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| Design and Research of Near-infrared Cavity Ring-down Spectroscopy System |
| Received:December 25, 2018 Revised:June 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.06.005 |
| KeyWord:spectroscopy CRDS trigger circuit ring-down time HO2 free radical |
| Author | Institution |
| ZHOU Jia-cheng |
1.Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei , China; 2. University of Science and Technology of China, Hefei , China |
| XU Xue-zhe |
1.Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei , China |
| LEI Jia-jie |
3. Nanjing University of Information Science and Technology, Nanjing , China |
| FANG Bo |
1.Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei , China; 2. University of Science and Technology of China, Hefei , China |
| ZHAO Wei-xiong |
1.Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei , China |
| ZHANG Wei-jun |
1.Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei , China; 2. University of Science and Technology of China, Hefei , China |
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| Abstract: |
| Objective To construct a near-infrared cavity ring-down spectroscopy system to detect water-vapor absorption. Methods The absorption of medium in the cavity was detected through measurements of the ring-down time in presence or absence of medium. The reflectivity of the cavity high-reflection mirror was calculated. Different concentrations of water vapor were measured to verify whether the system can be used for measurement of molecular absorption. Results The cavity ring-down time of the device was about 3.75 μs, corresponding to a cavity mirror reflectivity of 99.982%, and an effective absorption optical path of 1.1 km. The water vapor absorption at 6627.7 cm-1 was measured, and the results were consistent with the HITRAN database. Through investigating absorption intensity in literatures and HITRAN database, the absorption coefficients of NH3, C2H2, and HO2 radical had been simulated in the wavelength range of 6625-6626 cm-1. Conclusion The device could detect the vapor absorption and can be applied to real-time measurement of NH3, C2H2 and HO2 free radicals within the operating wavelength of the laser. |
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