CO2 concentrations).
Noise in the CO and CO2 measurements were 3 and
600 ppm, respectively. As a result, the background
concentrations of CO and CO2 in the atmosphere before
the burning tests cannot be measured. Noise and baseline
drift can be minimized by selecting absorption lines of CO
and CO2 that do not overlap with each other. The limited
tuning range of the DFB laser prevented the full resolution
of these absorption line shapes. The use of a vertical cavity
surface emitting laser, which can scan several absorption
lines over a single laser current scan,