光子计数成像系统的自适应累积时间扫描方法  

Adaptive acquisition time scanning method for photon counting imaging system

作　　者：朱文华 汪书潮 王凯迪 陈松懋 马彩文[1,2] 苏秀琴 Zhu Wen-Hua;Wang Shu-Chao;Wang Kai-Di;Chen Song-Mao;Ma Cai-Wen;Su Xiu-Qin(Key Laboratory of Space Precision Measurement Technology,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China;Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China)

机构地区：[1]中国科学院西安光学精密机械研究所,中国科学院空间精密测量技术重点实验室,西安710119 [2]中国科学院大学,北京100049 [3]青岛海洋科学与技术试点国家实验室,青岛266237

出　　处：《物理学报》2022年第15期314-322,共9页Acta Physica Sinica

基　　金：中国博士后科学基金(批准号:2020M683600);中国科学院战略高技术创新项目(批准号:GQRC-19-19)资助的课题。

摘　　要：得益于单光子探测器的超高灵敏度,光子计数成像系统近年来成为极弱光探测成像领域的研究热点.基于单点扫描的光子计数成像系统,以光子累积的方式获取大量返回光子事件后重建目标图像.然而,单像素探测时间固定导致的光子事件累积冗余或累积不足的问题,限制了系统的成像效率.本文提出了一种基于自动选取单像素最佳累积时间的时间自适应扫描方法,并分别进行了单点测距和扫描成像实验.结果表明,本文提出的方法在重建质量接近的深度图像(64×88)时的数据总获取时间相比单像素固定累积时间的扫描方法降低了一个数量级,极大地提高了扫描数据获取的效率,为光子计数成像系统快速成像提供了新思路.Photon counting imaging system has recently received a lot of attention in ultra-weak light detection.It has high sensitivity and temporal resolution.The single-point scanning photon counting imaging system typically accumulates a large number of photon events to reconstruct depth image.Acquisition time is redundant or insufficient,which limits imaging efficiency.In this work,a new method called adaptive acquisition time scanning method(AATSM) is proposed to solve this dilemma.Comparing with the fixed acquisition time of every pixel,the method can automatically select the acquisition time of per pixel to reduce total time of data collecting while obtaining depth images.In experiment,we acquire the depth images with the same quality by different scanning methods,showing the feasibility of AATSM.The total time of collecting data by the AATSM can be reduced to 11.87%,compared with fixed acquisition time of every pixel.This demonstrates the capability of speed scanning of AATSM,which can be used for the fast imaging of photon counting system.

关 键 词：光子计数 累积 自适应扫描 

分 类 号：TN256[电子电信—物理电子学]