VOC sensors are used to measure the increase in concentration of volatile organic compounds. These work in part on the photoacoustic sensor principle. Here, a plate coated with substrate is heated by the use of a heat plate in the sensor. Through this process, the molecules in the air are made sensitive and react with the plate. This results in sound waves generated by thermal expansion. These measure the changes in the gases (molecules) in the air and a change in resistance results. This change in resistance allows conclusions to be drawn about individual compounds. If additional sensors are used, such as temperature, CO2 and humidity sensors, it is possible to obtain more precise measurement results. This is often referred to as sensor fusion.
The method developed here uses the properties of the sensors used to obtain an overall sensor system. The combination of the individual sensor values results in clearly recognizable measurement patterns that can be assigned to the individual connections. With the help of these unambiguous assignments, individual compounds can be distinguished from one another. In the applied method, three different alcohols were distinguished from each other.
In Partnership with LeddarTech
In Partnership with ROHM Semiconductor
In Partnership with STMicroelectronics
In Partnership with Laird Thermal Systems
In Partnership with YAGEO Group