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Projektarbeit: Touch Sensing with Time Domain Reflectometry

Projektarbeit: Touch Sensing with Time Domain Reflectometry. Markus Zimmermann Betreuer: Raphael Wimmer. Outline. Introduction Hardware Signal Analysis Applications Demonstration Discussion. Introduction : Time Domain Reflectometry. Reflections. Termination

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Projektarbeit: Touch Sensing with Time Domain Reflectometry

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  1. Projektarbeit: Touch SensingwithTime Domain Reflectometry Markus Zimmermann Betreuer: Raphael Wimmer

  2. Outline • Introduction • Hardware • Signal Analysis • Applications • Demonstration • Discussion

  3. Introduction: Time Domain Reflectometry

  4. Reflections • Termination • Capacitive / Resistive / Inductive

  5. Presentusage • Wiringmaintainance (communication, aaviation) • Agricultural and geotechnical (humidity, ...) • Semiconductor/circuitboardanalysis • New Approach: Touch Sensing

  6. Hardware: Tektronix 1502 • Characteristics

  7. Signal Analysis • Acquisition • Filter • Motion Smoothing • Calibration • Detection • Mapping

  8. Stage 1: Acquisition • Camera • OpenCV

  9. Stage 2: Filter • Averaging in Frequency Domain

  10. Convolution / FFT • Explanation of ConvolutionFiltering

  11. Stage 3: Motion Smoothing • Stabilitydepends on Alteration, Gradient

  12. Stage 4: Calibration • Thresholds, Gradients

  13. Stage 5: Detection

  14. Stage 4: Mapping

  15. Applications

  16. „Wire“

  17. „Snake“

  18. „Fractal“

  19. Applications: Outlook • Wiring 3D Objects • ITO evaporation

  20. Demonstration • Video

  21. Discussion • PrototypingTechnique • Noisy • HF interferences • Increasing Resolution

  22. Conclusion

  23. ?

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