Geometric analysis for the size estimation of subsurface delamination in transient electromagnetic response

Tzu-Yang Yu; Burak Boyaci

doi:10.1117/12.880558

18 April 2011 Geometric analysis for the size estimation of subsurface delamination in transient electromagnetic response

Tzu-Yang Yu, Burak Boyaci

Author Affiliations +

Proceedings Volume 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011; 79831J (2011) https://doi.org/10.1117/12.880558
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

Detection of subsurface defects (e.g., delamination, cracking) using microwave/radar sensors (e.g., ground penetrating radar or GPR) is an important and promising technique for the effective and efficient maintenance of civil infrastructure. In this technique, reflected and scattered electromagnetic signals are typically collected and used for interpreting the size and property of subsurface damages. The objective of this paper is to investigate the feasibility of using finite measurements in the reflected signal for size estimation, through the geometric analysis of waveform. Simulated transient electromagnetic response was generated by finite difference time domain (FDTD) methods in two dimensional domain. A modulated Gaussian impulse at a center frequency of 3.5 GHz was used as the source. Rectangular delaminations with a width ranging from 3.048 cm to 16.256 cm and a thickness of 0.762 cm were considered. The depth of subsurface delamination was also studied. The curvature of reflected waveforms, obtained by three measurements, was used to correlate with the width of subsurface delamination. A relative width parameter was defined and used in the proposed equations for estimating the delamination width with less than 10% error. It is found that the relative width parameter is linearly proportional to the difference in waveform curvature. The proposed approach is potentially applicable to other subsurface defects with different shapes.

Citation Download Citation

Tzu-Yang Yu and Burak Boyaci "Geometric analysis for the size estimation of subsurface delamination in transient electromagnetic response", Proc. SPIE 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, 79831J (18 April 2011); https://doi.org/10.1117/12.880558

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

General packet radio service

Finite-difference time-domain method

Electromagnetism

Computer simulations

3D modeling

Dielectrics

Inspection

Show All Keywords

Keywords/Phrases

Search In:

Publication Years