Research in nondestructive testing is focused on the use of acoustic emission method. Acoustic emission is usually expressed by means of elastic waves occurring during rapid relaese of stress energy in the material. Acoustic emission can be induced by many mechanisms, such as plastic deformation, crack initiation and formation, fast phase transformation, etc. Mechanical waves are detected on the surfaces of the objects by various types of sensors. The sensors then transform the waves to electrical signal providing information about the phenomena occurring within the loaded material.
Method of acoustic emission is used in various applications in industry, nuclear technology, civil engineering and power engineering. It is usually used for detection of leakages in pipelines, machine diagnostics, wear of bearings, etc. The detection of formation defects in pressure vessels and pipeline systems is of a main interest in the area of non-destructive testing. The phenomenon of acoustic emission can be used widely. It can be also used for inspection of non-metallic materials such as various types of composites, plastics, ceramics and concrete. The advantage of this method is that it allows simultaneous inspection of the whole object by the multi-channel system while detecting only active defects, which could potentially endangering it's operation. We are especially focused on material research of cyclically loaded materials and diagnostics of machine parts and components (bearings, pneumatic components, etc.).