In the recent years, continuous-wave near-field and lens-focused millimeter wave imaging systems have been effectively used to demonstrate their utility for producing high-resolution images of metallic structures covered with spay on foam insulation (SOFI) such as the Space Shuttle external fuel tank. However, for some specifc structures a certain interference pattern may be superimposed on the produced images. There are methods by which the influence of this unwanted interference can be reduced, such as the incorporation of an incidence angle and the proper use of signal polarization. This paper presents the basics of this problem and describes the use of the methods for reducing this unwanted influence through specific examples.
S. Kharkovsky et al., "Sources of and Remedies for Removing Unwanted Reflections in Millimeter Wave Images of Complex Sofi-covered Space Shuttle Structures," Proceedings of the 34th Annual Review of Progress in Quantitative Nondestructive Evaluation (2007, Golden, CO), vol. 975, pp. 1010-1017, American Institute of Physics (AIP), Jul 2007.
The definitive version is available at http://dx.doi.org/10.1063/1.2902543
34th Annual Review of Progress in Quantitative Nondestructive Evaluation (2007: Jul. 22-27, Golden, CO)
Electrical and Computer Engineering
Keywords and Phrases
Millimetre Waves; Nondestructive Testing; Reflectometers; Space Vehicles; Composite Testing and Evaluation; Microwave and Millimeter Wave Imaging
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Article - Conference proceedings
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