Senior Design
Team 181
www.transtekinc.com
Team:
• Ryan Williams (EE)
• Jonathan Wolff (EE)
• Damon Soto (EE)
• Jason Meyer (EE)
Advisor: Helena Silva (ECE)
Trans-Tek Contacts:
• Mark Bennett
• Jeffrey Gladu
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Trans-Tek Background
Linear Variable Differential Transformers (LVDTs)
Current Oscillator/Demodulator Models
Goals
Oscillator
Demodulator
Timeline
Budget
• Founded in 1967
• Located in Ellington, CT
• Leading manufacturer of Linear and Angular
Displacement, and Linear Velocity Transducers
• Use Linear Variable Differential Transformers
(LVDTs)
• Applications in position and velocity sensing
• Consists of a 3-part transformer
• Secondary coils wired in
subtractive configuration
• Position of core determines
output voltage
• Linear relationship between core
position and output voltage
http://upload.wikimedia.org/wikipedia/commons/0/07/Lvdt_how.gif
www.transtekinc.com
http://upload.wikimedia.org/wikipedia/commons/5/57/LVDT.png
www.transtekinc.com
www.transtekinc.com
• Hardware circuit that converts a DC
signal to an AC signal.
• Frequency of the oscillator is
determined by a RC combination,
looking for a range of 1.5 to 12.5 kHz.
• Output voltage determined by a
resistor, looking for 1 to 6 VRMS.
• Need to make an oscillator with
almost no harmonic distortion.
http://www.electronics-tutorials.ws/oscillator/osc22.gif
• Can be performed using a hardware
circuit or DSP
• Hardware Circuit
• No coding required
• Same process used in current
models
• DSP
• Easier to modify and tune
• More accurate
• No circuit components needed
http://www.singer-instruments.com/sites/default/files/images/tutorials/how_lvdt_works_fig3.gif
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Input impedance of 1MΩ or higher
4 separate selectable output ranges
Ripple voltage less than 0.2%
Non-linearity less than 0.03%
Temperature coefficient best effort (± 1%)
September
Meet with Sponsor
Project Statement
Project Specs
Proposal Presentations
Research Parts
Written Proposal
Schematic
Order Parts
Protoboard Build
Final Presentation
Final Report
Debug
PCB Build
October
November
December
January
February
March
April
May
•Flexible PCB
•Microcontroller
•LVDTs
•Proto Board for experiments
• 0.7 inch tubing
•Component parts for the Ocillator/Demodulator
•Other Parts TBD