title: Baseline subtraction technique in the frequency-wavenumber domain for high sensitivity damage detection.
abstract: This paper suggests a method for high-sensitivity damage detection. The method is based on pitch-catch measurements of Lamb waves combined with a baseline subtraction technique in the frequency-wavenumber domain. Small amplitude converted modes, generated during the interaction of propagating waves with damage, can thus be detected with minimal a priori information regarding their expected location in the frequency-wavenumber plane. This method is applied in the present paper to a case of notches with varied depth. Finite element simulations are carried out in the temporal domain to mimic results obtainable in real-world experiments. Two cases are studied, namely when each of the two pure fundamental modes are incident on a notch. The advantages of the method are detailed. The procedure to implement this method is described in the context of Structural Health Monitoring (SHM) or Non-Destructive Testing (NDT).
authors.affiliation: UMI Georgia Tech - CNRS 2958, Metz Technopole, 2 rue Marconi, 57070 Metz, France. Electronic address: peter.mckeon@gatech.edu.
authors.forename: Peter
authors.initials: P
authors.lastname: McKeon
authors.forename: Slah
authors.initials: S
authors.lastname: Yaacoubi
authors.forename: Nico F
authors.initials: NF
authors.lastname: Declercq
authors.forename: Salah
authors.initials: S
authors.lastname: Ramadan
authors.forename: Weina K
authors.initials: WK
authors.lastname: Yaacoubi
mesh_terms: D000465:Algorithms; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008422:Materials Testing / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014463:Ultrasonography / Q000379:methods*
keywords: Baseline subtraction; Damage; Frequency–wavenumber domain; Lamb waves; Mode conversion; Spectral leakage