| 光谱学与光谱分析 |
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| Off-Axis Cavity Enhanced Absorption Spectroscopy Detection Techniques for the Measurement of Carbon Dioxide |
| ZHAO Hui, WANG Gui-shi, CAI Ting-dong, GAO Xiao-ming* |
| Laboratory of Atmosphere Physcis & Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract The spectrum of carbon monoxide was obtained around 1.573 μm 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.
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Received: 2011-03-16
Accepted: 2011-07-20
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Corresponding Authors:
GAO Xiao-ming
E-mail: xmgao@aiofm.ac.cn
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