8 April 2016 Sizing and ranging criteria for SAR images of steel and wood specimens
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Abstract
The use of microwave and radar sensors in the nondestructive evaluation (NDE) of damaged materials and structures has been proven to be a promising approach. In this paper, a portable imaging radar sensor utilizing 10 GHz central frequency and stripmap synthetic aperture radar (SAR) imaging was applied to steel and wood specimens for size and range determination. Relationships between range and properties of SAR images (e.g. maximum amplitude and total SAR amplitude) were developed and reported for various specimens including a steel bar (2.5 cm by 2.5 cm by 28.5 cm), a wood bar (2.5 cm by 2.5 cm by 28.5 cm), a steel plate (39.7 cm by 57.9 cm by 1.75 cm), and a wood board (30.5 cm by 30.5 cm by 1.8 cm). Various ranges from 30 cm to 100 cm were used on these specimens. In our experiment, attenuation of radar signals collected by the imaging radar system on different material specimens was measured and modeled. Change in the attenuation of maximum SAR amplitude was observed in different materials. It is found that SAR images can be used to distinguish materials of different compositions and sizes.
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Viet Le, Viet Le, Tzuyang Yu, Tzuyang Yu, Jones Owusu Twumasi, Jones Owusu Twumasi, Qixiang Tang, Qixiang Tang, "Sizing and ranging criteria for SAR images of steel and wood specimens", Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 980404 (8 April 2016); doi: 10.1117/12.2218441; https://doi.org/10.1117/12.2218441
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