Proximity Sensors. Team 10. Facilitator- Dr. Wen Li Nolan Boyda Mark Holzhauer Jared Jones Eric Martz Justin Walz. Overview. Importance of Proximity Sensors Applications Common types Inductive Proximity Sensors Capacitive Proximity Sensors Resistive Proximity Sensors
Components of inductive sensor
Probe that uses oscillating LC circuit to sense changes in distance to the target
Driver electronics to convert amplitude changes to steady-state DC signal
Device that correlates DC signal to distance
How inductance relates to distance
Oscillator: Causes a pulsating magnetic field around the coil which is near the sensor head. Eddy currents circulate within target decreasing oscillator amplitude.
Demodulator : Acts as a positive peak detector to obtain a steady DC voltage from a sine wave input.
SchmidtTrigger : Forces rapid transitions between low and high voltage inputs
Output: Provides 0V to load when low, or a specific voltage correlating to the target distance when high.
No physical contact with objects
Very robust (can be fully encapsulated in resin)
No moving parts (long life)
Material must be electrically conductive
Automatic car wash
Digital Proximity Sensors (Induction)
Analog Proximity Sensors (Induction)
Automation Direct: AE9-10-1A
Sensing Distance: 0-4mm Analog Signal
Total length of part
Inside diameter of part
Depth of hole
Automation Direct: AE1-AP-1F