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15 December 1998 Infrared simultaneous gas detector for an atmospheric environmental network
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A pollutant gas detector is presented. The sensor system detects simultaneously CO and SO2 in a range from 0 to 200 ppm with a resolution of 7 ppm, however the system is bale to analyze up to 19 gases simultaneously. A new technique based on a multilayer filter array is proposed to prevent the use of moving parts. The central-wavelengths of filters were selected according to the position of the absorption band of interest for each gas. The CO and SO2 central-wavelengths were measured and its transmission spectral response was also predicted by using the HITRAN database. Also a new conditioning circuit with high- performance is proposed using low-cost components. The circuit is based on shifting the measured signal to intermediate frequency. With this technique a reduction of 1/f noise is achieved. The new systems features reduction of moving parts, high acquisition speed and low-cost.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Juan A. Chavez, Juan Antonio Ortega Redondo, Antoni Turo, Jordi Salazar, and Miguel J. Garcia "Infrared simultaneous gas detector for an atmospheric environmental network", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998);


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