Abstract：A long open path fourier transform infrared spectroscopy system is described. The 250-meter-optical-path configuration is combined with a Fourier transform spectrometer of 1 cm-1 resolution. With an active blackbody source, the transmittance spectrum of the atmosphere could be measured by the system. And then, it was fitted with the nonlinear least square algorithm to calculate the average concentrations of the constituents in the path. Measuring result of some gases such as CH4,CO, N2O and CO2 in polluted air was presented in the experiment part and the RMS of the residuals was <1%. The result shows that the system is stable and rapid, and can be easily aligned. It is suitable for research work on some infrared active important atmospheric constituents.
Key words：Long open path;Fourier transform spectroscopy;Trace gas;Quantity analysis
徐亮,刘建国,高闽光,陆亦怀,魏秀丽,张天舒,朱军,陈军. 开放式长光程傅里叶变换红外光谱系统在环境气体分析中的应用[J]. 光谱学与光谱分析, 2007, 27(03): 448-451.
XU Liang,LIU Jian-guo,GAO Min-guang,LU Yi-huai,WEI Xiu-li,ZHANG Tian-shu,ZHU Jun,CHEN Jun . Application of Long Open Path FTIR System in Ambient Air Monitoring. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(03): 448-451.
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