本文選題：光譜學 + 單線法��； 參考：《光學學報》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測量氣體的溫度和物質(zhì)的量分數(shù)。然而在頻分和時分復用這兩種方式下,雙線法易存在頻率串擾和降低時間分辨率等問題,在實際應(yīng)用中有一定的局限性。針對此問題,提出了基于波長調(diào)制光譜技術(shù)的免標定單線測量法,只用一條吸收譜線即可實現(xiàn)對氣體溫度和物質(zhì)的量分數(shù)的同時測量。以燃燒過程中的主要產(chǎn)物CO_2為目標氣體,選擇中心頻率為5007.787cm-1的吸收譜線R(50)進行實驗驗證。從扣除背景的峰值歸一化二次諧波信號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提取CO_2的物質(zhì)的量分數(shù)。實驗結(jié)果表明,免標定單線法與熱電偶測量的溫度最大相對偏差小于2.5%,物質(zhì)的量分數(shù)的最大相對偏差小于2.8%。驗證了用免標定單線測量法同時測量CO_2的溫度和物質(zhì)的量分數(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】： 東南大學能源與環(huán)境學院;
【基金】：國家重大科學儀器設(shè)備開發(fā)專項(2014YQ06053701) 國家自然科學基金(50976024);國家自然科學基金青年科學基金(50906013)
【分類號】：O433

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