WIRELESS SENSOR READER WITH MULTIPLE FIXED EXCITATION FREQUENCIES

Abstract

A wireless sensor reader configured to ascertain the resonance frequency of a sensor may comprise a transmit circuit configured to transmit a wireless energizing pulse at a transmit frequency to the sensor, exciting a resonant circuit within the sensor to resonance at a frequency proportional to a measured parameter and a receiver circuit configured to receive a response signal from the sensor, the response signal being a continuous wave at the sensor resonance frequency. The wireless sensor reader may also comprise a circuit for determining the frequency of the sensor response signal, where the reader selects the transmit frequency of the energizing pulse from a plurality of discrete narrowband frequencies, the selection taking place before the determination of the frequency of the sensor response signal.

CPC Classifications