水平场景无畸变折反射全景成像系统透镜畸变的消除

采用短焦距透镜设计水平场景无畸变折反射全景成像系统,会使系统更加小型化,然而短焦距透镜的畸变会对系统成像产生影响。为此建立了具有径向畸变的相机模型;根据这一相机模型,研究了采用短焦距摄像头的水平场景无畸变折反射全景成像系统中,透镜畸变对系统成像的影响,结果表明短焦距透镜的畸变会对系统成像产生严重影响;为了消除透镜畸变的影响,对反射镜的设计进行了改进,在反射镜面形微分方程中包含了透镜畸变消除的参量;按新的方法,设计了一套由短焦距摄像头组成的水平场景无畸变折反射全景成像系统。     

Optical properties of a high-efficiency glass ceramic X-ray storage phosphor

The turbidity, photoluminescence, and photo-stimulated luminescence (PSL) of fluorozirconate glass containing barium chloride nano- and micro-crystals have been measured for samples prepared by isochronal (70 min) annealing over a temperature range of 220–283°C, and correlated with the microstructure as determined by X-ray diffraction measurements. Crystallization of hexagonal phase barium chloride commences at around 220°C, but until 275°C the material retains excellent transparency although it displays negligible PSL. Between 275°C and 277°C, the hexagonal phase converts to the orthorhombic phase, the transparency abruptly decreases, and the PSL rises to a value of around 13% of that found for the commercial storage phosphor BaFBr:Eu. For a slightly higher temperature of 280°C, new phases appear which correspond to the onset of bulk crystallization, and at 283°C the relative PSL rises to 33%, while the transparency falls further. The trade-off between optical transparency and PSL over this narrow temperature window for X-ray imaging plate applications is briefly discussed.     

碲酸盐玻璃的拉曼光谱研究

本文测试了TeO2-ZnO和TeO2-BaO两种二元系统不同金属氧化物浓度下玻璃的拉曼光谱,通过比较这两种碲酸盐玻璃系统拉曼光谱的异同,表明碲酸盐玻璃系统中随着金属氧化物浓度的增加,使玻璃网络中的TeO4双三角锥向TeO3三角棱锥转化,并且在TeO2-BaO二元玻璃中出现了非桥氧键。同时初步研究了TeO2-ZnO-Na2O三元玻璃的拉曼光谱,发现当TeO2-ZnO二元玻璃中加入5mol%的Na2O时,其结构并没有发生显著的变化。     

利用计算机辅助装调检测矩形大口径离轴非球面的方法研究

通过非球面的零位补偿法,完成了对矩形大口径离轴非球面镜的检测。先用光学设计软件Zemax从理论上分析了在检测中会出现的现象,并结合计算机辅助装调技术,确定在检测过程中相对敏感的自由度,然后控制这些量,使补偿器和非球面的相对关系与理论设计相吻合,在Zygo相位干涉仪上测得最终结果。在λ=632.8nm时,中心圆口径与两个边缘圆口径面形误差RMS分别为0.022λ,0.037λ,0.032λ。检测结果,达到预期目的。     

离子速度影像装置及其在CCl3Br光解动力学研究中的应用

建立了一套高分辨的离子速度影像装置。在这套装置中,离了透镜的设计是利用Simion7．0应用程序对电场中离子的空间分布进行模拟“聚焦”得到的,达到了将离了源空间分布中速度相同而位置不同的离子聚焦在同一点上的效果。利用这套装置研究了CCl3Br在267nm附近的光解反应产物Br(^2P3.2)和Br^*(^2P1.2)的速度和角度的分布,得到了β(Br)=-0．48,β(Br^*)=1．44。     

CCD摄像机的误差及其检校

在利用面阵CCD摄像机进行摄影测量和检测的系统中,CCD摄像机所产生的误差是系统的主要误差,这种误差是在图像输入的过程中产生的。CCD摄像机的误差一般分光学误差、机械误差和电学误差。在摄像机光学镜头与CCD器件质量比较好的情况下,其主要表现是电学误差,重点讨论电学误差及其检测。     

溶胶-凝胶生物活性玻璃在SBF中反应的形貌特征

利用溶胶 凝胶生物活性玻璃粉末二次烧结工艺 ,制备了CaO P2 O5 SiO2 系统溶胶 凝胶生物玻璃 ,并以其为原料制备了用于骨修复及骨组织工程支架的块状多孔生物活性材料 .并应用体外实验 (invitro)方法和XRD、SEM、FTIR技术研究了此烧结材料的显微形貌、晶相、和生物活性 .结果表明 ,经 80 0℃烧结 5min后 ,材料有硅磷酸钙 (Ca5(PO4 ) 2 SiO4 ,5CPS)析出 ,在模拟体液 (SBF)中浸泡 ,随着时间的增长 ,玻璃表面最初形成的无定形钙磷化合物矿化成碳酸羟基磷灰石 (HCA)纳米团簇 ,并逐渐相互融合形成HCA覆盖层 ;且HCA只在烧结体的玻璃相 (SG相 )表面生成 ,在 5CPS微晶相表面未发现HCA .     

Comparative study of spectroscopic properties of Er^3＋／Yb^3＋-codoped tellurite glass and fibres under 980nm excitation＊

A tellurite fibre of TeO_{2}－ZnO－La_{2}O_{3}－Li_{2}O glass codoped with 20000 ppm ytterbium and 5000 ppm erbium was fabricated by the suction casting and rod-in-tube technologies. The absorption spectrum of Er^{3+}/Yb^{3+} -codoped bulk glass has been measured. From the Judd－Ofelt intensity parameters, the spontaneous emission probability and radiative lifetime τ_{rad} of Er^{3+}:{}^{4}I_{13/2}→{}^{4}I_{15/2} transition for the bulk glass have been calculated. The emission fluorescence spectra and lifetimes around 1.5μm, and subsequent upconversion fluorescence in the range of 500－700nm were measured in fibres and compared with those in bulk glass. The changes in amplified spontaneous emission with fibre length and pumping power was also measured. It was found that the emission spectrum from erbium in fibres is almost twice as broad as the corresponding spectrum in bulk glass when pumped at 980nm.     

Study of the microstructural transformations of borate glass and barium metaborate crystals induced by femtosecond laser

This paper describes the microstructural transformations of borate glass and barium metaborate crystals induced by femtosecond laser. Such structural transformations were verified by Raman spectroscopy. The borate glass is transformed into low temperature (LT) phase of barium metaborate (BaB_2O_4) crystals after being irradiated for 10 min by a femtosecond laser. In addition, after 20 min of irradiation, high temperature (HT) phase of BaB_2O_4 crystals is also produced. Further studies demonstrate that LT phase BaB_2O_4 crystals are formed in the HT phase BaB_2O_4 crystals after femtosecond laser irradiation for 10 s.     

新型菲涅尔线聚焦聚光太阳电池组件研究

以聚甲基丙烯酸甲脂为材料,采用热压成型工艺加工成型线聚焦菲涅尔聚光透镜(8×),可用于空间、地面光伏系统太阳电池组件的聚光系统,并对在其聚光条件下,太阳电池的电流电压特性进行测试,结果表明,该菲涅尔线聚焦棱镜能有效提高太阳电池的单位输出功率.模具的机械加工精度和光学抛光精度低,是造成其部分聚光率损失的原因.