光电工程2014年第41卷 总目次

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Statistical models combined with the local plasma frequency approach applied to the atomic electron density are employed to study the photoionization cross-section for complex atoms. It is demonstrated that the Thomas–Fermi atom provides surprisingly good
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研究了电磁感应透明介质中高阶非线性效应对光孤子传输的影响。采用半经典理论获得介质对光场的线性和非线性响应,基于介质特性利用波动理论推演出三-五阶非线性薛定谔方程。介质的线性非线性特性分别决定了群速度色散参量,三阶和五阶非线性系数。研究结果表明,该非线性介质既可以诱导亮孤子也可以诱导暗孤子,取决于群速度色散参量和三阶非线性系数。当前者为负同时后者为正时产生亮孤子,当两者均为负时产生暗孤子,二者可以通过载频与相应跃迁能级失谐的调节获得。与普通非线性薛定谔方程相比,三-五阶非线性薛定谔方程对亮孤子和暗孤子出现的
Polarization-dependent gain (PDG) and state of polarization (SOP) of the output signal light in Yb^(3 -) doped fiber amplifiers are studied by numerically stimulation, which showed that PDG of output signal light is not only changed with the input pump po
Elastic lidar observations of profiles of the aerosol extinction, backscattering coefficients, and the lidar ratio have been performed in Beijing. The elastic lidar transmitts wavelengths of 532 and 355 nm. The measurement altitude can reach up to 6 km. T
An investigation of the cluster size dependence of the maximum energy of protons ejected from explosion of methane clusters in an intense femtosecond laser field has been conducted on the basis of the cluster size estimation by Rayleigh scattering measure
精确结构光模型是三维光学测量的前提,其中分布式空间测量定位系统的交会模型是以线结构激光面的理想平面模型为基础的。而大尺度空间下的线结构激光面存在复杂变形,且很难用任何数学模型来精确拟合。因此,研究了一种基于高精度转台的线结构激光面非参数模型标定方法,建立了激光面旋转时间与空间角度间的精密映射表,替代了曲面拟合参数模型,并在激光面非参数标定的结果基础上对交会模型进行了优化。以室内空间测量定位系统为验证平台,实验结果表明该标定方法能够有效克服激光面复杂变形问题,可将12 m测量范围内变形较为明显区域的坐标测量
本文首次报道了环形激光弱磁传感器(RLMS)的原理和实验结果,在采用20mm长的铽玻璃作为法拉第元件时,获得了2.9×10~(-5)Oe/Hz(0.0023Amp/m·Hz)的灵敏度和9.hrs内随机漂移≯2.3Hz的稳定性.
针对多尺度目标检测问题,提出一种基于深度注意力机制的多尺度红外行人检测方法。首先,选取较为轻量级的Darknet53作为深度卷积特征提取的主干网络,设计四尺度的特征金字塔网络负责目标的定位和分类,通过引入更低层高分辨率的特征图来改善对小尺度行人目标的检测性能。其次,利用注意力模块替代特征金字塔网络中传统的上采样模块,生成基于卷积特征的局部显著图,可以有效抑制不相关区域的特征响应,突出图像局部特性。
Oil microleakage can cause the land surface vegetation to be abnormal. An oil and gas exploration method based on the vegetation information in the hyperspectral remote sensing images is proposed. It's used to probe the effectiveness of extracting the oi