基于相干光纤束的无扫描无透镜3D内窥成像方法  

Scanless and Lensless 3D Endoscopic Imaging Through Coherent Fiber Bundle

作　　者：吴童 柯佳仪 宋子奇 默迪 吴谨 Wu Tong;Ke Jiayi;Song Ziqi;Mo Di;Wu Jin(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学电子电气与通信工程学院,北京100094

出　　处：《光学学报》2021年第18期100-109,共10页Acta Optica Sinica

基　　金：国家自然科学基金(62071452)。

摘　　要：提出一种基于相干光纤束(CFB)的无扫描、无透镜3D内窥成像方法。与传统内窥成像方法相比,该方法以裸光纤束端面为探头,无需集成任何微光机元件,结构简单,体积小,极易微型化。该方法融合了合成孔径激光雷达(SAL)、宽带线性调频激光雷达和数字全息激光雷达等,利用宽带线性调频激光器产生主动照明信号,并采用CFB收集、传输目标散射回波,同时根据离轴数字全息原理通过使用高速CCD阵列相机记录回波信号,最后利用SAL数据处理方法重构目标3D图像。建立了3D内窥成像系统的数学模型,给出了3D内窥成像的数据处理方法。理论和仿真结果表明,所提方法克服了光纤束固有结构造成的像素化图像伪影,具有精确的横向和纵向3D成像感知能力。A scanless and lensless 3 D endoscopic imaging method based on a coherent fiber bundle(CFB)is proposed.Compared with conventional endoscopic imaging method,the proposed method uses the end face of a bare fiber bundle as a probe and does not require integrating any low-light-level mechanical components.Therefore,the proposed method provides a simple structure,small volume,and easy miniaturization.Moreover,it combines synthetic aperture lidar(SAL),broadband linear frequency-modulated lidar,and digital holographic lidar.A broadband linear frequency-modulated laser generated an active illumination signal,and the CFB collected and transmitted the scattering echo of a target.Simultaneously,based on off-axis digital holography,a high-speed CCD array camera recorded the echo signal.Finally,SAL data processing method is used to reconstructed a 3 D image of the target.The mathematical model of the 3 D endoscopic imaging system is established,and the corresponding data processing method is detailed.Theoretical and simulation results show that the proposed method overcomes image pixilation caused by the inherent structure of the CFB and has the ability of precise transversal and longitudinal 3 D imaging perceptions.

关 键 词：成像系统 图像探测系统 3D内窥成像 合成孔径激光雷达 离轴数字全息 

分 类 号：O436[机械工程—光学工程]