ULTRASOUND GEOMETRY VALIDATION WITH CORRECTION OF POSITIONING INACCURACY OF THE TRANSDUCER

The invention relates to a method for ultrasonic geometry testing of a test object (28) at various measuring positions distributed along a surface (26) of a test object (xn) by means of at least one ultrasonic transducer, comprising a plurality of steps. First, a calibration device (20) with known dimensions (ODcal(xn)) is provided. Then there follow several calibrating steps, during each of which a measuring position specific distance (WP(xn)) between calibration device (20) and ultrasonic transducer (10) is determined and stored by an ultrasonic transit time method, by at least one echo on at least one surface of the calibration device (20), using the known dimension (ODcal(xn)) for each measuring position n. Subsequently, a test object (28) is provided, at which ultrasonic transit time measurements are performed in multiple test steps. Transit time measurements are thereby taken at several measuring positions xn, using at least one echo on at least one surface (26) of the test object (28). In the following evaluation step a dimension (27) of the test object is calculated using the measuring position-specific distances WP(xn).