How the Vibration Sensor Works

There are many kinds of vibration sensors. According to different working principles, they can be divided into eddy current vibration sensors, inductive vibration sensors, capacitive vibration sensors, piezoelectric vibration sensors and resistance strain vibration sensors. The following are the working principles of these vibration sensors and application.

1. Eddy current vibration sensor

The eddy current vibration sensor is a vibration sensor based on the eddy current effect. It belongs to the non-contact sensor. The eddy current vibration sensor measures the vibration parameters of the object through the change of the distance between the sensor end and the measured object. The eddy current vibration sensor Mainly used to measure vibration displacement.

2. Inductive vibration sensor

The inductive vibration sensor is a vibration sensor designed according to the principle of electromagnetic induction. The inductive vibration sensor has a magnet and a magnetic conductor. When measuring the vibration of an object, the mechanical vibration parameters can be converted into electrical parameter signals. The inductive vibration sensor can be used to measure vibration speed, acceleration and other parameters.

3. Capacitive vibration sensor

Capacitive vibration sensors obtain variable capacitance by changing the gap or common area, and then measure the capacitance to obtain mechanical vibration parameters. Capacitive vibration sensors can be divided into variable gap type and variable common area type. The former can be used to measure linear vibration displacement , the latter can be used to measure the angular displacement of torsional vibration.

4. Piezoelectric vibration sensor

The piezoelectric vibration sensor uses the piezoelectric effect of the crystal to complete the vibration measurement. When the vibration of the measured object forms a pressure on the piezoelectric vibration sensor, the crystal element will generate a corresponding charge, and the charge number can be converted into a vibration parameter. The piezoelectric vibration sensor It can be divided into piezoelectric acceleration sensor, piezoelectric force sensor and impedance head.

5. Resistive strain vibration sensor

The resistance strain vibration sensor is a vibration sensor that expresses the mechanical vibration of the measured object through the change of resistance. There are many ways to realize the resistance strain vibration sensor, which can be applied to various sensing elements, among which the resistance strain vibration sensor more common