Event Title

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

Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

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 (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 coefficient 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.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18A

Chapter

Chapter 2: Electromagnetic, Thermal, and X-Ray Techniques

Section

Microwave NDE

Pages

569-576

DOI

10.1007/978-1-4615-4791-4_72

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

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

Snowbird, UT, USA

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 (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 coefficient 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.