Team 181 www.transtekinc.com Team: Ryan Williams (EE) Jonathan - - PowerPoint PPT Presentation

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

• 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
• utput voltage
• Linear relationship between core

position and output voltage

http://upload.wikimedia.org/wikipedia/commons/0/07/Lvdt_how.gif

http://upload.wikimedia.org/wikipedia/commons/5/57/LVDT.png www.transtekinc.com

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

• 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 October November December January February March April May 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

• Flexible PCB
• Microcontroller
• LVDTs
• Proto Board for experiments
• 0.7 inch tubing
• Component parts for the Ocillator/Demodulator
• Other Parts TBD