Eddy current testing (ECT) is an electromagnetic testing technique used to inspect non-ferromagnetic materials, and eddy current array (ECA) is an advanced form of ECT that allows efficient scanning over larger areas. Eddy currents are typically used to detect cracks, measure paint and coating thickness, and find flaws in welds, tubes, and plates. However, this nondestructive testing (NDT) technique is also ideal for some unique inspection applications that you may not have considered before.
The high thermal conductivity and stability of graphite makes it a material of choice for the dissipation of heat in advanced electronics components. However, its good thermal performance is highly dependent on the uniformity of its surface. Surface flaws such as cracks, holes or wrinkles will block the propagation of heat through graphite and can drastically lower its efficiency. Unfortunately, visual inspection often misses these small surface defects and lacks the capability to detect internal flaws in multilayer graphite assemblies.