本文選題：可調諧半導體激光吸收光譜技術 + 差分吸收光譜技術　； 參考：《東南大學》2016年碩士論文

【摘要】：可調諧半導體激光吸收光譜(TDLAS)技術是一種靈敏度高、時間響應快、非侵入式的氣體檢測技術,在污染氣體的檢測方面具有廣闊的應用前景。差分吸收光譜(DOAS)技術具有結構簡單、精度高、多組分實時檢測等優(yōu)點,廣泛應用于煙氣組分濃度的檢測。由于NO、NH3氣體的吸收光譜在紫外波段會產生交疊,目前采用單一的技術無法實現NO濃度的準確測量。因此,如何綜合利用紫外光譜(基于DOAS技術)和近紅外激光光譜(基于TDLAS技術)的多光譜融合信息,實現多組分氣體濃度的同時測量是當前煙氣測量研究領域的一個熱點。論文圍繞低濃度NH3測量以及NH3對NO濃度測量的干擾問題,開展了全面的理論分析與實驗研究。對已有的TDLAS技術和DOAS技術進行深度解析,提出了基于紫外光譜和近紅外激光光譜的融合模型,完善了多種補償模型中的數據庫,有效的消除了氣體組分間的干擾。本文的主要工作有：將免標定波長調制方法首次應用于NH3氣體濃度測量。a)理論分析了基于免標定波長調制的氣體濃度測量方法,利用測量得到的背景光強來仿真透射光強,采用虛擬數字鎖相和低通濾波器分析測量和仿真的透射光強信號,得到所需的諧波信號。b)建立了NH3氣體濃度實驗測量系統,開展了針對不同濃度NH3氣體濃度測量的實驗研究。實驗結果表明：測量值與標氣值基本吻合,實現了NH3濃度的準確測量。采用DOAS技術實現了NO氣體濃度的測量。a)針對飽和吸收與測量系統分辨率等引起的NO非線性吸收以及溫度對NO吸收截面的影響。研究了不同濃度下分子數密度比與測量濃度的關系,得到NO的非線性補償函數,利用不同溫度下分子數密度比與溫度的關系,獲取溫度干擾補償函數。b)搭建實驗平臺,對NO氣體濃度進行了測量。實驗結果表明采用提出的補償函數可以很好地修正非線性和溫度變化帶來的干擾。提出了基于紫外和近紅外激光光譜的融合模型,有效的消除了氣體組分之間的干擾。a)分析了在不同濃度與溫度下NH3對NO濃度測量的干擾規(guī)律,得到NH3干擾下的補償函數,建立了基于紫外與近紅外激光光譜的融合模型。b)開展了針對NH3和NO混合氣體濃度同時測量的實驗研究。結果表明：使用多光譜融合模型,可以有效的消除NH3對NO濃度測量的影響,實現NH3與NO氣體濃度的同時準確測量。
[Abstract]:Tunable Semiconductor Laser absorption Spectroscopy (TDLAS) is a kind of non-invasive gas detection technology with high sensitivity, fast time response, and has a broad application prospect in the detection of contaminated gases. Differential absorption Spectroscopy (DOAS) technique has the advantages of simple structure, high precision and multicomponent real-time detection, so it is widely used in the detection of smoke component concentration. Since the absorption spectra of NO-NH _ 3 gas overlap in the ultraviolet band, it is not possible to accurately measure the concentration of no by using a single technique. Therefore, how to integrate the multi-spectral fusion information of ultraviolet spectrum (based on DOAS technology) and near-infrared laser spectrum (based on TDLAS technology) to realize the simultaneous measurement of multi-component gas concentration is a hot spot in the field of smoke measurement. In this paper, the theoretical analysis and experimental study of low concentration NH3 measurement and NH3 interference to no concentration measurement are carried out. Based on the deep analysis of the existing TDLAS and DOAS techniques, a fusion model based on ultraviolet spectrum and near infrared laser spectrum is proposed, which improves the database of various compensation models and effectively eliminates the interference between gas components. The main work of this paper is as follows: the method of non-calibrated wavelength modulation is applied to the measurement of NH3 gas concentration for the first time. The method of measuring gas concentration based on non-calibrated wavelength modulation is analyzed for the first time. The background light intensity is used to simulate the transmitted light intensity. Using virtual digital phase-locked and low-pass filter to analyze and simulate the transmitted light intensity signal to get the needed harmonic signal, the experimental measurement system of NH3 gas concentration is established, and the experimental research on the measurement of NH3 gas concentration with different concentrations is carried out. The experimental results show that the measured values are in good agreement with the standard gas values, and the accurate measurement of NH3 concentration is realized. The nonlinear absorption of no caused by saturation absorption and the resolution of measurement system and the effect of temperature on the absorption cross section of no are realized by DOAS technique. The relationship between the molecular number density ratio and the measured concentration at different concentrations is studied, and the nonlinear compensation function of no is obtained. Using the relationship between the molecular number density ratio and the temperature at different temperatures, the compensation function of temperature interference is obtained to build the experimental platform. The concentration of no gas was measured. The experimental results show that the proposed compensation function can be used to correct the nonlinearity and the disturbance caused by temperature change. Based on the fusion model of ultraviolet and near infrared laser spectra, the interference between gas components is effectively eliminated. The interference law of NH3 to no concentration measurement at different concentrations and temperatures is analyzed, and the compensation function under NH3 interference is obtained. Based on the fusion model of ultraviolet and near infrared laser spectra, the experimental study on simultaneous measurement of the concentration of NH3 and no mixtures was carried out. The results show that the multi-spectral fusion model can effectively eliminate the influence of NH3 on the measurement of no concentration and realize the accurate measurement of the concentration of NH3 and no at the same time.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：X831

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