【摘要】：社會進步給我們生活帶來便捷的同時,也對環(huán)境造成了污染,大氣污染是各種污染中重要的一個方面,直接危害人類的生活質(zhì)量及健康。 CH4與CO、CO2和含氯氟烴等是造成大氣溫室效應(yīng)的主要的氣體,CH4對溫室效應(yīng)的作用是同濃度CO2的22倍,所以對CH4的檢測和治理變得非常重要,目前對大氣污染物的檢測廣泛采用可調(diào)諧二極管吸收光譜技術(shù)(TDLAS),對采集到的信號采用數(shù)字信號處理的辦法,具有準(zhǔn)確度高,穩(wěn)定性好等優(yōu)點,本文針對實時監(jiān)測系統(tǒng)的設(shè)計主要進行了以下幾個方面的研究和討論： (1)分析比較氣體檢測的常用方法,對TDLAS技術(shù)的特點和優(yōu)勢作了說明,介紹了數(shù)字信號處理技術(shù)的發(fā)展和應(yīng)用。 (2)描述了實時監(jiān)測系統(tǒng)的原理,主要包括TDLAS技術(shù)中所應(yīng)用到的光譜學(xué)技術(shù)、甲烷吸收線的選擇及波長調(diào)制技術(shù)的原理。 (3)提出了實時監(jiān)測系統(tǒng)硬件電路方面的設(shè)計及實驗器件的選擇,包括信號調(diào)制電路的設(shè)計、光源及其驅(qū)動器的選擇、倍頻電路及鎖相放大電路的設(shè)計,最后簡單介紹了信號處理部分。 (4)對實時監(jiān)測系統(tǒng)的軟件的設(shè)計,包括系統(tǒng)總體軟件的設(shè)計、數(shù)據(jù)采集的軟件設(shè)計、數(shù)據(jù)處理軟件的設(shè)計及仿真。
[Abstract]:Social progress not only brings convenience to our life, but also pollutes the environment. Air pollution is an important aspect of all kinds of pollution. CH4, CO _ 2 and chlorofluorocarbons are the main gases causing atmospheric Greenhouse Effect. CH4 has 22 times more effect on Greenhouse Effect than on the same concentration of CO2. So the detection and treatment of CH4 becomes very important. At present, tunable diode absorption spectroscopy (TDLAS),) is widely used to detect atmospheric pollutants. (TDLAS), adopts the method of digital signal processing for the collected signals, which has high accuracy. In this paper, the design of real-time monitoring system is studied and discussed in the following aspects: (1) the common methods of gas detection are analyzed and compared, and the characteristics and advantages of TDLAS technology are explained. The development and application of digital signal processing technology are introduced. (2) the principle of real-time monitoring system is described, including the spectroscopic technology used in TDLAS technology. The selection of methane absorption line and the principle of wavelength modulation technology. (3) the design of hardware circuit of real-time monitoring system and the selection of experimental devices, including the design of signal modulation circuit, the choice of light source and its driver, The design of frequency-doubling circuit and phase-locked amplifier circuit. Finally, the signal processing part is introduced briefly. (4) the software design of real-time monitoring system, including the design of system software, the software design of data acquisition, Design and simulation of data processing software.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP274;TP368.1

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