用热弹性理论系统地分析了凝聚态物质的光声喇曼效应,分别导出了连续和脉冲激光泵浦下的光声喇曼信号表达式,并做了数值估算.
We investigate the dynamic crystallization processes of colloidal photonic crystals, which are potentially invaluable for solving a number of existing and emerging technical problems in regards to controlled fabrication of crystals, such as size normaliza
本文报导了用激光扫描系统直接绘制计算全息滤波器的研制情况及初步实验结果。该系统采用Burckhardt编码方式能直接绘制出约为10×10mm~2的计算全息图,每一采样孔为10×20μ~2,全息图的空间带宽积可达1024×512,每一采样元有7bit灰阶,总信息容量为6×10~7,绘制时间为17分钟.
将压缩传感理论与偏折角修正迭代技术相结合解决光偏折层析极少方向的投影重建,提出了一种新的偏折角压缩传感修正重建算法。该算法以待测场梯度的l1 范数为稀疏性先验模型,结合最速下降法进行全变差调整,并引入压缩传感权重因子对迭代过程进行优化。在极少方向投影条件下对双峰温度场进行模拟重建,并在相同条件下与已有算法进行比较。结果表明,在6 方向投影数据条件下,新算法在峰值构建和重建平滑度方面均表现出显著的优越性,新算法的峰值误差和标准距离误差分别比现有算法降低了18.32%和46.67%。通过对喷焰温度分布的实验测
为解决现有电子式像移补偿在扫描方向上补偿范围有限的问题,提出一种适用于沿扫描方向广域像移大小变化的数字时间延迟积分(TDI)方法。首先基于像移计算结果判断像移大小是否在电子行频可补偿的范围内,当在不可补偿范围时,基于利用图像插值和配准像素对位累加来调整像移失配量的思想,构建任意像移大小的数字TDI算法模型,并对所提算法进行实验验证。实验结果表明:当96级积分的总像移量远小于像元尺寸时,所提算法与逐
Changing illumination condition can change the result of image segmentation algorithm and reduce the intelligent recognition rate. A novel color image segmentation method robust to illumination variations is presented. The method is applied to the skin se
As the key part for energy amplification of high-power laser systems, disk amplifiers must work in an extremely clean environment. Different from the traditional cleanliness control scheme of active intake and passive exhaust (AIPE), a new method of activ
The process of high energy electron acceleration along the surface of grating targets (GTs) that were irradiated by a relativistic, high-contrast laser pulse at an intensity