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利用离轴腔增强吸收光谱技术探测实际大气中的二氧化碳
作者姓名:Zhao H  Wang GS  Cai TD  Gao XM
作者单位:中国科学院安徽光学精密机械研究所大气物理化学研究室
基金项目:中国科学院重大科研装备项目(YZ200818);国家高技术研究发展计划项目(2009AA06Z204)资助
摘    要:以1.573μm窄线宽可调谐半导体激光器作光源,结合高精细度光学谐振腔的离轴腔增强吸收光谱技术,选择CO2在6 357.311 6cm-1的吸收谱线,对实际大气CO2分子进行了测量。为了得到更准确的有效方程,对谐振腔吸收程长的标定方法进行了研究,给出了一种简单、实用的标定方法。实验结果表明,高精密度光学谐振腔的有效吸收程长为~1 195.73m,测得实际大气CO2的浓度为~388.3ppm(S/N≈22),最小可探测浓度为17.65ppm。将波长调制技术与OA-CEAS技术结合后,最终将CO2分子的最小可探测浓度提高到0.36ppm(S/N≈1 064)。

关 键 词:离轴腔增强吸收光谱  CO2  高精密度光学谐振腔  最小可探测浓度  波长调制

Off-axis cavity enhanced absorption spectroscopy detection techniques for the measurement of carbon dioxide
Zhao H,Wang GS,Cai TD,Gao XM.Off-axis cavity enhanced absorption spectroscopy detection techniques for the measurement of carbon dioxide[J].Spectroscopy and Spectral Analysis,2012,32(1):41-45.
Authors:Zhao Hui  Wang Gui-shi  Cai Ting-dong  Gao Xiao-ming
Institution:Laboratory of Atmosphere Physcis & Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. zhhui08@mail.ustc.edu.cn
Abstract:The spectrum of carbon monoxide was obtained around 1. 573 microm using a tunable distributed feedback semiconductor laser with a high-finesse cavity at room temperature via off-axis cavity enhanced absorption (CEA) spectroscopic technique. The absorption line of carbon monoxide at 6 357. 311 6 cm(-1) was chosen for trace detection. Meanwhile, in order to get more accurate measurements, absorption path length of the cavity calibration methods was studied, and a simple and practical calibration method was given. The results show that, the equivalent absorption path length of high-precision optical resonator was -1 195.73 m. At last, we got the concentration of carbon monoxide in the real atmosphere to be -388.346 ppm (S/N = 22), and the detection limit of carbon monoxide was 17.65 ppm. By combination of wavelength modulation technology and OA-CEAS technology, a minimum detectable concentration of 0.36 ppm (S/N = 1 064) was achieved eventually.
Keywords:Off-axis cavity enhanced absorption spec troscopy  CO2  High-finesse optical resonant cavity  Minimum detectable concentration  Wavelength modulation
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