For ISO and CEN standards relating to UTM and related techniques, see the article Ultrasonic testing.
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However, when UTM is used with an Electromagnetic Acoustic Transducer (EMAT) the use of couplant is not required.
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The wave is usually emitted by a piezoelectric cell or EMAT Sensor that is built into the measurement sensor head and the same sensor is used to record the reflected wave.
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