1. Piezoelectric ceramic sensor
The piezoelectric ceramic sensor's primary operating mechanism is the positive piezoelectric effect. Because there is no case when the loop's input impedance is infinite after an external force is applied, the piezoelectric effect is used instead. Only dynamic or quasi-static stress can be measured and sensed by ceramic sensors. It is primarily used to measure different physical parameters, including changes in acceleration, pressure, and vibration. Piezoelectric ceramic sensors have been widely used as essential parts of numerous detection and control systems.
2. Capacitive sensor
Capacitive sensors use various types of capacitors as sensing elements to convert the measured physical or mechanical quantities into capacitance changes, which are actually capacitors with variable parameters. Capacitive sensors are widely used in the measurement of displacement, angle, vibration, speed, pressure, composition analysis, medium properties, etc. The most commonly used are parallel plate capacitors or cylindrical capacitors.
3. Magnetoelectric sensor
The magnetoelectric sensor uses the principle of electromagnetic induction to convert the input movement speed into the induced potential output in the coil. It directly converts the mechanical energy of the measured object into electrical signal output, and does not require an external power supply to work. It is a typical active sensor. Due to the large output power of this sensor, the secondary instrument circuit used is greatly simplified.
