沈阳航空航天大学 电子信息工程学院, 辽宁 沈阳 110163
由于声表面波(SAW)测温技术因具有无源无线的特点而备受研究人员的广泛关注。该技术可应用在电缆接头内部的温度测量中, 但因受电缆接头材料和结构的影响, 使SAW测温信号传递受阻, 严重影响了温度信号的检测。该文基于DWG-630A型电缆接头的结构和材料, 设计了一款可用于电缆接头内部测温的天线。通过其理论分析、仿真及试验验证, 证明该设计切实可行。结果表明, 穿过电缆接头可传递SAW温度信号, 并在工作频段内具有良好的增益和辐射效果。
电缆接头 声表面波温度传感器 天线 cable joints surface acoustic wave (SAW) temperature sensor antenna HFSS HFSS
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
2 中国科学院大学, 北京 100049
介绍了无线激光与射频(RF)互补通信系统的突出地位和重大成果,说明了无线激光与RF互补通信技术的优越性和重要性。描述了无线激光与RF互补通信的系统结构,说明无线激光与RF互补通信系统研究的可行性。结合国外近年来的互补通信系统最新研究成果,重点对遇到的一系列问题进行分析。指出了互补通信系统现阶段面临的挑战,阐述了应对这些挑战的关键技术,并指出其应用前景和发展趋势。
光通信 无线激光与射频互补通信 切换技术 自适应光学 光自动增益控制 自适应均衡 频率选择 激光与光电子学进展
2019, 56(6): 060004
1 鞍山师范学院化学与生命科学学院, 辽宁 鞍山 114007
2 沈阳化工大学配位化学研究室, 辽宁 沈阳 110142
合成了配合物［Ni(2,2′-biby)(H2O)4］·(Htba)2·5H2O单晶, 分子式中2,2′-biby为2,2′-联吡啶, H2tba为2-硫代巴比妥酸。 通过红外光谱、 元素分析和单晶X-射线衍射表征其结构, 单晶X-射线衍射结果表明, 该配合物单晶属于正交晶系, Pbca 空间群, 晶胞参数为a=13.662(2) , b=19.470(4) , c=21.590(4) 。 应用紫外光谱和荧光光谱研究了其与鲱鱼精DNA/牛血清白蛋白(BSA)的相互作用, 研究结果表明, 标题化合物与DNA为静电结合, 对牛血清白蛋白发生静态猝灭作用。
配合物 DNA作用 BSA作用 晶体结构 Coordination complexes DNA binding BSA binding Crystal structure
Author Affiliations
Abstract
Key Laboratory of Advanced Micro-Structured Materials MOE, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
A Schwarzschild microscope with a numerical aperture of 0.2 and a magnification of 130 in a 100 μm field of view (FOV) is designed and is working at 13.5 nm. Meanwhile, a CCD is used as a detector with a pixel size of 13 μm×13 μm and imaging area of 13 mm×13 mm. The imaging quality with tolerances of system and errors of mirrors are considered. We obtain that the best on-axes object resolution can be up to about 200 nm, the average value is 230 nm, and the resolution is about 360 nm at 80 μm FOV.
340.7480 X-rays, soft x-rays, extreme ultraviolet (EUV) 120.4640 Optical instruments 220.2740 Geometric optical design Chinese Optics Letters
2017, 15(4): 043401
Author Affiliations
Abstract
1 School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China
2 Research Center of Laser Fusion, CAEP, P. O. Box 919-987, Mianyang, 621900, China
Hollow poly(alpha-methylstyrene) (PAMS) shows application in inertial confinement fusion experiments as the degradable mandrels of glow plasma polymer shells. However, the molecular weight of PAMS has great influence on the quality of mandrels. In this work, this influence was systematically studied using several PAMS samples with different molecular weights. For PAMS shells with 900 μm inner diameter and different wall thickness, when the molecular weight of PAMS is in the range of 300-500 kg·mol-1, perfect sphericity and good wall thickness uniformity can be obtained. In contrast, when increasing molecular weight to 800 kg·mol -1, the sphericity and the wall thickness uniformity become worse. Moreover, compared with the wall uniformity, the sphericity of PAMS shells was much less sensitive to the molecular weight. The results also showed that the stability of W1/O compound droplets of PAMS shells were less affected by the molecular weight. It was revealed that the wall uniformity and the sphericity of the PAMS shells were associated with the diffusion rates of fluorobenzene (FB).
Poly(alpha-methylstyrene) Poly(alpha-methylstyrene) Molecular weight Molecular weight Sphericity Sphericity Wall thickness uniformity Wall thickness uniformity Diffusion rate Diffusion rate Matter and Radiation at Extremes
2017, 2(4): 197
东北师范大学地理科学学院, 吉林 长春 130024
高光谱遥感被越来越多的应用于确定混合像元的地物组分和比例。 将不同面积比例的植被-土壤混合像元作为研究对象, 使用偏振装置和 ASD FieldSpec3 光谱仪得到植被—土壤组成的混合像元的偏振反射光谱曲线, 计算得到八种植被指数值, 讨论不同面积比例, 不同偏振角度下植被-土壤混合像元的高光谱偏振特性。 研究发现, 随着叶片占混合像元面积比例的增大, 植被-土壤光谱曲线越来越明显地表现出植被光谱“五谷四峰”的特性, 且峰值与谷底的位置与植被光谱基本相同。 偏振角越大, 混合像元的光谱偏振反射比越大; 混合像元条件下, 植被所占混合像元的面积比例越大, 光谱受偏振角的影响越大。 各植被指数与混合像元中植被面积大小呈线性关系, 其中植被衰减指数和改进红边归一化植被指数的相关系数最大, 可以达到98%左右, 适合用于建立植被指数与植被占混合像元面积比例之间的相关模型。 在植被面积发生变化时, 改进红边比值植被指数的灵敏性更好。 在利用光谱吸收特征参数进行植被指数估算时, 发现吸收谷深度与光化学植被指数的二次函数模型拟合度最强, 决定系数R2为0.963 3; 光谱吸收指数与光化学植被指数的二次函数模型拟合度最强, 决定系数R2为0.960 5。
高光谱 偏振 混合像元 高光谱植被指数 光谱吸收特征参数 Hyperspectral Polarization Mixed pixel Hyperspectral vegetation index Spectral absorption characteristic parameters 光谱学与光谱分析
2017, 37(11): 3549
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
2 中国科学院大学, 北京 100039
设计并实现了一种并行循环移位比较的帧同步方式, 将其应用于传输速率为2.5 Gbit·s-1的大气激光通信脉冲位置调制(PPM)系统中, 论述了该帧同步的工作原理, 并分析了其同步性能。采用特定帧头同步序列提高了系统对大气信道帧同步的容错能力, 在信道状态变差时通过适当减小检测阈值可保持较高的同步概率。理论及仿真结果表明, 该同步方案可在高速PPM光通信中实现帧同步, 对应于大气信道3种不同的情形, 检测阈值分别取14、7~9、10~13时可使系统保持较好的工作性能。
光通信 脉冲位置调制 帧同步 阈值可变 中国激光
2017, 44(11): 1106008
Author Affiliations
Abstract
1 Key Laboratory of Advanced Micro-Structure Materials, Ministry of Education, Shanghai 200092, China
2 Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
Nested multilayer mirrors are commonly used in X ray telescope structure to increase the collecting area. To balance the difficulty and cost of producing these mirrors, Wolter-I structures are replaced with conical Wolter-I structures, but these can lead to significantly poorer angular resolutions. In this Letter, we consider changing one of the mirror shapes (paraboloid or hyperboloid) of a Wolter-I structure to a conical mirror shape, while the other mirror shape remains a quadric surface-type structure, which can thus ensure the imaging quality. The cone-hyperboloid structure is nested to obtain on-axis angular resolution and off-axis images.
220.2740 Geometric optical design 350.1260 Astronomical optics Chinese Optics Letters
2016, 14(12): 123401
Author Affiliations
Abstract
1 University of Chinese Academy of Sciences, Beijing 100049, China
2 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Jilin 130033, China
An aggregated channel model is achieved by fitting the Weibull distribution, which includes the effects of atmospheric attenuation, M distributed atmospheric turbulence and nonzero boresight pointing errors. With this approximate channel model, the bit error rate (BER) and the ergodic capacity of free-space optical (FSO) communication systems utilizing subcarrier binary phase-shift keying (BPSK) modulation are analyzed, respectively. A closed-form expression of BER is derived by using the generalized Gauss-Lagueree quadrature rule, and the bounds of ergodic capacity are discussed. Monte Carlo simulation is provided to confirm the validity of the BER expressions and the bounds of ergodic capacity.
光电子快报（英文版）
2016, 12(3): 221
