Eddy current flaw detector is a device based on the principle of eddy current detection to detect defects such as cracks and pores in steel bars and plates. It has the function of suppressing interference signals and picking up useful information. The instrument consists of an oscillator, probe coil, signal detection device, measurement comparison circuit, signal processing alarm display, and power supply. It is mainly used for non-destructive testing of metal materials.

The advantages of eddy current testing mainly include:

(1) Sensitivity to small cracks and other defects;
(2) Fast detection speed and high sensitivity for surface and near surface defects;
(3) The test results are immediate;
(4) Good equipment interface;
(5) Only a small amount of preparation is required;
(6) The testing probe does not need to come into contact with the tested object;
(7) Can inspect conductors with complex shapes and sizes.