A simple sensing mechanism for wireless, passive pressure sensors

We have developed a simple wireless pressure sensor that consists of only three electrically isolated components. Two conductive spirals are separated by a closed cell foam that deforms when exposed to changing pressures. This deformation changes the capacitance and thus the resonant frequency of th...

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Bibliographic Details
Main Authors: Drazan, John F., Wassick, Michael T., Dahle, Reena, Beardslee, Luke A., Cady, Nathaniel C., Ledet, Eric H.
Format: Conference Proceeding
Language:English
Subjects:
Capacitance
Coils
Inductance
Monitoring
Resonant frequency
Sensors
Wireless sensor networks
Online Access:Get full text
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Summary:We have developed a simple wireless pressure sensor that consists of only three electrically isolated components. Two conductive spirals are separated by a closed cell foam that deforms when exposed to changing pressures. This deformation changes the capacitance and thus the resonant frequency of the sensors. Prototype sensors were submerged and wirelessly interrogated while being exposed to physiologically relevant pressures from 10 to 130 mmHg. Sensors consistently exhibited a sensitivity of 4.35 kHz/mmHg which is sufficient for resolving physiologically relevant pressure changes in vivo. These simple sensors have the potential for in vivo pressure sensing.
ISSN:1557-170X
2694-0604
DOI:10.1109/EMBC.2016.7591090