Location

La Jolla, CA

Start Date

1981 12:00 AM

Description

The objective of this research program is to develop microwave scattering techniques for obtaining quantitative information about the characteristic dimensions of surface cracks in metals. Work carried out during the past year has emphasized experimental techniques. The use of an IF bridge and a nearfield dielectric probe to improve the sensitivity of our 100-GHz eddy-current measurement system is described. The results of measurements made on fatigue cracks in 2024-T3 aluminum using this improved system also are presented. The interpretation of these data to provide information about crack depth is explained in terms of a simple model. Finally, a theoretical approach for modeling the scattering from elliptically shaped cracks is outlined.

Book Title

Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE

Chapter

15. Electromagnetic Techniques

Pages

498-509

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Microwave Eddy-Current Techniques for Quantitative NDE

La Jolla, CA

The objective of this research program is to develop microwave scattering techniques for obtaining quantitative information about the characteristic dimensions of surface cracks in metals. Work carried out during the past year has emphasized experimental techniques. The use of an IF bridge and a nearfield dielectric probe to improve the sensitivity of our 100-GHz eddy-current measurement system is described. The results of measurements made on fatigue cracks in 2024-T3 aluminum using this improved system also are presented. The interpretation of these data to provide information about crack depth is explained in terms of a simple model. Finally, a theoretical approach for modeling the scattering from elliptically shaped cracks is outlined.