Remote acoustic wave sensors
US4265124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1979 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Jun 4, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is an acoustic wave sensor, including an acoustic wave oscillator having a resonant frequency which is modulated according to changes in a physical variable and a broadcast amplifier for directly transmitting the modulated frequency as a radio frequency signal. As a surface acoustic wave pressure sensor, the sensor includes a housing defining a cavity therein, an opening in the housing communicating with the cavity, a surface acoustic wave transducer attached to the housing to close the opening and adapted to deflect in response to a pressure differential across the transducer, an amplifier coupled to the transducer in a feedback loop, the transducer thereby being adapted to modulate the resonant frequency of the loop in response to the deflection, and a broadcast amplifier for directly transmitting the modulated frequency as a radio frequency signal. As a Stoneley acoustic wave pressure sensor, the sensor includes a housing defining a cavity therein, an opening in the housing communicating with the cavity, a Stoneley acoustic wave transducer attached to the housing to close the opening and adapted to deflect in response to a dynamic pressure differential across the trans…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.