A portable low-power QEPAS-based CO2 isotope sensor using a fiber-coupled interband cascade laser
Publication in refereed journal

Times Cited
Altmetrics Information

Other information
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
Volume Number246
PublisherElsevier B.V.
Pages710 - 715
LanguagesEnglish-United Kingdom
KeywordsCO2 isotope, Interband cascade laser, Mid-infrared fiber, Quartz-enhanced photoacoustic spectroscopy

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