eddy current

ECT Tools in the Field - New Tech and Capabilities

ONE REASON EDDY CURRENT IS A POPULAR NDT TECHNIQUE is that it does not require the removal of paint or protective coatings when testing.

Image Source: Eddyfi

ECT also doesn't require you to close down operations to test. Newer technologies, such as EddyFi's Sharck probes, feature tangential eddy current array (TECA) technology and are capable of positioning, measuring, and sizing cracks in carbon steels up to 7mm (0.28").

WITH TECHNOLOGY IMPROVING EACH DAY, ECT continues to provide accurate, non-invasive testing of assets under insulation.

What is Conductivity?

As relates to the ECT capacity, when it comes to conductivity, we are primarily focused on the electrons of the outermost shell of an atom. When an atom has 1-3 electrons in the outer shell, the material will conduct electricity when the atoms are pushed by voltage.

CERTAIN MATERIALS ARE BETTER CONDUCTORS THAN OTHERS. For instance, according to the International Annealed Copper Standard (IACS), copper is the perfect conductor. This is because pure copper has a base value of 100%. A base value of 100% makes it an ideal material that offers zero resistance and, therefore, is a pure conduit for electricity.

Eddy Current - What Is It? Where Is It Used?


ECT uses electromagnetic induction to detect and indicate surface and sub-surface flaws in conductive materials, including both ferromagnetic and non-ferromagnetic materials. It can also be used to detect coating thickness.

SPECIFIC APPLICATION AREAS INCLUDE in-service inspection of tubing at nuclear and fossil fuel power utilities, at chemical and petrochemical plants, on nuclear submarines, and in air conditioning systems. 

Here are some other areas where ECT comes in handy: 

  • Electromagnetic braking
  • Repulsive effects and levitation
  • Attractive elements
  • Identification of metals
  • Vibration and position sensing
  • Structural testing