Abstract. The task of pipeline diagnosing with the use of a phased antenna array (FAA) on an electromag-netic-acoustic converter (EMAC) is considered. A new algorithm for phased EMAC arrays is proposed; the algorithm provides improved accuracy characteristics and a faster scanning of a test object than the classical diagnostic method with FAA. The efficiency and performance of the developed scanning algorithm is studied experimentally with the help of the EMAC-FAA prototype and a test sample. Comparison of the new algorithm with the classical one on the base of the experimental results demonstrates that the proposed scanning solution allows to reduce the effect of crosstalk significantly and to increase the signal-to-noise ratio in the distributions of the echo signal amplitudes.

Keywords: phased antenna array, ultrasonic diagnostics, non-destructive testing, electromagnetic- acoustic converter

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