Method for the nondestructive examination of a sample by ultrasonically storage and offline evaluation of the echo signals detected with a sensor matrix.

摘要

Method for the nondestructive examination of a sample (2) by means of ultrasound, in which ultrasonic waves are coupled into the sample (2) using a plurality of ultrasonic transducers and ultrasonic waves reflected within the sample (2) are received by a plurality of ultrasonic transducers and converted into ultrasonic signals that are the basis of the nondestructive examination, wherein: a) n ultrasonic transducers are disposed on a top surface (3) of the sample (2), b) a first ultrasonic transducer or a first group of i ultrasonic transducers of the n ultrasonic transducers is selected and activated to emit ultrasonic waves into the sample with in, c) the ultrasonic waves reflected within the sample (2) are received using m ultrasonic transducers, with i n, and m ultrasonic signals are generated, which are d) stored, and e) another ultrasonic transducer or another group i transdu ultrasonic ctor differing in at least one ultrasonic transducer of the first group is selected and activated to emit ultrasonic waves and are performed the process steps c) and d), f) the method step e) is executed repeatedly with the selection another ultrasonic transducer or another group i ultrasonic transducers in each case, with the proviso that the further ultrasonic transducer or another group i ultrasonic transducers differs from the already selected ultrasonic transducer or already selected group of i ultrasonic transducers, and in which is due to the n = 16 ultrasonic transducers arranged in a shape of two-dimensional array, that is located in rows and columns, they are placed on the surface of the sample, so that the reception of the ultrasonic waves reflected in the inside the sample is made by all ultrasonic transducers provided on the surface (3) of the sample (2), ie m = n, and the ultrasonic signals are evaluated offline using a reconstruction algorithm, i.e. after performing ultrasound transmission through the sample (2), implemented the algorithm reconstruction with the provision of a predeterminable angle of incidence of the ultrasonic waves virtually coupled in the sample, and that the activation of all i ultrasonic transducers belonging to a group occurs simultaneously, i.e. without phase shift.