仪器分辨率对氧气A带被动测距的影响分析  

The Effect of Instrument Resolution on Passive Ranging of Oxygen A Band

作　　者：李晋华[1,2] 张敏娟[1,2] 王志斌[1,2] 李世中 LI Jin-hua;ZHANG Min-juan;WANG Zhi-bin;LI Shi-zhong(Engineering Technology Research Center of Shanxi Province for Opto-Electronic Information and Instrument,North University of China,Taiyuan 030051,China;North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学,山西省光电信息与仪器工程技术研究中心,山西太原030051 [2]中北大学前沿交叉科学研究院,山西太原030051

出　　处：《光谱学与光谱分析》2022年第6期1974-1978,共5页Spectroscopy and Spectral Analysis

基　　金：山西省面上自然基金项目(201901D111145)资助。

摘　　要：透过率的计算是红外目标被动测距技术的核心,其精度直接影响到被测距离的精度,而仪器分辨率又直接影响到光谱信号的精度。为了研究光谱仪器分辨率对带平均透过率的影响,选用氧气A带为研究对象,采用基线拟合方式计算被测目标的带平均透过率,利用随机Malkmus模型计算被测目标距离,从而获得仪器分辨率对被动测距的影响。为此,搭建了被动测距实验系统,通过对卤素灯光源在不同距离的光谱测量,验证仪器分辨率对带平均模式被动测距的影响。首先,介绍氧气A带透过率的计算方法,计算理论值;以卤素灯为光源,利用光谱仪分别测量相同距离不同分辨率的光谱曲线,计算实测大气透过率,分析光谱分辨率对单谱线的影响;然后,在分析比较透过率模型和实测透过率谱线的基础上,对透过率计算模型进行拟合、校正,验证光谱分辨率对带模型的影响。对于单条谱线,仪器的不同分辨率可测得的谱线区别较大,而对带平均谱线,相同波数点的光谱信号取平均,获得平均效应,使得被测谱线几乎没有变化;分辨率的模型选择需根据不同的应用场合、不同的精度要求选择合适的分辨率。实验结果表明:分辨率对单谱线的透过率影响较大,随着分辨率的降低,被捕获的光谱信息点取值越少,被测目标距离相关系数越小;分辨率对带平均透过率的计算影响较小,不同分辨率下测得的目标距离,几乎重合;而仪器分辨率越高则测量时间越长,当使用带平均透过率计算被测目标距离,在精度要求范围内,可以适当降低仪器分辨率,从而极大地提高测量速度,并达到测量实时性,同时降低系统搭建的成本。该结论可为透过率测量的应用提供依据。The calculation of transmittance is the core of infrared target passive ranging technology,the accuracy of the measured distance is directly affected by accuracy,while the instrument’s resolution directly affects the precision of the spectral signal.In order to study the influence of spectral resolution for transmittance,the calculation method of transmittance and the influence factors of the instrument function in the passive ranging system are analyzed.The experimental system is set up to verify the influence of instrument resolution on passive ranging.Firstly,the calculation method of oxygen A band transmittance is introduced,and the theoretical value is calculated.With a halogen lamp as the light source,the spectral curve under different resolutions was measured by the spectrometer at a certain distance,and the measured atmospheric transmittance was calculated.Then,based on the analysis and comparison of the transmittance model and measured transmittance spectrum,the calculation model was fitted and corrected.For a single spectral line,the measured spectral lines with a different resolution of the instrument differ greatly,while for the spectral line with an average point,the spectral signal with the same wave point is averaged to obtain the average effect so that the measured spectral line almost does not change.Specific resolution model selection should be based on different applications,different precision requirements to choose the appropriate resolution.The experimental results show that resolution greatly influences on the transmittance of a single spectral line.With the decrease of resolution,the less the value of captured spectral information points is,the smaller the correlation coefficient of measured target distance will be.The resolution has little effect on the calculation of the average band transmittance,and the measured target distances under different resolutions almost coincide.The higher the instrument’s resolution is,the longer the measurement time will be.When the average transmittanc

关 键 词：仪器分辨率 氧气A带 透过率 被动测距 曲线拟合 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术]