| 摘要 |
The invention relates to a method for determining the size of a fracture ( 26 ) in a workpiece ( 20 ), in particular the depth of a fracture ( 26 ) in said workpiece ( 20 ), by means of the ultrasound pulse method, comprising the following method steps: a workpiece ( 20 ), with a front surface ( 22 ) and a back surface ( 24 ), having a fracture ( 26 ), extending from the back surface ( 24 ) and an angle test head ( 28 ) is applied to the front face ( 22 ), transmits ultrasound pulses at an angle alpha into the workpiece ( 20 ) and receives echoes from said pulse, the angle test head ( 28 ) is moved at least once over the fracture ( 26 ), such that the radiation beam ( 46 ) from the angle test head ( 28 ) completely covers the fracture ( 26 ), the received echo signals are digitized and stored in a memory ( 40 ) as variable pairs of echo signal versus runtime, the variable pairs form a value upwardly defined by an envelope ( 48 ) and the dimension of the fracture ( 26 ) is determined from the width of the envelope ( 48 ) at a given partial amplitude and the maximum amplitude of the envelope ( 48 ).
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