Air Quality Monitoring Using UWB Radar

Carbon nanotubes (CNT) have exceptional electrical properties that make them likely candidates for Iow cost wireless gas sensors. In this work, we present a novel design scheme for a low-cost ammonia gas sensor utilizing an UWB radar operating in the 3-10 GHz range. When exposed to gas, significant changes in the amplitudes of the backscattered signals of the CNT films are observed. Coupling of a CNT-based passive sensor with the radar enables remote gas detection with high selectivity, at a considerably lower cost in comparison to most commercially available gas sensors.