Parallel-plate capacitive element for monitoring environmental parameters in concrete
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United States of America Patent
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May 2, 2006
Issued Date -
N/A
app pub date -
Jun 28, 2004
filing date -
Dec 10, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a sensor for monitoring an environmental parameter in concrete including an enclosure; a detecting device connected to the enclosure for a detecting at least one environmental parameter in concrete, wherein the detecting device includes at least one capacitive element; an active material connected to the enclosure, wherein the active material is liable to respond to the environmental parameter and is operably connected to the capacitive element; a RFID chip mounted within the enclosure and operably connected to the detecting device; and an antenna operably connected to the RFID chip and the detecting device, wherein the antenna is part of an L-R-C circuit whose resonance frequency shifts within an assigned frequency band. The invention also provides a MEMS-based capacitive element that responds to an environmental parameter in concrete. The invention further provides a method of forming a MEMS-based capacitive element.
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