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16 May 2007 Study of optoelectronic NO2 detector using cavity enhanced absorption spectroscopy
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We present the study of potential application of Cavity Enhanced Absorption Spectroscopy (CEAS) for construction of fully optoelectronic and portable NO2 detector which could replace the commonly used chemical detectors. We demonstrate an experiment on detection of NO2 in the ambient air. The concentration of investigated absorber was found by determination of decay time of pulse radiation trapped in the optical cavity constructed with two mirrors of a very high reflectivity coefficient (R > 99,99%). As a light source a blue pulsed diode laser was applied. The output signal was detected by a photomultiplier and analysed by a digital oscilloscope. For this construction the detection limit better than 1 ppb was obtained. The cavity parameters and it's adjustment were controlled by a beam from a red laser that is not absorbed by NO2. In order to perform the measurements in two spectral regions the special mirrors have been developed. Study of influence of another NOx compounds (especially NO3) on final result was investigated as well.
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Adam Czyzewski, Jacek Wojtas, Tadeusz Stacewicz, Zbigniew Bielecki, and Miroslaw Nowakowski "Study of optoelectronic NO2 detector using cavity enhanced absorption spectroscopy", Proc. SPIE 6585, Optical Sensing Technology and Applications, 65851R (16 May 2007);

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