Beam Pattern and Interference

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Presentation transcript:

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

Inductive Proximity Sensors

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

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

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

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)

Bowl Feeders

Bowl Feeders

Bowl Feeders

Bowl Feeders

Bowl Feeders

Bowl Feeders Design Factors Part symmetry Selector efficiency E=Fo/Fi Recirculation effects See Asfahl (Robots and Manufacturing Automation) p.71-75