Nondestructive testing with shearography (SNT 4045)
and with TV-holography (VibroMap 1000).
See also the VibroMap 1000 page for more information on the VibroMap 1000.
1 meter panel with 'L' shaped debond
Vibrating delamination Honeycomb structure with defect
Realtime vibration fringes showing delamination Imact damage detected by heating
Nondestructive Testing (NDT) by Speckle Interferometry
Speckle Interferometry is a common term used for techniques like TV-holography and shearography. With these techniques, laser light is used to detect static and/or dynamic displacements of object surfaces with very high sensitivity and accuracy. One main application of Speckle Interferometry is Nondestructive Testing - NDT. Speckle Interferometry is especially useful to detect defects in metallic and/or polymer composite materials. When the object is excited dynamically or statically, surface or sub surface defects can be detected, as many defects give inhomogeneous surface displacements when the object is excited.
Typical excitation methods are thermal loading, single frequency vibration, white noise vibration, vacuum or pressure loading, mechanical loading. Typical defects are delaminations and debonds, flaws, impact damage etc.
Optonor has long time experience with the use of Speckle Techniques for NDT applications. The Trondheim Group has delivered both TV-holography and shearography systems word wide for industrial NDT applications. The shearography system SNT 4045 can be customized for different industrial applications, like testing of large ship structures, aircraft structures, fan ducts, panels and a long range of other products. In addition, the TV-holography system VibroMap 1000 can also be used for several NDT applications. You are welcome to contact us to get an evaluation of your NDT problems and requirements.
Read recently published article in Norwegian NDT Magazine here (page 34-39, article is in Norwegian).