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绿色照明工程中薄膜材料的开发和应用 总被引:1,自引:0,他引:1
将薄膜材料应用于光源和器具中提高了效率,改善了特性,从而加速了绿色照明的进程。本文主要介绍了用于高效节能光源和器具中的主要薄膜材料,如红外反射膜、选择性透射膜、保护膜、透射导电膜及光触媒体材料等。本文还介绍了这些薄膜材料的工作机理、制造、特性和应用。 相似文献
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介绍了双向反射分布函数的测量原理和方法,搭建了双向反射分布函数的测量装置。该装置可以测量可见光和红外两个波段的双向反射分布函数。在可见光波段采用卤钨灯作为光源,采用光纤光谱仪作为光接收器,以10 nm的波长间隔测量双向反射分布函数。在红外波段采用碳化硅作为红外光源,采用热释电探测器作为光接收器,采用标准板相对定标的方法测量待测样板的双向反射分布函数。可见光波段双向反射分布函数的测量重复性不大于1.5%;3μm~5μm红外波段双向反射分布函数的测量重复性分别小于或等于2.5%、8μm~12μm波段的小于或等于3.0%。测量结果表明,该测量装置的有效性较高。 相似文献
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研究了热丝CVD金刚石薄膜的红外反射吸收谱,讨论了金刚石薄膜中H、N等杂质和晶粒晶型、晶粒尺度对膜红外透过率的影响。 相似文献
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本发明提供一种光谱反射比传感器.它包括两个光源、两个接收器、一个信号调节器和一个微处理器.一个光源用于发射红光的调制光束,另一个光源用于发射近红外光的调制光束;一个接收器用于接收红光或近红外光的反射光,另一个接收器用于接收来自红光源或红外光源的入射光;信号调节器对调制产生响应,从而将接收器响应来自光源的反射光和入射光后产生的信号同由环境光产生的信号区分开来. 相似文献
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由于红外辐射本身的特性所决定,把它用在航空或海上导航方面是有一定好处的。若是可见光方法不能用或是得不到所要求的数据的情况下以及雷达精度降低时都用红外法来补足。红外辐射是物体发射的并随物体本身的绝对温度的变化而变化;这是能量交换的结果。红外辐射与可见光有所不同,可见光是物体对外部光源产生反射的结果(例如太阳作外光源)。因此,物体的绝对温度变化相当 相似文献
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用于气体传感的一维光子晶体窄带红外发射光源 总被引:2,自引:1,他引:1
基于有限一维光子晶体表面电磁波理论,以探测CO_2为例,设计了一个中心波长为4.23μm,发射率大于99%,发射谱线半高宽FWHM=49.9nm的窄带准相干红外发射光源.采用传输矩阵方法对这种光源进行了理论分析,并用时域有限差分(FDTD)方法对器件垂直入射时的反射谱和稳态电场分布进行了数值仿真,仿真光谱特征和理论计算得到的结果吻合,证明了这种窄带红外发射光源的可行性. 相似文献
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介绍了多种光学膜的性能。这些膜在反射型LCD中起了重要作用。使用这些新型光学膜使反射型LCD具有更高的亮度,更宽的视角。 相似文献
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紫外汞灯PVD二氧化硅薄膜特性研究 总被引:1,自引:0,他引:1
本文论述了紫外汞灯Hg敏化PVD SiO_2薄膜的原理及方法,讨论了PVD SiO_2薄膜的光学特性、结构特性、电学特性、附着力及应力,并分析了薄膜的成份。 相似文献
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STN-LCD技术的发展 总被引:1,自引:8,他引:1
介绍了目前人们对改善STN-LCD特性所取得的一些研究进展,主要包括反射式STN-LCD彩色显示,高分辨率STN-LCD用液晶材料,采色STN-LCD用彩色滤光膜,以及STN-LCD用光学膜,如偏振片、相位差补偿膜等。 相似文献
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Hitoshi Sai Takuya Matsui Kimihiko Saito Michio Kondo Isao Yoshida 《Progress in Photovoltaics: Research and Applications》2015,23(11):1572-1580
Dielectric films with anti‐reflective sub‐wavelength structures are applied to thin‐film silicon solar cells to improve the light incoupling at the front surface. It is verified that modification of the refractive index of the incident medium using dielectric films with sub‐wavelength structures is beneficial to reduce the average reflectivity of Si solar cells with an anti‐reflective coating based on optical interference. It is also shown that the sub‐wavelength structure must be combined with a proper light‐trapping texture to enhance the absorption within thin‐film silicon solar cells. The effectiveness of dielectric films with sub‐wavelength structures is demonstrated by an increase of the short‐circuit current density of a microcrystalline silicon cell from 29.1 to 30.4 mA/cm2 in a designated area of 1 cm2. The optical interplay between the dielectric films and the light‐trapping textures is also discussed. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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William R. Folks Sidhartha K. Pandey Greg Pribil Dennis Slafer Monis Manning Glenn Boreman 《Journal of Infrared, Millimeter and Terahertz Waves》2006,27(11):1553-1571
High resolution reflective ellipsometry is used to study freely suspended plastic films. We determine room temperature optical constants in the infrared for a variety of plastics using ellipsometry. The films are typically 6 to 100 μm thick and measurements are performed from near infrared to long wave-IR. The setup includes modeling software to fit the ellipsometric data to a generalized oscillator model. The films studied include acrylics, fluoropolymers, and variations of polyethylene, polystyrene, and polyvinyl chloride (PVC) among others. We are able to determine in-plane and out-of-plane optical constants. Transmission spectra from FTIR measurements are plotted and compared with ellipsometry results. 相似文献
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Thin alloy films of palladium(Pd) and silver(Ag) are deposited onto glass substrates via the direct current(DC) magnetron technique.The hydrogen sensor probe consists of optical fiber bundle and Pd/Ag optical thin film.when the sensor is exposed to hydrogen,the refractive index of Pd/Ag optical thin layer will diminish and cause attenuation changes of the reflective light.It is observed that the thickness of Pd/Ag alloy layer can affect the hydrogen sensor signal.Under different substrate temperatures,several Pd/Ag samples are coated with different thicknesses of Pd/Ag alloy,and the results of a hydrogen sensor based on reflective light from the Pd/Ag alloy thin film are discussed. 相似文献
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Teng-Kai Shih Jeng-Rong Ho Chia-Fu Chen Chueh-Yang Liu Wha-Tzong Whang 《Microelectronic Engineering》2008,85(1):175-180
This paper reports the fabricated method and optical performance of soft, reflective elements with nonspherical surface. Based on excimer laser microdrilling and spin coating processes, a PMMA film suspended on microdrilled holes was used as a concave mold. Then, a high-reflectance material, mixed PDMS rubber polymers with TiO2 nanoscale powders, was cast on the PMMA mold. Finally, both of concave and convex elements could be fabricated through soft replica molding processes and these elements could directly reflect light without the deposition of metal coatings. Therefore, we proposed a model regarding a flexible cable with its weight suspended on fixed points to explain the formation mechanism of PMMA molds. With the change of diameters of microholes and thicknesses of PMMA films, the suspended height of films was surely controllable. Therefore, the curvature radiuses and shapes of these aspherical elements also depended on the diameters of microholes and the thicknesses of PMMA films. Experimental results demonstrated that soft reflective elements have good surface qualities and high-quality optical properties. Besides, all fabrication steps can be executed in ambient environment and at low temperature, the proposed method has a potential for mass production. 相似文献