chen Seungsin Lee Rao R.M. Slamani M.-A. Varshney P.K. 《Signal Processing Magazine, IEEE》2005,22(2):52-61
Manual screening procedures for detecting concealed weapons such as handguns, knives, and explosives are common in controlled access settings like airports, entrances to sensitive buildings, and public events. The detection of weapons concealed underneath a person's clothing is an important obstacle to the improvement of the security of the general public as well as the safety of public assets like airports and buildings. It is desirable to be able to detect concealed weapons from a standoff distance, especially when it is impossible to arrange the flow of people through a controlled procedure. The goal is the eventual deployment of automatic detection and recognition of concealed weapons. It is a technological challenge that requires innovative solutions in sensor technologies and image processing. A number of sensors based on different phenomenology as well as image processing support are being developed to observe objects underneath people's clothing. The main aim of this article is to provide a tutorial overview of these developments. 相似文献
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有源RLC电路的量子化 总被引:23,自引:11,他引:23
本文提出了RLC电路的一种量子化方案,研究了电路中电荷和电流在几种量子态中的量子涨落。通过变量替换,这种量子化方案也适用于受迫阻尼谐振子。 相似文献
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基于太赫兹光谱技术的爆炸物类危险品检测 总被引:1,自引:1,他引:1
卢树华 《激光与光电子学进展》2012,(4):45-51
太赫兹(THz)光谱技术识别爆炸物类危险品是一种极具竞争力的新型安检方法。总结了不同研究机构的爆炸物指纹谱数据,建立了可供参考的数据库;讨论了棉布、塑料、皮革、涤纶和硬纸板等常见材料覆盖下隐蔽爆炸物的检测状况;介绍了远距离探测爆炸物的最新研究进展。最后,分析了实战场景中应用THz光谱技术检测爆炸物需要面临的混合爆炸物、复杂环境条件和远距离探测等主要问题,并对未来的发展趋势作了展望。 相似文献
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甲烷气体是一种对人体和环境有严重危害的气体,特别在煤矿、天然气罐、气站和石油化工等安全生产领域,对甲烷气体的泄漏监测至关重要。利用可调谐半导体激光吸收光谱技术(TDLAS),选择1 653.72 nm波长作为甲烷气体直接吸收检测的中心波长,使用微透镜设计了14 cm光程吸收池建立了一套浓度范围为0~100%全量程甲烷在线监测系统,利用分束器分成多路对不同位置进行监测,通过小波变换对吸收信号进行降噪处理,提高信噪比,使系统的最低测量极限达到335 ppm (1 ppm=10-6),并将自行研制的多点全量程激光甲烷传感器与商用红外甲烷气体探测器进行对比实验,结果表明:该系统具有测量稳定性好、测量范围大、响应速度快、免调校、测量探头本征安全、低成本等优点,完全有能力满足各行业的使用需求。 相似文献
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A novel electrospun fluorescent nanofiberous membrane with a function like “molecular wires” was developed via electrospinning for the detection of ultra‐trace nitro explosive vapors and buried explosives by naked eye under UV excitation. The high binding affinity between the electron‐deficient nitro explosives and the sensing film results in a rapid, dramatic quenching in its fluorescence emission. A wide spectrum of nitro explosives, in particular, TNT, Tetryl, RDX, PETN and HMX could be “visually” detected at their sub‐equilibrium vapors (less than 10 ppb, 74 ppt, 5 ppt, 7 ppt and 0.1 ppt, respectively) released from 1 ng explosives residues. Such outstanding sensing performance could be attributed to the proposed “sandwich‐like” conformation between pyrene and phenyl pendants of PS which may allow efficient long‐range energy migration similar to “molecular wire”, thus achieving amplified fluorescence quenching. Its application for the detection of buried explosives in soil by naked eye was also demonstrated, indicating its potential application for landmine mapping. To the best of our knowledge, this is the first report about the detection of buried explosives without the use of any advanced analytical instrumentation. 相似文献