Electromagnetic acoustic transducer (EMAT) instruments generate ultrasound directly inside the test object — no couplant required. An EMAT probe creates high-frequency eddy currents that interact with a magnetic field, producing ultrasonic waves in the metal through the Lorentz force or magnetostriction. Because sound is generated within the material itself, EMAT testing works through coatings, rust, and surface contamination, and handles components too hot, too cold, or too rough for conventional piezoelectric probes.
Typical applications include wall-thickness measurement of boiler tubes and heat exchangers, corrosion inspection of pipelines and storage tanks, and both manual and automated testing. Pulse-echo and through-transmission modes cover thickness gauging and flaw detection alike.
Delta Test Technologies offers the A1270 EMAT thickness gauge with innovative pulse-magnetization technology for couplant-free measurements, the A1270 EMAT-HT for inspection of hot objects, and the A1570 EMAT data-acquisition unit for automated EMAT thickness measurements. The MT730 probe holder completes the lineup for stable, repeatable scans.
If your inspection involves coated, oxidized, or high-temperature surfaces where couplant is impractical, EMAT instruments are the efficient alternative to conventional ultrasonic testing.
