Delft University of Technology Low-cost Capacitive Personnel Detector R.N. Aguilar,, M. Roelofsz, H. Kerkvliet, R. van de Ven, G.C.M. Meijer Electrical Instrumentation Laboratory, Microelectronic Department, Delft University of Technology, The Netherlands

Delft University of Technology Contents Introduction: Tracking s ystems Capacitive sensing Electrode overview Two-port technique Three-signal technique Implementation Conclusion

Delft University of Technology Sensing technique ? Tracking

Delft University of Technology Sensing technique

Delft University of Technology Capacitive sensing high dielectric constant ! H D

Delft University of Technology Electrode overview

Delft University of Technology Two-port technique

Delft University of Technology Two-port technique …

Delft University of Technology Three-Signal Technique

Delft University of Technology Three-Signal Technique …

Delft University of Technology Micro- controller Electrodes Control Lines Universal Transducer Interface (UTI) Switches and Buffers Control Lines Display Signal-Processing Circuit Implementation

Delft University of Technology Implementation … STD=0.001pF Res=10bit

Delft University of Technology Thank You