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Beam Pattern and Interference

Beam Pattern and Interference. Modulation helps against ambient light Adjacent photo sensors may still interfere!. Magnetic Position Sensors. Reed switches (sense permanent magnet) Inductive proximity sensors (eddy current) Hall Sensors (sense permanent magnet). Inductive Proximity Sensor.

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Beam Pattern and Interference

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  1. Beam Pattern and Interference • Modulation helps against ambient light • Adjacent photo sensors may still interfere!

  2. Magnetic Position Sensors • Reed switches (sense permanent magnet) • Inductive proximity sensors (eddy current) • Hall Sensors (sense permanent magnet)

  3. Inductive Proximity Sensor

  4. Inductive Proximity Sensors

  5. Hall Sensors • Hall effect: • constant voltage forces a constant current in semiconductor sheet • magnetic field flux lines perpendicular to current cause proportional voltage across sheet. • discovered by E.F.Hall in 1879 • Linear sensor needs voltage regulator and amplifier • Switch also needs threshold circuit, with hysteresis

  6. Hall Switch • Magnet motion • head-on • bypass or slide-by • Total effective air gap (TEAG) • Sensitivity, Hysteresis, & Temperature

  7. Other Discrete Position Sensors • capacitive • ultrasonic • variable reluctance (coil around magnet, senses moving ferrous material)

  8. Care & Feeding of Machines • Feeding parts • vibratory feed bowls • conveyors • pick & place • Material obtained from: • Boothroyd, Automatic Assembly • Ken Goldberg, UCB Industrial Engr Oper. Rsrch (http://www.ieor.berkeley.edu/~goldberg/index.html) • Robert-Paul Berretty, PhD thesis, Utrecht (http://www.library.uu.nl/digiarchief/dip/diss/1940512/full.pdf)

  9. Bowl Feeders

  10. Bowl Feeders

  11. Bowl Feeders

  12. Bowl Feeders

  13. Bowl Feeders

  14. Bowl Feeders • Design Factors • Part symmetry • Selector efficiency E=Fo/Fi • Recirculation effects

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