Publication: Enhancement of surface inspection by Moiré interferometry using flexible reference gratings
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2001-06-01
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The Optical Society Of America
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Abstract
We have extended the use of shadow Moiré technique to be implemented in simple curved surfaces by using a flexible grating. Dynamic visual inspection of surface micro-damages is significantly favored by the use of well adapted pliable gratings compared to the use of flat reference gratings. The experimental set-up consists of a plastic foil with a printed Ronchi grating stretched between three points which adapts to any cylindrical or conical convex surface independently of the relative orientation grating/surface. Static quantification of defects profiles is also possible with an attached CCD camera. Visual detection of defects in the range of ~30 μm in depth is obtainable.
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©2001 Optical Society of America.
This work has been developed and supported within the framework of the European Project INDUCE: Advanced Integrated NDT Concepts for Unified Life-Cycle, ref. BRPR-CT98-0805.
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