Frequency-wavenumber domain methods for analysis of incident and scattered guided wave fields

Thomas E. Michaels; Massimo Ruzzene; Jennifer E. Michaels

doi:10.1117/12.816046

8 April 2009 Frequency-wavenumber domain methods for analysis of incident and scattered guided wave fields

Thomas E. Michaels, Massimo Ruzzene, Jennifer E. Michaels

Proceedings Volume 7295, Health Monitoring of Structural and Biological Systems 2009; 729513 (2009) https://doi.org/10.1117/12.816046
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

Full acoustic wavefield data were acquired from an aluminum plate with various structural discontinuities and artificial defects using an air-coupled transducer mounted on a scanning stage. Piezoelectric transducers permanently mounted on the specimen were used as wave sources. These source transducers were elements of a permanently attached sparse array. A time series of wavefield images clearly shows details of guided waves as they propagate outward from the source, reflect from specimen boundaries, and scatter from discontinuities within the structure. Distinct S₀ and A₀ Lamb wave modes are directly visible on constant time snapshots of the captured wavefield. However, the waves propagating outward from the source, and waves reflected from boundaries, obscure the weaker waves that are scattered from defects. To facilitate analysis of weaker scattered waves, source waves are removed from the full wavefield data using both time and frequency domain methods. The effectiveness of each method is evaluated in the wavenumber-wavenumber domain and results are fused to obtain images of scattered wavefields. The method is demonstrated on a through hole, to which a notch is added to simulate a crack. The angular dependence of the scattered wavefield is experimentally determined for source waves incident on the notch from two directions, one toward the side of the notch and the other toward the end of the notch.

Citation Download Citation

Thomas E. Michaels, Massimo Ruzzene, and Jennifer E. Michaels "Frequency-wavenumber domain methods for analysis of incident and scattered guided wave fields", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 729513 (8 April 2009); https://doi.org/10.1117/12.816046

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available