Abstract
One single semiconductor distributed-feedback (DFB) laser is used to demonstrate the possibility of simultaneous measurements of CO and CO2 at elevated temperatures. Wavelength modulation spectroscopy with second-harmonic detection is used to improve the detection sensitivity and accuracy. The concentrations of CO and CO2 are determined from the WMS-1-normalized absorption-based WMS-2f signal peak heights of a proper line pair of CO and CO2 near 6357.814cm−1 and 6357.312cm−1, which are selected using some line-selection criterions for the target temperature range of 300–1000K. The CO and CO2 concentrations measurements are within 2.86% and 2.69% of the expected values over the tested temperature range 300–1000K. The minimum detectable concentrations of CO and CO2 at 1000K are 250ppmm and 280ppmm respectively.
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