共查询到20条相似文献,搜索用时 31 毫秒
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在玻璃衬底上制得单层硬脂酸的Langmuir-Blodgett(LB)膜,做为4-戊基-4''-氰基联苯(5CB)液晶的取向层,在取向层上旋涂一层5CB液晶,用透射二次谐波方法测量出5CB液晶分子二阶非线性光学极化率,其值为β=7×10-29esu.对比文献值,测量得到的结果符合较好. 相似文献
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本文系统地研究了由玻璃与液晶构成的非线性光学界面。用一台调Q的红宝石激光器研究了由玻璃与处于各向同性液相的液晶所构成的非线性界面。在不同入射角时非线性界面由内部全反射跃变到部分透射的阈值光强与Kaplen的平面波理论计算结果相一致。在T-Tc=2.5℃条件下测量了时间分辨的非线性界面的反射率。观察到了反射率的滞后迴线。非线性界面的这种反射率的滞后迴线可以归之于液晶分子退取向的弛豫过程。用Ar+激光器研究了玻璃与向列相液晶所构成的非线性光学界面,观察到了由相变而产
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A temperature-induced orientational transition is investigated in a mixture of nematic liquid crystals on the surface of a cleavage of a ferroelectric triglycine sulfate crystal. The transition has been observed by the variation of the polarized absorbance components of a dye introduced into the nematic matrix with increasing temperature. The reorientation of molecules in the liquid crystal volume confined by solid walls is due to competition between dispersion and polar forces at the surface and the decrease in the electric field of the substrate up to its complete disappearance at the ferroelectric Curie point. 相似文献
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世纪之交,物理学科正面临着发展创新的机遇和挑战,液晶物理学科正是物理学家们新的用武之地;液晶器件物理专业正是适应信息显示高新技术产业需要应运而生的前途无量的应用物理学科专业。几年来,河北工业大学应用物理系坚持液晶器件物理特色专业办学方向,毕业生就业形势看好,成为目前国内培养液晶产业工程师的摇篮。 相似文献
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G. M. Zharkova 《实验传热》2013,26(1):83-92
The properties of liquid crystal thermoindicators were investigated in aerodynamic experiments. They are shown to be informative for visualization of the flow around the model and for subsonic and supersonic measurements of substantially inhomogeneous heat fluxes and the temperature fluxes on the model surfaces. The advantages and limitations of liquid crystal thermoindicators compared to other types of thermoindicators are analyzed. 相似文献
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INVESTIGATION OF A QUASI-STEADY LIQUID CRYSTAL TECHNIQUE FOR FILM COOLING HEAT TRANSFER MEASUREMENTS
A quasi-steady technique to simultaneously measure the local heat transfer coefficient and cooling effectiveness on surfaces involving film cooling situations is investigated. The method employs a composite slab consisting of a very thin laminate layer of low-thermal-conductivity material superposed upon a highly conductive metal substrate. The resulting heat transfer in the thin laminate is described by one-dimensional conduction. A very thin coating of thermochromic liquid crystals sprayed onto the surface of the laminate is used in conjunction with a computer image processing procedure to provide local surface temperature data. This information, combined with the substrate and mainstream gas temperatures, provides highly detailed (90 video pixels/cm2) local convection heat transfer distributions. The method is used to conduct flat-plate film cooling experiments consisting of a single row of discrete holes inclined at 35 to the mainstream flow. The local surface temperature is influenced by the combination of two interacting fluid streams at different temperatures. A numerical analysis was performed to assess the assumptions underlying the data reduction procedure. The experimental uncertainty of 7% in the heat transfer coefficient is comparable to prior studies. Furthermore, the uncertainty of 5% in the film cooling effectiveness, coupled with the negligible lateral conduction errors, indicates the present technique offers a unique capability for accurate measurement of the local film cooling effectiveness. 相似文献
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反射式液晶显示光学的理论计算 总被引:5,自引:3,他引:2
本文针对反射式液晶显示模式,在Berreman’s 4×4矩阵和扩展琼斯矩阵的基础上,分别推导了适于金属和介质两种反射镜下的反射式液晶显示光学的理论计算.并模拟了反射式液晶显示在自然光照射下的光电特性、视角光学特性,为反射式液晶显示新模式的开发做了理论上的计算研究. 相似文献