ET Course Outline

The following is typical of the topics taught for ET.  All course outlines can be, and usually are, modified to meet client needs.

Introduction to Electromagnetic Testing (ET)

NDT Training and Certification Requirements

History of Eddy Current Inspection 

Present State of Eddy Current Inspection 

Applications

Advantages

Limitations

Physics of Eddy Current Inspection

Fundamentals of Electricity

AC Current Principles

Resistance 

Inductance 

Mutual Inductance

Self Inductance

Inductive Reactance

Skin Depth

Impedance

Complex Impedance Plane

Generation of Eddy Currents

Characteristics of eddy currents

Variables which affect Coil Impedance

Instrumentation

Circuits

Resonate Circuits

Amplitude Analysis

Bridges

Display - Impedance Plane

Display - Analog Meter

Display - Digital Meter (Conductivity)

Display - Strip Charts

Probes & Applications 

Surface (Breaking) Cracks

Corrosion

Material Sorting (Conductivity)

Thin Layer Material (Conducting)

Thin Layer Material (Non-Conducting)

Crack Detection (Reflection)

Differential-vs-Absolute

Reference Standards

Types and uses

Interpretation and Evaluation of ET Signals

Impedance Plane Display and Analysis

Phase analysis

Coil (Probe) Design 

Diameter

Turns

Impedance Matching

Shielding

Advanced Techniques

Scanning

Pulsed Eddy Current

Swept Frequency

Remote Field (Signal Processing)

ECSIM         

User Specification and Operating Procedures

Formulae & References 

EC Formulae

References