Untitled record

The invention is a method for determining the sound velocity Cb in a base material using an ultrasonic probe comprising a transmitter element, a receiver element and a lead body, the lead body a) has a coupling surface at which the probe can be coupled to the base material, b) the receiver element and the transmitter element absorbs and c) has a sound velocity Cv, the transmit crystal and receive crystal are each inclined to one another and oriented obliquely to the coupling surface, so that a main transmission direction of the transmitting transducer and a main receiving direction of the receiving transducer intersect below the coupling surface, transmit crystal and receive crystal a pitch have K from each other, the transmitter element and the receiver element have a pitch Dv from the coupling surface, in which method an ultrasonic pulse is generated by the transmitter element, passes through the precursor body into the base material, there causes a creeping wave and reach of this part on the leading body to receive crystal , the shortest propagation time T tot is measured and the sound velocity Cb is determined in the base material over that way between transmit crystal and receive crystal that provides the shortest total travel time T tot.