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Questions and Answers
What is the primary material used in piezoelectric devices for motion sensing?
What is the primary material used in piezoelectric devices for motion sensing?
- Aluminum
- Copper
- PZT (correct)
- Steel
Capacitor plate sensors can detect movements above 0.4 Hz.
Capacitor plate sensors can detect movements above 0.4 Hz.
False (B)
What is the principle of operation of a capacitor plate sensor?
What is the principle of operation of a capacitor plate sensor?
The movement of the plate induces a phase difference at the phase sensitive detector, which is converted to a DC voltage output that depends on the position of the moving plate.
The capacitance of a capacitor plate sensor is inversely proportional to the ______________________.
The capacitance of a capacitor plate sensor is inversely proportional to the ______________________.
Match the following types of motion sensors with their applications:
Match the following types of motion sensors with their applications:
What is the main component of a capacitor plate sensor?
What is the main component of a capacitor plate sensor?
Inductive sensors can detect non-ferrous targets.
Inductive sensors can detect non-ferrous targets.
What is the advantage of ultra-flexible nanofiber-based multifunctional motion sensors?
What is the advantage of ultra-flexible nanofiber-based multifunctional motion sensors?
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Study Notes
Motion Sensors
- Capacitor plate sensor: consists of a moving plate attached to a moving object and fixed plates connected to a transformer supplied with AC voltage.
- Operation: movement of plate induces a phase difference at the phase sensitive detector, which is converted to a DC voltage output that depends on the position of the moving plate.
- Limitations: only works for movements 0.4 Hz for inactive, walking, and running states.
Types of Motion Sensors
- Inductive sensors
- LVDT accelerometer systems
- Rotation sensors
- Piezoelectric devices for motion sensing
- Hall effect based speed sensor
Piezoelectric Devices
- Material: PZT (high piezo charge constant, electromechanical coupling coefficient)
- Application: motion sensing
Advanced Motion Sensors
- Ultra-flexible nanofiber-based multifunctional motion sensor
Hall Effect Based Speed Sensors
- Applications:
- Detecting gears
- Detecting rack gears
- Detecting ferrous targets
- Detecting magnets
- Detecting multi-pole magnets
- Detecting die casting shot rods
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