Patent ID: 8468889

Claim:
An apparatus for the non-destructive testing of samples using ultrasonic waves, comprising: a conversion prism in the form of a solid body, the conversion prism having a surface (A) and a further surface (B); a forward cell, the forward cell being filled with a liquid and having an open side, wherein the open side of the forward cell is placed onto the surface (A) of the conversion prism, so that the liquid and the surface (A) are in touching contact, and wherein the conversion prism is placed with the further surface (B) onto a surface of a sample to be tested; and at least one ultrasonic pressure wave transducer, the ultrasonic pressure wave transducer being arranged at the forward cell; wherein the at least one ultrasonic pressure wave transducer at the forward cell is configured to be positioned or are positioned at at least two positions (T 1 , T 2 ) at an equal spacing from the center of the surface (A) of the conversion prism, wherein the surface (B) is placed onto the sample.