本文選題：光譜學(xué) + 調(diào)諧二極管激光吸收光譜��； 參考：《天津大學(xué)》2012年博士論文

【摘要】：調(diào)諧二極管激光吸收光譜(Tunable Diode Laser Absorption Spectroscopy, TDLAS)是通過對(duì)二極管激光器施加調(diào)諧信號(hào)實(shí)現(xiàn)波長掃描,獲得氣態(tài)物質(zhì)吸收譜線從而推算其成分和狀態(tài)信息的檢測(cè)技術(shù),廣泛應(yīng)用于工業(yè)及環(huán)境領(lǐng)域的氣體檢測(cè)中。 本論文以對(duì)TDLAS技術(shù)檢測(cè)性能的提高和檢測(cè)范圍的擴(kuò)展提供技術(shù)支撐為研究目的,針對(duì)TDLAS技術(shù)系統(tǒng)優(yōu)化和信號(hào)處理開展關(guān)鍵技術(shù)研究,包括系統(tǒng)參數(shù)優(yōu)化、數(shù)據(jù)處理流程、波長對(duì)應(yīng)過程以及應(yīng)用技術(shù)中的計(jì)算方法。主要的工作內(nèi)容包括以下四個(gè)方面: 1、系統(tǒng)參數(shù)優(yōu)化:基于TDLAS的調(diào)制理論,對(duì)調(diào)制參數(shù)和鎖相參數(shù)在系統(tǒng)運(yùn)行中的功能和影響信號(hào)的機(jī)理進(jìn)行研究。根據(jù)檢測(cè)需求提取信號(hào)特征值,通過實(shí)驗(yàn)觀察各參數(shù)變化對(duì)信號(hào)特征值的影響,總結(jié)影響規(guī)律,以此為基礎(chǔ)給出系統(tǒng)在濃度和壓強(qiáng)檢測(cè)中各參數(shù)優(yōu)化的依據(jù)和方法。對(duì)鎖相放大器時(shí)間常數(shù)與調(diào)制參數(shù)聯(lián)合影響信號(hào)進(jìn)行實(shí)驗(yàn)觀察及分析,給出在不同情況下參數(shù)選擇依據(jù)和應(yīng)注意的問題。 2、數(shù)據(jù)處理流程:討論并驗(yàn)證TDLAS數(shù)據(jù)處理流程中各步驟的作用,針對(duì)不同信號(hào)觀察處理效果。將溫度調(diào)諧數(shù)據(jù)與電流調(diào)諧數(shù)據(jù)進(jìn)行比較,采用數(shù)值計(jì)算方法和信號(hào)處理手段對(duì)不利于后期處理的特征加以改進(jìn),使其在形式構(gòu)成和波長對(duì)應(yīng)過程上與電流調(diào)諧方法一致。在特征值提取過程中,采用相鄰極值點(diǎn)求差分柱的算法簡化提取流程,評(píng)價(jià)處理結(jié)果,論證其在數(shù)據(jù)處理和讀取過程中的優(yōu)點(diǎn)以及與其他匹配檢索技術(shù)結(jié)合的可能性。在吸收峰臨近或重疊的情況下,以線型公式二階導(dǎo)數(shù)疊加的形式擬合曲線,得到各吸收峰的數(shù)值信息。 3、波長對(duì)應(yīng)過程:分析波長對(duì)應(yīng)過程在壓強(qiáng)檢測(cè)中的重要性,結(jié)合激光器的靜態(tài)調(diào)諧特性,研究了信號(hào)采樣點(diǎn)在對(duì)應(yīng)波長過程中的誤差來源。在波長計(jì)算方式上,根據(jù)激光器工作原理,用查找對(duì)應(yīng)二次擬合曲線的方法得到采樣點(diǎn)對(duì)應(yīng)的波長值,消除了調(diào)諧非線性對(duì)線形檢測(cè)造成的影響。分別研究調(diào)制幅度和掃描頻率對(duì)實(shí)際發(fā)射波長的影響機(jī)理,此為基礎(chǔ)對(duì)檢測(cè)信號(hào)進(jìn)行了調(diào)制幅度校正和掃描頻率校正,消除了不同調(diào)制參數(shù)下檢測(cè)信號(hào)波長序列之間的差異,保證了信號(hào)的線形檢測(cè)精度。 4、應(yīng)用技術(shù)中的計(jì)算方法:在之前工作的基礎(chǔ)上,對(duì)TDLAS系統(tǒng)的實(shí)際應(yīng)用進(jìn)行探索,針對(duì)不同需求,應(yīng)用不同調(diào)諧方式和處理流程分別進(jìn)行單一組分濃度檢測(cè)、多組分氣體檢測(cè)、壓強(qiáng)測(cè)量和長光程大氣監(jiān)測(cè)等實(shí)驗(yàn)。選擇適當(dāng)?shù)姆治鍪侄魏蛿M合方法對(duì)待測(cè)值進(jìn)行計(jì)算,得到一套TDLAS系統(tǒng)實(shí)際應(yīng)用的計(jì)算方式和優(yōu)化過程,對(duì)此技術(shù)今后的應(yīng)用發(fā)展起到指導(dǎo)作用。
[Abstract]:Tunable Diode Laser Absorption spectroscopy (TDLAS) is a technique for detecting the composition and state information of gaseous matter by applying tuning signal to the diode laser to realize wavelength scanning and to obtain the absorption line of gaseous substance. It is widely used in gas detection in industrial and environmental fields. The purpose of this thesis is to provide technical support for the improvement of TDLAS detection performance and the expansion of detection range. The key technologies of TDLAS system optimization and signal processing are studied, including system parameter optimization, data processing flow. Wavelength correspondence process and calculation method in application technology. The main areas of work include the following four areas: 1. System parameter optimization: based on the modulation theory of TDLAS, the function of modulation parameter and phase-locked parameter in system operation and the mechanism of affecting signal are studied. The characteristic value of signal is extracted according to the demand of detection. The influence of the change of parameters on the characteristic value of signal is observed experimentally, and the influence law is summarized. Based on this, the basis and method of optimizing the parameters of the system in the detection of concentration and pressure are given. The experimental observation and analysis of the combined effects of the time constant and modulation parameters of the phase-locked amplifier are carried out, and the basis for the selection of the parameters under different conditions and the problems to be paid attention to are given. 2, data processing flow: discuss and verify the function of each step in TDLAS data processing process, observe the effect of different signal processing. Comparing the temperature tuning data with the current tuning data, the numerical calculation method and the signal processing method are used to improve the characteristics which are not conducive to the later processing, so that the temperature tuning data are consistent with the current tuning method in the form composition and the wavelength correspondence process. In the process of feature extraction, the extraction process is simplified by using the algorithm of finding difference columns with adjacent extremum points, the processing results are evaluated, and its advantages in the process of data processing and reading are demonstrated, as well as the possibility of combining with other matching retrieval techniques. When the absorption peak is near or overlapping, the curve is fitted in the form of superposition of the second derivative of linear formula, and the numerical information of each absorption peak is obtained. 3, wavelength correspondence process: the importance of wavelength correspondence process in pressure detection is analyzed, and the error source of signal sampling point in the corresponding wavelength process is studied according to the static tuning characteristics of laser. In terms of wavelength calculation, according to the working principle of the laser, the corresponding wavelength values of the sampling points are obtained by searching the corresponding quadratic fitting curve, which eliminates the influence of tuning nonlinearity on the linear shape detection. The influence mechanism of modulation amplitude and scanning frequency on the actual emission wavelength is studied respectively. Based on this, the modulation amplitude correction and scanning frequency correction are carried out to eliminate the difference between the detection signal wavelength sequences under different modulation parameters. The linear detection accuracy of the signal is guaranteed. 4. Calculation methods in application technology: on the basis of previous work, the practical application of TDLAS system is explored. According to different requirements, single component concentration detection and multicomponent gas detection are carried out according to different tuning methods and processing flow. Pressure measurement and long-path atmospheric monitoring experiments. A set of calculation method and optimization process for practical application of TDLAS system are obtained by selecting appropriate analytical means and fitting method to calculate the measured values, which will play a guiding role in the development of this technology in the future.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2012
【分類號(hào)】：R318.51

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