Research on the Temperature Drift Suppressing of Gas Sensor Array

Semiconductor gas sensors have a problem of drift, which is obviously affected by the change of the circumstance temperature. Temperature sensor, and humidity sensor could be used in gas sensor array to monitor working circumstance of the gas sensors. A thermostat was employed to set a series of temperatures in the experiment system, 20 gas samples (ten for each concentration) were prepared and the response of sensors to these gas samples was collected. Artificial neural networks were used to recognize samples. The response of temperature sensor was introduced into the original networks and eliminated the misjudgments. Drift was suppressed to some extent and the performance of networks was also improved, which eventually verified the validity of the method for temperature drift suppressing.