本文關(guān)鍵詞： 紅外 定量檢測 二階導數(shù)譜 Savitzky-Golay濾波器 特征吸收窗　出處：《光譜學與光譜分析》2017年06期 　論文類型：期刊論文

【摘要】：紅外光譜分析技術(shù)已被液體、固體和氣體混合物各組分的定量檢測廣泛應(yīng)用。針對紅外光譜定量檢測過程中存在的計算過程復雜、受背景及噪聲干擾、多組分譜線混疊的問題,一方面,通過獲取譜線二階導數(shù)去除背景及噪聲干擾,并一定程度上區(qū)分混疊譜峰。在獲取二階導數(shù)譜線過程中運用Savitzky-Golay濾波器進行平滑濾波處理,并根據(jù)譜線頻率特征選取Savitzky-Golay濾波器最佳濾波參數(shù),解決了濾波參數(shù)缺乏標準化選取方法的問題。另一方面,根據(jù)被測組分的吸收分布情況生成特征吸收窗分別對待測原始吸收譜線以及二階導數(shù)譜線加以處理,提取出在濃度計算過程中占據(jù)重要性更大的特征吸收的區(qū)域,從而排除非吸收區(qū)域中背景、噪聲及其他組分對計算結(jié)果的干擾。以一組丙烷、丙烯和甲苯混合氣體為例,運用二階導數(shù)方法以及特征吸收窗方法進行定量檢測,并與直接利用原始譜線的檢測結(jié)果進行比較分析。實驗結(jié)果表明采用二階導數(shù)譜與特征吸收窗的定量檢測方法精度更高,相對誤差基本在5%以內(nèi)。
[Abstract]:Infrared spectrum analysis technology has been widely used in quantitative detection of components of liquid, solid and gas mixtures. In view of the complex calculation process in the process of infrared spectrum quantitative detection, it is interfered by background and noise. On the one hand, the second derivative of spectral lines is obtained to remove background and noise interference. To some extent, the aliasing spectrum peak is distinguished. In the process of obtaining the second derivative spectral line, Savitzky-Golay filter is used to smooth filter. The optimal filter parameters of Savitzky-Golay filter are selected according to the spectral line frequency characteristics, which solves the problem of the lack of standardized selection method of filter parameters. On the other hand. According to the absorption distribution of the tested components, the characteristic absorption window is generated to treat the original absorption line and the second derivative spectrum line respectively. In order to eliminate the interference of background, noise and other components in the non-absorption region, a group of propane was extracted to occupy the more important characteristic absorption region in the calculation of concentration. The second derivative method and the characteristic absorption window method were used for quantitative detection of propylene and toluene mixtures. The experimental results show that the quantitative detection method based on the second derivative spectrum and the characteristic absorption window is more accurate and the relative error is less than 5%.
【作者單位】： 河北工業(yè)大學機械工程學院;天津大學精密測試技術(shù)及儀器國家重點實驗室;天津工業(yè)大學天津市電工電能新技術(shù)重點實驗室;
【基金】：河北省自然科學基金項目(F2014202065) 國家重大科學儀器設(shè)備開發(fā)專項(2012YQ06016501) 國家自然科學基金項目(61505142)資助
【分類號】：O657.33

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