The computations of reflection coefficients of multilayer structure based on the reformulation of Thomson-Haskell method

Chen, Jian; Bai, Xiaolong; Yang, Kun; Ju, Bing‐Feng

doi:10.1016/j.ultras.2012.08.004

Cited by 15 publications

(4 citation statements)

References 12 publications

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“…Multilayer structures play an important role in the production and manufacturing of industrial products, such as solid rocket motors, aircraft skin, and generator blade, due to their advantages in corrosion protection, wear-resistant and strength enhancement, and so on [1,2]. In order to ensure the reliable quality and performance of these layered structures, nondestructive testing (NDT) of these structures is essential [3].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Total Focusing Imaging Method of Multilayer Composite Structures Using the Root‐Mean‐Square (RMS) Velocity

Guo

Yan

2021

Advances in Materials Science and Engineering

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Multilayer composite structures have been widely used in industrial manufacturing, and nondestructive testing of these multilayer structures is to ensure their reliable quality and performance. Currently, ultrasonic total focusing method (TFM) imaging using full-matrix capture (FMC) technology has been proven to sense small defects in a single homogeneous medium and improve the imaging signal-to-noise ratio. However, these algorithms cannot be accurately applied to imaging of multilayer composite structures, due to the acoustic impedance variation and because reflection and refraction occur at the interface between the layers, which makes it very difficult to calculate the ultrasonic propagation path and time. To solve this problem, a root-mean-square (RMS) velocity algorithm for total focusing imaging of multilayer structures is proposed in the article. Based on the theory of RMS velocity for processing of seismic data, the approximated delays can be easily and quickly calculated by a hyperbolic time-distance relationship under circumstances of short lateral distance and horizontal layers. The performance of the proposed algorithm is evaluated by total focusing imaging of a two-layer medium with drilled holes and conducted by the finite element simulation. To further improve imaging efficiency, the partial data in the full-matrix data were used for imaging which is the simplified matrix focusing method (SFM). The results verify that the proposed methods are capable of total focusing imaging of two-layered structures. However, the imaging performance and efficiency of these algorithms are different.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Total Focusing Imaging Method of Multilayer Composite Structures Using the Root‐Mean‐Square (RMS) Velocity

Guo

Yan

2021

Advances in Materials Science and Engineering

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“…881-884, doi: 10.21495/91-8-881 can be calculated in some ways. One of them was presented in this article but some authors use reformulation of this parameter to identify adhesion and quality of the adhesive joint (Chen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of adhesion between adhesive coating and steel substrate by ultrasonic method

Ulbrich¹,

Selech²,

Romek³

et al. 2018

Engineering Mechanics

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In the article the non-destructive method of an evaluation of adhesion between adhesive coating and steel substrate is presented. The adhesion was calculated on the basis of ultrasonic measurement of wave propagating on the border of the adhesive connection. Measurements were performed in nine deterimned points before and after application of car putty coating. In each point, 30 measurements of parameters of ultrasonic wave were conducted. The height of the pulses reflected from the bottom of the steel sheet and then from the interface between the coating and the steel substrate was controlled. The average value of the reflection coefficient was on the level around 0.5. On the basis of the reflection, the coefficients can be estimated adhesion of the coating to the substrate, expressed in MPa, which is about 3.5 to 7.5 MPa. The next step in research is to calculate reflection coefficient value for surfaces prepared in a different way and for different adhesive coatings.

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“…Multilayer structures play a significant role in industrial fields, such as aircraft, submarine and semiconductor, because of their advantages in weight reduction, strength enhancement, wear and corrosion protection, and so on [1,2]. Therefore, non-destructive testing and evaluation (NDE) of these structures are important to assure their quality and performance [3].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic array imaging of multilayer structures using full matrix capture and extended phase shift migration

Chen

Yang

et al. 2016

Meas. Sci. Technol.

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The computations of reflection coefficients of multilayer structure based on the reformulation of Thomson-Haskell method

Cited by 15 publications

References 12 publications

Ultrasonic Total Focusing Imaging Method of Multilayer Composite Structures Using the Root‐Mean‐Square (RMS) Velocity

Ultrasonic Total Focusing Imaging Method of Multilayer Composite Structures Using the Root‐Mean‐Square (RMS) Velocity

Evaluation of adhesion between adhesive coating and steel substrate by ultrasonic method

Ultrasonic array imaging of multilayer structures using full matrix capture and extended phase shift migration

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