Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5488663 | Infrared Physics & Technology | 2017 | 34 Pages |
Abstract
A compact and mobile system was demonstrated for the detection of carbon monoxide (CO) at trace level. This system adopted a high-power, continuous wave (CW), distributed feedback quantum cascade laser (DFB-QCL) operating at â¼22 °C as excitation source. Wavelength modulation spectroscopy (WMS) as well as second harmonic detection was used to isolate complex, overlapping spectral absorption features typical of ambient pressures and to achieve excellent specificity and high detection sensitivity. For the selected P(11) absorption line of CO molecule, located at 2099.083 cmâ1, a limit of detection (LoD) of 26 ppb by volume (ppbv) at atmospheric pressure was achieved with a 1 s acquisition time. Allan deviation analysis was performed to investigate the long term performance of the CO detection system, and a measurement precision of 3.4 ppbv was observed with an optimal integration time of approximate 114 s, which verified the reliable and robust operation of the developed system.
Keywords
Related Topics
Physical Sciences and Engineering
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Atomic and Molecular Physics, and Optics
Authors
Jingmin Dang, Haiye Yu, Yujing Sun, Yiding Wang,