基于镜像源方法抑制混响干扰的声全息算法改进

针对实际厂房、机舱等封闭环境中,声全息成像受混响因素严重干扰的问题,在等效源近场声全息方法的基础上,采用房间脉冲响应代替自由空间格林函数建立传递函数,并利用压缩感知技术处理求解时的欠定问题,得到相对准确的等效源强度,以消除混响的干扰,提高声源定位的效果。通过初步的数值模拟,验证了方法的准确性和有效性。结果表明,与原算法相比,改进方法在混响环境中的声源定位具有明显的优势。     

基于Unity 3D的PLC立体仓储仿真系统研究

在教学环节中因缺少实验设备,智能仓储相关课程实践程度不够会导致教学效果差.我们使用Unity 3D虚拟引擎,进行仓储物流环节的三维建模与仿真,开发一款运行简便、注重动手实操的PLC立体仓储仿真教学系统.该系统使用威纶通触控屏实现出入库控制,西门子S7-1200PLC根据触控屏指令控制仓储出入库动作,Unity 3D立体...     

基于笔划的立体图像风格化

为实现双目图像的风格化渲染,提出了一套完整的基于笔划的立体图像风格化系统。首先,将笔划基于颜色梯度和深度梯度确定左视图初始笔划的位置;然后,通过求解由视差约束和位置约束构成的能量优化方程,决定笔划的控制点在左、右眼视图中的最终位置,以保持笔划在两视图中的匹配。系统可以采用不同的笔划属性,生成不同风格的立体图像风格化结果。实验结果表明,所提方法为立体图像的风格化提供了有效快捷的方法。     

位相全场检测的全息网格法

在全息干涉术与光栅网格法耦合的基础上，提出了一种基于位相全场检测的全息网格法．它可用来直接测量固体表面的应变分量（εｘ，εｙ，εｘｙ），其应变测量灵敏度为８×１０－５，利用相移技术得到了光栅栅线图象的位相场，进而确定了光栅的栅距和倾角，结合变形理论实现对应变分量的直接测量．     

基于数字全息的图像置乱的研究

基于用数字全息对图像进行置乱及复原的基本原理,提出了一种基于数字全息的图像置乱方法,并通过实验证明了本方法的置乱和复原效果．     

后向泵浦波变化的简并四波混频

本文对简并四波混频过程中后向泵浦波变化的耦合方程进行了严格的求解,并给出了有意义的讨论,这对于实时全息和信息处理有着重要的意义。     

Orthogonal spherical wave source boundary point method and its application to acoustic holography

When solving acoustic radiation problem in the routine boundary point method (BPM), the inverse of the particular solution matrix of surface normal velocities is needed and the matrix must be full rank and reversible. However, the type of the particular solution sources is single and the sources are not linear independent, so the locations of the particular solution sources inside the vibrating body must be selected carefully. But, in the routine BPM, the loca-tions are determined by an experiential formula, so the method may be invalid for a complicated vibrating body. In this paper, the construction method of the particular solution sources is improved first, and the singular value decomposition (SVD) technique and the Moore-Penrose pseudoinverse are adopted to realize the inversion. As a consequence, the particular solution matrix of surface normal velocities can be non-full rank and the locations of the particular sources can be determined easily. On the basis of the improved BPM, the spherical wave sources of different orders are proposed to be the particular solution sources. Here, all particular solution sources are located on only one point inside the vibrating body, so the problem of the locations of the particular solution sources is thoroughly solved, and such particular solution sources that are useless for the calculation results are discarded. The theoretical model is established at first, and then the proposed method is used to realize the nearfield acoustic holography (NAH). Subsequently, an experiment is investigated to validate the feasibility and correctness of the proposed method and its application to acoustic holography.     

一步法合成多狭缝彩虹消色像全息术

本文提出同一步法拍摄合成多狭缝虹全息消色像全自图，在两次曝光之间物体和透镜沿垂直光轴方向移动一个微小距离，文中进行了分析，给出了实验结果。     

彩虹消色像全息术

本文提出用拍摄无狭缝彩虹全息的方法记录多狭缝彩虹全息消色像，用白光再现的消色像，图像分辨率高，视场范围宽。     

北京市土地利用立体发展探析

充分利用空、时、光热条件,建立多种生物共处与多层次配置的立体发展方略,既可提高土地利用率和产出率,也可大大缓解北京市人多地少的矛盾。