Wireless sensor networks for home automation or environment monitoring require low-cost low-power sensors. Carbon monoxide (CO) metal–oxide (MOX) sensors could be suitable in terms of device cost, but they show some severe limits, such as the need to be heated, which means large power consumption and the need for complex and frequent calibration procedures, which increases the overall cost. This paper investigates the possibility to partially overcome these limits by a low-cost detection system based on a suitable commercial sensor (TGS 2442, Figaro, Inc.) and an ad hoc measurement technique exploiting specifically tailored temperature profiles. To this aim, the authors study the dynamic behavior of low-power CO MOX sensors operated with pulsed temperature profiles by means of two approaches: 1) sensor modeling and 2) experimental evaluation. To analyze how the sensor dynamic response changes as a function of the CO concentration, the authors individuate a temperature profile, which ensures satisfactory sensitivity to the target gas and very low power consumption. Moreover, some parameters describing the sensor response shape are selected, which prove to be significant in terms of both robustness to environmental conditions and calibration simplicity
Wireless sensor networks for home automation require low-cost low-power sensors. Carbon Monoxide (CO) MOX sensors could be suitable concerning device cost; their limits concern the need to be heated, requiring a lot ofpower, and to be calibrated, increasing overall cost. This work investigates on behaviour of low-power CO MOX sensors with pulsed temperature profile by means of a double approach: sensor modeling and experimental evaluation. Analyzing how sensor thermal dynamic changes as a function of CO concentration yields to more information that can be used for diagnostic purposes or directly to estimate CO concentration. Particularly, two a-dimensionalfeatures have been tested to furnish an indication of CO concentration regardless any calibration. Results show effectiveness ofthe proposed approach.
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