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Simultaneous measurement of thickness and sound velocity of porous coatings based on the ultrasonic complex reflection coefficient.

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Title: Simultaneous measurement of thickness and sound velocity of porous coatings based on the ultrasonic complex reflection coefficient.
Authors: Dou, Pan1,2 (AUTHOR), Zou, Laisheng1 (AUTHOR), Wu, Tonghai1 (AUTHOR) tonghai.wu@mail.xjtu.edu.cn, Yu, Min3 (AUTHOR), Reddyhoff, Tom3 (AUTHOR), Peng, Zhongxiao2 (AUTHOR)
Source: NDT & E International. Oct2022, Vol. 131, pN.PAG-N.PAG. 1p.
Subjects: Reflectance, Sound measurement, Thermal barrier coatings, Thickness measurement, Speed of sound, Ultrasonic waves
Abstract: The ultrasonic pulse-echo method is widely adopted in measuring coating thickness via parameter inversion of the reflection coefficient. However, the ultrasonic application to thermal barrier coatings (TBCs, as typically applied on aero-engine blades) remains a challenge, as the porous structure significantly attenuates sonic propagation, which is also difficult to characterize. In this article, a method that effectively addresses this issue without the need of the wave attenuation coefficient is presented. Specifically, the complex ultrasonic reflection coefficient can help calculate the coating-induced phase shift, which is found to linearly vary against the ultrasonic wave frequency. The slope of this linear function, depending on the structural porosity, enables simultaneous measurements of both the sound velocity and the thickness of the coating. Moreover, the effectiveness of the proposed method is verified by acoustic finite element simulations and experimental measurements of 8YSZ thermal barrier coatings. [ABSTRACT FROM AUTHOR]
Copyright of NDT & E International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 158390367
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Simultaneous measurement of thickness and sound velocity of porous coatings based on the ultrasonic complex reflection coefficient.
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  Data: <searchLink fieldCode="AR" term="%22Dou%2C+Pan%22">Dou, Pan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zou%2C+Laisheng%22">Zou, Laisheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Tonghai%22">Wu, Tonghai</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> tonghai.wu@mail.xjtu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yu%2C+Min%22">Yu, Min</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Reddyhoff%2C+Tom%22">Reddyhoff, Tom</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peng%2C+Zhongxiao%22">Peng, Zhongxiao</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22NDT+%26+E+International%22">NDT & E International</searchLink>. Oct2022, Vol. 131, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Reflectance%22">Reflectance</searchLink><br /><searchLink fieldCode="DE" term="%22Sound+measurement%22">Sound measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+barrier+coatings%22">Thermal barrier coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Thickness+measurement%22">Thickness measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Speed+of+sound%22">Speed of sound</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonic+waves%22">Ultrasonic waves</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The ultrasonic pulse-echo method is widely adopted in measuring coating thickness via parameter inversion of the reflection coefficient. However, the ultrasonic application to thermal barrier coatings (TBCs, as typically applied on aero-engine blades) remains a challenge, as the porous structure significantly attenuates sonic propagation, which is also difficult to characterize. In this article, a method that effectively addresses this issue without the need of the wave attenuation coefficient is presented. Specifically, the complex ultrasonic reflection coefficient can help calculate the coating-induced phase shift, which is found to linearly vary against the ultrasonic wave frequency. The slope of this linear function, depending on the structural porosity, enables simultaneous measurements of both the sound velocity and the thickness of the coating. Moreover, the effectiveness of the proposed method is verified by acoustic finite element simulations and experimental measurements of 8YSZ thermal barrier coatings. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of NDT & E International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.ndteint.2022.102683
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Reflectance
        Type: general
      – SubjectFull: Sound measurement
        Type: general
      – SubjectFull: Thermal barrier coatings
        Type: general
      – SubjectFull: Thickness measurement
        Type: general
      – SubjectFull: Speed of sound
        Type: general
      – SubjectFull: Ultrasonic waves
        Type: general
    Titles:
      – TitleFull: Simultaneous measurement of thickness and sound velocity of porous coatings based on the ultrasonic complex reflection coefficient.
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            NameFull: Dou, Pan
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            NameFull: Zou, Laisheng
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            NameFull: Wu, Tonghai
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            NameFull: Yu, Min
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            NameFull: Reddyhoff, Tom
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            NameFull: Peng, Zhongxiao
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            – D: 01
              M: 10
              Text: Oct2022
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              Y: 2022
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              Value: 131
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