Shearography is an optical, Non- Destructive Testing (NDT) technique that provides fast and accurate indications about internal material discontinuities or anomalies in non-homogenous materials. Using laser light, a shearing interferometer is able to detect extremely small (sub-micrometer) changes in surface out-of-plane deformation. When a test object is subjected to an appropriate load, a proportional strain is induced on the test surface. If underlying discontinuities are present, the surface will deform unevenly at these locations. This is then interpreted through the shearing interferometer as a change in the phase of the laser light.
Shearograpy allows users to measure and qualify both large and small complex geometries quickly and efficiently, yielding near real-time results. Dantec Dynamics’ sheaorgraphy systems offer users the significant advantage of live phase mapping during measurement acquisition.