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23 May 1997 New spectral selection system for infrared imaging of carbon monoxide in combustion environments
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Proceedings Volume 3108, Combustion Diagnostics; (1997)
Event: Environmental Sensing III, 1997, Munich, Germany
In this work, a new spectral selection system for imaging of CO infrared emission in combustion environments is proposed. The CO and CO2 medium infrared emission bands are spectrally overlapped, so cross-talk effects would appear when trying to image CO using a IR camera equipped with a conventional band-pass filter. The system proposed belongs to a new family of infrared multilayer filters, called solid state Fabry-Perot (SSFP) filters. The transmittance of such filters can be spectrally matched to the CO fine structure emission band. Thus, it is possible to discriminate the CO emitted IR radiation from that which comes from CO2 in combustion environments. With a Fourier Transform Infrared spectroradiometer, we have studied and spectrally characterized the IR emission from hydrocarbon flames, varying the O2 inlet, i.e. the CO generated. Using these experimental data and the theoretical spectral transmission for both band-pass filter and the SSFP filter, we have demonstrated the uselessness of the former and the suitability of the latter, in order to discriminate CO and CO2. A silicon wafer, both sides covered by a reflecting multilayer, is proposed as a SSFP. The design and spectral parameters of such a filter are developed on the basis of the optical properties of the multilayers and substrate, and specific designs for CO imaging are presented.
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Jesus Meneses, Susana Briz, Antonio J. de Castro, Juan Melendez, and Fernando Lopez "New spectral selection system for infrared imaging of carbon monoxide in combustion environments", Proc. SPIE 3108, Combustion Diagnostics, (23 May 1997);

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