Types of Vibration Sensors

What are the types of vibration sensors

1. Relative vibration sensor

According to the principle of electromagnetic induction, when a moving conductor cuts the magnetic force line in a fixed magnetic field, the two ends of the conductor will induce an electromotive force. Therefore, the sensor produced by this principle is called an electric sensor.

2. Eddy current vibration sensor

The eddy current sensor is a relatively non-contact sensor. It measures the vibration displacement or amplitude current of the object by changing the distance between the end of the sensor and the measured object.

3. Inductive vibration sensor

According to the relative mechanical receiving principle of the sensor, the inductive sensor converts the change of the measured mechanical vibration parameter into the change of the electrical parameter signal. Therefore, the inductive sensor has two forms, one is a variable gap, and the other is a variable Permeable area.

4. Capacitive vibration sensor

Capacitive sensors are generally divided into 2 types. The variable gap type can be used to measure the displacement of linear vibration, and the variable area type can be used to measure the angular displacement of torsional vibration.

5. Inertial vibration sensor

The inertial electric sensor is composed of a fixed piece and a supporting spring. In order to make the sensor work in the state of a displacement sensor, the stiffness of the supporting spring should be small enough, that is, the sensor has a sufficiently low natural frequency.

6. Piezoelectric vibration sensor

The piezoelectric type uses the positive piezoelectric effect of piezoelectric crystals. The principle is artificially polarized ceramics, piezoelectric quartz crystals, etc. Different piezoelectric materials have different piezoelectric coefficients. Therefore, the piezoelectric effect of crystals can be used to create force Sensor. In vibration measurement, since the force on the piezoelectric crystal is the inertial force involved in the inertial mass, the number of charges generated is proportional to the magnitude of the acceleration, so the piezoelectric sensor belongs to the acceleration sensor.