Waveguide tapering for beam-width control in a waveguide transducer

Kwon, Young Eui; Jeon, Hyun Joong; Kim, Hoe Woong; Kim, Yoon Young

doi:10.1016/j.ultras.2013.11.006

Cited by 13 publications

(12 citation statements)

References 22 publications

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“…Although the wave transmission from the patch to a waveguide during coupling with shear couplant might not be as good as the transmission when bonding with epoxy, the former is comparable with the latter in most applications. We used Sonotech SHEAR GEL Ò MAGNAFLUX as a shear couplant in our experiments [63,91,93].…”

Section: Mpts For Ndt Applications In Pipes and Rodsmentioning

confidence: 99%

“…4 shows some examples of directional MPTs. Plate-specific MPTs were not only used for imaging [88], but also for intriguing experiments involving phononic crystal and metamaterial plates [89][90][91], while some modified plate-specific MPTs can be used to generate bulk SH waves [92,93]. The thin magnetostrictive patches used for plate-specific MPTs have also been used for elasticity modulus measurement [94] and structural health monitoring [95][96][97].…”

Section: Introductionmentioning

confidence: 99%

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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: Mpts For Ndt Applications In Pipes and Rodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2015

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“…Reference [23] reported that the SH0 mode can propagate easily with less reflection when the thickness change is smoother and there is no mode conversion into the SH1 mode. Therefore, we designed our tapered waveguide units with a prismatic cross-section in a gradually changing side length which is similar with the middle part of the structure in Reference [19]. However, the excitation region in Reference [19] is located on the thinnest end, and the excitation region in the current research is located on the thickest end as shown in Figure 1.…”

Section: Propagation Characteristics Of Sh0* Wave Propagation In Tapementioning

confidence: 98%

“…However, less experimental investigations have been reported mainly due to the difficulties in generating SH waves. Electromagnetic acoustic transducers (EMATs) [19,23] can generate SH waves in tapered waveguide units. Reference [23] reported that the SH0 mode can propagate easily with less reflection when the thickness change is smoother and there is no mode conversion into the SH1 mode.…”

Section: Propagation Characteristics Of Sh0* Wave Propagation In Tapementioning

confidence: 99%

“…Joo et al [18] proposed a striped waveguide unit for the purpose of transmitting a single A0 mode Lamb waves. Moreover, Young et al [19] designed waveguide units with a prismatic cross-section and a tapered waveguide device to improve directivity of the interrogating waves. All these different methods can improve the measurement accuracy of the transducers.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Design Methodology of Tapered Waveguide Transducers for Thickness Monitoring

Jia

Ren

Wang

et al. 2020

Sensors

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For the purpose of providing transducers for long-term monitoring of wall thinning of critical pressure equipment in corrosion or high temperature environments, the optimal design methodology for tapered waveguide units was proposed in the present study. Firstly, the feasibility of the quasi-fundamental shear horizontal (SH0*) wave propagating in the tapered waveguide units was analyzed via numerical simulations, and the transmitting limitations of the non-dispersive SH0* wave were researched. Secondly, several tapered waveguide transducers with varying cross-sections to transmit pure SH0* wave were designed according to the numerical results. Experimental investigations were carried out, and the results were compared with waveguide transducers with a prismatic cross-section. It was found that the tapered waveguide units can transmit non-dispersive shear horizontal waves and suppress the wave attenuation at the same time. The experimental results agreed very well with the numerical simulations. Finally, high-temperature experiments were carried out, and the reliability of thickness measuring by the tapered waveguide transducers was validated. The errors between the measured and the true thicknesses were small. This work paves a solid foundation for the optimal design of tapered waveguide transducers for thickness monitoring of equipment in harsh environments.

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