Ultrasonic thickness measurement

A method of non-destructive testing, ultrasonic thickness measurement (UTM) gauges the thickness of a metal by passing an ultrasonic wave through that material and measuring the length of time it takes to return to the surface. UTM is often used to monitor the thickness of metal or weld quality in industrial settings. This might help detect whether corrosion, erosion or damage means a part needs to be repaired or replaced, for instance. As it is a non-destructive technique which can quickly and easily be deployed on site, it has value in not disrupting operations, which would otherwise cost money. The instrument used can measure the thickness of a metal through coatings with a good level of accuracy, and from one side of the sample (unlike micrometers or calipers, which require access to both sides). UTM is not limited to metals testing, though. Practically any common engineering material can be measured, including ceramics, fibreglass and plastics. It is invaluable for many industry sectors including oil and gas, construction, ship building and so on.