空间外差拉曼光谱仪成像镜头光机热集成分析
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摘要
便携式空间外差拉曼光谱仪集成了光学功能镜头、干涉仪组件,以及探测器和激光器等热辐射器件,因此仪器在使用过程中存在着较为复杂的热环境,环境温度变化导致光学系统性能下降。采用光机热集成分析方法,重点研究了环境温度及热辐射器件对关键器件成像镜头的性能影响。在便携式空间外差拉曼光谱仪光学和结构方案设计的基础上,建立热-结构耦合模型;仿真得到成像功能镜头内镜片的间距和面形的变化,并利用Zernike多项式拟合其变化;将拟合结果代入光学设计软件中进行成像质量评估和分析。结果表明,在使用环境温度(-10℃~40℃)范围内,调制传递函数在光谱仪截止频率76.9lp/mm处对比度均优于0.38,满足便携式空间外差拉曼光谱仪的使用要求。
The portable spatial heterodyne Raman spectrometer integrates optical lens,interferometer,and thermal radiation devices such as detector and laser.Therefore,the spectrometer has a complex thermal environment,and the change of the ambient temperature can lead to the decline of optical system performance.Aiming at this problem,the method of thermal/structural/optical(TSO)integrated analysis was used to study the influence of ambient temperature and thermal radiation devices on the performance of imaging lens.Based on the design of the optical system and mechanical structure of the spectrometer,the thermal-structure coupling model of the lens was established,and the changes of the lens spacing and the surface shape were obtained by simulation surface change imaging lens,the Zernike polynomial was used to fit their changes.Finally,the results were coupled in the optical design software to evaluate and analyze the imaging quality.The analysis results show that,in the working ambient temperature(-10℃~40℃),the design value of the modulation transfer function(MTF)at 76.9 lp/mm is better than 0.38,which meets the requirement of the portable spatial heterodyne Raman spectrometer.
The portable spatial heterodyne Raman spectrometer integrates optical lens,interferometer,and thermal radiation devices such as detector and laser.Therefore,the spectrometer has a complex thermal environment,and the change of the ambient temperature can lead to the decline of optical system performance.Aiming at this problem,the method of thermal/structural/optical(TSO)integrated analysis was used to study the influence of ambient temperature and thermal radiation devices on the performance of imaging lens.Based on the design of the optical system and mechanical structure of the spectrometer,the thermal-structure coupling model of the lens was established,and the changes of the lens spacing and the surface shape were obtained by simulation surface change imaging lens,the Zernike polynomial was used to fit their changes.Finally,the results were coupled in the optical design software to evaluate and analyze the imaging quality.The analysis results show that,in the working ambient temperature(-10℃~40℃),the design value of the modulation transfer function(MTF)at 76.9 lp/mm is better than 0.38,which meets the requirement of the portable spatial heterodyne Raman spectrometer.
引文
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[2]SHAO Shengyu,ZHANG Lin,CAO Bingqing,et al.Present situation and prospect of application research on portable raman spectroscopy scanner[J].Modern Scientific Instruments,2013(1):28-32.邵晟宇,张琳,曹丙庆,等.便携式拉曼光谱仪的应用研究现状及展望[J].现代仪器科学,2013(1):28-32.
[3]AN Yan,LIU Ying,SUN Qiang,et al.Design and development of optical system for portable Raman spectrometer[J].Acta Optica Sinica,2013,33(3):307-313.安岩,刘英,孙强,等.便携式拉曼光谱仪的光学系统设计与研制[J].光学学报,2013,33(3):307-313.
[4]AN Yan.Research on technology of opto-mechanical system of handhelded raman spectrometer[D].Changchun:Changchun Institute of Optics,Fine Mechanics and Physics Chinese Academy Sciences,2014.安岩.手持式拉曼光谱仪光计系统技术研究[D].长春:中国科学院长春光学精密机械与物理研究所,2014.
[5]YE Song,FANG Yonghua,HONG Jin,et al.Experimental study on spatial heterodyne spectroscopy[J].2007,34(5):84-88.叶松,方勇华,洪津,等.空间外差光谱技术实验研究[J].光电工程,2007,34(5):84-88.
[6]GOMER N R,GORDEN C M,LUCEY P,et al.Raman spectroscopy using a spatial heterodyne spectrometer:proof of concept[J].Applied Spectroscopy,2011,65(8):849.
[7]SHI Hailiang,FANG Yonghua,XIONG Wei,et al.Spatial heterodyne spectroscopy and application in atmospheric remote sensing[J].Journal of Atmospheric and Environmental Optics,2010,5(6):464-468.施海亮,方勇华,熊伟,等.空间外差光谱技术及其在大气遥感探测中的应用[J].大气与环境光学学报,2010,5(6):464-468.
[8]HU Guangxiao,XIONG Wei,LUO Haiyan,et al.The research of spatial heterodyne Raman spectroscopy with standoff detection[J].Spectroscopy and Spectral Analysis,2016,37(2):3951-3957.胡广骁,熊伟,罗海燕,等.用于远程探测的空间外差拉曼光谱技术研究[J].光谱学与光谱分析,2016,37(2):3951-3957.
[9]SHI Hailiang,XIONG Wei,LI Zhiwei,et al.Phase error correction of spatial heterodyne spectrometer[J].Acta Optica Sinica,2013,33(3):313-318.施海亮,熊伟,李志伟,等.空间外差光谱仪相位误差修正[J].光学学报,2013,33(3):313-318.
[10]WU Yao,XU Mingming,CHEN Sujuan,et al.Application of thermal/structural/optical integrated analysis to ultraviolet lens of imaging spectrometer[J].Journal of Applied Optics,2016,37(2):262-266.武耀,徐明明,陈素娟,等.光机热集成分析在高光谱成像仪紫外镜头中的应用[J].应用光学,2016,37(2):262-266.
[11]FAN Yue,LIANG Wei,MA Wenli,et al.Thermal design of the optical system in an aerial camera[J].Opto-Electronic Engineering,2013,40(1):52-59.樊越,梁伟,马文礼.航空相机光学系统热控设计[J],光电工程,2013,40(1):52-59.
[12]KEITH B.doyle,VICTOR L.Genberg.Integrated optomechanical analysis[M].2nd edition.Beijing:National Defense Industry Press,2015:52-62.凯斯·B·道尔,维克托·L·基恩伯格.光机集成分析[M].2版.格雷戈里·J·迈克尔斯,连华东,王小勇,徐鹏,译.北京:国防工业出版社,2015:52-62.