阳离子对Er3+掺杂硼酸盐玻璃结构和发光特性的影响

针对Si/Al掺杂量增大使BaO-(1-x)SiO₂-xAl₂O₃-B₂O₃-0.005Er³⁺(x=0,0.5,1,摩尔分数)玻璃样品的1 540 nm红外发光和540 nm上转换发光强度呈现相反的变化趋势,讨论了阳离子掺杂对稀土离子周边对称性和电负性变化与荧光行为的内在关系。红外傅里叶透射光谱显示,不同掺杂浓度下样品的最大声子能量没有明显变化,说明光谱随掺杂浓度的变化与玻璃体系的最大声子能量无关。根据Judd-Ofelt理论计算了⁴I_13/2和⁴S_3/2能级的光学参数,通过比较两能级的跃迁几率(A)、寿命(τ)、荧光分支比(β)和受激发射截面(σ)等光学参数,发现⁴I_13/2能级和⁴S_3/2能级的相关参数呈现相反的趋势。最后测试了样品⁴I_13/2能级下1 540 nm的寿命,进一步从电负性角度考虑了样品的发光效率。理论计算和实验结果相符。     

手持红外热像仪自动对焦电路的设计与实现

自动对焦可以快速、准确地将镜头调节到最佳位置,但目前该方式在算法和电路设计上还不够成熟,制约了它的应用。通过优化电路设计,选用TMS320VC5509A、FIFO和串口FLASH等低功耗、小尺寸封装芯片组成低功耗自动对焦电路,并基于Sobel算子的Tenengrad的改进图像边缘能量评价函数,采用可变窗口、合适的阈值,配合粗调（定步长）和精调（可变步长）搜索算法,设计实现了一种手持红外热像仪快速、准确地自动对焦的电路。实验结果表明,该方法高效可行,不仅能实现手持红外热像仪对目标的快速捕获,并能降低操作强度。     

一种基于NSCT变换的红外与可见光图像融合算法

针对红外与可见光图像融合,提出了一种基于NSCT变换的图像融合方法。对经NSCT变换的低频子带系数采用基于区域能量自适应加权的融合规则,对高频子带系数采用混合的融合方法,即对于低层,采用基于区域方差选大的融合方法,对于高层采用像素点的绝对值选大的融合方法。实验结果表明,该融合算法可以获得更多的细节信息,能获得较理想的融合图像。     

大视场红外同心光学系统的设计

研究了同心光学系统的成像特性以及设计方法,分析了厚透镜的成像理论。设计了工作在3．7～4．8μm、视场15°的红外同心光学系统,该系统具有接近衍射极限的成像质量。对红外同心光学系统各个视场的传递函数进行了测试,结果表明该系统具有较好的成像质量,且成像特性和同心光学系统的成像原理是一致的。     

Evolution of the 251 cm-1 infrared phonon mode with temperature in Ba0.6K0.4Fe2As2

The far-infrared optical reflectivity of an optimally doped Ba1-xKxFe2As2(x =0.4) single crystal is measured from room temperature down to 4 K. We study the temperature dependence of the in-plane infrared-active phonon at 251 cm-1 . This phonon exhibits a symmetric line shape in the optical conductivity, suggesting that the coupling between the phonon and the electronic background is weak. Upon cooling down, the frequency of this phonon continuously increases, following the conventional temperature dependence expected in the absence of a structural or magnetic transition. The intensity of this phonon is temperature independent within the measurement accuracy. These observations indicate that the structural and magnetic phase transition might be completely suppressed by chemical doping in the optimally doped Ba0.6K0.4Fe2As2 compound.     

高分辨率制冷型中波广角红外成像系统的光学设计

设计了一个F数为2,工作波段为3.7～4.8μm,全视场2ω=111.2°的高分辨率制冷型中波广角红外成像光学系统。该系统采用二次成像构型,通过Si、Ge、ZnSe三种材料六片式对称布局,利用折/衍混合器件及非球面,实现了光学被动消热差设计,使系统在-55℃至+80℃的宽温范围内,在空间频率为33lp/mm处的光学传递函数(MTF)均大于0.4,系统在15μm的像素尺寸内,能量集中度大于70%;采用f-θ设计,使成像系统对不同视场具有相同的角分辨率;通过引入光阑像差和控制像方视场角,使像面具有较好的均匀性,边缘视场最低相对照度为中心视场的90.9%,且具有近100%的冷光阑效率,同时,系统具有较好的冷反射抑制效果,该光学系统适用于像素为15μm,分辨率为640pixel×512pixel的中波制冷探测器。     

光学读出非制冷红外成像技术的光学灵敏度分析

不同于传统的非制冷红外成像技术,提出了基于微电子机械系统(MEMS)的新概念光学读出非制冷红外成像技术。它的光学读出系统基于空间刀口滤波原理,具有高灵敏度、高分辨率和高抗震性等优点,但同时也受到了反光板的弯曲变形、粗糙度等复杂因素的影响。在大量实验数据的基础上,利用夫琅禾费近场衍射理论,建立了复杂因素下光学灵敏度的理论分析模型,详细分析了刀口滤波位置、反光板的长度、曲率半径、粗糙度、LED光源的强度以及扩展宽度等对光学灵敏度的影响,并提出了通过极限操作使系统的光学灵敏度最大化的光学优化方法。     

水热法制备一维钛酸纳米材料及其在太阳光反射涂料中的应用研究

以微米级二氧化钛(P25)为原料,用水热法制备了一维纳米钛酸材料,分析了纳米钛酸的形貌、红外特性和晶体结构。并进一步对纳米钛酸作为太阳光反射涂料填料的效果进行了研究,其涂层在可见光波段(380～780 nm)范围平均反射率可达到76.15%,在红外波段(780～2500 nm)范围平均反射率可达47.34%。     

Complexes of 8-Aminoquinoline. I. The Infrared Spectra of the Ligand,the Tris Complexes of Iron,Cobalt and Nickel Perchlorates and Their ND2 Analogues

Abstract

Deuteration of 8-aminoquinoline (aq) at the amino groups and comparison of the infrared spectrum of aq with those of aniline and quinoline enables reliable assignments to be proposed for the amino stretching and bending modes and the internal modes of the aminoquinoline rings. The spectra of the tris(8-aminoquinoline) complexes of iron, cobalt and nickel perchlorates have been examined over the range 4000–50 cm^?1 with assignments based on the ligand study and the effects of metal ion substitution and deuteration of the nickel complex. The existence of two vM-NH₂ and two vM-N(aq) bands is consistent with facial (cis-cis) octahedral coordination about the metal ion.     

Mononuclear copper(I) complexes with triphenylphosphine and N,N′-disubstituted thioureas: synthesis,characterization, and biological evaluation

Abstract

Twelve new complexes, of the general formula CuCl(TPP)₂Tu^1–12 (Tu?=?thiourea), were synthesized by the reaction of CuCl(TPP)₃ (TPP?=?triphenylphosphine) and various N,N′-disubstituted thioureas. The structures of the synthesized complexes were characterized by different techniques such as Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy (¹H, ¹³C, ³¹P, and ¹⁹F), and the representative complexes (1, 2 and 12) were analyzed via single crystal X-ray diffraction. The single crystal X-ray analysis revealed that copper(I) is coordinated with chlorine, two TPP, and the thiourea ligands through the sulfur atom in a mononuclear distorted tetrahedral mode. The compounds were tested for antibacterial, antifungal, cytotoxicity, antileishmanial, and antioxidant activities. The results showed that the synthesized complexes are significantly more active than the free ligands and the commercial reference compounds. The high biological activities of the complexes versus free ligands can be attributed to the copper(I) chloride complexation with thiourea ligands. The synthesized complexes were also evaluated, both experimentally and theoretically, for DNA binding studies. The UV-visible spectroscopic and molecular docking studies demonstrated that the complexes are conjugating with DNA through a groove binding mode.