一种用于手持拉曼的宽谱段高分辨分光系统设计  

Design of spectroscopic system with high-resolution and wide-spectrum for handheld Raman spectrometer

作　　者：赵迎 曹海霞 王超[3] 沈学静[1,2] 李小佳 ZHAO Ying;CAO Haixiao;WANG Chao;SHEN Xuejing;LI Xiaojia(Central Iron and Steel Research Institute,Beijing 100081,China;NCS Testing Technology Co.,Ltd.,Research Institute,Beijing 100094,China;Institute of Space Electro Techology,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]钢铁研究总院,北京100081 [2]钢研纳克检测技术股份有限公司研究院,北京100094 [3]长春理工大学空间光电技术研究所,长春130012

出　　处：《光学技术》2022年第6期641-646,共6页Optical Technique

基　　金：国家重点研发计划项目(2018YFF01012000)。

摘　　要：针对目前手持拉曼的微型光谱仪的光谱范围较窄,光谱分辨率较差,体积较大等技术短板,提出一种用于手持拉曼的宽谱段高分辨分光系统设计方法。在综合考虑安装调试及性能基础上,创新性采用楔形柱面镜消除像散,既保证了信号强度又便于机械安装。在约束不同波长经过光栅衍射后,出射光束口径变化的前提下,利用交叉式非对称Czerny-Turner光路结构的像差特性,实现全谱范围内的慧差矫正。基于ZEMAX软件对光谱仪结构进行仿真和优化,并完成了样机研制,样机尺寸为72mm×43mm×62mm。采用氦-氖灯对其性能进行了测试,结果表明:分辨率优于6cm^(-1)、拉曼光谱范围150~4000cm^(-1),验证了该微型光谱仪系统光学设计的可行性和合理性。Aiming at the technical shortcomings of the current handheld Raman micro spectrometer,such as narrow spectral range,poor spectral resolution and large volume,a design method of the spectroscopic system for the handheld Raman spectrometer with high-resolution and wide-spectrum was proposed.On the basis of the comprehensive consideration of installation,debugging and performance,the wedge-shape cylindrical mirror was innovatively used to eliminate the astigmatism,which not only ensured the signal strength,but also facilitated the mechanical installation.Under the premise of restricting the change of the outgoing beam aperture after grating diffraction at different wavelengths,the aberration characteristics of the crossed asymmetric Czerny Turner optical path structure was used to achieve the coma correction in the full spectrum range.Based on the ZEMAX software,the spectrometer structure was simulated and optimized,and the prototype was developed.The size of the prototype was 72 mm×43 mm×62 mm.The performance was tested by the helium-neon lamp.The results showed that the resolution was better than 6 cm^(-1) and the Raman spectral range was 150~4000 cm^(-1),which verified the feasibility and rationality of the optical design of the micro-spectrometer system.

关 键 词：光谱仪 光学设计 交叉式非对称Czerny-Turner结构 拉曼 

分 类 号：O436[机械工程—光学工程]