ESTIMATION OF THE AMPLITUDES OF ECHO SIGNALS OF LONGITUDINAL WAVES RECEIVED BY NORMAL AND ANGLE PROBES IN THE TANDEM TECHNIQUE WITH THE TRANSFORMATION OF RADIATED TRANSVERSE WAVES ON AN INFINITE VERTICALLY ORIENTED CRACK

The results of the calculation of the acoustic channel of the tandem technique with wave transformation with the use of normal and angle probes for the registration of longitudinal waves are presented. Formulas are obtained for calculating the amplitudes of echo signals during the transformation of transverse waves on the reflector in the form of a vertically oriented crack of the “stripe” type. The amplitudes of echo signals are compared when using normal and angle receiving probes, on the basis of which recommendations are given for choosing a scheme for sounding welded joints for the tandem technique with wave transformation on reflectors of the discontinuity type. It is shown that the maximum of the signal when registering a transformed longitudinal wave with a normal probe is significantly greater than such a maximum when registering it with an angle probe for depth values up to about 0.5 of the thickness of the test object.