High sensitivity measurement of NO, NO2 and NH3 using MIR-QCL and time division multiplexing WMS technology

Xiang Chen, Chenguang Yang, Mai Hu, Zhenyu Xu, Xueli Fan, Min Wei, Lu Yao, Yabai He, Ruifeng Kan*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

1 Citation (Scopus)

Abstract

A compact system based on mid-infrared quantum cascade laser (QCL) operated in room temperature was developed for the simultaneous monitoring of NO, NO2 and NH3 in the air. Laser beams of three QCLs with central wavelength located at 1900 cm-1, 1600 cm-1, 1103.4 cm-1 were coupled to pass through the 60m long gas cell together. With the technology of time division multiplexing, wavelength modulation spectroscopy (WMS) signals of three lasers can be detected at adjacent scan process. The real-Time second harmonic analysis was implemented to achieve simultaneous detection of NO, NO2 and NH3. A minimum detection limit (MDL) of 0.2ppb for NO, 0.12ppb for NO2 and 0.1ppb for NH3 with an optimum integration time around 100 seconds can be achieved for this setup. An ambient monitoring of three gasses during 5 hours was performed to inspect the local air quality.

Original languageEnglish
Title of host publicationHyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology
EditorsWenqing Liu, Jinnian Wang
Place of PublicationBellingham, WA
PublisherSPIE
Pages1-8
Number of pages8
ISBN (Electronic)9781510607705
DOIs
Publication statusPublished - 2016
Externally publishedYes
EventInternational Symposium on Hyperspectral Remote Sensing Applications and the International Symposium on Environmental Monitoring and Safety Testing Technology - Beijing, China
Duration: 9 May 201611 May 2016

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume10156

Other

OtherInternational Symposium on Hyperspectral Remote Sensing Applications and the International Symposium on Environmental Monitoring and Safety Testing Technology
CountryChina
CityBeijing
Period9/05/1611/05/16

Keywords

  • absorption spectroscopy
  • mid-infrared
  • quantum cascade laser
  • real-time monitoring
  • time divide multiplexing
  • wavelength modulation

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  • Cite this

    Chen, X., Yang, C., Hu, M., Xu, Z., Fan, X., Wei, M., ... Kan, R. (2016). High sensitivity measurement of NO, NO2 and NH3 using MIR-QCL and time division multiplexing WMS technology. In W. Liu, & J. Wang (Eds.), Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology (pp. 1-8). [101561J] (Proceedings of SPIE; Vol. 10156). Bellingham, WA: SPIE. https://doi.org/10.1117/12.2247150