Wirelessly interrogable surface acoustic wave sensors for vehicular applications

Author

Pohl, Alfred ; Seifert, Franz

Author_Institution

Appl. Electron. Lab., Univ. of Technol., Wien, Austria

Volume

46

Issue

4

fYear

1997

fDate

8/1/1997 12:00:00 AM

Firstpage

1031

Lastpage

1038

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;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.650822

Filename

650822