25 October 2016 High sensitivity measurement of NO, NO2 and NH3 using MIR-QCL and time division multiplexing WMS technology
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Proceedings Volume 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology; 101561J (2016) https://doi.org/10.1117/12.2247150
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
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.
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Xiang Chen, Xiang Chen, Chenguang Yang, Chenguang Yang, Mai Hu, Mai Hu, Zhenyu Xu, Zhenyu Xu, Xueli Fan, Xueli Fan, Min Wei, Min Wei, Lu Yao, Lu Yao, Yabai He, Yabai He, Ruifeng Kan, Ruifeng Kan, } "High sensitivity measurement of NO, NO2 and NH3 using MIR-QCL and time division multiplexing WMS technology", Proc. SPIE 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology, 101561J (25 October 2016); doi: 10.1117/12.2247150; https://doi.org/10.1117/12.2247150
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