Air-coupled ultrasonic.


Air-coupled ultrasonic

Air-coupled ultrasonic is a non-destructive material testing method. In opposite to the usual ultrasonic examination with a couplant, mostly water or gel, the object does not Need to be moistened. The only couplant used is the surrounding air. Therefore this method is often referred to as couplant-free. Air-coupled ultrasonic has two capital advantages: It can be used directly in a production line and to examine very easily deformable objects or materials (e.g. elastomers).

The advantage of an ultrasonic examination using a couplant sometimes was the concentration of sonic waves which made it easier to analyse the resulting image of the test object. By combining different, powerful air-coupled ultrasonic transmitters and highly sensitive, low-noise air-coupled ultrasonic receivers it is possible to successfully examine objects with a thickness of up to 20 millimeter without much preparation and follow-up effort (i.g. by not having to use a water basin).

The non destructive material testing with air-coupled ultrasonic is very suitable to check samples for cavities, inclusions and inhomogeneities in plastics, wood, fibre composite materials, laminations, multilayer board constructions as well as in joints.