基于单光子阵列探测器的隐藏目标瞬时成像理论研究

Study of theory for transient imaging of hidden object using single-photon array detector

传统的成像技术受限于固体介质（例如墙壁）的遮挡，不能对不可见的物体进行成像。而且在传统成像中光速被认为是无限大的，所以传统成像过程是一个固态光传输的过程，与光的飞行时间无关，不能展现光传输中物体的具体特征。单光子成像是一种能够检测到非常微弱的光子信号、并能同步采集物体的距离、强度和图像信息的技术。文中介绍了一种对隐藏目标进行瞬态成像的方法，在成像过程中，将光子飞行时间作为光传输过程中的变量，将遮挡目标成像与光子计数相结合，以单光子阵列探测器作为接收器，重建隐藏物体，并通过仿真来验证了此方法。文中提供了基于单光子阵列探测器的隐藏目标瞬态成像的基本理论和框架，可以更好地理解隐藏目标瞬态成像的性质，并有助于未来设计在现实世界中的成像系统。

Traditional imaging limits to the occlusion of the solid medium such as the wall and can not collect the image of the object which is out of sight. Moreover, the speed of light is supposed to be infinite in traditional imaging, so the imaging process is a steady-state light transport and irrelevant to the time of flight of light, which cannot reveal the specific characteristic of object in the light transport. Single-photon imaging is a technology which can detect very weak photon signal and capture the information of distance, intensity and image of objects synchronously. In this paper, a method of transient imaging for hidden object was introduced. In the imaging process, the time of flight of photon was considered as a variable in light transport to realize transient imaging, combining imaging for hidden object with photon counting and using single-photon array detector as a receiver to reconstruct hidden object. Further, this method was demonstrated by simulation. It provides the basic theory and framework for the transient imaging of hidden object using single-photon array detector, which can help to design the imaging system in real world in the future, as well as to achieve a better understanding of the nature of transient imaging for hidden object.