EMAT Testing devices
EMAT Ultrasonic technology: What is EMAT?, Features and Advantages
What is an EMAT?
EMAT means Electromagnetic Acoustic Transducer. It is a magnet, a wire, an air gap and a metal surface.
Features and advantages of an EMAT ultrasonic inspection
EMAT enjoys all the benefits of conventional ultrasonic inspection plus other particular advantages.
Ultrasound is generated in the part which is inspected.
1. Dry inspection - No couplant
- Easy to automate and integrate in production
- No couplant induced errors
- High inspection speeds (up to 60 m/s)
- Capable of high and sub-zero temperatures
2. Insensitive to surface conditions
- Capable of inspecting rough, dirty (oily / wet), oxidized or uneven surfaces
3. Easy probe deployment
- No signal variations from probe to probe
- Small changes in probe angle do not affect results (e.g. part curvature)
4. Unique wave modes
- Capable of generating horizontally polarized shear wave energy
- Highly efficient for guided waves due to frequency selectivity