The method due to this invention, is something regarding the solution of the problem that it strengthens the interference protection of ultrasonic test. The signal which is received with ultrasonic transducer is divided into several zones, the main signal is separated from the component of that which is arranged inside the waiting zone of the signal which is reflected from defect, individual processing is administered to the signal from the time zone which differs and by from the based echo waiting zone transmitting the signal to the wideband amplifier from the zone of action of purobinguparusu. Filtering is administered to the signal from the waiting zone of the signal which is reflected from defect, the largest signal amplitude inside the waiting zone of the signal which is reflected from defect is decided. Value of this amplitude by comparison with maximum approved possible value, existence of defect/non- existence is decided from the result of this comparison. The spectrum of purobinguparusu and amplitude of the frequency component which has shown the quality of the spectrum of the useful signal which has been received the spectrum of purobinguparusu and showing the quality of the spectrum of the useful signal which has been received in inside the waiting zone of the signal which is reflected from defect, by comparing with the amplitude of the frequency component which is not, existence of defect/reliability of the decision in non- existing is appraised. In order that synchronous interference is removed from the reception signal, the main thing of accumulation of the reception signal and secondary cycle are executed, at the same time, the reception signal where synchronous interference is removed by subtraction doing the total signal which can as a main thing of accumulation and the result of executing secondary cycle, is acquired. Also the device which actualizes this method is presented. The number of independent claims is 2, the number in plans is 12.
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