Step-frequency radar imaging for nondestructive evaluation (NDE) and ground-penetrating radar (GPR) applications

William H. Weedon; Weng Cho Chew; Chad A. Ruwe

doi:10.1117/12.186711

14 September 1994 Step-frequency radar imaging for nondestructive evaluation (NDE) and ground-penetrating radar (GPR) applications

William H. Weedon, Weng Cho Chew, Chad A. Ruwe

Author Affiliations +

Proceedings Volume 2275, Advanced Microwave and Millimeter-Wave Detectors; (1994) https://doi.org/10.1117/12.186711
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

We describe a step-frequency microwave radar imaging system that is suitable for nondestructive evaluation (NDE) and ground-penetrating radar (GPR) applications. The system includes a computer-automated microwave measurement apparatus along with nonlinear inverse scattering imaging algorithms. Through the use of an inverse Fourier transform, the SFR data is transformed into a synthetic time-domain pulse, and imaging algorithms are applied to the time-domain data. A calibration procedure involving the use of calibration targets is described in order to remove pulse distortions due to the effective aperture and dispersive nature of the antennas, as well as those distortions due to connectors, transmission lines, directional couplers and amplifiers. Reconstructions of various metallic and dielectric scattering objects including metallic rods, glass rods and plastic PVC pipes from real measurement data collected in our laboratory are shown.

Citation Download Citation

William H. Weedon, Weng Cho Chew, and Chad A. Ruwe "Step-frequency radar imaging for nondestructive evaluation (NDE) and ground-penetrating radar (GPR) applications", Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); https://doi.org/10.1117/12.186711

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