Title :
Wirelessly interrogable surface acoustic wave sensors for vehicular applications
Author :
Pohl, Alfred ; Seifert, Franz
Author_Institution :
Appl. Electron. Lab., Univ. of Technol., Wien, Austria
fDate :
8/1/1997 12:00:00 AM
Abstract :
Wirelessly interrogated passive surface acoustic wave (SAW) sensors for measurements in a rough environment are shown. These can be applied when remote readout is necessary and other sensors cannot withstand heat, dirt, mechanical vibration, and/or electromagnetic interference. Applications of passive SAW sensors for sensing tasks, especially in vehicles are discussed. The implementation of SAW sensors for measurements of torque and speed of revolution on transmission shafts is discussed. We present measurements of railway disc 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 errors and results of measurements are discussed
Keywords :
automotive electronics; electromagnetic interference; high-temperature techniques; piezoelectric transducers; pressure sensors; remote sensing; signal processing; surface acoustic wave sensors; temperature measurement; torque measurement; LiNbO3; dirt; electromagnetic interference; high temperature measurement; interrogation systems; measurement errors; mechanical vibration; microwave measurement; passive SAW sensors; pressure measurement; railway disc brake temperature; remote sensing; rough environment; signal processing; speed of revolution; surface acoustic wave sensors; tires; torque measurement; transmission shafts; vehicles; wireless measurement; Acoustic sensors; Acoustic waves; Electromagnetic measurements; Mechanical sensors; Motion measurement; Pressure measurement; Rough surfaces; Surface acoustic waves; Surface roughness; Temperature sensors;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
