DEVICE FOR INTERROGATING A PASSIVE SENSOR OF THE SURFACE ACOUSTIC-WAVE TYPE

摘要

The invention relates to a device for remotely interrogating the resonance frequencies of a passive sensor, said device comprising means for transmitting an interrogation signal at a plurality of frequencies to said passive sensor, means for receiving a signal including the resonance frequencies of the passive sensor, means for analysing said frequencies, wherein the transmission signal is a continuous signal, and further comprising a demodulator and a low-pass filter for selecting a band of frequencies centred on the resonance frequency of the passive sensor.