CALCULATION OF PULSE ECHO SIGNALS WHEN CHANGING THE POSITION OF THE NORMAL PROBE RELATIVE TO THE STRATIFICATION IN THE METAL

A computer simulation of the amplitude change of the pulsed echo signal of a normal probe from a reflector in the form of a strip simulating a stratification in metal, the plane of which is parallel to the control surface, depending on the distance between the axis of the probe and the normal to the surface of the reflector in its center. The calculations used radiated pulses of various durations ‒ long, medium length and short. The expediency of using medium-length pulses has been established. The estimation of the linear conventional length of the stratification model by the method of reducing the amplitude of the echo signal from the largest by 20 dB showed that this size approximately corresponds to the size of the reflector used in calculations for the distance between the plane of the reflector and the control surface approximately equal to the three near fields of the probe.