METHOD FOR THE DESTRUCTION-FREE DETECTION OF A ROTATIONAL MOVEMENT ON THE SURFACE OF A TEST OBJECT; APPARATUS THEREFOR AND TEST UNIT

摘要

The invention relates to an apparatus for the destruction-free detection of a rotational movement, for example of a test head, on the surface of a test object. In an embodiment which is developed further, a translatory movement on the surface of the test object can also be detected. For this purpose, the apparatus comprises a transmitter which is set up to emit a temporal sequence of excitation signals Si which at least partially penetrate the test object and interact with the latter. Provision is also made of an array which is based on a plurality of receivers which are set up to receive echo signals which result from the interaction between the excitation signals Si emitted by the transmitter and the test object. The echo signals to an excitation signal Si, which are received by the receivers, form a set M(Si) of measured values. Finally, provision is made of an evaluation unit which is set up to determine a rotational movement of the apparatus on the surface from a plurality of sets of measured values M(Si) which are correlated with temporally successive excitation signals Si.