+91 9538798040
Bookmark and Share
 





Radio SAW - Sensors for Physical Parameters Measurement


M.F. Zhovnir[1], O.M. Kuzmenko[2], S.I. Pokutnyi[1a]
Page No. 7-13


Abstract

The schemas of wireless passive sensors on surface acoustic waves (SAW) for remote temperature
and humidity measurements are presented. Presented sensors constructions, comparatively with
existing analogues, allow to increase of measurement accuracy and to avoid a direct influence of
environmental factors on sensors surfaces. Principles of operation, according to presented schemas
sensors operation are described. The main constructive parameters of such sensors are given. The
dependence of signal reflective coefficient of output transducers, loaded on external sensitive
element, from impedance of external element is shown. With the help of presented sensor equivalent
circuit dependence of amplitude of reflective signal from impedance of external sensitive to
measuring physical quantity element is obtained.
Keywords: SAW sensor,temperature, humidity, thermistor, reflective coefficient.


Download complete article in pdf format