Photoacoustic detection of NO2 and N2O using quantum cascade lasers
Photoacoustic detection of NO2 and N2O using quantum cascade lasers
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DOI：
10.1007/s00340-006-2357-0
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发表时间：
2006-11-01
影响因子：
2.1
通讯作者：
Hess, P.
中科院分区：
文献类型：
--
作者：
Lima, J. P.;Vargas, H.;Hess, P.
采用波长为6.2 μ m和8 μ m的脉冲量子级联激光器（QCLs）和差分光声探测器（PA）测量了环境压力下亚ppmv范围内的NO2和N2O浓度。QCL温度在-40℃~ 30℃之间调节，两种氮氧化物的实测PA振动谱与模拟HITRAN谱吻合良好。在这两种情况下，PA信号与所研究的0.5-50 ppmv区域的浓度呈线性关系。将N2O的测量结果与使用掠入射光学参量振荡器在2.9 μ m处测量的N2O进行了比较。
Pulsed quantum cascade lasers (QCLs) with 6.2-mu m and 8-mu m wavelengths and a differential photoacoustic (PA) detector were used to measure concentrations of NO2 and N2O in the sub-ppmv range at ambient pressure. The QCL temperatures were tuned between -40 degrees C and 30 degrees C. Good agreement was found between measured PA vibrational spectra and simulated HITRAN spectra of both nitrogen oxides. The PA signals showed a linear dependence on the concentration in the investigated 0.5-50 ppmv region in both cases. The results for N2O are compared with a PA measurement of N2O at 2.9 mu m using a grazing-incidence optical parametric oscillator.