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Modeling surface-acoustic-wave electromagnetic transducers
The Journal of the Acoustical Society of America, 1976An equivalent-circuit model for noncontact surface-wave electromagnetic Lorentz-force transducers has been developed from expressions describing the dynamic magnetic fields surrounding a transducer meander array of conductors. Both electrical and acoustical properties of the transducer are included in the model and agree well with experimental ...
T. L. Szabo, J. C. Sethares, H. M. Frost
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Electromagnetic acoustic transducer
The Journal of the Acoustical Society of America, 1985An improved electromagnetic acoustic transducer essentially which comprises supports located at both the ends of a core assembly, a plurality of ferrite members, a plurality of permanent magnets or electromagnets and a plurality of coils wound around the core assembly, said combination functioning to inspect for any defect in a tubing having a small ...
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Electromagnetic Acoustic Transducer
2016As an important branch of the nondestructive testing field, ultrasonic testing is widely used in the industries of steel, electricity, petroleum, transportation, and medical and others. In the process of ultrasonic testing, the ultrasonic transducer is the core component of the excitation and reception of ultrasonic waves, mainly including the ...
Songling Huang +3 more
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Optimal design of electromagnetic acoustic transducer
The XIX International Conference on Electrical Machines - ICEM 2010, 2010This paper considers design of Electro-Magnetic Acoustic Transducer based on numerical simulation. The EMAT consists of an exiting coil and two permanent magnets, which transmits the ultrasonic wave by the Lorentz force between the eddy current and the static magnetic field by the magnets.
Eiji Matsumoto, Shinji Kitamura, Jun Abe
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Electromagnetic type acoustic transducers
The Journal of the Acoustical Society of America, 1981An electromagnetic type acoustic transducer comprises a vibratable diaphragm including a conductor and disposed within a magnetic field defined by a permanent magnet. Support members which are expandable and contractible in the direction at right angles with the diaphragm are fixed to both surfaces of the diaphragm.
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Directional characteristics of electromagnetic acoustic transducers
Ultrasonics, 1988Abstract The directivity patterns of a wide range of electromagnetic acoustic transducers (EMATs) have been determined experimentally using a second, spiral coil EMAT as the detector around a cylindrical surface. A qualitative comparison to theory is presented, together with a discussion of the generation mechanisms involved.
J.K. Hu, Q.L. Zhang, D.A. Hutchins
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Magnetically shielded electromagnetic acoustic transducer
The Journal of the Acoustical Society of America, 1992An electromagnetic transducer including a diaphragm (36) mechanically connected to an armature(24), a coil (27) wound transversely around the armature, a permanent magnet (29, 31) adjacent the armature, and one or more additional magnetic members completing a magnetic circuit having a plane of symmetry longitudinally bisecting the armature, has a ...
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Computer optimization of electromagnetic acoustic transducers
1998 IEEE Ultrasonics Symposium. Proceedings (Cat. No. 98CH36102), 2002Electromagnetic acoustic transducers (EMATs) are well known devices that are commercially available. Their advantage is that they do not require a coupling medium and/or contact to the part being inspected; the disadvantage is their low transduction efficiency.
M. Kaltenbacher +4 more
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Flexible electromagnetic acoustic transducer sensor
The Journal of the Acoustical Society of America, 2007An array of magnets (19) designed of flexible components and materials can be easily shaped to fit to the contour of various curved surfaces and structures (3). EMATs that incorporate these magnets (19), in addition to being flexible, may be smaller in volume than the conventional EMAT magnets and therefore easier to apply to complex structures where ...
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Simulation of acoustic fields of synphase electromagnetic-acoustic transducers
Russian Journal of Nondestructive Testing, 2013A model of the formation of acoustic fields of a synphase EMA transducer of longitudinal and transverse waves in the form of a phased array of elements with a current is proposed. This model takes several parameters into account, such as the number and dimensions of individual elements of the array and its aperture, the operating frequency, and the gap
O. V. Murav’eva, A. V. Myshkin
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