piezoelectric floating gate sensor team 3_files...facilitator: dr. fathi salem team members: ron...
TRANSCRIPT
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Piezoelectric Floating Gate
Sensor Design Team 1
Sponsors: MSU Technologies & National Science Foundation
Dr. Shantanu Chakrabartty
Facilitator: Dr. Fathi Salem
Team Members: Ron Razalan, Brett Johnson, Thamer Alshuaibi, Evan Gardetto, Yuval Levental
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Overview
• Head Impact Statistics
• Technical Comparison
• Piezoelectricity
• MSU Prototype
• Circuits Differences
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#14 Kyle Jefferson Takes a Big Hit - Michigan State @ Wisconsin
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Head Impact Statistics
• Brain Damage
• High level energy impulse
• Acceleration levels exceed 100g
• Ideas? Sensors utilize energy
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Tech Comparison
Riddell Helmet Sensor
Contemporary MSU
Complexity Significant Small
Cost $1000/helmet <$1
Power Battery Self-powered
Conclusion:
o expensive circuitry
o high energy → some shorted to ground
MSU Solution: Piezoelectric-sensor
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Piezoelectricity
• Piezo - piezein - greek: pressure
• Piezoelectricity: electromechanical
relationship in crystalline materials in
which pressure or physical strain induces
electrical charge
• Induced charge ∝ Strain magnitude
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How Piezoelectric Materials Work
• Apply force to piezoelectric membrane
• Deformity in the lattice structure: electron
flow creates electrical charge
• Harvested energy produces current
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MSU Prototype
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Sensor Power Circuit
Circuit Response to Impact
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Circuit with Time Dilation
Self-Powered Sensor with Time-Dilation
Measured Vout with and without Time Dilation
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Circuit with Time Dilation
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Data-Logging Circuit (DLC)
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Features
● Self-powered
● Power consumption << 1uW
● Requires no maintenance
● Small size
○ 0.5um CMOS fabrication
○ 1.5cm x 2cm
● Low cost
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Applications
● Kinesiology and Human Physiology
● Civil Architecture
● Mechanical Structure
● Automotive/Industrial
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Q & A