Feasibility Demonstration of Using Pulse Laser Holographic Techniques to Inspect Naval Aircraft Engine Components.

摘要

The feasibility of employing pulsed laser holographic interferometric inspection techniques to inspect turbine blades was investigated. Pulsed laser techniques allow holographic inspection to be deployed in other than a laboratory environment such as in an air rework or maintenance facility. Holographic testing was performed using individual TF41 HP1 turbine blades and assembled T56 HP1 turbine wheels. Several different optical configurations and dyanmic loading procedures were evaluated. Inspection of blades in a fully assembled wheel showed that locations of artificial cracks in the airfoil surface which were on the order of 0.050 long could be clearly resolved when using a transient loading technique. (Author)