23 September 2005 Cavity enhanced spectroscopy for NO2 detection
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Abstract
We present an experiment on detection of nitrogen dioxide in free air using cavity enhanced spectroscopy. As a light source a blue pulsed diode laser was applied, while the output signal was detected with a photomultiplier. The absorber concentration was found by investigation of the optical resonator quality. It was done by determination of decay time of radiation pulse trapped in the cavity. Also the measurement of the phase shift between the output signal and modulation signal was used as the alternative method. The detection limit better than 1 ppb was demonstrated. The aim of this experiment was to study potential application of cavity enhanced absorption spectroscopy for construction of fully optoelectronic NO2 detector which could replace the commonly used chemical detectors.
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Jacek Wojtas, Jacek Wojtas, Adam Czyzewski, Adam Czyzewski, Tadeusz Stacewicz, Tadeusz Stacewicz, Zbigniew Bielecki, Zbigniew Bielecki, Janusz Mikolajczyk, Janusz Mikolajczyk, } "Cavity enhanced spectroscopy for NO2 detection", Proc. SPIE 5954, Optical Security Systems, 59540R (23 September 2005); doi: 10.1117/12.622155; https://doi.org/10.1117/12.622155
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