發(fā)布時(shí)間：2018-05-02 18:03

  本文選題：可調(diào)諧激光吸收光譜技術(shù) + �；瘹怏w泄露　； 參考：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：本文由硫化氫氣體傳感器研制引入多種痕量危險(xiǎn)氣體泄露檢測,所研制的硫化氫傳感器模型同樣適用于甲硫醇、甲硫醚、氨氣、甲烷等多種痕量危險(xiǎn)氣體泄露檢測,只需更換相應(yīng)激光器及光電探測器即可。硫化氫是一種高劇毒、致命性惡臭污染氣體;由于低濃度時(shí)具有臭雞蛋氣味被人們熟知。其主要來源是作為天然氣及石油提純所得副產(chǎn)物,同時(shí)存在于停滯水池、動物排泄物或廢棄煤堆中,對其濃度檢測對于石油礦井安全開采具有重要意義。硫化氫同時(shí)可以作為一種制備氫氣的原料,這樣既可以去除一種有毒氣體又能夠生產(chǎn)一種能源氣體。此外,硫化氫對于許多生理或病理性疾病的治療起到至關(guān)重要作用。因此,痕量硫化氫氣體濃度檢測對于環(huán)境監(jiān)測、安全生產(chǎn)、生物化學(xué)和醫(yī)學(xué)領(lǐng)域有著重要意義。本文以痕量硫化氫氣體檢測為背景對氣體濃度檢測方法及意義進(jìn)行了介紹。通過自行研制的激光硫化氫氣體檢測傳感器,引入一種新型應(yīng)用于痕量危險(xiǎn)氣體泄露在線監(jiān)測方法。全文主要對于免校準(zhǔn)波長調(diào)制光譜技術(shù)及自行研制的硫化氫氣體傳感器軟件、硬件及傳感器性能評價(jià)進(jìn)行介紹。文章主要工作包括如下幾個(gè)部分:(1)通過HITRAN數(shù)據(jù)庫仿真,確定1578.128nm波長處為硫化氫避免空氣中二氧化碳及水分子頻譜混疊干擾的最強(qiáng)特征吸收峰。據(jù)此,選定中心發(fā)射波長為1578nm分布反饋式(Distributedfeedback)激光器作為激光源。同時(shí)選定其他主要硬件設(shè)備:·數(shù)字鎖相放大器、激光器控制器、InGaAs光電探測器、自制氣體標(biāo)定池、離軸拋物面鏡、角反射鏡等,基于氣體流量計(jì)自制一種可配置所需濃度比的設(shè)備(氣體分割器)。(2)對于已建立硬件系統(tǒng)進(jìn)行Lab View上位機(jī)波形數(shù)據(jù)顯示程序編寫、下位機(jī)Arm及FPGA程序編寫,以及迪文DGUS觸摸屏界面設(shè)計(jì)及程序編寫。(3)利用氣體分割器向氣體標(biāo)定池中通入不同濃度硫化氫標(biāo)準(zhǔn)氣體完成對于建立硫化氫傳感器標(biāo)定。同時(shí)對該傳感器線性度、響應(yīng)時(shí)間、穩(wěn)定性及檢測限進(jìn)行了評價(jià)。
[Abstract]:This paper introduces a variety of trace dangerous gas leakage detection by hydrogen sulfide gas sensor. The developed hydrogen sulfide sensor model is also suitable for the detection of trace dangerous gas leakage, such as methyl mercaptan, methyl sulfide, ammonia, methane, and other trace dangerous gases, such as methyl mercaptan, methyl sulfide, ammonia, methane, etc. Only need to replace the corresponding laser and photodetector. Hydrogen sulfide (H2S) is a highly toxic, deadly odor pollutant, known for its low concentration of rotten eggs. The main source is as the by-product of natural gas and oil purification, and it also exists in stagnant pool, animal excreta or waste coal heap. The detection of its concentration is of great significance for the safe exploitation of petroleum mines. Hydrogen sulfide can also be used as a raw material to produce hydrogen, which can not only remove a toxic gas but also produce an energy gas. In addition, hydrogen sulfide plays a critical role in the treatment of many physiological or pathological diseases. Therefore, the detection of trace hydrogen sulfide concentration is of great significance in environmental monitoring, safety production, biochemistry and medicine. Based on the detection of trace hydrogen sulfide gas, the method and significance of gas concentration detection are introduced in this paper. A new on-line monitoring method for trace dangerous gas leakage is introduced by using the laser hydrogen sulfide gas detection sensor developed by ourselves. This paper mainly introduces the technology of non-calibrated wavelength modulation spectrum and the software, hardware and performance evaluation of hydrogen sulfide gas sensor developed by ourselves. The main work of this paper includes the following parts: 1) through HITRAN database simulation, we determine that 1578.128nm wavelength is the strongest characteristic absorption peak of hydrogen sulfide to avoid the interference of CO2 and water spectrum aliasing in the air. Based on this, the 1578nm distributed feedback laser is selected as the laser source. At the same time, other main hardware equipments are selected: digital phase-locked amplifier, laser controller InGaAs photodetector, self-made gas calibration cell, off-axis parabolic mirror, angle mirror, etc. Based on the gas Flowmeter, a kind of equipment which can configure the required concentration ratio (gas splitter) is programmed for the Lab View upper computer waveform data display program, the lower computer Arm and FPGA program for the established hardware system. And the interface design and programming of Devon DGUS touch screen. 3) the calibration of hydrogen sulfide sensor is completed by using gas splitter into the gas calibration cell with different concentration hydrogen sulfide standard gas. The linearity, response time, stability and detection limit of the sensor are also evaluated.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP212

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本文編號：1834925