基于硫系玻璃-聚甲基丙烯酸甲酯分光结构的散斑计算重组光谱仪设计  

Design of speckle calculation recombination spectrometer based on chalcogenide glass-polymethyl methacrylate spectroscopic structure

作　　者：沈文力 谭秋林[1,2] 张磊 谢浩[1,2] Shen Wenli;Tan Qiulin;Zhang Lei;Xie Hao(Science and Technology on Electronic Test&Measurement Laboratory,North University of China,Taiyuan 030051,China;Key Laboratory of Instrumentation Science&Dynamic Measurement,Ministry of Education,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学电子测试技术重点实验室,山西太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《红外与激光工程》2023年第10期158-166,共9页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(52105594,51821003);山西省应用基础研究计划项目(20210302124274);山西省留学回国人员科技活动择优资助项目(20210011);山西省“1331”重点学科建设项目。

摘　　要：传统的台式光谱仪多采用大体积、长光程的色散分光方式,往往只能在实验室使用。而手持式光谱仪多采用可调光学滤波器或傅里叶变换的方法,内部存在精密的移动部件,制造难度大。使用硫系玻璃IG2和聚甲基丙烯酸甲酯(PMMA)材料,研究了这两种材料的均匀随机分布方法,以两种材料折射率变化的差异为基础构筑了无序散射结构,结合散斑计算重组的方法设计了一种量程和分辨率可变的小型红外光谱仪系统,结构简单、稳定,无移动部件,可通过不同波长的标定光来确定该系统的量程和分辨率。利用Tracepro软件,采用不同的光源输入进行了标定,用模拟的黑体辐射作为测试输入,光谱仪系统在1~10.9μm光谱范围内能够实现0.1μm分辨率,在1000~2000 nm光谱范围内能够实现10 nm分辨率。采用六阶多项式对测量结果进行了拟合,拟合曲线的最大相对误差为5.32%,可满足煤矿、食品、药物等多方面的应用。Objective After nearly half a century of development,infrared spectroscopy has been widely used in food,medicine,biological diagnosis,agriculture,textile,oil refining and chemical industries.The optical path of the traditional infrared spectrometer is more complex,and often with moving parts,so the requirement of machining accuracy is very high,and the optical components in the optical path are also expensive.These factors make the infrared spectrometer expensive and the stability,reliability and working environment adaptability of the system weak.Small spectrometers have received extensive attention and developed rapidly due to their significant advantages in size,weight,and power consumption.In particular,computational spectral analysis technology based on speckle detection can obtain high-precision spectral information by recording and analyzing the speckle patterns formed by scattering elements on the measured light.Speckle computational reconstruction spectrometer has the advantages of both small size and high resolution,and because the preparation of scatterers is simpler and costs less than various strictly designed micro-nano structures or materials with different components,it is a spectral analysis technology with great application potential.Methods A set of speckle calculation recombination spectrometer system is designed in this paper.The spectroscopic structure was designed using chalcogenide glass IG2 and polymethyl methacrylate(PMMA)materials.The uniform random distribution method of these two materials was studied.The disordered scattering structure was constructed based on the difference in refractive index changes of the two materials(Fig.3).The spectrometer system was tested by Tracepro software design simulation experiment.Results and Discussions The speckle calculation recombination spectrometer system adopts a special spectroscopic structure.The spectroscopic structure is designed based on the uniform random distribution of chalcogenide glass IG2 and polymethyl methacrylate(PMMA),which can g

关 键 词：光谱仪 分光结构 光学仿真 硫系玻璃 聚甲基丙烯酸甲酯(PMMA) 

分 类 号：TH744.1[机械工程—光学工程]