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A computer simulation system of three-dimensional sensing with structured illumination is presented. It includes the generation of deformed fringe patterns from 3-D shapes and the reconstruction of 3-D shapes, conversely. Some experimental results of the deformed fringe pattern and the reconstructed object shapes are presented. We have also discussed the effect of some major system parameters on the measurement results and considered how to correct these parameters according to the measurement result of the standard plane. Using this simulation system, the major system parameters: environmental conditions, measurement accuracy and algorithm evaluation of the 3-D shape measurement system based on PMP, FTP, SPM, etc., can be researched. © 1997 Elsevier Science Ltd. All rights reserved. 相似文献
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分别叙述了太阳能在荧光灯、HID灯、LED灯照明系统中的应用。为提高太阳能光伏照明系统的可靠性,介绍了太阳能光伏照明风光互补系统和太阳能光伏照明光电互补系统。并提出太阳能光伏照明系统中应注意的技术问题。 相似文献
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Gandham Lakshminarayana 《Journal of solid state chemistry》2011,184(8):1931-1938
We report on Tb3+ as efficient sensitizer for red photoemission from Mn2+-centers in ZnO-B2O3-Al2O3-Si2O-Na2O-SrO glasses and corresponding gahnite glass ceramics. In comparison to singly or co-doped glasses, the glass ceramics exhibit significantly increased emission intensity. Structural considerations, ESR, and dynamic luminescence spectroscopy indicate partial incorporation of Mn2+ as well as Tb3+ into the crystalline phase, the former on octahedral Zn2+-sites. Interionic distance and charge transfer probability between both species depend on crystallization conditions. This enables control of the energy transfer process and, hence, tunability of the color of photoemission by simultaneous emission from Tb3+ and Mn2+ centers. Concentration quenching in Mn2+-singly doped materials was found at a critical dopant concentration of about 1.0 mol%. The energy transfer process was studied in detail by dynamic as well as static luminescence spectroscopy. Spectroscopic results suggest the application of the studied materials as single or dual-mode emitting phosphor for luminescent lighting. 相似文献
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M.L. Dubernet V. Boudon M.S. Dimitrijevic C. Joblin G. Leto P.A. Loboda N.J. Mason G. Mulas L.A. Nuñez N. Piskunov G. Rixon E. Roueff A. Ryabtsev B. Schmitt J. Tennyson N.A. Walton C.J. Zeippen 《Journal of Quantitative Spectroscopy & Radiative Transfer》2010,111(15):2151-2159
The Virtual Atomic and Molecular Data Centre (VAMDC, http://www.vamdc.eu) is a European Union funded collaboration between groups involved in the generation, evaluation, and use of atomic and molecular data. VAMDC aims to build a secure, documented, flexible and interoperable e-science environment-based interface to existing atomic and molecular data. The project will cover establishing the core consortium, the development and deployment of the infrastructure and the development of interfaces to the existing atomic and molecular databases. It will also provide a forum for training potential users and dissemination of expertise worldwide. This review describes the scope of the VAMDC project; it provides a survey of the atomic and molecular data sets that will be included plus a discussion of how they will be integrated. Some applications of these data are also discussed. 相似文献
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随着全固态中波广播发射机的大量应用,其防雷问题也愈加凸显出它的重要性。本文根据河南省许昌中波转播台发射系统的防雷现状,分析研究我台防雷工作中存在的问题和解决方法,以及实施防雷技术布控的必要性、可行性,以保障中波广播发射机的安全运行,确保安全优质播出顺利进行。 相似文献
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无极灯是一种长寿命、低汞害、无频闪的新型电光源,其光效在很大程度上取决于253.7nm共振谱线的辐射效率。通过原子发射光谱分析,实验研究了冷端温度对253.7nm共振谱线的影响规律。研究发现,253.7nm共振谱线的辐射效率随冷端温度变化近似呈正态分布,即无极灯工作存在一个最佳冷端温度。运用气体放电理论对实验结果进行了定性分析,对无极灯光效的提高具有指导意义。 相似文献
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为检测SMT片式元件焊点的质量,减少研究过程中制作实际光源的成本,方便观察各个角度下的焊点形态,研究了仿真光源检测办法。通过建立SMT片式元件焊点模型,比较确定条件下仿真光源和实际光源的效果,确定最佳光照模型。通过改变仿真光源的位置,确定最佳仿真光源的光照位置,从而确定最佳实际光源光照位置。该研究通过Surface Evolver软件建立各种SMT片式元件焊点模型,并通过OPENGL编程完成SMT片式元件焊点模型的转化和光源的仿真过程,该研究对SMT片式元件焊点的检测研究起到优化光源位置结构的作用,对SMT片式元件焊点后期检测提供了坚实基础。 相似文献
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