Algorithm for concentration analysis with laser absorption spectroscopy
2012
To measure the concentration of a fluid under consideration by means of tunable diode laser spectroscopy an algorithm
for automatic detection of absorption transitions has been developed. The algorithm consists of a three step process. In
the first step, necessary information is taken from the HITRAN database. Measured data are analyzed in the second step
in order to eliminate the laser characteristics underlying the absorption spectrum, to localize the absorption lines and to
get convenient initial values for fitting the absorption transitions to a Lorentzian line shape profile in step 3. The
concentration is calculated from the best approximation among all parameters from the transitions found on the signal.
The developed algorithm was tested with a set of simulated curves with different concentrations of carbon dioxide
transitions at the 2.004 μm band and it could analyse concentrations with relative error better than 1% for concentrations
down to approximately 200 ppb. Computation time including acquisition time and graphical output display is fast
enough to enable online monitoring of fluid concentrations.
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