A Working of Eddy Current Transducers under Control of Ferromagnetic Pipes in Condition of Insufficient Magnetic Saturation

Abstract:

The numerical method of calculation of electromagnetic field in a control sample at a time of work of encircling eddy current transducer is offered. The method is based on a numerical solution of the two Maxwell equations, which connect a change of electrical and magnetic fields. It allows to make calculations taking into account the actual value of magnetic inductivity of metal and to get results in any form, convenient for further interpretations. For the calculation of the encircling eddy current transducer the equivalent circuit of defect as step junction is offered. The numerical calculation shows, that the greatest sensitivity of the transducer is achieved when the value of magnetic permeability of the object of control is approximately 10-30. Therefore, it is not necessary to lead the material of the object of control up to satiety, as it considered before.

• Periodical: Applied Mechanics and Materials (Volume 467)
• Pages: 528-530
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.467.528
• Online since: December 2013
• Authors: Kai Yu Hao, Vadim Miroshnikov
• Keywords: Eddy Current Transducer, Ferromagnetic Pipes, Numerical Solution, Transducer

References

[1] Equations of mathematical physics. А.N. TiHonov, А.А. Samarskiy. -M.: Glavizdat, 1953. -679 p.

[2] Nondestructive control. Book 3, Electromagnetic control. Edited by V.V. Syhorykov. -.М.: Vishaya shcola, 1992, 490 с.

[3] Nondestructive control and diagnostics. Reference book. Edited by V.V. Kluev -M.: Mashinostroenie, 1995, 467 с.