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The increasing industrial application of fiber reinforced plastics demands developments of new techniques for non-destructive testing. The sub-terahertz frequency band has proved to be a noteworthy option for this task. Composite structures or laminates can be inspected for foreign inclusions, delaminations, debonds, etc., using sub-terahertz sensors during the manufacturing process or maintenance...
Imagery applied to non-destructive testing implicitly includes the ability of imaging defects or foreign inclusions inside materials. Within a certain frequency range some nonmetal materials become highly transparent and only media interfaces or defects will scatter signals back to the sensor. Three-dimensional in-depth imaging is therefore possible and synthetic aperture processing can be applied...
We present a novel miniature module for terahertz attenuated total reflection spectroscopy. It is made of high resistivity silicon by applying free form optics fabrication and features two parabolic surfaces which act as the sensitive interfaces. Fiber coupling of highly integrated emitter and detector chips provides a high degree of flexibility.
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