Eddy Current Displacement Sensor

Sensor Product details

By measuring the relative position of the subject and the probe end, the eddy current displacement sensor is inducted and processed into the corresponding electrical signal output. Sensors can be long time and reliable work, high sensitivity, strong anti-jamming capability, non-contact measurement, fast response speed is not affected by water medium.Widely used for the shaft displacement, shaft vibration and spindle speed of the large rotating machinery real-time monitor.

Sensor Working Principle

The principle of eddy current sensor system is eddy current effect,It belongs to the principle of inductive measurement.The eddy current effect results from the energy of the oscillating circuit. On the other hand, The eddies need to be formed in conductive material. An alternating current is introduced into the coil inside the sensor probe, which forms a magnetic field around the coil. If a conductor is placed in this magnetic field, According to the Faraday's law of electromagnetic induction,Then there will excites an eddy current inside the conductor. According to lenz's law, the magnetic field of the eddy current is opposite to that of the coil, which changes the impedance of the coil inside the probe. This impedance change is directly related to the distance between the coil and the measured object. After the sensor probe is connected to the controller, the controller can obtain the change of voltage value from the sensor probe and calculate the corresponding distance value based on this. The eddy current measurement principle can measure all conductive materials.
Because the eddy current can penetrate the insulator, even the metal material covered with the insulator,it also can be used as the measured object of the eddy current sensor. The unique coil winding design not only realizes the extremely compact shape of the sensor, but also meets the requirements of its operation in the high-temperature measurement environment.

Sensor Application

By measuring the relative position of the subject and the probe end, the eddy current displacement sensor is inducted and processed into the corresponding electrical signal output. Sensors can be long time and reliable work, high sensitivity, strong anti-jamming capability, non-contact measurement, fast response speed is not affected by water medium.Widely used for the shaft displacement, shaft vibration and spindle speed of the large rotating machinery real-time monitor.The eddy current displacement sensor is also extended to the satellite launch, material identification, weighing, metal thickness measurement, material shape variables etc.

Sensor Product Specification

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