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Документ Еlectromagnetic-acoustic transducers for ultrasonic measurements, control and diagnostic of metal products(Національний науковий центр "Інститут метрології", 2019) Salam, Bussi; Suchkov, G. M.; Mygushchenko, R. P.; Kropachek, O. Yu.; Plesnetsov, S. Yu.An effective type of ultrasonic method is the electromagnetic-acoustic method, especially in determining the quality of ferromagnetic products. The main factor determining the efficiency of using electromagnetic-acoustic transducers is the magnitude of the induction of a polarizing magnetic field, which is determined by the source. The studies carried out in the framework of this activity were aimed at solving the problems of high-quality measuring testing of metal products from ferromagnetic materials by electromagnetic-acoustic transducers. The requirements are formulated for a pulsed source of a polarizing magnetic field, inductors, and core as part of electromagnetic-acoustic transducers. Taking into account the requirements, structural solutions have been proposed for constructing electromagnetic-acoustic transducers with a flat two-window inductor and a flat high-frequency inductor. Experimental studies aimed at improving ultrasonic electromagnetic-acoustic transducers with pulsed magnetic field sources have been performed. The possibility of providing the sensitivity of new transducers with thickness measurement, measuring control and diagnostics is shown. Technical solutions are proposed that reduce the effect on ultrasonic pulses of the received Barkhausen noise and coherent interference from the magnetostrictive conversion of electromagnetic energy into ultrasonic. The efficiency of using electromagnetic-acoustic transducers with a pulsed polarizing magnetic field is shown for measuring quality control of ferromagnetic products made by rolling, stamping and the like.Документ Electromagnetic-acoustic method of ultrasonic pulse excitation and reception in metal products(Харківський національний університет імені В. Н. Каразіна, 2017) Plesnetsov, S. Yu.; Suchkov, G. M.The problem of the main factors infl uence on the electro-magnetic energy to ultrasound conversion in test-ing of electrically conductive or ferromagnetic materials is considered. The necessity to provide the polarizing magnetic fi eld induction maximum value and the maximum current in the electromagnetic-acoustic transducer high-frequency coil is shown. A converter for co-radiation and reception of pulses of ultrasonic vibrations has been developed and tested, providing useful information signal amplitude of up to 50 dB.Документ Simulation of Electromagnetic Conversion Process Under Torsion Waves Excitation(Інститут електродинаміки НАН України, 2018) Plesnetsov, S. Yu.; Petrishchev, O. N.; Mygushchenko, R. P.; Suchkov, G. M.Mathematical modeling of the electromagnetic-acoustic transducer (EMAT) for excitation of nondispersive torsional waves in tubular electrically conductive ferromagnetic hollow rods of small diameter is performed taking into account all the factors that determine the design of the EMAT. The solutions of the differential equation for the values of the electromagnetic fields formed by the high-frequency coil of the device in the gap between the transducer and the tubular ferromagnetic product are found. The results of the research can be used to simulate and design exciting EMATs for measuring, monitoring, and diagnostics in the energy, nuclear, chemical and other industries for ultrasonic test of ferromagnetic tubular products.