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An ultrasonic thickness gauge is a measuring instrument for the non-destructive investigation of a material’s thickness using ultrasonic waves. The usage of an ultrasonic thickness gauge for non-destructive testing to check material properties such as thickness measurement and now regularly utilized in all areas of industrial measurements. The ability to gauge thickness measurement without requiring access to both sides of the test piece, offers this technology a multitude of possible applications.

UTM is frequently used to monitor steel thickness in various places of ships and offshore constructions. Surveyors equipped with portable UTM probes reach steel plating in sides, tanks, decks and the superstructure. They can read its thickness by simply touching the steel with the measurement head. Contact is usually assured by first removing visible corrosion scale and then applying petroleum jelly before pressing the probe against metal. It is also used for monitoring pipelines.

Ultrasonic thickness gauge advantages:

  • Non-destructive technique.

  • Does not require access to both sides of the sample.

  • Can be engineered to cope with coatings, linings, etc.

  • Good accuracy (0.1 mm and less) can be achieved using standard timing techniques.

  • Can be easily deployed, does not require laboratory conditions.

  • EMAT Transducers can be used without liquid couplant.

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