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Self contained surface acoustic wave temperature sensor
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Abstract
En 中文
A novel self-contained surface acoustic wave (SAW) temperature sensor is introduced. The sensor's device is completely passive and operates with no battery or wiring. In contrast to conventional SAW sensor systems, this sensor type does not reflect radar queries but generates its own RF signals to transmit ID-code and sensor information to a sensor base station. The striking feature of the novel sensor element is that the energy needed for sensing and signal generation is provided by the temperature change of the sensed process itself. Efficient energy conversion is obtained by using a pyroelectric crystal in combination with a spark gap The generated RF power is sufficient to obtain readout distances up to 200 m. The temperature measurement accuracy is better than 1 degreesK for a range from -20 degreesC to +150 degreesC even without sensor calibration, The mentioned features of the novel sensor allow numerous innovative applications in the industrial, automotive or household area.