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Measurements of carbon monoxide mixing ratios in Houston using a compact high-power CW DFB-QCL-based QEPAS sensor |
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| Authors: | Przemysław Stefański Rafał Lewicki Nancy P. Sanchez Jan Tarka Robert J. Griffin Manijeh Razeghi Frank K. Tittel |
| Affiliation: | 1. Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA 4. Laser and Fiber Electronics Group, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370, Wroclaw, Poland 2. Department of Civil and Environmental Engineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA 3. Department of Electrical Engineering and Computer Science, Center for Quantum Devices, Northwestern University, 633 Clark Street, Evanston, IL, USA |
| Abstract: | Measurements of carbon monoxide (CO) mixing ratios in Houston, Texas, during the period from May 16, 2013 to May 28, 2013 were performed using a sensitive, selective, compact, and portable quartz-enhanced photoacoustic spectroscopy (QEPAS)-based CO sensor employing a high-power continuous wave (CW) distributed feedback quantum cascade laser (DFB-QCL). The minimum detectable CO concentration was 3 ppbv for the strong, interference-free R(6) absorption line at 2,169.2 cm?1 and a 5 s data acquisition time. The average CO concentration during the measurement period was 299.1 ± 81.4 ppb with observed minimum and maximum values of 210.5 and 4,307.9 ppb, respectively. A commercially available electrochemical sensor was employed in-line for simultaneous measurements to confirm the response of the CW DFB-QCL-based QEPAS sensor to variations of the CO mixing ratios. Moderate agreement (R 2 = 0.7) was found between both sets of CO measurements. |
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