There are various types 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 and uses of these types of vibration sensors.

 

Working principles and uses of several vibration sensors

 

1.Eddy current vibration sensor

 

Eddy current type vibration sensor is a vibration type sensor whose working principle is eddy current effect. It belongs to non-contact type sensor. The eddy current vibration sensor measures the vibration parameters of an object by changing the distance between the end of the sensor and the measured object. Eddy current vibration sensors are mainly used for measuring vibration displacement.

 

2.Inductive vibration sensor

 

Inductive vibration sensor is a vibration sensor designed according to the principle of electromagnetic induction. The inductive vibration sensor is provided with a magnet and a guide magnet. When an object is subjected to vibration measurement, it can convert mechanical vibration parameters into electrical parameter signals. Inductive vibration sensors can be used to measure vibration speed, acceleration and other parameters.

 

Working principles and uses of several vibration sensors

 

3.Capacitive vibration sensor

 

Capacitive vibration sensors obtain variable capacitance by changing the gap or the common area, and then measuring the capacitance to obtain the mechanical vibration parameters. Capacitive vibration sensors can be divided into two types: variable gap type and variable common area type. The former can be used to measure linear vibration displacement, and the latter can be used to measure 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 puts pressure on the piezoelectric vibration sensor, the crystal element will generate a corresponding charge, and the number of charges can be converted into vibration. parameter. Piezoelectric vibration sensors can also be divided into piezoelectric acceleration sensors, piezoelectric force sensors, and impedance heads.

 

5, resistance strain type vibration sensor

 

The resistance strain vibration sensor is a vibration sensor that expresses the mechanical vibration of the measured object by the change of resistance. There are many ways to implement resistance strain type vibration sensors, and various sensing elements can be applied, the most common of which is resistance strain.