Motion Sensors Chapter 3 PDF

Motion sensors  Capacitor plate sensor Inductive sensors LVDT accelerometer systems Rotation sensors Piezoelectric devices for motion sensing Hall effect based speed sensor  Simplest form: Moving plate attached to moving object Fixed plates connected to a transformer...

Motion sensors  Capacitor plate sensor Inductive sensors LVDT accelerometer systems Rotation sensors Piezoelectric devices for motion sensing Hall effect based speed sensor  Simplest form: Moving plate attached to moving object Fixed plates connected to a transformer Transformer supplied with AC voltage Enables a phase difference in voltage to be had b.w the capacitive voltage at the moving plate and that at the centre tap of the transformer winding Operation: Transformer supplied with AC voltage Movement of plate induces a phase difference at the phase sensitive detector PHASE DIFFERENCE is converted to a DC voltage output that depends on the position of the moving plate Limitations: Since capacitance is inversely proportional to separation, this sensor works only for movements 0.4 Hz for inactive, walking and running states Matl: PZT High piezo charge constant, electromechanical coupling coefficient Ultra-flexible nanofiber-based multifunctional motion sensor  Capacitor plate sensor Inductive sensors LVDT accelerometer systems Rotation sensors Piezoelectric devices for motion sensing Hall effect based speed sensor Speed sensors for detecting gears Speed sensors for detecting rack gears Speed sensors for detecting ferrous targets Speed sensors for detecting magnets Speed sensors for detecting multi-pole magnets Speed sensors for detecting die casting shot rods