基于数字微镜的大气透射仪校准光源的光谱模拟方法  

Spectral Simulation Method for Calibrating Light Source of Transmission Visibility Meter Based on Digital Micromirror

作　　者：孙继亮 张国玉[1,2,3] 张健 徐达[1,2,3] 梁婧 运志坤[1] 杨晓彤[1] Sun Jiliang;Zhang Guoyu;Zhang Jian;Xu Da;Liang Jing;Yun Zhikun;Yang Xiao tong(School of Opto-Electronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;Opto-Electronic Measurement and Control Instrumentation,Jilin Province Engineering Research Center,Changchun 130022,Jilin,China;Key Laboratory of Opto-Electronic Measurement and Optical Information Transmission Technology,Ministry of Education,Changchun 130022,Jilin,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]吉林省光电测控仪器工程技术研究中心,吉林长春130022 [3]光电测控与光信息传输技术教育部重点实验室,吉林长春130022

出　　处：《中国激光》2022年第11期159-169,共11页Chinese Journal of Lasers

基　　金：吉林省科技发展计划(20190302124GX);国家自然科学基金(62075019);长春理工大学科技创新基金(XJJLG-2018-02)。

摘　　要：针对目前大气透射仪校准领域无法溯源到世界气象组织对能见度定义的难题,以及如何实现满足国际民航组织(ICAO)观测要求的2700 K色温光谱模拟问题,本文提出了一种基于数字微镜的大气透射仪校准光源的光谱模拟方法。首先分析了光谱模拟单元的偏态性质,选用Bigaussian、Asym2Sig和ECS三种函数分别作为正偏态、正态以及负偏态分布光谱模拟单元的拟合函数;然后采用Gaussian函数以及Bigaussian、ECS、Asym2Sig三种函数组合进行光谱模拟对比实验,两者的光谱模拟误差分别为33.4%和25.2%,这表明三种函数组合代替Gaussian函数进行光谱模拟具有可行性;之后分析了影响光谱模拟误差的主要因素,提出了一种基于最大模拟误差的光谱修正方法,并在410~460 nm局部波段验证了光谱修正方法的正确性,最终实现了380~780 nm波段范围内2700 K色温光谱模拟误差为6.2%,较修正前整体光谱调制能力提高了4.06倍。Objective The transmission visibility meter(TVM),being the main visibility measurement instrument,is calibrated based on the spectral characteristics of the detection light source,which does not satisfy the 2700 K color temperature light source standard defined by the Meteorological Optical Range(MOR)for visibility,making the instrument unidentifiable with the definition of visibility after calibration.Although the technical basis for 2700 K color temperature simulation is initially available,spectral simulation accuracy is low and it still cannot satisfy the requirements for TVM observation and traceability under the measurement accuracy of the International Civil Aviation Organization(ICAO).To address the current lack of a high-precision simulation method for 2700 K color temperature,this study proposes a spectral simulation method for calibrating the light source of TVM based on a digital micromirror for accurate simulation of the 2700 K color temperature spectrum.It also provides research basis and technical support for TVM calibration and traceability chain establishment that meets the definition of MOR and the standard of ICAO.Methods Forty-nine spectral simulation units are divided using the TVM-calibration light source experimental device.The Gaussian,Bigaussian,Asym2Sig,and ECS functions were used to fit three skew distribution spectral simulation units,based on the measured skewness properties of the spectral simulation unit.Three functions of Bigaussian,Asym2Sig,and ECS are selected as the fitting functions of the positive,normal,and negative skew distribution spectrum simulation units,based on the fitting accuracy.The feasibility of using Bigaussian,ECS,and Asym2Sig functions to replace the Gaussian function for the spectrum simulation experiment is proven using the 2700K color temperature spectrum simulation comparison experiment based on least squares.Three continuous spectral simulation units are selected at the wavelength where the maximum spectral simulation error is covered,and Lighttools softwa

关 键 词：光谱学 大气透射仪 大气能见度 光谱模拟 黑体色温 校准方法 

分 类 号：TH765.83[机械工程—仪器科学与技术]