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A dual comb spectrometer is used as gas sensor for the parallel detection of nitrous oxide (N 2 O) and carbon monoxide (CO). These gases have overlapping absorption features in the mid-infrared (MIR) at a wavelength of 4.6 µm. With a spectra acquisition rate of 10 Hz, concentrations of 50 ppm N 2 O and 30 ppm CO are monitored with a relative precision of6   ×10−   36\times {10^{-3}}    and3   ×10−   33\times {10^{-3}}    respectively. The limit of detections are 91 ppb for N 2 O and 50 ppb for CO for an integration time of 25 s. The system exhibits a linear sensitivity from 2 ppm to 100 ppm with coefficients of determination of 0.99998 for N 2 O and 0.99996 for CO.

Two-component gas sensing with MIR dual comb spectroscopy: Fast and precise monitoring of concentrations despite complex spectra