Location

Seattle, WA

Start Date

1-1-1996 12:00 AM

Description

Some authors have demonstrated recently the capability of microwave imaging of subsurface defects and material characteristics by scanning a suitably excited open-ended rectangular waveguide over a multi-layered composite [1,2]. This near-field approach of microwave NDE is in some aspects similar to the conventional eddy-current based techniques for defect detection and imaging in metals [3]. Of course, in non-metallic materials, it is the discontinuities in the dielectric property, instead of the electrical conductivity, that gives rise to the defect signal. Bahr [4,5] has reported various techniques for the detection, discrimination, and processing of microwave signals, which are also applicable in the lower frequency regime typical of eddy current testing.

Volume

15A

Chapter

Chapter 2: Emerging Inspection Technologies

Section

Microwave Techniques

Pages

713-718

DOI

10.1007/978-1-4613-0383-1_93

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Effects of Lift-Off on Microwave NDE Using an Open-Ended Rectangular Waveguide

Seattle, WA

Some authors have demonstrated recently the capability of microwave imaging of subsurface defects and material characteristics by scanning a suitably excited open-ended rectangular waveguide over a multi-layered composite [1,2]. This near-field approach of microwave NDE is in some aspects similar to the conventional eddy-current based techniques for defect detection and imaging in metals [3]. Of course, in non-metallic materials, it is the discontinuities in the dielectric property, instead of the electrical conductivity, that gives rise to the defect signal. Bahr [4,5] has reported various techniques for the detection, discrimination, and processing of microwave signals, which are also applicable in the lower frequency regime typical of eddy current testing.