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Oscillator/Demodulator to Fit on Flexible PCB

Oscillator/Demodulator to Fit on Flexible PCB. Senior Design Team 181. www.transtekinc.com. Introduction. Team: Ryan Williams (EE) Jonathan Wolff (EE) Damon Soto (EE) Jason Meyer (EE) Advisor: Helena Silva (ECE) Trans- Tek Contacts: Mark Bennett Jeffrey Gladu. Outline.

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Oscillator/Demodulator to Fit on Flexible PCB

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  1. Oscillator/Demodulator to Fit on Flexible PCB Senior Design Team 181 www.transtekinc.com

  2. Introduction • Team: • Ryan Williams (EE) • Jonathan Wolff (EE) • Damon Soto (EE) • Jason Meyer (EE) • Advisor: Helena Silva (ECE) • Trans-Tek Contacts: • Mark Bennett • Jeffrey Gladu

  3. Outline • Trans-Tek Background • Linear Variable Differential Transformers (LVDTs) • Current Oscillator/Demodulator Models • Goals • Oscillator • Demodulator • Timeline • Budget

  4. Trans-Tek • 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

  5. LVDTs • 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

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

  7. Uses of LVDTs

  8. Oscillator/Demodulator Models • Model of Focus: • Series 1000 Oscillator/Demodulator • Issues: • Size • Digital Signal Processing (not used currently) • Re-Engineer • Using specifications provided to us by Trans-Tek • Size constraints, input/output and component hardware www.transtekinc.com

  9. Oscillator/Demodulator Models www.transtekinc.com

  10. Goals • Use Digital Signal Processing (DSP) preferred over hardware method. • Size Restraint: 0.700” DIAMETER TUBING, LENGTH T.B.D. • Series 1000 Oscillator Demodulator • Maintain accuracy and reliability • manipulate product dimensions • Oscillator: • maintain sinusoidal output, <1% harmonic distortion • Demodulator: • Maintain non-linearity <.03%

  11. 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. Oscillator http://www.electronics-tutorials.ws/oscillator/osc22.gif

  12. Demodulator • 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

  13. Demodulator Specifications • 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%)

  14. Timeline

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

  16. Budget • All required materials supplied by Trans-Tek • Need to buy: • Flexible PCB • Microcontroller/DSP • Component parts for proto-board and PCB • Total will amount to < $1000

  17. Questions?

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