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Touch Sensing via Time Domain Reflectometry: Advances and Applications

This project explores the innovative use of Time Domain Reflectometry (TDR) in touch sensing technology. It covers essential aspects such as hardware configurations, signal analysis techniques, and diverse applications in fields like agricultural sensing and circuit board analysis. Key stages include signal acquisition using Tektronix 1502, motion smoothing through advanced filtering, and effective mapping for practical applications. The project discusses prototypes, challenges like noise and interference, and opportunities for enhancing resolution in touch sensing systems.

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Touch Sensing via Time Domain Reflectometry: Advances and Applications

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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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