共查询到19条相似文献,搜索用时 62 毫秒
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彩色发光涂料是一种高光效、长余辉的光致发光材料。当对其进行光学测量时,为避免因激发光被探测器接收而对测量结果产生的影响,提出在实验中如何设定特殊的装置,从而保障对发光涂料的光学特性进行有效的测量。根据光度学理论中有关照度和发光亮度的关系,通过实验对三种不同的彩色发光涂料在同样光照条件下的亮度测量,同一种发光涂料在不同颜色光照下的发光亮度比较,以及在彩色发光涂料的亮度衰减情况给出了测量的结果。 相似文献
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本文比较了阴极射线发光的三种激发方式,即连续、脉冲和光栅扫描激发。讨论了在每种激发方式中,为了正确地分析得到的数据所需要的适当的激发密度。研究了缩小的光栅的影响并提出了一个新概念——多次激发(Multiexcitation)。业已表明:在可拆卸系统的小荧光屏上和满尺寸电视显象管(屏)上所作的亮度测量,两者之间缺乏相关性是由于多次激发的缘故。而且,多次激发可以掩盖某些亚线性磷光体,例如硫化物,在高激发密度下的饱和特性,使他们趋于线性。为了避免多次激发,建议利用脉冲或单线扫描光栅对磷光体作评价性测量。 相似文献
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《中国光学与应用光学文摘》2006,(5)
TM923.012006053838照明级大功率LED技术=Large power LEDtechnique forillumination[刊,中]/沈培宏(华东电子集团有限公司.江苏,南京(210028))//灯与照明.—2006,30(1).—42-44介绍了照明级大功率LED的设计和工艺技术,其关键是芯片和封装。最新的二维光子结晶结构极大地提高了发光效率,为照明级大功率的LED的新技术之一。图1参5(杨妹清)TM923.012006053839侧光平板式导光板散射网点设计及仿真分析=Design andsi mulation analysis of scattering netted dots on edge-light-ing flat light guide plate[刊,中]/骆健忠(暨南大学光电… 相似文献
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一、概述随着光学事业的发展,尤其是宽银幕电影技术的发展,开拓了应用柱面透镜来满足对光学仪器特定性能的要求。各种不同的变形镜头,诸如用于摄影的和用于放映的变形镜头,都大量地采用了柱面透镜。因而在光学零件的加工制造上形成了一种不同于为人们所熟知的球面透镜的加工方法,同时也就产生了一些工艺和测量上的问题。本文拟就柱面透镜母线的测量原理、方法、测量工具的制造等方面给予阐述。 相似文献
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前言 光致发光磷光体的发光效率通常由能量效率或量子效率来表示。 发光磷光体在激发光的作用下,发光能量E_1和所吸收激发能量E_2(即产生发光的激发能量中被吸收的能量)之比值E_1/E_2=η_n称作该磷光体的能量效率。 量子效率η_ι为发光磷光体发射的光量子数N_1和产生发光的激发光子中被吸收的 相似文献
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《中国光学与应用光学文摘》2004,(5)
TL506 2004053239 合肥光源慢加速过程中高频系统的调节=RF system adjustment in ramping process of HLS[刊,中]/王琳(中国科学技术大学国家同步辐射实验室。安徽,合肥(230029)),徐宏亮…∥强激光与粒子束。—2004,16(1)。—113-116 相似文献
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Oleksandr A. Skydan Michael J. Lalor David R. Burton 《Optics and Lasers in Engineering》2005,43(7):801-814
The widest used algorithms for 3-D surface measurement using structured fringe patterns are phase stepping and Fourier fringe analysis. The techniques currently employed use mostly monochrome fringe patterns as a tool for phase information measurement and further surface reconstruction. However, the information contained in colour images is much more than that of monochrome, in this case, a new colour technique can be employed to analyse a measured scene with colour fringe patterns.This paper presents a new method for improving the measurement of 3-D shapes by using colour information of the measured scene as an additional parameter. The new method is based on primary colours (red, green and blue) to increase the number of the illuminated fringe patterns, which will remove or significantly reduce the common drawbacks of existing methods. The proposed technique produces a number of coloured structured lighting patterns, which are projected from different angles onto the scene. These patterns are analysed using masking algorithms, a specially adapted multi-colour version of the standard Fourier fringe analysis method and calibration routines. In this way a number of the standard difficulties are overcome. 相似文献
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深紫外波段是目前常规光学技术的短波极限,随着波长的缩短,深紫外光学薄膜开发面临一系列特殊的问题;而对于深紫外光刻系统这样的典型超精密光学系统来说,对薄膜光学元件提出的要求则更加苛刻。本文主要介绍了适用于深紫外光刻系统的薄膜材料及膜系设计;对薄膜沉积工艺、元件面形保障、大口径曲面均匀性等超精密光学元件的指标保障关键问题进行了讨论;对环境污染与激光辐照特性等光刻系统中薄膜元件环境适应性的重要因素进行了深入分析。以上分析为突破高性能深紫外光刻光学薄膜开发瓶颈,更好地满足深紫外光刻等极高精度光学系统的应用需求指明了方向。 相似文献
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There are several practical methods in use today for conducting a residual stress analysis. The principal advantage of the full-field photoelastic coating technique is that any residual stress present in a part is revealed everywhere it occurs over the part's surface after sectioning. This article provides a general introduction to photoelastic analysis, and then describes the photoelastic coating technique in particular, and how it is used for the detection and measurement of residual strain. Case history applications are presented on a metal fan hub, and an injection molded washroom sink. 相似文献
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《Solid State Communications》1986,57(10):805-808
Thin layers of tin disulfide (SnS2) are chemically deposited on glass plates. In an optical investigation of SnS2 layers at room temperature a direct allowed transition at 2.54 eV was recognised. Indirect allowed transition was also observed with an energy gap of 2.28 eV and assisting phonon of 0.05 eV. The cost of one square meter of the coatings was estimated. SnS2 layers prepared by chemical deposition show comparable optical properties with that prepared by high vacuum evaporation technique. 相似文献
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The measurement uncertainty of illuminance and, consequently, luminous flux and luminous efficacy of LED lamps can be reduced with a recently introduced method based on the predictable quantum efficient detector (PQED). One of the most critical factors affecting the measurement uncertainty with the PQED method is the determination of the aperture area. This paper describes an upgrade to an optical method for direct determination of aperture area where superposition of equally spaced Gaussian laser beams is used to form a uniform irradiance distribution. In practice, this is accomplished by scanning the aperture in front of an intensity-stabilized laser beam. In the upgraded method, the aperture is attached to the PQED and the whole package is transversely scanned relative to the laser beam. This has the benefit of having identical geometry in the laser scanning of the aperture area and in the actual photometric measurement. Further, the aperture and detector assembly does not have to be dismantled for the aperture calibration. However, due to small acceptance angle of the PQED, differences between the diffraction effects of an overfilling plane wave and of a combination of Gaussian laser beams at the circular aperture need to be taken into account. A numerical calculation method for studying these effects is discussed in this paper. The calculation utilizes the Rayleigh–Sommerfeld diffraction integral, which is applied to the geometry of the PQED and the aperture. Calculation results for various aperture diameters and two different aperture-to-detector distances are presented. 相似文献