Infrared simultaneous gas detector for an atmospheric environmental network

Juan A. Chavez; Juan Antonio Ortega Redondo; Antoni Turo; Jordi Salazar; Miguel J. Garcia

doi:10.1117/12.332647

15 December 1998 Infrared simultaneous gas detector for an atmospheric environmental network

Juan A. Chavez, Juan Antonio Ortega Redondo, Antoni Turo, Jordi Salazar, Miguel J. Garcia

Proceedings Volume 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques; (1998) https://doi.org/10.1117/12.332647
Event: Remote Sensing, 1998, Barcelona, Spain

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.

Citation Download Citation

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); https://doi.org/10.1117/12.332647

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KEYWORDS

Sensors

Carbon monoxide

Gases

Absorption

Infrared radiation

Infrared sensors

Photoresistors

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