Micropower peak strain detection system for remote interrogation
US6622567B1 · kind B1 · utility
205Cited by
7References
52Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2001 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Mar 7, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensing device includes an RFID chip and a differential variable reluctance transducer (DVRT) sensor that can be read remotely with electromagnetic power provided to the device from a remote reader. The ac signal provided to the device by inductance is used for powering the RFID chip and exciting the sensor. Data read from the sensor can also be transmitted back to the reader using the power provided by the reader. The sensor circuit uses a lower amount of current than the RFID chip, so it does not contribute appreciably to device power requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.