Desyatnichenko O. Electromagnetic-acoustic thickness gauge for testing metal products with dielectric coating

Subject of the research: interaction of magnetic, electromagnetic pulse and acoustic fields with electrically conductive metal product which leads to formation of a signal containing information about thickness of the metal product. Object of the research: development of theoretical and practical bases for testing thickness of metal products by electro-magnetic and acoustic method in the presence of nonconducting coatings (gaps) with thickness up to 10 mm. Research methods and equipment: shadow and reflecting-shadow methods of ultrasonic test, methods for evaluation of factors influencing accuracy of thickness testing, methods of information processing, methods of blind zone reduction, methods of reduction of electro-magnetic and acoustic interferences. Theoretical and practical results: prototype model of electro-magnetic thickness gauge has been developed and produced, this thickness gauge allows testing thickness of metal products with coatings (gaps) up to 10 mm thick. Breakthrough: method of formation and reception of bottom-reflected signals of electro-magnetic and acoustic thickness gauges has been developed, which enables testing without removal nonconducting coatings up to 10 mm thick. Implementation extend: results of this thesis work are implemented by “SP “Promnadzor” Ltd., Donetsk for performance of metal products thickness testing, by “MK Azovstal” Public Company in Mariupol for testing rolled rails; the results were also used for academic activity of the chair. Area of application: at metal-working enterprises and enterprises with industrial use of metal products.