Laser Testing Methods (LM)
Laser testing includes three techniques: Holography, Shearography and Profilometry. All three techniques use lasers to perform the inspections. Laser NDT methods based on interferometic imaging, primarily holography and shearography have seen growing acceptance since the mid 1980’s. With a large increase in the use of composite materials and sandwich structures, the need for high speed, large area inspection for fracture critical, sub-surface defects such as disbonds, delaminations, sheard core or non-visible damage in aircraft, missiles and marine composites lead to broad acceptance of laser based NDT methods. Laser NDT methods employing holography and shearography imaging interferometers compliment UT, Thermography and other NDT methods as highly developed, mature and cost effective technology.