System for interrogating a remotely interrogatable passive sensor integrated into a metal cavity with reduced system loss and interrogation method
US9405949B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2014 |
| Grant date | Aug 2, 2016 |
| Priority date | — |
| Expiry date | Jan 19, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/75
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.