AIR COUPLED ULTRASONIC CONTACTLESS METHOD FOR NON-DESTRUCTIVE DETERMINATION OF DEFECTS IN LAMINATED STRUCTURES

摘要

The invention describes an air coupled ultrasonic contactless method and an installation for non-destructive determination of defects in laminated structures (S) with a width (W) and a multiplicity of n lamellas with intermediate n-1 bonding planes (B), whereas at least one transmitter (T) in a fixed transmitter distance (WTS) radiates ultrasound beams at multiple positions and at least one receiver (R) in a sensor distance (WSR) is receiving re-radiated ultrasound beams at multiple positions relative to the laminated structure (S). The method images the position and geometry of for example lamination defects and allows for inspection of laminated structure (S) of arbitrary height (H) and length (L), and an individual assessment of specific bonding planes (e.g. B1, B2, B3), as well in situations with constrained access to the faces of the sample parallel to the bonding planes.