Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Microwave Detection of Stress Induced Farigue Cracks in Steel and Potential of Crack Opening Determination Using a New Phase Sensitive Approach Based on a Waveguide Magic TEE

Published

Author(s)

N Qaddoumi, E Ranu, R Zoughi, Joseph D. McColskey

Abstract

Detection and evaluation of surface cracks in metals is an important facet of nondestructive testing and evaluation (NDT&E). Cracks in bridges, aircraft wings and other metal structures can pose serious danger to the structure and ultimately human lives. Detection, being the first step in NDT&E, has been accomplished on a variety of cracks using several recently developed microwave techniques; namely, dominant mode, higher-order mode and open-ended coaxial lines [1-4]. Evaluation of crack properties (be it crack width, depth, load estimation or other useful information) is the next step in fully determining the threat that a crack may pose to a structure. Surface crack detection, using open-ended rectangular waveguides is primarily based on changes in the phase of the reflection coefficent at the waveguide aperture when a crack is scanned. Therefore, a phase sensitive system may be used for this purpose. The use of a magic tee based approach has the advantage of quick and interactive phase adjustments-adjustments are made immediately by the turn of a knob. In this way optimization is an easy and effective process.
Proceedings Title
Quantitative Nondestructive Evaluation, Conference | | | Springer-Verlag
Volume
18/A
Conference Dates
June 1, 1999
Conference Location
Undefined
Conference Title
Review of Progress in Quantative Nondestructive Evaluation

Keywords

Fatigue Crack Detection, Microwave NDE, Open-ended Rectangular Waveguide, Waveguide Magic TEE

Citation

Qaddoumi, N. , Ranu, E. , Zoughi, R. and McColskey, J. (2000), Microwave Detection of Stress Induced Farigue Cracks in Steel and Potential of Crack Opening Determination Using a New Phase Sensitive Approach Based on a Waveguide Magic TEE, Quantitative Nondestructive Evaluation, Conference | | | Springer-Verlag, Undefined (Accessed April 13, 2024)
Created June 30, 2000, Updated October 12, 2021