Sensor for monitoring environmental parameters in concrete
US7551058B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2003 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Dec 10, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/226
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a sensor for monitoring an environmental parameter in concrete comprising an enclosure for embedding in concrete; a detecting means connected to the enclosure for detecting at least one environmental parameter in concrete, the detecting means comprising at least one capacitive element for measuring capacitive change; an active material connected to the enclosure, the active material being liable to respond to the environmental parameter and the active material being operably connected to the capacitive element; a RFID chip mounted within the enclosure, the RFID chip being operably connected to the detecting means; and an antenna operably connected to the RFID chip, the antenna being operably connected to the detecting means, and the antenna being part of an L-R-C circuit whose resonance frequency shifts within an assigned frequency band. The invention also provides a MEMS-based capacitor that responds to an environmental parameter in concrete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.