日本語フィールド
著者：寺本 顕武, 井上 亮二 読み: テラモト ケンブ, イノウエ リョウジ題名：A0モードラム波を用いたクラック近傍の撮像手法発表情報：第２７回センシングフォーラム 発表論文集 ページ: 261-266キーワード：非破壊検査 超音波計測 超音波撮像 ガイド波 概要：抄録：A0モードラム波を用いたクラック近傍の撮像手法}
{佐賀大学~~~$circ$寺本 顕武, 井上 亮二}
~~~
}
ame{$circ$ Kenbu Teramoto, Ryoji Inoue}
address{SAGA UNIVERSITY}
abstract{
The use of Lamb waves has recently been interested in the
non-destructive inspections for thin-plate-like structures.
The conventional time-of-flight technique is not
reliable for locating the defects even in isotropic plates
because of the dispersiveness in the Lamb wave propagation.
Avoiding difficulties caused by the dispersiveness,
this paper proposes a novel spatio-temporal gradient imaging method
which has an ability to localize cracks and to reconstruct
the near-field imges of cracks.
The proposed imaging method utilizes
the detarminant of covariance matrix of dynamic shear strains
which are definedover the object surface.
The detarminant denotes the distribution of
correlated intensity modulation
of the incident wave fronts with scattered ones.
In this study, the computational process in the wave field near the defects
is discussed and their physical meanings are investigated
through FDTD-simulations and acoustic experiments.英語フィールド
Author：Kenbu Teramoto, Ryoji InoueTitle：Announcement information: Page: 261-266An abstract：A0モードラム波を用いたクラック近傍の撮像手法}
{佐賀大学~~~$circ$寺本 顕武, 井上 亮二}
~~~
}
ame{$circ$ Kenbu Teramoto, Ryoji Inoue}
address{SAGA UNIVERSITY}
abstract{
The use of Lamb waves has recently been interested in the
non-destructive inspections for thin-plate-like structures.
The conventional time-of-flight technique is not
reliable for locating the defects even in isotropic plates
because of the dispersiveness in the Lamb wave propagation.
Avoiding difficulties caused by the dispersiveness,
this paper proposes a novel spatio-temporal gradient imaging method
which has an ability to localize cracks and to reconstruct
the near-field imges of cracks.
The proposed imaging method utilizes
the detarminant of covariance matrix of dynamic shear strains
which are definedover the object surface.
The detarminant denotes the distribution of
correlated intensity modulation
of the incident wave fronts with scattered ones.
In this study, the computational process in the wave field near the defects
is discussed and their physical meanings are investigated
through FDTD-simulations and acoustic experiments.