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  Standoff detection of VOCs using external cavity quantum cascade laser spectroscopy

Liu, N., Zhou, S., Zhang, L., Yu, B., Fischer, H., Ren, W., et al. (2018). Standoff detection of VOCs using external cavity quantum cascade laser spectroscopy. Laser Physics Letters, 15(8): 085701. doi:10.1088/1612-202X/aac356.

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 Creators:
Liu, Ningwu1, Author
Zhou, Sheng1, Author
Zhang, Lei1, Author
Yu, Benli1, Author
Fischer, Horst2, Author           
Ren, Wei1, Author
Li, Jingsong1, Author
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1external, ou_persistent22              
2Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: Broadband tunable external cavity quantum cascade lasers (ECQCLs) have emerged as attractive laser sources for mid-infrared spectroscopic applications to detect various chemical agents. Here we report on the development of a pulsed, broadband ECQCL-based sensor for open-path sensing multiple volatile organic compounds (VOCs). Instead of using a standard infrared mercury cadmium telluride detector, a quartz crystal tuning fork with a high resonant frequency (~75 kHz) was used as a light detector for laser signal collection. For signal processing, a self-established spectral analysis model integrated with 1D cubic spline interpolation algorithm, multiple linear regression algorithm and fast Fourier transform was developed for quantitative and qualitative analysis of VOC components. The ECQCL sensor was successfully demonstrated for the stand-off detection of three VOCs mixing plume (i.e. ethanol, acetone and diethyl ether) at a distance of 40 m, proving its applicability for leak plumes in security fields.

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 Dates: 2018
 Publication Status: Published online
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 Rev. Type: -
 Identifiers: ISI: 000434669300001
DOI: 10.1088/1612-202X/aac356
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Title: Laser Physics Letters
  Other : Laser Phys. Lett.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH Verlag GmbH & Co. KGaA
Pages: - Volume / Issue: 15 (8) Sequence Number: 085701 Start / End Page: - Identifier: ISSN: 1612-2011
CoNE: https://pure.mpg.de/cone/journals/resource/111073420269004