A portable low-power QEPAS-based CO2 isotope sensor using a fiber-coupled interband cascade laser
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AbstractCurrent field and medical applications demand better quantification of CO isotopic ratios with high sensitivity, fast time-response, portable instrument size, and low power consumption. We report such a CO isotope sensor using quartz-enhanced photoacoustic spectroscopy (QEPAS) with a continuous-wave interband cascade laser (ICL). The ICL emitting at 4.35 μm with a low drive current (35–60 mA) and optical power (<2.6 mW) covered the P(43) and P(44) lines of CO and the R(18) line of CO with a single current scan. The ICL radiation was coupled into a solid-core (100-μm core diameter) indium fluoride optical fiber with a coupling efficiency of 88%. We successfully delivered the single-mode laser beam from the fiber output into the off-beam QEPAS spectrophone enclosed in a compact gas cell. The generated photoacoustic signal was acquired and analyzed by a digital lock-in amplifier to obtain its second harmonic (2f) component. Our sensor is capable of analyzing the CO isotopic ratio with an average precision of <1‰, which fulfills the precision requirements of most medical and field applications.
All Author(s) ListWang Z., Wang Q., Ching J., Wu J., Zhang G., Ren W.
Journal nameSensors and Actuators B: Chemical
Year2017
Month7
Volume Number246
PublisherElsevier B.V.
Pages710 - 715
ISSN0925-4005
LanguagesEnglish-United Kingdom
KeywordsCO2 isotope, Interband cascade laser, Mid-infrared fiber, Quartz-enhanced photoacoustic spectroscopy

Last updated on 2020-25-11 at 03:15