projektarbeit: touch sensing with time domain reflectometry
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Projektarbeit: Touch Sensing with
Time Domain Reflectometry
Markus ZimmermannBetreuer: Raphael Wimmer
Outline
• Introduction• Hardware• Signal Analysis• Applications• Demonstration• Discussion
Introduction: Time Domain Reflectometry
Reflections
• Termination• Capacitive / Resistive / Inductive
Present usage
• Wiring maintainance (communication, aaviation)
• Agricultural and geotechnical (humidity, ...)• Semiconductor/circuit board analysis• New Approach: Touch Sensing
Hardware: Tektronix 1502
• Characteristics
Signal Analysis
• Acquisition• Filter• Motion Smoothing• Calibration• Detection• Mapping
Stage 1: Acquisition
• Camera• OpenCV
Stage 2: Filter
• Averaging in Frequency Domain
Convolution / FFT
• Explanation of Convolution Filtering
Stage 3: Motion Smoothing
• Stability depends on Alteration, Gradient
Stage 4: Calibration
• Thresholds, Gradients
Stage 5: Detection
Stage 4: Mapping
Applications
„Wire“
„Snake“
„Fractal“
Applications: Outlook
• Wiring 3D Objects• ITO evaporation
Demonstration
• Video
Discussion
• Prototyping Technique• Noisy• HF interferences• Increasing Resolution
Conclusion
?