一种共用线阵探测器的双M型C-T光谱仪  

Optical Spectrometer Design of Combined Unfolded Czerny-Turner Spectrometer Sharing One Common Linear-array Detector

作　　者：郭磐 邓延宝 王立福 陈思颖 檀望舒 张寅超 孙雨婷 张嘉忆 杨文慧 陈和 GUO Pan;DENG Yanbao;WANG Lifu;CHEN Siying;TAN Wangshu;ZHANG Yinchao;SUN Yuting;ZHANG Jiayi;YANG Wenhui;CHEN He(MOE Key Laboratory of Optoelectronic Imaging Technology and System,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;State Key Laboratory of Pathogen and Biosecurity,Institute of Microbiology and Epidemiology,Academy of Military Medical Sciences,Academy of Military Sciences,Beijing 100071,China)

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081 [2]军事科学院军事医学研究院微生物流行病研究所病原微生物与生物安全国家重点实验室,北京100071

出　　处：《光子学报》2022年第6期38-47,共10页Acta Photonica Sinica

基　　金：中国博士后科学基金(No.2020M680369)。

摘　　要：现有的切尼特纳光谱仪实现双波段或多波段探测时往往结构复杂,设计成本高,而以线阵探测器接收信号的光谱仪又很少用于多波段探测。本文在传统的切尼特纳光谱仪的基础上,设计了一种共用线阵探测器的双M型切尼特纳光谱仪,用于双激光诱导荧光光谱的探测。该光谱仪采用线阵光电倍增管作为探测器,可以实现280~460 nm和380~560 nm两个波段光谱的快速探测。采用发散光照射光栅的方法校正像面光斑在色散方向上的宽度,从而实现对光谱仪像散的控制。利用光学设计软件对系统光路结构进行仿真优化,对系统的线色散率和RMS光斑进行理论分析,并在原理样机中进行了实验验证。结果表明,两个波段平均光谱分辨率分别为5.84 nm、6.15 nm。本文提出的光谱仪不仅适用于双激光诱导荧光光谱应用,在其他双通道光谱探测领域中也具有很大的应用前景。Czerny-Turner spectrometer has been found for widespread application in the detection of Raman,fluorescence,and atmospheric remote sensing because of its simple structure and high resolution.The conventional Czerny-Turner configuration also known as unfolded C-T spectrometer,consists of two concave mirrors where the light path has no folded part.It can detect a wide range of light,so it is very suitable for dual-band detection.Dual-band spectral detection is mostly used for dual-channel spectral detection systems in the visible infrared band,dual-wavelength-excitation particle fluorescence spectrometer.However,for dual-band or multi-band detection,the spectrometer based on the Czerny-Turner structure often needs to be deformed,and the detector is always selected as area array detectors and detectors even need more than one.It makes the structure of the system more complex and increases the cost.Considering that linear array detectors are more beneficial than planar array detectors for the detection of one-dimensional spectral information,and linear array photomultiplier tube has higher detection efficiency for weak signals and has been verified for effectiveness in the dual-laser-induced fluorescence detection system.We proposed a modified optical design of a combined unfolded Czerny-Turner Spectrometer sharing one common linear-array detector.In the proposed design,the astigmatism of the system is controlled by using divergent illumination on the grating without introducing any additional optical elements,which is used for the correction of astigmatism in the Czerny-Turner spectrometer.By considering the condition of sharing one detector and the astigmatism correction method of the illuminating grating,the proposed design method of the system is provided,and the proposed design method of the system is provided.Zemax is used for simulation and optimization of the proposed optical system model.The spectrometer can detect two bands of light i.e.,280~460 nm and 380~560 nm.We have also analyzed the reciprocal linear

关 键 词：光学设计 切尼特纳光谱仪 双波段探测 激光诱导荧光 光电倍增管 

分 类 号：O433.1[机械工程—光学工程] TH744.1[理学—光学]