基于离散频谱校正的差分吸收光谱数据处理方法研究  

Study on Differential Optical Absorption Spectroscopy Data Processing Based on Discrete Spectrum Correction

作　　者：贾桂红 张建军[1] 郑海明[2] JIA Gui-hong;ZHANG Jian-jun;ZHENG Hai-ming(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding,Hebei 071003,China)

机构地区：[1]河北工业大学机械工程学院,天津300401 [2]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《计量学报》2021年第8期1081-1086,共6页Acta Metrologica Sinica

基　　金：国家自然科学基金(11174078);河北省自然科学基金(E2019502089);中央高校基本科研业务费专项资金(2017MS145)。

摘　　要：差分吸收光谱法(DOAS)常利用傅里叶变换滤波法来滤除光谱数据中的噪声,但因其频率分辨率的限制,致其幅值误差较大,从而影响气体的测量精度。提出了一种离散频谱校正的差分吸收光谱数据处理方法,利用离散频谱主瓣内的谱线重心求出峰值的坐标,对幅值误差进行补偿,提高气体的测量精度。对不同浓度的SO_(2)气体进行了浓度反演实验,结果表明:频谱校正法的反演误差小于5%,相对于传统的最小二乘法和傅里叶变换滤波法误差分别减少0.36%和0.88%;在谱线漂移两个采样间隔为0.28 nm时,传统最小二乘法的平均误差为31.8%,频谱校正法的最大误差则为3.8%,效果明显优于前者。The Fourier transform filtering method is used to filter out the noise in the differential optical absorption spectrum(DOAS)data.Due to the limitation of frequency resolution,the amplitude error is large,which affects the detection accuracy of gas.A method that discrete spectrum correction differential optical absorption spectrum data method is proposed,which uses the barycenter of the spectral line in the main lobe of the discrete spectrum to find the coordinate of the peak,and compensates the amplitude error to improve the measurement accuracy of gas.Many groups of SO_(2)gases with different concentrations are measured.The results show that the inversion error of the spectrum correction method is less than 5%,and compared with the traditional least square method and the Fourier transform filtering method,the error is reduced by 0.36%and 0.88%respectively.When the spectral lines are shifted by 2 sampling intervals 0.28 nm,the average error of the traditional least square method is 31.8%,and the maximum error of the spectrum correction method is 3.8%.The latter is obviously superior to the former.

关 键 词：计量学 气体浓度监测 差分吸收光谱法 频谱校正 谱线重心 傅里叶变换 

分 类 号：TB99[一般工业技术—计量学]