光子学报, 2014, 43 (8): 0823006, 网络出版: 2014-09-01
三种不同结构的无透镜鬼成像实验研究
Lensless Ghost Imaging Experiments in Three Different Configurations
无透镜鬼成像 赝热光源 二阶关联计算 透射成像 反射成像 Lensless ghost imaging Pseudothermal light source Second-order correlation Transmissive imaging Reflective imaging
摘要
为实现远距情况下的实际应用, 对赝热源鬼成像进行了从透射到反射的实验研究.首先利用CCD的两个独立区域分别探测参考光和信号光, 得到双缝的透射型鬼成像, 继而利用一个CCD和一个独立的桶探测器分别探测参考臂和物臂的光强信息, 通过对没有空间分布的物臂光强和没有经过物体而有空间分布的参考臂光强信号进行关联计算实现透射和反射鬼成像.为设计和研制能进行现场应用的样机系统, 以透射结构为例, 对成像结果与系统各参数之间的关系进行了详细的对比实验研究, 结果表明通过增加采样率、增大光强、适当调节快门时间和光阑大小可以提高成像的分辨率和可见度.
Abstract
To achieve stand-off sensing applications,ghost imaging experiments with pseudothermal light were performed from transmissive to reflective cases.First, ghost images of a transmissive double-slit aperture were retrieved in a setup that both the reference beam and signal beam were collected with two different regions of a single CCD.Then a CCD and a separate bucket detector were used to record the light intensity information of the reference beam and the signal beam,respectively.By calculating the intensity correlation function of the signal beam with no spatial light distribution and the spatial dependent reference beam that does not interact with the object,ghost images of a transmissive object and a reflective object were achieved.In order to design and develop prototype systems field applicable,detailed experimental investigations were performed to compare the effect of system parameters on the quality of imaging in the transmission configuration.The results show that enough high power of light source,large sample numbers,and proper exposure time and spatial frequency bandwidth can lead to ghost image with good resolution and visibility.
薛玉郎, 万仁刚, 冯飞, 姚银萍, 张同意. 三种不同结构的无透镜鬼成像实验研究[J]. 光子学报, 2014, 43(8): 0823006. XUE Yu-lang, WAN Ren-gang, FENG Fei, YAO Yin-ping, ZHANG Tong-yi. Lensless Ghost Imaging Experiments in Three Different Configurations[J]. ACTA PHOTONICA SINICA, 2014, 43(8): 0823006.