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通过自行设计的测量装置,用专用探测器对173 nm介质阻挡放电产生的紫外光进行辐照度的测试.对着火电压与pd值、紫外光源的辐照度之间的关系进行测量分析,并对试验中所用MgF2晶体的透过率进行测量和计算.实验结果表明对于单个的紫外灯,当介质的厚度、气体气压均为常量的时候,介质阻挡放电强度随电压的增加而增加,放电强度呈非线性增加;在气体种类、介质材料的种类和厚度、电极材料的种类确定的情况下,紫外灯的点火电压与pd值会有一个最小值;在大气压下,通过特殊方法测得厚度为2 mm的MgF2晶体对173 nm真空紫外光的透过率为88%. 相似文献
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一种新型的紫外光源--准分子紫外灯 总被引:1,自引:1,他引:1
非相干性紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术.本文着重介绍一种使用介质阻挡放电激发紫外或真空紫外辐射的新型光源--准分子紫外灯,包括准分子的形成以及光源的紫外辐射效率.最后,对影响准分子辐射的因素如气压、气体组成、温度及电源频率和电压进行了初步的分析. 相似文献
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真空紫外辐射有高于共价键键能的光子能量,可在室温下激起化学反应。自上世纪80年代,基于稀有气体介质阻挡放电的准分子真空紫外光灯面世以来,真空紫外光源有了很大的发展,商业化的准分子真空紫外光灯已有上百mW/cm2的光能输出,品种也不断增加。准分子真空紫外光灯强大的激发化学反应的能力已在材料科学、化学反应工程、生物医学等方面开拓了许多新的研究课题,并得到日益增多的实际应用。近20年,每年关于准分子真空紫外辐射材料加工的研究报道急剧增加,本文将简要介绍DBD准分子紫外光源的特点及其在材料加工中的研究和应用,包括无机薄膜制备、半导体材料氧化、材料表面清洗、过渡金属化合物还原、高分子合成和聚合物表面改性。 相似文献
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为深入理解彩色交流等离子体显示屏的气体放电机制及提高器件性能,对三元混合气体He-Ne(26%).Xe(3.7%)放电的辐射光谱组成和光谱线的瞬态过程进行了实验研究。通过采用高速增强型CCD(ICCD)和光电倍增管(PMT)测量混合气体不同压强时,在一个维持电压脉冲期间,放电所产生的真空紫外和红外各主要谱线的强度随时间的变化,研究了充气压强对谱线强度、辐射延迟、辐射持续时间的影响,并分析了放电产生的真空紫外辐射总强度和可见光光谱线强度随充气压强的变化关系。实验结果表明,随着充气压强的提高,真空紫外和红外光谱辐射延迟缩短,辐射持续时间减小,并且真空紫外辐射总强度增大,可见光强度减小。 相似文献
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非相干紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术.本文着重介绍了介质阻挡放电产生173 nm紫外光的原理,并设计制作了利用此方法获得173 nm真空紫外光的装置.试验结果表明,用石英玻璃作介质阻挡层,Xe气体作为放电气体,能够获得峰值波长为175 nm,半高宽为12 nm的窄带大面积真空紫外光,并对其输出光谱进行分析. 相似文献
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一种新型的紫外光源—准分子紫外灯 总被引:6,自引:0,他引:6
非相干性紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术,本着重介绍一种使用介质阻挡放民激发紫外或真空紫外辐射的新型光源--准分子此外灯,包括准分子的形成以及光源的紫外辐射效率,最后,对影响准分子辐射的因素如气压,气体组成,温度及电源频率和电压进行了初步的分析。 相似文献
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McIntyre SE 《Accident; analysis and prevention》2008,40(2):691-696
Rear-end collisions and distraction are major concerns and basic research in cognitive psychology concerning attention in visual search is applicable to these problems. It is proposed that using yellow tail lamps will result in faster reaction times and fewer errors than current tail lamp coloring (red) in detecting brake lamps (red) in a "worst case" scenario where brake lamp onset, lamp intensity and temporal and contextual cues are not available. Participants engaged in a visual search for brake lamps in two conditions, one using red tail lamps with red brake lamps and one with the proposed combination of yellow tail lamps with red brake lamps in which they indicated by keyboard response the presence or absence of braking cars. The hypothesis that separating brake and tail lamps by color alone would produce faster RTs, reduce errors, and provide greater conspicuity was supported. Drivers and non-drivers detect absence and presence of red brake lamps faster and with greater accuracy with the proposed yellow tail lamps than red tail lamps without the aid of any of the aforementioned cues. Vehicle conspicuity will be improved and reductions in rear-end collisions and other accidents will be reduced by implementing the proposed yellow tail lamp coloring. 相似文献
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目的通过研究参数化技术在灯具设计中的应用,从而为其发展和实践提供借鉴和指导。方法从用户分析、形态评估、动态分析、生产优化等方面对灯具的参数化设计实例进行研究,验证参数化设计的相关结论以及基于Grasshopper插件的设计流程,并结合案例论证其可行性。结论将参数化设计运用到工业产品设计中,推动工业设计领域的发展,创造出新的设计思维方式和设计流程,从而开创出一种设计新风尚。 相似文献
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Edward A. Early Ambler Thompson 《Journal of research of the National Institute of Standards and Technology》1996,101(2):141-153
Spectral irradiance calibrations often require that irradiance standard lamps be oriented differently than the normal calibration orientation used at the National Institute of Standards and Technology and at other standards laboratories. For example, in solar measurements the instruments are generally upward viewing, requiring horizontal working standards for minimization of irradiance calibration uncertainties. To develop a working standard for use in a solar ultraviolet intercomparison, NIST determined the irradiance of quartz-halogen lamps operating in the horizontal position, rather than in the customary vertical position. An experimental technique was developed which relied upon equivalent lamps with independent mounts for each orientation and a spectroradiometer with an integrating sphere whose entrance port could be rotated 90° to view either lamp position. The results presented here are limited to 1000 W quartz-halogen type lamps at ultraviolet wavelengths from 280 nm to 400 nm. Sources of uncertainty arose from the lamps, the spectroradiometer, and the lamp alignment, and increased the uncertainty in the irradiance of horizontal lamps by less than a factor of two from that of vertical NIST standard lamps. The irradiance of horizontal lamps was less than that of vertical lamps by approximately 6 % at long wavelengths (400 nm) to as much as 12 % at the shortest wavelengths (280 nm). Using the Wien radiation law, this corresponds to color temperature differences of 15.7 K and 21.3 K for lamps with clear and frosted envelopes, respectively. 相似文献
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Novel Tb3+ and Mn2+ activated Ca8MgGd(PO4)7 phosphors were synthesized by solid-state reaction and their photoluminescence properties in vacuum ultraviolet region were investigated for the first time. It can be observed from the excitation spectra that the host-related absorption band is located around 170 nm, and it overlaps the O2− → Tb3+ charge transfer band of Ca8MgGd(PO4)7:Tb3+ around 161 nm and the 3d5 → 3d44s transition band of Ca8MgGd(PO4)7:Mn2+ near 200 nm. The 4f-4f 5d spin-allowed and spin-forbidden transitions of Tb3+ are verified to be located at 170-250 and 257-271 nm, respectively. Upon 147 nm excitation, the dominant emission peak intensity of the Ca8MgGd0.1(PO4)7:0.9Tb3+ phosphor is about 2.7 times stronger than that of the commercial Zn2SiO4:Mn2+ green phosphor, and the brightness of the former with a short decay time of 2.5 ms is about 98% of the latter’s. The Ca8MgGd(PO4):Mn2+ phosphor excited at 147 nm exhibits a deep red emission around 650 nm, which could be attributed to the 4T1 → 6A1 transition of Mn2+, with the CIE index (0.679, 0.321). In a word, the results above indicate that both Tb3+ and Mn2+ activated Ca8MgGd(PO4)7 phosphors could be promising for PDP or Hg-free lamp applications. 相似文献
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LED灯具光通量的计算方法是为了解决LED灯具生产前LED灯芯选用问题。LED灯具生产,LED灯芯的选用是至关重要的,它直接影响LED灯具的产品质量及生产效率。 相似文献
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中国传统器具的设计观 总被引:2,自引:2,他引:0
通过对中国古代灯具主题性的研究,对中国古代的设计观进行梳理,寻找对当代设计有借鉴与启示意义的传统设计思想,从设计艺术学的角度对中国古代灯具造型设计特征、设计理念以及设计思想进行分析,得出了中国古代器物设计制器尚象的造型设计特征、以人为本的设计理念以及器以载道的设计思想。 相似文献
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目的对于中国传统灯具的研究有助于传统文化的承继与发展,同时也为当今的灯具设计提供素材与路径。方法首先从造型和装饰两个方面分析了传统灯具的设计特征,并从符号学的视角讨论了传统灯具所蕴含的文化思想,再通过对传统灯具"形"和"意"的重构与分析,把握传统灯具符号的内涵与外延,探讨传统灯具符号元素在今天的灯具设计中的应用。结论从传统灯具符号的语义内涵入手,用对传统手工艺进行再创造的方式,创作出适应现代生活和环境的灯具作品,既是对我国传统文化的继承,也是对设计行业文化层面的提升。无论从文化传承还是实际运用,都要求当下的设计尽可能地从传统灯具符号的内涵着手,用整体的传承方式和再创造的方式,实现我国传统灯具的再生与创新。 相似文献
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阐述了一种立式双开门汽车灯具高真空镀膜机的系统原理及结构特点,重点介绍了离子轰击、清洗系统在该设备中的应用,并对最终产品进行了测试和分析。测试表明:灯具反射镜在波长390~770 nm段的反射率高达92%,达到并超过国家标准80%的要求;灯具反射镜劣化试验显示:保护膜对镀铝膜的保护效果良好,样品在30min内无腐蚀现象;胶带附着力及百格试验测试没有观察到膜层脱落现象。 相似文献