RADFIT system
RFID
Temperature sensing
Technical data
Principle & properties
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The following basic components are required for a SAW sensor system:

• SAW-Sensor/RFID Transponder
• Antenna
• Reader

figure: SAW-principle

A SAW sensor/transponder consists of a piezoelectric substrate crystal where metal parts are mounted. An antenna enables the SAW sensor/transponder to communicate with the transmitter and reader by radio.

The reader emits an electromagnetic signal which is received by the transponder antenna. This signal is converted into mechanical oscillations by a special transducer located on the SAW sensor. The resultant waves spread over the surface of the piezoelectric crystal. When they reach the reflectors, the surface waves are partially reflected and converted back into electromagnetic waves. As the crystal expands or contracts depending on the temperature, this causes a change in the delay before the signal is received thus making temperature determination possible. In addition, a radio frequency identification (RFID) tag can be integrated.

CTR also provides development services for measuring the following physical parameters:
pressure, power, voltage, position, acceleration, flow, viscosity (liquids), density (liquids), electric field, conductivity (liquids), magnetic field, temperature and radiation dose.


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