中国物理B ›› 2018, Vol. 27 ›› Issue (4): 40701-040701.doi: 10.1088/1674-1056/27/4/040701

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Highly-sensitive NO, NO2, and NH3 measurements with an open-multipass cell based on mid-infrared wavelength modulation spectroscopy

Xiang Chen(陈祥), Chen-Guang Yang(杨晨光), Mai Hu(胡迈), Jian-Kang Shen(沈建康), Er-Chao Niu(牛二超), Zhen-Yu Xu(许振宇), Xue-Li Fan(范雪丽), Min Wei(魏敏), Lu Yao(姚路), Ya-Bai He(何亚柏), Jian-Guo Liu(刘建国), Rui-Feng Kan(阚瑞峰)   

  1. 1. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 2300314, China;
    2. University of Science and Technology of China, Hefei 230022, China;
    3. Jiangsu Environmental Monitoring Center, Nanjing 210036, China
  • 收稿日期:2017-10-24 修回日期:2018-01-03 出版日期:2018-04-05 发布日期:2018-04-05
  • 通讯作者: Rui-Feng Kan E-mail:kanruifeng@aiofm.ac.cn
  • 基金资助:
    Project supported by the National Key Scientific Instrument and Equipment Development, China (Grant No. 2014YQ060537) and the National Key Research and Development Program, China (Grant No. 2016YFC0201103).

Highly-sensitive NO, NO2, and NH3 measurements with an open-multipass cell based on mid-infrared wavelength modulation spectroscopy

Xiang Chen(陈祥)1,2, Chen-Guang Yang(杨晨光)1, Mai Hu(胡迈)1, Jian-Kang Shen(沈建康)3, Er-Chao Niu(牛二超)3, Zhen-Yu Xu(许振宇)1, Xue-Li Fan(范雪丽)1, Min Wei(魏敏)1,2, Lu Yao(姚路)1, Ya-Bai He(何亚柏)1, Jian-Guo Liu(刘建国)1, Rui-Feng Kan(阚瑞峰)1   

  1. 1. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 2300314, China;
    2. University of Science and Technology of China, Hefei 230022, China;
    3. Jiangsu Environmental Monitoring Center, Nanjing 210036, China
  • Received:2017-10-24 Revised:2018-01-03 Online:2018-04-05 Published:2018-04-05
  • Contact: Rui-Feng Kan E-mail:kanruifeng@aiofm.ac.cn
  • Supported by:
    Project supported by the National Key Scientific Instrument and Equipment Development, China (Grant No. 2014YQ060537) and the National Key Research and Development Program, China (Grant No. 2016YFC0201103).

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摘要： A compact prototype based on mid-infrared wavelength modulation spectroscopy (WMS) is developed for the simultaneous monitoring of NO, NO2, and NH3 in the urban area. Three quantum cascade lasers (QCLs) with central frequencies around 1900.0 cm-1, 1600.0 cm-1, and 1103.4 cm-1 are used for NO, NO2, and NH3 detections, respectively, by time-division multiplex. An open-path multi-pass cell of 60-m optical path length is applied to the instrument for high sensitivity and reducing the response time to less than 1 s. The prototype achieves a sub-ppb detection limit for all the three target gases with an average time of about 100 s. The instrument is installed in the Jiangsu environmental monitoring center to conduct performance tests on ambient air. Continuous 24-hour measurements show good agreement with the results of a reference instrument based on the chemiluminescence technique.

关键词: wavelength modulation spectroscopy, optical sensing, atmospheric monitoring, time division multiplexing, quantum cascade laser, mid-infrared laser spectroscopy

Abstract: A compact prototype based on mid-infrared wavelength modulation spectroscopy (WMS) is developed for the simultaneous monitoring of NO, NO2, and NH3 in the urban area. Three quantum cascade lasers (QCLs) with central frequencies around 1900.0 cm-1, 1600.0 cm-1, and 1103.4 cm-1 are used for NO, NO2, and NH3 detections, respectively, by time-division multiplex. An open-path multi-pass cell of 60-m optical path length is applied to the instrument for high sensitivity and reducing the response time to less than 1 s. The prototype achieves a sub-ppb detection limit for all the three target gases with an average time of about 100 s. The instrument is installed in the Jiangsu environmental monitoring center to conduct performance tests on ambient air. Continuous 24-hour measurements show good agreement with the results of a reference instrument based on the chemiluminescence technique.

Key words: wavelength modulation spectroscopy, optical sensing, atmospheric monitoring, time division multiplexing, quantum cascade laser, mid-infrared laser spectroscopy

中图分类号:  (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

  • 07.07.Df
33.20.-t (Molecular spectra) 42.55.Px (Semiconductor lasers; laser diodes) 42.62.-b (Laser applications)