本文選題：光譜學(xué) + 單線法　； 參考：《光學(xué)學(xué)報(bào)》2017年09期

【摘要】：可調(diào)諧二極管激光吸收光譜技術(shù)一般采用雙線法同時(shí)測(cè)量氣體的溫度和物質(zhì)的量分?jǐn)?shù)。然而在頻分和時(shí)分復(fù)用這兩種方式下,雙線法易存在頻率串?dāng)_和降低時(shí)間分辨率等問題,在實(shí)際應(yīng)用中有一定的局限性。針對(duì)此問題,提出了基于波長(zhǎng)調(diào)制光譜技術(shù)的免標(biāo)定單線測(cè)量法,只用一條吸收譜線即可實(shí)現(xiàn)對(duì)氣體溫度和物質(zhì)的量分?jǐn)?shù)的同時(shí)測(cè)量。以燃燒過程中的主要產(chǎn)物CO_2為目標(biāo)氣體,選擇中心頻率為5007.787cm-1的吸收譜線R(50)進(jìn)行實(shí)驗(yàn)驗(yàn)證。從扣除背景的峰值歸一化二次諧波信號(hào)的線型中提取溫度信息,再利用扣除背景的一次諧波歸一化二次諧波信號(hào)提取CO_2的物質(zhì)的量分?jǐn)?shù)。實(shí)驗(yàn)結(jié)果表明,免標(biāo)定單線法與熱電偶測(cè)量的溫度最大相對(duì)偏差小于2.5%,物質(zhì)的量分?jǐn)?shù)的最大相對(duì)偏差小于2.8%。驗(yàn)證了用免標(biāo)定單線測(cè)量法同時(shí)測(cè)量CO_2的溫度和物質(zhì)的量分?jǐn)?shù)是可行的。
[Abstract]:Tunable diode laser absorption spectroscopy is usually used to measure the temperature and mass fraction of gas simultaneously. However, in the two ways of frequency division and time division multiplexing, the problems of frequency crosstalk and time resolution reduction are easy to exist in the two-wire method, which has some limitations in practical application. In order to solve this problem, a single line measurement method based on wavelength modulation spectroscopy is proposed, in which the temperature and mass fraction of gas can be measured simultaneously with only one absorption line. CO_2, the main product of the combustion process, was chosen as the target gas, and the absorption line R _ (50) with the center frequency of 5007.787cm-1 was selected for experimental verification. The temperature information is extracted from the linear form of the normalized second harmonic signal with the peak value of the subtraction background, and the quantity fraction of the substance of CO_2 is extracted by using the normalized second harmonic signal of the subtraction background. The experimental results show that the maximum relative deviation of temperature is less than 2.5 and the maximum relative deviation of mass fraction is less than 2.8. It is proved that it is feasible to measure the temperature and mass fraction of CO_2 simultaneously by using the method of free calibration single line measurement.
【作者單位】： 東南大學(xué)能源與環(huán)境學(xué)院;
【基金】：國家重大科學(xué)儀器設(shè)備開發(fā)專項(xiàng)(2014YQ06053701) 國家自然科學(xué)基金(50976024);國家自然科學(xué)基金青年科學(xué)基金(50906013)
【分類號(hào)】：O433

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本文編號(hào)：1899830