Non-Destructive Testing (NDT) – Laser Shearography
Laser Shearography is an optical measurement technique for Non-Destructive Testing (NDT) and Quality Control applications, commonly used on composites and metallic materials. The method is used for defect detection in an expedited manner.
The Laser Shearography principle consists of interferometric comparison of a test object in two states, a neutral and a loaded one. Advanced software algorithms perform live image processing to identify variations in out-of-plane deformations between both states, which in turn reveals surface or sub-surface discontinuities or anomalies by highlighting local weaknesses under certain load conditions.
The non-contact method can accommodate test specimen with curved and complex surface geometries. Laser Shearography is widely used by leading manufacturers within Aerospace, Automotive, Wind Power, Marine, Aviation, Textile and similar composite related industries. Laser Shearography allows users to measure and qualify both large and small complex geometries fast and efficiently, yielding real-time results.
Laser Shearography Solutions :
Laser Shearography quickly detects and locates discontinuities in composites materials. The method systematically finds flaws like: Wrinkles, Disbonds, Delaminations, Cracks, Crushed core, Kissing bonds, Fluid ingress, Cracked cores, Repair defects, Voids, Foreign Objects, Impact damage (BVID’s), etc.

Laser Shearography inspection requires the stressing or excitation of the component surface. Heat, vacuum or vibration excitation makes the technique suitable for a range of applications from QA in Manufacturing over Research to in-field Inspection operations.

Heating Excitation - is widely used because of its ease-of-implementation and speed of acquisition. Heat excitation is best suited for inspection of CFRPs laminates, metal sheets, thin GFRPs, etc.

Vacuum Excitation - is a mechanical excitation that aims to trigger defect indications by pulling the surface of the sample with a tunable vacuum. Vacuum excitation is best suitable for inspection of honeycombs, sandwich structures, foams, plastics, corks, etc.

Vibration Excitation – is a dual purpose inspection method allowing defects to vibrate and thus deform. The method can also be used for Eigen Modes and Eigen frequency analysis. The frequency analysis application is primarily utilized in turbomachine testing.

The combination of loading type and loading amount can be optimized for various materials. Using the correct excitation options for a given application reveals the potential and versatility of Laser Shearography in comparison to other NDT techniques.

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