红外光纤传像束光学系统目标探测能力分析  

Analysis of Target Detection Capability of Infrared Fiber Image Bundle Optical System

作　　者：刘盛捷 李俊威 陈浩[1,2,3] 王胜千 Liu Shengijie;Li Junwei;Chen Hao;Wang Shengqian(Key Laboratory of Adaptive Optics,Chinese Academy of Sciences,Chengdu 610209,Sichuan,China;National Laboratory on Adaptive Optics,Chengdu 610209,Sichuan,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,Sichuan,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院自适应光学重点实验室,四川成都610209 [2]自适应光学全国重点实验室,四川成都610209 [3]中国科学院光电技术研究所,四川成都610209 [4]中国科学院大学,北京100049

出　　处：《光学学报》2024年第13期105-117,共13页Acta Optica Sinica

基　　金：国家自然科学基金(11873008,62105337);中国科学院西部之光西部青年学者项目。

摘　　要：基于光纤传像束光学系统成像理论,通过分别对信号表达式和噪声表达式进行适当修正,推导了光纤传像束光学系统的目标信噪比公式,并给出了该系统相比传统光学系统的信噪比损耗系数表达式,其可有效表征系统的探测能力。结合所设计的红外光纤传像束光学系统,仿真计算了脉冲可视因子、系统填充因子等关键性能参数,并进一步分析光纤透过率与信噪比损耗系数的关系,定量比较两类光学系统的探测能力差异。该研究为红外光纤传像束光学系统的探测能力边界确定提供理论基础。Objective To meet the imaging requirements of high resolution and large field-of-view, infrared target detection optical systems should utilize complex optical lens groups, which results in large volume, weight, and total system length. As a result, they are not suitable for deployment on optical payload platforms with limited space, such as airborne and spaceborne platforms. The infrared fiber image bundle is soft and easy to bend, and adding this kind of bundle to the traditional optical system can flexibly change the optical path and shorten the overall length of the system. However,infrared fiber image bundle optical systems have the nature of spatially double discrete sampling effect, and their imaging characteristics are different from those of traditional optical systems. This makes the traditional target detection signal-tonoise ratio(SNR) formula applicable to linear space-invariant systems and no longer applicable to infrared fiber image bundle optical systems. To this end, we present an innovative method for quantitatively analyzing the target detection capability of infrared fiber image bundle optical systems. The proposed method adopts statistical analysis to complete the derivation of the target SNR and the SNR attenuation coefficient formulas, featuring clarity, simplicity, and easy calculation. We hope that this method will contribute to the optical design, device selection, and system detection capability analysis of infrared fiber image bundle optical systems.Methods The target detection scenario of infrared fiber bundle optical systems is set to detect distant point targets under a uniform background in the sky. Thus, the signal and noise components are appropriately corrected respectively to obtain the target detection SNR formula of these systems. First, the overall transmittance of infrared fiber bundle optical systems is obtained by combining the product of the fiber transmittance and the fiber bundle filling factor, the transmittance of the front telescopic system, and the transmittance of

关 键 词：红外目标探测 光纤传像束光学系统 脉冲可视因子 目标信噪比 损耗系数 

分 类 号：O439[机械工程—光学工程]