System for interrogating a remotely interrogatable passive sensor integrated into a metal cavity with reduced system loss and interrogation method

摘要

A system comprises a cavity being reflecting for RF waves and comprises at least one acoustic wave sensor exhibiting a resonance frequency band, coupled to a sensor antenna; and an interrogation/reception device for the sensor. The interrogation/reception device comprises: means for transmitting/receiving an RF signal transmitting within an interrogation frequency band comprising the resonance frequency band of the sensor; at least a first transmission/reception antenna and a second transmission antenna/reception, positioned within the cavity; means for dividing the signal into at least a first RF signal and a second RF signal, the first signal being transmitted to the first transmission/reception antenna and the second signal being transmitted to the second transmission/reception antenna; means for creating a phase-shift between the first RF signal and the second RF signal; means for analysing the power level of the received signal. An interrogation method used in the system is also provided.

主权项

1. A system comprising:
a cavity being reflecting for RF waves and comprising at least one acoustic wave sensor exhibiting a resonance frequency band, coupled to one antenna, referred to as sensor antenna, and; a device for interrogation/reception of the said sensor, characterized in that the said interrogation/reception device comprising:
means for transmitting/receiving an RF signal transmitting within an interrogation frequency band comprising the said resonance frequency band for the said sensor;at least a first transmission/reception antenna and a second transmission antenna/reception, positioned within the said cavity;means for dividing the said signal into at least a first RF signal and a second RF signal, the said first signal being transmitted to the said first transmission/reception antenna and the said second signal being transmitted to the said second transmission/reception antenna;means for creating a phase-shift between the said first RF signal and the said second RF signal;means for analyzing the power level of the received signal.