Eddy Current Testing

Introduction

• NDT and Eddy Current Testing
• Basic Principles of Eddy Current Inspection
• History of Eddy Current Testing
• Present State of Eddy Current Inspection

Instrumentation

• Eddy Current Instruments
• Resonant Circuits
• Bridges
• Complex Impedance Plane: Eddy Current Scope
• Analog Meter

Probe/Coil Design

• Mode of Operation
• Configurations
• Shielding and Loading
• Coil Design
• Impedance Matching

Procedure Issues

• Reference Standards
• Signal Filtering
• Phase Lag

Applications

• Surface Breaking Cracks
• Surface Crack Detection Using Sliding Probes
• Tube Inspection
• Conductivity Measurements
• Conductivity Measurements for the Verification of Heat Treatment
• Thickness Measurements of Thin Material
• Thickness Measurements of Nonconducting Coatings on Conductive Materials

Advanced Techniques

• Scanning
• Multiple Frequency Techniques
• Swept Frequency
• Pulsed Eddy Current Inspection
• Background on Pulsed Eddy Current
• Remote Field Sensing

Tables and Formulae

• Eddy Current Inspection Formulas
• Eddy Current Standards and Methods
• Electrical Conductivity and Resistivity for Aluminum and Aluminum Alloys
• Electrical Conductivity and Resistivity for Copper and Copper Alloys
• Electrical Conductivity and Resistivity for Iron and Iron-Based Alloys
• Electrical Conductivity and Resistivity for Magnesium and Magnesium Alloys
• Electrical Conductivity and Resistivity for Nickel and Nickel Alloys
• Electrical Conductivity and Resistivity for Titanium and Titanium Alloys
• Electrical Conductivity and Resistivity for Misc. Materials and Alloys

Quiz

• Eddy Current Testing Quiz