本文選題：氣體檢測(cè)　切入點(diǎn)：可調(diào)諧二極管激光器　出處：《長(zhǎng)春理工大學(xué)》2014年碩士論文

【摘要】：可調(diào)諧二極管激光調(diào)制光譜(Tunable Diode Laser Absorption Spectroscopy, TDLAS)技術(shù)目前廣泛應(yīng)用于工業(yè)生產(chǎn)以及環(huán)境污染監(jiān)測(cè)等領(lǐng)域,以其高分辨率、快響應(yīng)度、高靈敏度、低探測(cè)限的優(yōu)勢(shì),在痕量氣體檢測(cè)的應(yīng)用中得到了廣泛的應(yīng)用。隨著各領(lǐng)域?qū)DLAS氣體檢測(cè)技術(shù)的需求逐漸增加,利用Matlab等數(shù)學(xué)軟件來(lái)實(shí)現(xiàn)對(duì)TDLAS技術(shù)的模擬己經(jīng)成為一個(gè)嶄新的科研領(lǐng)域。利用虛擬平臺(tái)對(duì)氣體參量進(jìn)行模擬,并進(jìn)一步分析光學(xué)參量變化對(duì)測(cè)量的影響,會(huì)更好的描述TDLAS技術(shù)中的每個(gè)步驟,以便為相關(guān)實(shí)驗(yàn)提供參數(shù)設(shè)置的參考,更可以作為衡量TDLAS氣體檢測(cè)系統(tǒng)信噪特性的方法,使TDLAS技術(shù)在實(shí)際應(yīng)用過(guò)程中更具可行性。利用Matlab軟件編程實(shí)現(xiàn)了TDLAS氣體檢測(cè)系統(tǒng)的仿真模擬,為其在痕量氣體檢測(cè)的應(yīng)用中打下了堅(jiān)實(shí)的理論基礎(chǔ)。 氣體吸收信號(hào)的模擬是基于Lambert-Beer吸收定律,利用Matlab編程模擬出氣體直接吸收信號(hào),其中氣體吸收線所需的光譜信息是通過(guò)HITRAN數(shù)據(jù)庫(kù)獲取的。通過(guò)Matlab軟件的仿真,建立起了基于可調(diào)諧二極管激光器的光譜氣體檢測(cè)系統(tǒng)的仿真模型。該仿真模型包括兩部分：基礎(chǔ)原理仿真部分和調(diào)制系數(shù)調(diào)節(jié)仿真部分,基礎(chǔ)原理仿真部分主要為直接吸收光譜、調(diào)制吸收信號(hào)光譜和諧波提取圖。調(diào)制系數(shù)部分是對(duì)理想模型的各系數(shù)進(jìn)行調(diào)制,通過(guò)分析其變化得出參數(shù)范圍。并通過(guò)對(duì)比仿真結(jié)果與預(yù)設(shè)值來(lái)驗(yàn)證仿真效果,調(diào)制系數(shù)的模擬工作是基于TDLAS氣體檢測(cè)技術(shù)的基本原理,推導(dǎo)出了TDLAS氣體檢測(cè)技術(shù)的諧波分量。 本文利用Matlab編程實(shí)現(xiàn)了對(duì)直接吸收信號(hào)的調(diào)制和解調(diào)的模擬,最后通過(guò)實(shí)驗(yàn)對(duì)二次諧波幅度隨調(diào)制系數(shù)變化進(jìn)行驗(yàn)證,實(shí)驗(yàn)測(cè)量的結(jié)果與模擬結(jié)果基本一致,驗(yàn)證了對(duì)系統(tǒng)的模擬仿真。
[Abstract]:Tunable Diode Laser Absorption spectroscopy (TDLAS) technology is widely used in industrial production and environmental pollution monitoring, due to its advantages of high resolution, fast response, high sensitivity and low detection limit.It has been widely used in trace gas detection.With the increasing demand for TDLAS gas detection technology in various fields, it has become a new research field to use Matlab and other mathematical software to realize the simulation of TDLAS technology.Using the virtual platform to simulate the gas parameters and further analyze the influence of the optical parameters on the measurement will better describe each step in the TDLAS technology in order to provide a reference for the related experiments.It can also be used as a method to measure the signal-noise characteristics of TDLAS gas detection system and make the TDLAS technology more feasible in practical application.The simulation of TDLAS gas detection system is realized by using Matlab software, which lays a solid theoretical foundation for its application in trace gas detection.The simulation of the gas absorption signal is based on the Lambert-Beer absorption law. The direct gas absorption signal is simulated by Matlab programming. The spectral information required by the gas absorption line is obtained through the HITRAN database.The simulation model of spectral gas detection system based on tunable diode laser is established by the simulation of Matlab software.The simulation model consists of two parts: the basic principle simulation part and the modulation coefficient adjustment simulation part. The basic principle simulation part mainly consists of direct absorption spectrum, modulation absorption signal spectrum and harmonic extraction diagram.The modulation coefficient part modulates each coefficient of the ideal model and obtains the parameter range by analyzing its variation.The simulation result is verified by comparing the simulation result with the preset value. The simulation of modulation coefficient is based on the basic principle of TDLAS gas detection technology and the harmonic component of TDLAS gas detection technology is deduced.In this paper, the modulation and demodulation of the direct absorption signal is simulated by Matlab programming. Finally, the change of the amplitude of the second harmonic with the modulation coefficient is verified by experiments. The experimental results are basically consistent with the simulation results.The simulation of the system is verified.
【學(xué)位授予單位】：長(zhǎng)春理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP274;TN911.3

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