METHOD FOR DETERMINING THE PRE-TENSIONING FORCE OF CONNECTION COMPONENTS BY ULTRASOUND EXCITATION

摘要

The invention relates to a method for determining the tensioning force of connection components (1), such as screws or bolts, by wide-band ultrasound excitation. The inventive method uses a pulse generator for generating an ultrasound pulse (7) with a statistically distributed phase position of used and/or resolvable frequency components with a pre-determinable pulse width. The pulse width is adapted to distances of ultrasound pulse echoes (8) in such a way that there is no overlapping of individual reflections, and the maximum possible pulse duration is reached. The received ultrasound pulse echo (8) is temporally selected in relation to at least one reflection and subjected to a transformation method in such a way that, for a defined moment related to the ultrasound pulse (7), all frequency contributions are shifted temporally or in relation to the phase.