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Proceedings Paper

Infrared simultaneous gas detector for an atmospheric environmental network
Author(s): Juan A. Chavez; Juan Antonio Ortega Redondo; Antoni Turo; Jordi Salazar; Miguel J. Garcia
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Paper Abstract

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.

Paper Details

Date Published: 15 December 1998
PDF: 11 pages
Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); doi: 10.1117/12.332647
Show Author Affiliations
Juan A. Chavez, Univ. Politecnica de Catalunya (Spain)
Juan Antonio Ortega Redondo, Univ. Politecnica de Catalunya (Spain)
Antoni Turo, Univ. Politecnica de Catalunya (Spain)
Jordi Salazar, Univ. Politecnica de Catalunya (Spain)
Miguel J. Garcia, Univ. Politecnica de Catalunya (United States)

Published in SPIE Proceedings Vol. 3493:
Spectroscopic Atmospheric Environmental Monitoring Techniques
Klaus Schaefer, Editor(s)

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