CO2 sensor for mainstream capnography based on TDLAS |
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Authors: | A Hartmann R Strzoda R Schrobenhauser R Weigel |
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Institution: | 1. Siemens AG, Corporate Technology, Otto-Hahn-Ring 6, 81739, Munich, Germany 2. Institute for Electronics Engineering, University of Erlangen-Nuremberg, Cauerstrasse 9, 91058, Erlangen, Germany
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Abstract: | The setup and signal processing for a mainstream capnography sensor is presented in this paper. The probe exhibits an optical path length of 2.5 cm and is equipped with a vertical-cavity surface-emitting laser at 2 μm. The sensor does not need any calibration, since the CO2 absorption line as well as the laser background is measured using direct tunable diode laser absorption spectroscopy. Unavoidable optical fringes are reduced with a self-developed fringe rejection method. The sensor achieves a concentration resolution <300 ppmv at 4 vol% and a measurement rate >30 Hz. |
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