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Ultrasound are sound waves with
frequencies of over 20,000Hz

Cannot be heard by humans out of our

Ultrasound waves are partially reflected as
they pass from one material to another

We can use data on how long the waves
take to reflect in order to measure

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used to dislodge dirt from an object. The
object is placed into a container of cleaning
fluid and ultrasounswaves are fired into it.
This method means a low risk of damaging
the object and thorough clean.

Detecting Cracks when ultrasound
waves are fired at a surface, some of them


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