Theory of Magnetostrictive Delay Lines for Pulse and Continuous Wave Transmission

William, R.C.

doi:10.1109/t-pgue.1959.29250

Cited by 28 publications

(7 citation statements)

References 8 publications

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“…The first application of the magnetostrictive phenomena was possibly made in a magnetostrictive delay line [7,8] and the phenomena have been widely applied in the design of sensors that measure position, mass, field and others. (Refer to [9,10] for more comprehensive reviews on this subject.)…”

Section: Introductionmentioning

confidence: 99%

Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides

2015

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A magnetostrictive patch transducer (MPT) is a transducer that exploits the magnetostrictive phenomena representing interactions between mechanical and magnetic fields in ferromagnetic materials. Since MPT technology was mainly developed and applied for nondestructive ultrasonic testing in waveguides such as pipes and plates, this paper will accordingly review advances of this technology in such a context. An MPT consists of a magnetic circuit composed of permanent magnets and coils, and a thin magnetostrictive patch that works as a sensing and actuating element which is bonded onto or coupled with a test waveguide. The configurations of the circuit and magnetostrictive patch therefore critically affect the performance of an MPT as well as the excited and measured wave modes in a waveguide. In this paper, a variety of state-of-the-art MPT configurations and their applications will be reviewed along with the working principle of this transducer type. The use of MPTs in wave experiments involving phononic crystals and elastic metamaterials is also briefly introduced.

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Section: Introductionmentioning

confidence: 99%

Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides

2015

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“…TGW has also been successfully generated using Electromagnetic Acoustic Transducers, EMATs [9]. These devices can be divided into two categories: transducers based on the Lorentz Force [10] and transducers based on the magnetostrictive effect discovered by James Joule and its inverse effect (Villari effect) [11]. In turn, TGW can be produced with magnetostrictive transducers in either of two ways.…”

Section: Guided Wave Testingmentioning

confidence: 99%

Development of Magnetostrictive Transducer Prototype for Blockage Detection on Molten Salt Pipes

et al. 2018

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In solar thermal power plants molten salt is often used to store and transport the energy that is collected during the day. The external pipe temperature is measured to activate an electric heating system if the temperature approaches the melting point. However, salt solidification cannot be completely excluded from the plant management. Once occurred, the location of a salt blockage is very complex due to the high temperature of the pipe. Therefore, when this problem arises, power plants have to stop production with the consequences in time and cost that this entails. Electromagnetic acoustic transducers can be used as non-destructive testing systems for this application. A method for salt blockage detection is proposed that is applicable in straight sections of pipes by employing torsional guided waves that are generated with magnetostrictive transducers. The present paper deals with the transducer conception and the design of the power supply to activate it. Two alternatives are proposed and compared to determine the improvement in the amplitude/noise ratio. Finally, the experimental results show the performance of the equipment in a small prototype, thus validating the technique presented.

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“…The basic assumption is that the variables concerned in magnetostriction, inverse magnetostriction, elasticity and magnetism are linearly related, which requires the presence of biasing magnets at both the exciting and receiving coils to insure that the operating points lie in the linear regions of the static characteristics of strain versus magnetic intensity [7,8]. The effect of eddy currents will be neglected because the skin depth of the magnetic field at the low exciting frequency is little, and hysteresis will also be neglected.…”

Section: Two Coupling Equationmentioning

confidence: 99%

“…(7), (8), and (9) form the basis of the analysis. The known quantity in these equations is the magnetic strength H , for a given coil geometry and a given current, H can be computed.…”

Section: Derivation Of Displacement Formula Of Guided Wave In a mentioning

confidence: 99%

A theoretical computation model of magnetostrictive guided waves NDT output signals in ferromagnetic cylinder

Wang

Zhu²,

Shen

et al. 2012

2012 IEEE International Conference on Information Science and Technology

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Ferromagnetic materials have a property of magnetostriction, guided wave generation is based on the magnetostrictive effect,and guided wave detection is based on the inverse magnetostrictive effect. A computation model of output signals of guided waves NDT in a ferromagnetic cylinder is proposed and discussed in this paper. It focuses on the magnetic and mechanical aspects of the system and the two linear constitutive piezomagnetic equations are used to illustrate the magnetomechanical coupling. To quantify the relationship between the input current applied to exciting coil and the output voltage induced in the receiving coil of the magnetostrictive sensor, some simplifications and assumptions are made.This model reflects a general prototype in the magnetostrictive sensor reception of guided wave in a ferromagnetic cylinder, and plays an important role in quantifying calculation and NDT in the engineering application.

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Theory of Magnetostrictive Delay Lines for Pulse and Continuous Wave Transmission

Cited by 28 publications

References 8 publications

Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides

Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides

Development of Magnetostrictive Transducer Prototype for Blockage Detection on Molten Salt Pipes

A theoretical computation model of magnetostrictive guided waves NDT output signals in ferromagnetic cylinder

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