Capacitive Sensor for Gaseous Substances, from Old to New

Abstract

In a previous development, it became important to be able to detect changes in the concentration of certain gases in the air. To this end, we want to develop a capacitive sensor that can effectively detect very small changes in composition. To design such a sensor, we wanted to use an old capacitive component, the application of which is described in the following article. The capacitive sensor-processor circuit described in this paper, as a useful solution for operating a planar capacitor, can be advantageously used in the context of certain interactive suits, active wearable. In this paper, the sensor itself, the analog-to-digital solution that interrogates the sensor, is presented.