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    Widely-tunable and sensitive optical sensor for multi-species detection in the mid-IR

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    Alquaity+et+al_2017_Meas._Sci._Technol._10.1088_1361-6501_aa912b.pdf
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    Type
    Article
    Authors
    Alquaity, Awad cc
    Alsaif, Bidoor
    Farooq, Aamir cc
    KAUST Department
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    Electrical Engineering Program
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-12-07
    Online Publication Date
    2017-12-07
    Print Publication Date
    2018-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/625859
    
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    Abstract
    Pulsed cavity ringdown spectroscopy (CRDS) technique was used to develop a novel widely-tunable laser-based sensor for sensitive measurements of ethylene, propene, 1-butene and allene in the mid-IR. The use of an external-cavity quantum cascade laser (EC-QCL) enabled the sensor to cover a wide wavelength range from 10 to 11.1 µm (900 – 1000 cm-1) to detect multiple gases relevant to combustion and environment. The sensor operation was validated in a room-temperature static cell using well-characterized absorption lines of carbon dioxide near 938.69 cm-1 and 974.62 cm-1. Detection limits for ethylene, propene, 1-butene, and allene were measured to be 17, 134, 754 and 378 ppb, respectively, at 296 K and 760 Torr for a single-pass path-length of 70 cm. The excellent sensitivity of the optical sensor enabled it to measure the aforementioned gases at levels smaller than 1% of their recommended exposure limits. To the best of our knowledge, this is one of the first successful applications of the pulsed CRDS technique to measure trace levels of multiple gases in the 10 – 11 µm wavelength region.
    Citation
    Alquaity A, Al-Saif B, Farooq A (2017) Widely-tunable and sensitive optical sensor for multi-species detection in the mid-IR. Measurement Science and Technology. Available: http://dx.doi.org/10.1088/1361-6501/aa912b.
    Sponsors
    Research reported in this publication was funded by King Abdullah University of Science and Technology (KAUST) under the competitive center funding (CCF) program.
    Publisher
    IOP Publishing
    Journal
    Measurement Science and Technology
    DOI
    10.1088/1361-6501/aa912b
    Additional Links
    http://iopscience.iop.org/article/10.1088/1361-6501/aa912b
    ae974a485f413a2113503eed53cd6c53
    10.1088/1361-6501/aa912b
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Electrical and Computer Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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