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太赫兹时域光谱技术在危险品检测方面的应用 总被引:2,自引:0,他引:2
太赫兹波(terahertz,THz,T-ray)是指频率介于0.1~10 THz之间的电磁辐射,在电磁波谱上位于微波和远红外线之间。大多数爆炸物、毒品在此波段有特征吸收。与在公共安全领域检测武器、爆炸物、毒品等危险品的传统方法相比,太赫兹辐射能量低,不会产生电离辐射,也不会引起安全担忧。而且,太赫兹波对于衣物等大多数包装材料有很强的穿透力,对物质的检测可以做到高灵敏、无损伤和远距离,因此在反恐、毒品、安全检测等方面具有显著潜在优势。文章介绍了国内外太赫兹时域光谱技术(terahertz timedomain spectroscopy,THz-TDS)在爆炸物及毒品检测方面的研究最新进展;详细讨论了黑索金(RDX)的研究现状,并初步探讨了影响实验结果的几种因素。 相似文献
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For the purpose of producing high intensity, multiply charged metal ion beams, the dual hollow cathode ion source for metal ions (DUHOCAMIS) was derived from the hot cathode Penning ion source combined with the hollow cathode sputtering experiments in 2007. To investigate the behavior of this discharge geometry in a stronger magnetic bottle-shaped field, a new test bench for DUHOCAMIS with a high magnetic bottle-shaped field up to 0.6 T has been set up at the Peking University. The experiments with magnetic fields from 0.13 T to 0.52 T have indicated that the discharge behavior is very sensitive to the magnetic flux densities. The slope of discharge curves in a very wide range can be controlled by changing the magnetic field as well as regulated by adjusting the cathode heating power; the production of metallic ions would be much greater than gas ions with the increased magnetic flux density; and the magnetic field has a much higher influence on the DHCD mode than on the PIG mode. 相似文献
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HIRFL-CSR实验环高频同轴谐振腔设计原理 总被引:1,自引:0,他引:1
介绍了同步加速器高频铁氧体加载腔体的设计原理和设计计算过程。 详细说明了腔体加载铁氧体材料的作用和意义, 并对传统的传输线理论计算结果、 CST(Computer Simulation Technology)软件模拟计算结果和实际腔体测量结果进行了比较。 In this paper, the principle and the process of design and calculation based on RF ferrite loaded coaxial cavity in synchrotron are presented. The function and significance of cavity loaded by ferrite are elaborated in detail. Then the calculated results by traditional transmission line theory, software simulated results by Computer Simulation Technology(CST ) and the actual cavity measured results are compared. 相似文献
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The axial emitted bremsstrahlung spectra were measured on SECRAL(Superconducting ECR ion source with Advanced design in Lanzhou)using an HPGe detector.The spectral temperature T_(spe) was obtained from the linear fit of the spectra in the semi-log present.The evolution of T_(spe) with microwave power and magnetic field configuration is investigated in this paper. 相似文献