Eddy Current Testing Concepts

Flashcards covering key concepts and terms related to eddy current testing.

Filtering

The process of applying certain measures to a received signal to enhance or modify its characteristics.

Eddy Currents

Electric currents induced within conductors by a changing magnetic field due to Faraday's law of induction.

Iron Core Probe

A type of probe that enhances the performance of eddy current testing by concentrating the magnetic field.

LPF (Low Pass Filter)

A filter that allows low frequencies to pass while reducing high-frequency noise.

Probe Shielding

The use of materials or methods to prevent external electrical interference and concentrate the magnetic field of a coil.

Conductivity Measurement

A testing process that determines how well a material can conduct an electric current.

Subsurface Flaws Detection

The process of identifying flaws located below the surface of a material.

Relative Permeability

The ratio of the permeability of a material to the permeability of free space; a unitless value.

HPF (High Pass Filter)

A filter that allows high frequencies to pass and attenuates low frequencies.

Pencil Probes

Probes with long slender housings designed for restricted space inspections.

Reference Standards

Materials or items used as benchmarks to calibrate testing equipment or validate inspection methods.

Skin Effect

The tendency of alternating current to distribute itself within a conductor so that the current density is largest near the surface.

High Frequency Impact on Eddy Currents

Higher frequencies lead to more effective shielding and less penetration depth.

Inductance

The property of an electrical conductor that causes it to oppose a change in current, measured in henries (H).

Depth of Penetration

The extent to which eddy currents can penetrate into a material, influenced by frequency and electrical properties.

Differential Probe

A probe type used for precise measurements when maintaining constant liftoff is critical.