The eddy current flaw detector can adapt to the testing requirements of a variety of different metal materials, and because of the fully digital design, multiple standard testing procedures or expert systems can be established in the instrument, which is convenient for users to call when changing product specifications. It is equipped with input, The output control interface facilitates the connection of the inspection site with various eddy current inspection equipment and works synchronously to form a highly automated whole. It can pass two inspections once and achieve double insurance for product quality.
There are many factors that affect the eddy current field, such as the degree of coupling between the probe coil and the measured material, the shape and size of the material, electrical conductivity, magnetic permeability, and defects, etc. Therefore, the principle of the eddy current flaw detector can be used to solve the problems of flaw detection, thickness measurement, and sorting of metal materials.
Eddy current is the induced current, which flows in a loop. It is called "vortex" because it is the same as the form of liquid or gas flowing in a loop around obstacles.
If a conductor is placed in the changing magnetic field, eddy current will be generated in that conductor, and the eddy current will also generate its own magnetic field, which expands as the alternating current rises and disappears as the alternating current decreases.
Therefore, when defects appear on or near the surface of the conductor or some properties of the measured metal material change, the intensity and distribution of the eddy current will be affected.
1. Sensitivity to small cracks and other defects.
2. Detection of surface and near-surface defects is fast and sensitive.
3. The test results are immediate.
4. The eddy current testing equipment has good interface.
5. Only a small amount of preparatory work is required.
6. The test probe does not need to touch the object under test.
7. It can inspect conductors with complex shapes and sizes.
Therefore, we can detect the change of eddy current through the instrument, and then we can indirectly know the existence of defects on the outer surface of the conductor and whether the metal properties have changed.