无扫描无透镜柔性光学内窥成像的纤芯误差影响  

Core Error Effects in Scanless and Lensless Flexible Optical Endoscopic Imaging

作　　者：杨浩然 崔钟明 武壮 宋子奇 吴谨 YANG Hao-ran;CUI Zhong-ming;WU Zhuang;SONG Zi-qi;WU Jin(Laser Engineering Technology Research Center,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 100049,China)

机构地区：[1]中国科学院空天信息创新研究院-激光工程技术研究中心,北京100094 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《光学与光电技术》2025年第1期15-25,共11页Optics & Optoelectronic Technology

基　　金：国家自然科学基金(62071452)资助项目。

摘　　要：为了研究基于相干光纤束(Coherent Fiber Bundle,CFB)的无扫描无透镜柔性光学内窥相位成像技术中纤芯误差对成像的影响,针对CFB的传输模式和纤芯长度误差,利用波动光学理论建立了基于CFB的无扫描无透镜柔性光学内窥2D相位成像的理论模型,数学仿真了不同传输模式或纤芯长度误差对成像的影响。结果表明:单模传输和多模传输下的成像分辨率不同,多模传输下具有超衍射极限分辨率的现象。纤芯长度误差对成像影响严重,纤芯长度误差较大时无法成像,纤芯长度误差较小时,成像信噪比降低。对小纤芯长度误差影响的低信噪比模糊图像,可采用维纳滤波,几次迭代后,图像的信噪比均能提升5 d B以上,图像的归一化均方根误差均小于0.5,有效改善了图像质量。因此,在基于CFB的无扫描无透镜柔性光学内窥相位成像系统中,为了实现成像,需要采用单模CFB或在多模CFB中抑制多模实现单模运转。The effects of core error in scanning and lensless flexible optical endoscopic phase imaging based on coherent fiber bundle(CFB)were studied.Utilizing wave optics theory,a theoretical model has been developed for scanless and lensless flexible optical endoscopic 2D phase imaging based on CFB,addressing transmission mode and core length errors in CFB.The results show that the imaging resolution is different between single-mode transmission and multi-mode transmission,and the phenomenon of super diffraction limit resolution exists in multi-mode transmission.Core length error has a serious impact on imaging.When the core length error is large,imaging cannot be done.When the core length error is small,the imaging signal-to-noise ratio decreases.Wiener filter can be used for fuzzy images with low signal-to-noise ratio affected by small core length error.After several iterations,the signal-to-noise ratio of images can be increased by more than5 dB,and the normalized root mean square error of images is less than 0.5,which effectively improves the image quality.Therefore,in order to achieve imaging in the scanless and lensless flexible optical endoscopic phase imaging system based on CFB,it is necessary to either use single-mode CFB or to suppress multi-modes in multi-mode CFB,thereby ensuring single-mode operation.

关 键 词：柔性光学内窥成像 相干光纤束 传输模式 纤芯长度误差 维纳滤波 

分 类 号：O436[机械工程—光学工程]