Update: Powerpoint

The lecture will be the 11st march 2013 at 17 h 30 and take place in Montéfiore (B28) local MIPS.

M. Emile Schweicher will be the lecturer. A drink will be offered at the end of the lecture.

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Abstract:

The fringe density of an interferogram (i.e.,the set of interference fringes overlaid on a hologram) is a increasing known function of the deformation (between unconstrained and constrained object), i.e., the larger the deformation, the smaller the fringe spacing, the closer the fringes. Since the smallest measurable deformation is of the order of the wavelength, holographic interferometry is 10 times more sensitive than other NDI (Non Destructive Inspection) methods like eddy currents (wervel stromen) or strain gages (rekstrookjes).
Similar to X-ray images, THz (TeraHertz) waves penetrate through most materials and can easily reveal imperfections such as voids,delaminations, cracks and density variations. THz waves offer some advantages over X-ray including that the radiation is non-ionising , thus completely safe. THz NDI will be used in pharmaceutical industry (a very conservative industry) & in cloth, plastics, ceramics, paper, food industries. Example: THz imaging applications include flaw detection in the Sprayed-On-Foam-Insulation (SOFI) for the Space Shuttle programme. At the same time, large molecules have characteristic THz spectra. Recent reports of shoebox-sized scanners for drugs and explosives (THz fingerprints) also promise easier law enforcement.


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