本文選題：大氣光學(xué) + 腔衰蕩光譜技術(shù)��； 參考：《光學(xué)學(xué)報(bào)》2017年09期

【摘要】：采用高溫?zé)峤馕逖趸?N_2O_5)的方法,利用N_2O_5與NO_3自由基之間的熱平衡關(guān)系,通過腔衰蕩光譜技術(shù)測量N_2O_5及NO_3自由基的濃度。基于二氧化氮(NO_2)與N_2O_5之間平衡可逆,探討加熱溫度及NO_2濃度變化對N_2O_5分解率的影響;考慮N_2O_5在測量系統(tǒng)中的損耗,經(jīng)初步的量化分析得到進(jìn)氣效率為88%。通過Allan方差選取最佳積分時(shí)間,在外場測量條件下,優(yōu)化系統(tǒng)的體積分?jǐn)?shù)探測限為8.6×10-12;通過分析進(jìn)氣效率、吸收截面及N_2O_5不完全熱解等不確定性因素,估算得到整體測量誤差約為±10%。在合肥郊區(qū)進(jìn)行夜間大氣實(shí)際監(jiān)測,測量期間N_2O_5的濃度變化范圍在(0.035~1)×10-9之間,平均濃度為4.52×10-10。該技術(shù)為實(shí)現(xiàn)大氣中N_2O_5及NO_3自由基的高靈敏度在線監(jiān)測提供了有效途徑。
[Abstract]:By using the method of high temperature pyrolysis of N _ 2O _ 5) and using the thermal equilibrium relationship between the Ns _ 2O _ 5 and the no _ 3 free radicals, the concentration of the N _ 2O _ 5 and no _ 3 free radicals was measured by cavity decay spectroscopy. Based on the reversibility of the equilibrium between NSCN _ 2O _ 2) and NSP _ 2O _ 5, the effect of the change of heating temperature and no _ 2 concentration on the decomposition rate of N _ 2O _ 5 is discussed, considering the loss of N _ 2O _ 5 in the measuring system, the intake air efficiency is 88% by preliminary quantitative analysis. The detection limit of volume fraction of the optimized system is 8.6 脳 10 ~ (-12) under the condition of external field measurement by selecting the best integral time through Allan variance. The uncertainty factors such as intake efficiency, absorption section and incomplete pyrolysis of NSP _ 2O _ 5 are analyzed. The whole measurement error is estimated to be 鹵10. During the measurement period, the concentration of N2O5 varies from 0.035 to 1) 脳 10 ~ (-9), with an average concentration of 4.52 脳 10 ~ (-10). This technique provides an effective way to realize the high sensitivity on-line monitoring of NSCT _ 5 and no _ 3 free radicals in the atmosphere.
【作者單位】： 中國科學(xué)院安徽光學(xué)精密機(jī)械研究所中國科學(xué)院環(huán)境光學(xué)與技術(shù)重點(diǎn)實(shí)驗(yàn)室;安徽工業(yè)大學(xué)數(shù)理科學(xué)與工程學(xué)院;安徽醫(yī)科大學(xué)藥學(xué)院;
【基金】：國家自然科學(xué)基金(61570206,61675006,11474003) 中國科學(xué)院環(huán)境光學(xué)與技術(shù)重點(diǎn)實(shí)驗(yàn)室開放基金(2015DP173065-2016-03) 安徽省自然科學(xué)基金(1608085MF133,1408085MA19) 安徽省高校優(yōu)秀青年人才支持計(jì)劃(gxyqZD2016065)
【分類號】：O433;P412
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本文編號：1984148