17 September 2009 Measurements of aerospace materials and their interpretation for non-destructive testing
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Abstract
Millimetre and terahertz radiation penetration into materials enables non-destructive testing capabilities for the aerospace industry, either remotely using imaging technology or locally using microscope type diagnostics. This paper presents measurements made on Norcoat and Prosial, used in the aerospace industry for thermal insulation and on carbon fibre, used for its high strength weight ratio. Michelson interferometer measurements over the band 100 GHz to 1 THz, with a 30 GHz spectral resolution, are presented, together with images of a range of samples taken using a 35 GHz real-time imaging system. The measured optical properties of these materials are examined and used in modelling to predict signatures of failure modes in these materials when they are attached to cryogenic fuel tanks.
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Neil A. Salmon, Ian Mason, Sean Price, John Beale, "Measurements of aerospace materials and their interpretation for non-destructive testing", Proc. SPIE 7485, Millimetre Wave and Terahertz Sensors and Technology II, 74850C (17 September 2009); doi: 10.1117/12.831137; https://doi.org/10.1117/12.831137
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