WIRELESSLY INTERROGABLE SURFACE-ACOUSTIC-WAVE SENSORS FOR VEHICULAR APPLICATIONS

Wirelessly interrogated passive surface acoustic wave (SAW) sensors fo r measurements in a rough environment are shown, These can be applied when remote readout is sensors cannot withstand heat, dirt, and/or ele ctromagnetic interference. Applications of passive SAW sensors for sen sing tasks, especially in vehicles are discussed, The implementation o f SAW sensors for measurements of torque and speed of revolution on tr ansmission shafts is discussed, We present measurements of railway dis c brake temperature by on-disc SAW sensors and wireless measurement of the air pressure in the tires of road vehicles in motion, The applied SAW sensors, the corresponding interrogation systems and an algorithm for signal processing are described, Estimations of measurement error s and results of measurements are discussed.