ultrasonic thickness indicator

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• ultrasonic inspection — A nondestructive test method that employs high frequency mechanical vibration energy to detect and locate structural discontinuities or differences and to measure the thickness of a variety of materials. Radiation frequency is of the order of 0.1 …   Aviation dictionary

• resonance method of ultrasonic inspection — A method of detecting material thickness or an indicator of the internal damage by injecting variable frequency ultrasonic energy into a material. A specific frequency of energy will produce the greatest return in a given thickness of material.… …   Aviation dictionary

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