Innerspec

Innerspec provides Non-Destructive Testing solutions that require high-power ultrasonic instrumentation, non-contact techniques (e.g. EMAT), or customized integrations.

EMAT or Electro Magnetic Acoustic Transducer is an Ultrasonic Testing (UT) technique that generates the sound in the part inspected instead of the transducer.

EMATs have the following advantages over more conventional piezoelectric transducers:

Dry inspection. EMATs do not require couplant for transmitting sound, which makes them very well suited for inspection of hot parts, and integrated in automated environments.
Impervious to surface conditions. EMATs can inspect through coatings and are not affected by pollutants, oxidation or roughness.
Easier probe deployment. Not having wedges or couplant, Snell's law of refraction does not apply, and the angle of the probe does not affect the direction of propagation. This makes them easier to control and deploy, especially in automated environments.