시험체 내에 유도된 와전류가 재료의 특성이나 결함 등에 의해 변화되는 현상을 이용하여 와전류 탐상은 여러분야의 검사에 이용되고 있다.
검사 분야 와전류 영향인자 적용 대상
1. 결함 탐상검사 결함(크기, 형상, 위치 등) 철, 비철재료의 관, 선, 봉, 판 등
2. 재질 검사 1) 전도도의 변화
2) 투자율의 변화		 비철재료
철강재료
3. 피막두께 측정 1) 도체, 코일간의 거리변화
2) 두께변화, 피막두께		 금속표면상의 피막두께
4. 치수 검사 치수, 형상 등의 변화 비철, 철강재료

장점 단점
1. 비접촉법으로 시험속도가 빠르며 자동화가 가능하다. 1. 두꺼운 재료의 내부검사가 어렵다..
2. 고온, 고압과 같은 악조건 하에서 탐상이 가능하다 2. 결함의 종류 및 형상판별이 곤란하다.
3. 표면결함의 검출능력이 우수하다.
4. 유지비가 저렴하고 시험결과의 기록보존이 가능하다.



 As shown in Figure 1(A), the flow in the coil around the magnetic coils every moment occurs and also, as shown in Figure 1 (b) by the magnetic field around the conductor could induce the formation of the EMF, and therefore in Figure 1 (c) Eddy Current testing with coil current is used every moment, and this magnetic field is formed by the changes in the magnetic field surrounding the formation of EMF induced in the conductor. The magnetic flux passing through the coil.

Likewise, any change in the magnetic flux through the coil, a magnetic conductor within any movement made, or when changes in the current flowing through the circuit to prevent a change in the local conductor on the current arbitrary a closed circuit current to the Eddy Current, which is organic this Eddy Current 

In other words, Eddy current is time for a change in current in the magnetic field formed by the conductor says. That is formed when

The size of Eddy Current conductor of the shape, size, electrical conductivity, transmissivity, depending on the changing magnetic flux in a very time

Aspect of a complex arrangements.


When the electricity flow in the test coil in eddy current conductor is formed already knew that. The eddy current in the opposite direction of the generated magnetic field to form another coil impedance changes, causing them to the test. It's like when using AC power circuit ran impedance of the DC resistance and acts like that. If and when the defect is in the 10001 conductor coil impedance test to measure the change differently, so that it can find materials flaws, and also changes in the electrical conductivity and impedance transmissivity such as changes in the physical properties of materials change, and that therefore do changing to measure the physical properties of materials will be known.