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Proceedings Paper

Algorithm for concentration analysis with laser absorption spectroscopy
Author(s): Alberto Rodrigues; Volker Lange; Dietrich Kühlke
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Paper Abstract

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.

Paper Details

Date Published: 18 December 2012
PDF: 6 pages
Proc. SPIE 8550, Optical Systems Design 2012, 85502A (18 December 2012); doi: 10.1117/12.981178
Show Author Affiliations
Alberto Rodrigues, Hochschule Furtwangen Univ. (Germany)
Volker Lange, Hochschule Furtwangen Univ. (Germany)
Dietrich Kühlke, Hochschule Furtwangen Univ. (Germany)


Published in SPIE Proceedings Vol. 8550:
Optical Systems Design 2012
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood; Marta C. de la Fuente; Jean-Luc M. Tissot; Jeffrey M. Raynor; Daniel G. Smith; Frank Wyrowski; Andreas Erdmann; Tina E. Kidger; Stuart David; Pablo Benítez, Editor(s)

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