Sensor for monitoring environmental parameters in concrete

Details Sensor for monitoring environmental parameters in concrete Sensor for monitoring environmental parameters in concrete

2003-12-10

2009-06-23

Edwards, Jr., Timothy (Department: 2612)

Communications: electrical

Selective

Interrogation response

C340S665000, C709S213000

Reexamination Certificate

active

07551058

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.

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