Powerful Sources for High Frequency Electromagnetic Transducers for Measurement, Monitoring and Diagnostics

Сучков, Г. М.; Mygushchenko, R. P.; Plesnetsov, S.Yu.

doi:10.1134/s1061830917120063

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…To increase the EMAT efficiency, research and development is being carried out aimed at increasing the current I in the high-frequency coil [17], and at increasing the value of the normal component of the induction of the magnetic field in the surface layer of the OC [2,7,10,18]. It should be considered that when using combined EMATs, the efficiency depends to a greater extent on the magnitude of the induction B of the magnetic field than on the high-frequency current I [2,7].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Efficiency of the Surface-Mounted Ultrasonic Electromagnetic-Acoustic Transducer on Account of the Magnetic Field Source

et al. 2023

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Model studies were carried out using the COMSOL Multiphysics package, aimed at ensuring the forming of a permanent magnet magnetic field at a considerable distance to a ferromagnetic product from its pole, which is necessary to create efficient portable ultrasonic electromagnetic-acoustic transducers of thickness gauges and testing and diagnostic devices. It is theoretically shown and experimentally confirmed that for portable measuring ultrasonic devices it is expedient to set the height of the permanent magnet at about 60 mm and the cross section of the magnet pole 50x50 mm2. At the same time, with a gap between the magnet pole and the product of about 30 mm, the value of the normal component of the magnetic field induction near the surface of the object is about 0.3...0.4 T, which is sufficient for thickness gauging or diagnostics of ferromagnetic products using the ultrasonic pitch-and-catch method. References 19, figures 8.

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Section: Introductionmentioning

confidence: 99%

Increasing the Efficiency of the Surface-Mounted Ultrasonic Electromagnetic-Acoustic Transducer on Account of the Magnetic Field Source

et al. 2023

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Modeling Magnetic, Electric, and Acoustic Fields of a Pass-Through Transducer When Testing Cylindrical Objects

Petrov

Муравьева

Myshkin

et al. 2019

Russ J Nondestruct Test

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Optimization of the Parameters of the Magnetizing Device of the Electromagnetic-Acoustic Transducer

Strizhak

Pryakhin

2023

Prib. metody izmer.

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Contactless electromagnetic-acoustic transducers have a set of significant advantages over contact transducers, but at the same time they have significant disadvantages that require the development of effective magnetizing devices. Compared to magnetizing devices that are using permanent magnets, electric current magnetization devices are easily removed from the object of testing and cleaned from contamination by metal particles. Unfortunately, such transducers have significant dimensions and weight.A transducer containing a magnetic circuit magnetized by an electric current coil and two independent electromagnetic inductors located in the gap between the central part of the magnetic circuit and the object of testing has been developed. Inductors are two flat coils, each of them has form like a butterfly. The inductor conductors located in the working area have mutually perpendicular directions; they allow exciting and receiving the transversely polarized acoustic waves without rearranging the transducer. In order to reduce the overall dimensions and mass of the transducer, the mass and dimensional parameters of the magnetizing device were optimized for operating conditions when the magnetization of the object of testing and measurement are performed during the active measurement phase. During the passive measurement phase, which is three times longer than the active phase in time, the magnetizing device cools down. The cyclic mode with alternating active and passive phases made it possible to reduce the weight of the transducer by more than 3 times. In the working area of the transducer with a size of 15×15 mm, with a gap of 1 mm between the magnetic field concentrator and the object of testing, a field with a normal component of 2.4 T is created. The transducer has protection of the magnetization device from overheating, and the cyclic mode of operation allows for continuous performance of up to 30 measurements per minute at an ambient temperature of 20 °C.The developed magnetizing device can be used in solving a number of problems of structuroscopy, thickness measurement, flaw detection by electromagnetic-acoustic methods based on accurate measurement of the propagation time of elastic waves in the object of testing.

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Powerful Sources for High Frequency Electromagnetic Transducers for Measurement, Monitoring and Diagnostics

Cited by 3 publications

References 2 publications

Increasing the Efficiency of the Surface-Mounted Ultrasonic Electromagnetic-Acoustic Transducer on Account of the Magnetic Field Source

Increasing the Efficiency of the Surface-Mounted Ultrasonic Electromagnetic-Acoustic Transducer on Account of the Magnetic Field Source

Modeling Magnetic, Electric, and Acoustic Fields of a Pass-Through Transducer When Testing Cylindrical Objects

Optimization of the Parameters of the Magnetizing Device of the Electromagnetic-Acoustic Transducer

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