Third-order ghost interference with thermal light

A scheme for third-order ghost interference with thermal light is proposed. The visibility and resolution of the interference fringe related to the bandwidth of the spatial frequency spectrum of the source are analysed. The results show that the visibility of the third-order ghost interference fringe is much higher than that of the second-order one.     

密立根油滴实验中油滴选取的研究

理论分析模拟了油滴下落时间与油滴半径的关系、油滴带电量子数与下落时间和平衡电压的变化关系,理论证实了平衡电压在150～400 V,下落时间在10～30 s附近的油滴为最佳油滴,探索提炼出油滴选取的方法和技巧,为学生理解和完成密立根油滴实验提供帮助。     

信息光学视角下菲涅耳双棱镜干涉的研究

菲涅耳双棱镜干涉在相衬成像和全息显微术中有重要应用。为了促进其应用,本文从信息光学角度研究双棱镜干涉,首先利用光场与脉冲响应函数之间的关系,理论导出了菲涅耳双棱镜干涉条纹强度公式,分析并讨论了狭缝缝宽及狭缝到双棱镜距离对菲涅耳双棱镜干涉条纹的影响,狭缝宽度大于0. 1 mm时,干涉条纹分辨率变差。接着给出了改变狭缝宽度(变化量为0. 08 mm)和改变狭缝到双棱镜的距离(从8 cm变化到12 cm)的实验结果,理论分析和实验结果一致。该结果有助于促进菲涅耳双棱镜干涉在相衬成像等领域的应用。     

风能发电物理实验教学探讨

利用自行研制的风能发电实验仪,在大学物理实验和近代物理实验教学中开设了风能发电实验内容.教学实践表明该内容新颖,学生兴趣浓厚,可方便直观的了解风能转换及利用的全过程.诸多影响风能发电效率的因素给学生留下对风能发电的思考,促进其综合素质的提高.     

Novel Ghost Imaging Method for a Pure Phase Object

We propose a novel ghost imaging scheme which is especially served to a pure phase object. A spatially incoherent beam is mixed with a coherent beam of the same frequency field by a beamsplitter. Then we perform the ghost imaging scheme using the mixed beam. Our theoretical result shows that this approach is capable of reconstructing a pure phase object in joint-intensity measurement. The visibility of the images is also analysed for two pure phase objects, an optical wedge and a phase grating.