PR6423/00R-11+CON041 Eddy Current Signal Converter

Eddy current sensor equipment is a kind of measuring equipment based on eddy current effect. When the

eddy current sensor is close to the target object, the target object will generate eddy currents, which will cause

changes in the magnetic field in the sensor. By measuring these magnetic field changes, eddy current

sensors can achieve non-contact measurement of the target object.

Eddy current sensors can measure a wide range of parameters, including fluid speed, flow and temperature, etc.,

can also be used to detect defects on the surface of metal conductors, such as cracks, holes, scratches,

etc., and measure physical parameters of metal conductors, such as conductor thickness, electrical conductivity and permeability.

Eddy current sensors are widely used in many fields because of their high precision, fast response and no wear.

For example, in the automotive industry, eddy current sensors can be used to measure the degree of wear and

roundness of the brake disc, the speed of the wheel, etc. In industries such as aviation, aerospace and metal

processing, eddy current sensors can be used in the field of non-destructive testing to detect defects, cracks and

corrosion of materials; In robot control system, eddy current sensor can be used for position feedback control of objects.

In summary, eddy current sensor equipment is a powerful and widely used measurement tool, which is of

great significance for various fields of industrial and scientific research.

PR6423/00R-11+CON041

The principle of eddy current sensor is based on Faraday’s law of electromagnetic induction and eddy

current effect. Specifically, when the eddy current sensor is near a metal conductor, an exciting coil inside

it generates an alternating magnetic field. This alternating magnetic field induces eddy currents on the

surface of the metal conductor, that is, free electrons in the metal conductor are affected by the magnetic field, forming a closed current ring.

These eddies produce a magnetic field in the opposite direction of the excitation field, known as a

reverse electromagnetic field. The intensity of the reverse electromagnetic field is related to the conductivity

and permeability of the metal conductor, the distance from the sensor and the frequency of the exciting magnetic field.

The detection coil in the eddy current sensor measures the change in this reverse electromagnetic field.

When the distance between the metal conductor and the sensor changes, the strength of the reverse

electromagnetic field also changes accordingly, resulting in a change in voltage or impedance in the detection

coil. By accurately measuring and analyzing these changes, eddy current sensors can realize non-contact measurement of metal conductors.