本文選題：汽車排放檢測 + CO��； 參考：《東北林業(yè)大學(xué)》2015年碩士論文

【摘要】：汽車的快速增長和普遍應(yīng)用,給人們的生活和生產(chǎn)帶來便利的同時,其排放的污染物也給我們賴以生存的環(huán)境造成嚴(yán)重的污染。要做好汽車排放污染物的監(jiān)控與防治,首先必須嚴(yán)格做好汽車排放檢測工作,禁止不達(dá)標(biāo)的汽車上路行駛。我國從1981年就根據(jù)我國的工業(yè)水平和國情開始著手制定相應(yīng)的排放法規(guī),隨著我國工業(yè)水平的不斷提高,出臺的排放法規(guī)越來越嚴(yán)格,對有害的排放物的限值要求越來越低。這樣,就需要高效、可靠、檢測下限越來越小和精度越來越高的檢測技術(shù)與方法。石英增強(qiáng)光聲光譜法(QEPAS)在氣體檢測方面具有靈敏度高、免疫外界干擾強(qiáng)、探測下限低、動態(tài)測量范圍大和響應(yīng)與入射光的波長無關(guān)等優(yōu)點。采用QEPAS對汽車排放的CO檢測,將為汽車排放檢測提供新的思路和方法。本文以氣體分子紅外吸收理論為基礎(chǔ),選擇汽車排放的CO為待測氣體,找出與其它氣體吸收峰無交叉干擾的吸收譜線。對石英音叉參數(shù)和石英增強(qiáng)光聲光譜理論進(jìn)行分析,采用波長調(diào)制法和諧波檢測法,提高系統(tǒng)的信噪比和精度。利用Matlab軟件模擬QEPAS檢測汽車C0排放量,為試驗奠定理論基礎(chǔ)。在石英增強(qiáng)光聲光譜理論分析的基礎(chǔ)上設(shè)計和構(gòu)建QEPAS汽車CO排放檢測系統(tǒng)；選用可調(diào)諧DFB激光器及準(zhǔn)直聚焦光路作為系統(tǒng)的光路部分；使用石英音叉和共振管作為系統(tǒng)的氣路主要部分；采用前置放大器、電子控制單元和計算機(jī)組成系統(tǒng)電路部分。對QEPAS汽車CO排放檢測系統(tǒng)激光器的波長和功率隨溫度及電流變化進(jìn)行測試,并對調(diào)制參數(shù)進(jìn)行選擇；采用波長調(diào)制法對其進(jìn)行標(biāo)定,并對其檢測下限、重復(fù)性和穩(wěn)定性進(jìn)行測試；結(jié)合國家標(biāo)準(zhǔn)GB 18285-2005《點燃式發(fā)動機(jī)汽車排氣污染物排放限值及測量方法(雙怠速法及簡易工況法)》對汽車CO排放量進(jìn)行檢測,并將檢測結(jié)果與尾氣分析儀測量結(jié)果進(jìn)行比較。
[Abstract]:The rapid growth and widespread application of automobiles bring convenience to people's life and production, and at the same time, the pollutants emitted by them also cause serious pollution to the environment on which we rely for survival. In order to monitor and control the emission of pollutants, the first step is to strictly monitor the emission of vehicles and prohibit vehicles that do not meet the standards required for running on the road. China began to formulate corresponding emission regulations according to the industrial level and national conditions of our country in 1981. With the continuous improvement of industrial level in China, the emission regulations are becoming more and more strict, and the limit requirements for harmful emissions are becoming lower and lower. In this way, the detection techniques and methods with high efficiency, reliability, lower detection limit and higher precision are needed. Quartz enhanced photoacoustic spectroscopy (QEPAS) has the advantages of high sensitivity, strong immunity to external interference, low detection limit, large dynamic measurement range and independent response to the wavelength of incident light in gas detection. The application of QEPAS to CO detection of automobile emissions will provide new ideas and methods for vehicle emission detection. Based on the infrared absorption theory of gas molecules, the CO emitted from automobile is selected as the gas to be measured, and the absorption spectrum without cross interference with other gas absorption peaks is found. The parameters of quartz tuning fork and the theory of quartz enhanced photoacoustic spectrum are analyzed. The signal-to-noise ratio (SNR) and accuracy of the system are improved by wavelength modulation method and harmonic detection method. The Matlab software is used to simulate QEPAS to detect the C _ 0 emission of automobile, which lays a theoretical foundation for the test. Based on the theoretical analysis of quartz enhanced photoacoustic spectroscopy, the QEPAS vehicle CO emission detection system is designed and constructed, and the tunable DFB laser and collimated focusing light path are selected as the optical path of the system. Quartz tuning fork and resonance tube are used as the main part of the system, and the preamplifier, electronic control unit and computer are used to make up the circuit of the system. The wavelength and power of the QEPAS vehicle CO emission detection system laser are measured with temperature and current, and the modulation parameters are selected, the wavelength modulation method is used to calibrate the laser, and the detection limit is measured. Repeatability and stability are tested, combined with the national standard GB18285-2005 < limit value and measurement method of exhaust pollutant emission from ignition engine (double idling method and simple working condition method) > to detect automobile CO emission, The test results were compared with those measured by tail gas analyzer.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X831

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