本文關(guān)鍵詞： 可調(diào)諧半導(dǎo)體激光器吸收光譜技術(shù)(TDLAS) 多散射介質(zhì)內(nèi)的氣體吸收光譜技術(shù)(GASMAS) 多孔散射介質(zhì)材料 甲烷氣體的吸收光譜測(cè)量　出處：《浙江大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：可調(diào)諧半導(dǎo)體激光器吸收光譜技術(shù)(TDLAS)是一種應(yīng)用廣泛的氣體傳感技術(shù),利用該項(xiàng)技術(shù)對(duì)甲烷氣體的探測(cè)也有了很好的發(fā)展。本課題結(jié)合了TDLAS技術(shù)和散射介質(zhì)內(nèi)的光傳播問題,利用多散射介質(zhì)內(nèi)的氣體吸收光譜技術(shù)(GASMAS)對(duì)甲烷氣體在多孔散射介質(zhì)材料中的吸收問題展開了相應(yīng)的研究。本課題的研究工作包括,使用安置了氧化鋁粉末燒結(jié)制成的散射材料的小型氣室,結(jié)合基于高速數(shù)據(jù)采集卡的輸入輸出控制設(shè)備,搭建一整套結(jié)構(gòu)緊湊的甲烷氣體光學(xué)測(cè)量系統(tǒng),研究了多孔散射介質(zhì)內(nèi)的甲烷氣體的吸收光譜。對(duì)于甲烷氣體的測(cè)量,我們選用了DFB激光器,并且經(jīng)實(shí)驗(yàn)驗(yàn)證,在15℃的工作溫度,60 mA的中心驅(qū)動(dòng)電流的條件下,輸出符合我們預(yù)期的掃過甲烷氣體在近紅外波段吸收峰的,中心波長(zhǎng)為1653.7 nm的激光；采用了幅值為75mV的調(diào)制信號(hào),使計(jì)算得到的二次諧波信號(hào)達(dá)到最優(yōu)化；使用了傅里葉變換結(jié)合Levenberg-Marquardt最優(yōu)化擬合算法對(duì)測(cè)量結(jié)果信號(hào)進(jìn)行后處理及分析�；谏鲜鲅芯�,我們使得實(shí)驗(yàn)測(cè)量系統(tǒng)的線性相關(guān)度達(dá)到0.998,實(shí)驗(yàn)測(cè)量系統(tǒng)的最優(yōu)靈敏度在積分時(shí)長(zhǎng)為120秒時(shí)達(dá)到9.13ppm。而對(duì)于多散射介質(zhì)的甲烷氣體交換特性的研究顯示,本系統(tǒng)的氣體交換過程時(shí)間為13秒左右,表明本測(cè)量系統(tǒng)具有較好的氣體交換特性。
[Abstract]:Tunable semiconductor laser absorption spectroscopy (TDLAS) is a widely used gas sensing technology. The use of this technology to detect methane gas has also made a good development. This subject combines TDLAS technology and light propagation in scattering media. Gas absorption spectroscopy in multi-scattering media is used to study the absorption of methane in porous scattering media. The research work includes. A compact optical measurement system of methane gas was built by using a small gas chamber with scattered material made from alumina powder and an input and output control equipment based on high-speed data acquisition card. The absorption spectrum of methane gas in porous scattering medium is studied. For the measurement of methane gas, DFB laser is selected and verified by experiment, working temperature is 15 鈩，

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