Near-Field Millimeter-Wave Imaging of Exposed and Covered Fatigue Cracks

Author

Kharkovsky, Sergey ; Ghasr, Mohammad T. ; Zoughi, Reza

Author_Institution

Dept. of Electr. & Comput. Eng., Missouri Univ. of Sci. & Technol., Rolla, MO

Volume

58

Issue

7

fYear

2009

fDate

7/1/2009 12:00:00 AM

Firstpage

2367

Lastpage

2370

Abstract

In this paper, the efficacy of near-field millimeter-wave nondestructive techniques, using open-ended flange-mounted rectangular waveguide probes, for extracting information of 3-D crack area deformation (i.e., in-plane and out-of-plane deformation) is demonstrated. It is shown that this information can be obtained from indications of unique interference patterns that are generated between the probe and the metal surface during the raster scan of a surface-breaking exposed and covered fatigue crack using a phase-sensitive reflectometer.

Keywords

deformation; fatigue cracks; microwave reflectometry; millimetre wave imaging; rectangular waveguides; 3-D crack area deformation; covered fatigue crack; information extraction; interference pattern; near-field millimeter-wave imaging; open-ended flange-mounted rectangular waveguide; phase-sensitive reflectometer; surface-breaking scan; Crack; imaging; interference pattern; millimeter waves; near field; nondestructive; reflectometer;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2009.2022380

Filename

4957049