Numerical analysis of piezoelectric probe for beam forming of longitudinal and shear waves

Aoyanagi, Masafumi; Wakatsuki, Naoto; Mizutani, Koichi; Ebihara, Tadashi

doi:10.7567/jjap.56.036601

Cited by 4 publications

(1 citation statement)

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“…We previously reported the principle of transmission and reception of longitudinal and shear components of elastic waves independently using a matrixlike probe with multiple electrodes. 26) However, its performance in terms of transient and frequency responses, for example, has not been evaluated. There are a number of studies of broadbandfrequency characteristics 27) in which the shape of a probe was designed.…”

Section: Introductionmentioning

confidence: 99%

Design of piezoelectric probe for measurement of longitudinal and shear components of elastic wave

Aoyanagi

Wakatsuki

Mizutani

et al. 2017

Jpn. J. Appl. Phys.

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We focus on ultrasonic probes for nondestructive tests and evaluation. Transient characteristics of probes are important for nondestructive tests such as the pulse echo method. We previously reported the principle of measurement using a piezoelectric probe with triaxial sensitivities. In the results, it was calculated that the probe could transmit and receive particle displacement which contains normal and tangential components. It was confirmed that the probe had sensitivities in triaxial directions. However, its performance in terms of frequency and transient characteristics has not been evaluated. The purpose of this study is to design a probe by changing its shape to obtain better performance. The transient characteristics of probes in longitudinal and shear driving were evaluated by the inverse Fourier transformation of frequency responses of longitudinal and shear components, using the two-dimensional finite element method. As a result, the sensitivities at the dips of frequency characteristics increased when using our probe compared with those measured using conventional probes in longitudinal and shear driving. Hence, the performance in terms of the frequency response was improved by more than 3 dB under the conditions in this simulation. Also, the pulse width of impulse response was decreased by half compared with that of probes with conventional shapes.

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Section: Introductionmentioning

confidence: 99%

Design of piezoelectric probe for measurement of longitudinal and shear components of elastic wave

Aoyanagi

Wakatsuki

Mizutani

et al. 2017

Jpn. J. Appl. Phys.

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A study of magnetostriction mechanism of EMAT on low-carbon steel at high temperature

Ren

Dixon

et al. 2019

NDT & E International

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The Electromagnetic acoustic transducer (EMAT) is used in a number of non-destructive testing applications [1][2][3][4][5]. The EMAT's operation is principally based on one of two mechanisms; the Lorenz force and magnetostriction mechanism [6-9]. The magnetostriction mechanism of an EMAT at elevated temperatures is reported in this paper. An optimized model is developed to describe the magnetostriction of polycrystalline iron, which is based on Brown's magnetic domain wall movement model [10] and Lee's magnetic domain rotation model [11]. The magnetostriction curves of polycrystalline iron for the temperature range 300 K to 900 K are predicted, which reveal that the saturated magnetostriction coefficient changes from to approximately . A non-linear, isotropic magnetostriction, finite element model is developed to simulate the Lamb waves generated in 4 mm thick steel plate by an EMAT, and the results show that the amplitude of S0 Lamb wave is greatly enhanced with an increase of temperature. In the experiments, a magnetostriction-based EMAT is used to generate Lamb waves in 4 mm thick steel plate. Experimental measurements verify that the contribution of the magnetostriction mechanism on steel rises as temperature increases in the range 298 K to 873 K, while the contribution to ultrasonic generation from the Lorenz force mechanism decreases, as expected. Key wordsElectromagnetic acoustic transducer, magnetostriction mechanism, high temperature, finite element model, low-carbon steel 1. IntroductionElectromagnetic acoustic transducers (EMATs) are used in non-destructive testing (NDT) as they offer several benefits including their non-contacting nature and their ability to generate and detect a range of wave modes [7,12,13] that are difficult to achieve using conventional transducers. The non-contact nature of EMATs makes them suitable for NDT applications where the object under test is at an elevated temperature or is moving [14][15][16][17][18]. EMATs have poor electro-mechanical efficiency as either generators or detectors and can have complicated coupling mechanisms for ferromagnetic materials, where both magnetoelastic and Lorentz mechanisms contribute to transduction. Research has been undertaken in an attempt to improve the efficiency of the EMAT and better understand the physics behind the coupling mechanisms involved [7,8,[19][20][21][22][23]. In operating on non-ferromagnetic materials, the EMAT has only Lorentz force mechanisms to consider. In ferromagnetic materials, magnetostriction and magnetisation mechanisms must also be considered [7,8]. Research on the quantization of the Lorentz force mechanism and magnetostriction mechanism has shown that, for the conventional EMAT that can operate via both mechanisms, the Lorentz force is usually the main contributor [24,25] to the

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CaBi₄Ti₄O₁₅-based lead-free sol–gel composites for high-temperature application

Yamamoto¹,

Kobayashi²

2018

Jpn. J. Appl. Phys.

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CaBi4Ti4O15 (CBiT)-based lead-free sol–gel composites were developed for high-temperature ultrasonic transducer application. In this study, two types of lead-free sol–gel solution, Ba0.7Sr0.3TiO3 (BST) and Bi4Ti3O12 (BiT), were used for consistency to fabricate ∼50-µm-thick CBiT/BST and CBiT/BiT films on 3-mm-thick titanium substrates by a sol–gel spray technique. BST and BiT were chosen because of their high dielectric constant and high Curie temperature, respectively, in addition to their being lead-free materials. A thermal cycle test was carried out between RT and 600 °C, and clear multiple echoes were confirmed during three thermal cycles for both materials. In addition, the sensitivity of CBiT/BiT was higher than that of CBiT/BST although a higher poling temperature is required for CBiT/BiT. Therefore, an ultrasonic transducer potential for high-temperature application was successfully demonstrated.

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Numerical analysis of piezoelectric probe for beam forming of longitudinal and shear waves

Cited by 4 publications

References 36 publications

Design of piezoelectric probe for measurement of longitudinal and shear components of elastic wave

Design of piezoelectric probe for measurement of longitudinal and shear components of elastic wave

A study of magnetostriction mechanism of EMAT on low-carbon steel at high temperature

CaBi₄Ti₄O₁₅-based lead-free sol–gel composites for high-temperature application

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Numerical analysis of piezoelectric probe for beam forming of longitudinal and shear waves

Cited by 4 publications

References 36 publications

Design of piezoelectric probe for measurement of longitudinal and shear components of elastic wave

Design of piezoelectric probe for measurement of longitudinal and shear components of elastic wave

A study of magnetostriction mechanism of EMAT on low-carbon steel at high temperature

CaBi4Ti4O15-based lead-free sol–gel composites for high-temperature application

Contact Info

Product

Resources

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CaBi₄Ti₄O₁₅-based lead-free sol–gel composites for high-temperature application