基于声光可调谐滤波器的光谱成像系统  

Spectral imaging system based on acousto-optic tunable filter

作　　者：廖捷 曾议 宋润泽 周海金 江宇 常振 钱园园 司福祺 LIAO Jie;ZENG Yi;SONG Runze;ZHOU Haijin;JIANG Yu;CHANG Zhen;QIAO Yuanyuan;SI Fuqi(Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所,中国科学院环境光学与技术重点实验室,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026

出　　处：《大气与环境光学学报》2025年第1期104-113,共10页Journal of Atmospheric and Environmental Optics

基　　金：国家重点研发计划(2023YFC3705104)。

摘　　要：设计并搭建了一套基于声光可调谐滤波器(AOTF)的光谱成像系统,该系统主要由前置成像镜头、AOTF、中继转像物镜、CCD相机、AOTF射频驱动器以及上位机组成。系统通过对AOTF的衍射光进行波长扫描,并利用CCD相机进行光谱图像采集,最终生成光谱图像立方体。该系统应用于400~700nm波段范围,光谱分辨率优于1nm,无扫描机械结构,实现了图谱合一。利用此系统进行了外场成像实验,经过0级光干扰抑制方法处理后的成像结果清晰可辨。进一步利用该系统对给定浓度在3.62×1017~1.21×1019molecule/cm2之间的不同NO2样气进行了测量,使用差分吸收光谱算法对所测光谱数据进行反演处理,得到NO2样气的测量浓度,并对测量值与给定值的误差和相关性作出了分析,其误差均在20%范围内,且相关系数为0.99401,表明二者具有良好的相关性,验证了该系统应用于污染气体测量方面的可行性。A spectral imaging system based on acousto-optic tunable filter(AOTF)was designed and built.The system consists of a front imaging lens,an AOTF,a relay objective,a CCD camera,an AOTF radio frequency driver,and a host computer.It can scan the wavelength of diffracted light from AOTF,and collects spectral images using a CCD camera,ultimately generating a spectral image cube.The system can be applied in the range of 400–700 nm,with spectral resolution better than 1 nm,and it has no scanning mechanical structure and realizes the integration of image and spectrum.Field imaging experiments were carried out using this system,and the imaging result after being processed using the suppression method for 0-order light interference were clear and recognizable.Furthermore,the system was used to measure different NO2 sample gases with given concentrations from 3.62×1017–1.21×1019 molecule/cm2.The measured spectral data were retrieved by differential absorption spectrum algorithm to obtain the measured concentrations of NO2 sample gases.The error and correlation between the measured values and the given values were analyzed.It is shown that the errors are within 20%and the correlation coefficient of 0.99401,indicating a good correlation between the measured values and the given values,which verifies the feasibility of the system in pollution gas measurement.

关 键 词：声光可调谐滤波器 光谱成像系统 光谱分辨率 

分 类 号：O433.1[机械工程—光学工程]