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Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection

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Wojtas J., Bielecki Z., Stacewicz T., Mikolajczyk J., Medrzycki R., Rutecka B.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
794-797
EN
Application of quantum cascade lasers in NO and N_2O sensor is described. Cavity enhanced absorption spectroscopy was used for this purpose. The detection was performed at vibronic molecular transitions in spectral regions of 5.23-5.29 μm and 4.46-4.54 μm for NO and N_2O, respectively. In order to avoid interferences by the gases contained in atmosphere (H_2O, CO_2) the lines of 5.263 μm for NO and 4.530 μm for N_2O were selected. Our two channel sensor is designated for simultaneous detection of both compounds. Each channel consists of single mode quantum cascade laser, optical cavity, and a photodetection module. The lasers were precisely tuned to the wavelength of interest. Optical cavities were built with spherical mirrors of high reflectance. The signals from the cavities outputs were registered with specially developed low noise detection modules.
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Nitrogen Oxides Optoelectronic Sensors Operating in Infrared Range of Wavelengths

100%
Wojtas J., Bielecki Z., Stacewicz T., Mikolajczyk J., Rutecka B., Medrzycki R.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
592-594
EN
Investigation of nitric oxide and nitrous oxide optoelectronic sensors is described. The detection of both components was done by measurement of absorption that occurs due to transition between vibronic molecular transitions. The improvement of the sensitivity was achieved due to application of cavity enhanced absorption spectroscopy. Two optical cavities (each one for each gas) built of high reflectance spherical mirrors were used. While the spectra of observed transitions are situated in mid-infrared range, two single mode quantum cascade lasers were applied. Their narrow emission lines were precisely tuned to the absorption lines of both investigated gases. The measurement of different mixtures of Ar-NO and Ar-N_2O within the range from 100 ppb to 10 ppm was performed. The relative uncertainty of the results did not exceed the level of 13%.
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Applying CEAS method to UV, VIS, and IR spectroscopy sensors

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Wojtas J., Mikolajczyk J., Nowakowski M., Rutecka B., Medrzycki R., Bielecki Z.
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2011
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issue 4
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