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A significant proportion of premature
failures in components can be attributed to the presence and
subsequent propagation of defects within them. Few Non Destructive
Testing (NDT) methods are available that are truly capable of
inspecting and assessing structural integrity during service.
However, recent advances in the optoelectronics and imaging
technologies have resulted in the emergence of an optical technique,
shearography, that provides high resolution, in-service,
displacement/strain information.
The principal output from a shearography system is a fringe pattern
which gives the strain or displacement information. Defects or flaws
in the component under test induce anomalies in the output fringe
pattern and may thus be readily identified.The picture on the
right shows the shearography inspection of a firefighter’s composite
air cylinder. The blue regions indicate defect-free areas, whereas
the red region indicates the presence of a small and serious defect
in the internal liner, which had not been detected by the
conventional test.
AOS designs and manufactures shearography systems including the
award-winning portable shearography system for pipe-joint inspection
and the world’s first endoscopic
shearography camera.
View our presentation
"Principles of
Shearography" (280Kb) here.
For more information on AOS inspection services please
click here or
contact us for more information.
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