Abstract
A highly sensitive mid-infrared dual-range real-time trace sensor was developed for ethane detection in exhaled breath, in which a continuous-wave (CW) mode interband cascade laser (ICL) emitting at 3348.2 nm and a multi-pass gas cell (MPGC) with an effective optical absorption length of 76.3 m were adopted in the trace sensor. The ethane concentration in the exhaled breath was measured by scanning the ethane absorption lines at 2986.7 cm−1 and 2988.2 cm−1 using wavelength modulation spectroscopy (WMS) techniques of tunable diode laser absorption spectroscopy (TDLAS), which allows for highly sensitive detection in two ethane concentration ranges. The Allan deviation indicated the limit of detection (LoD) of the sensor system can be averaged up to ∼269 ppt over the entire integration time.
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