Postprocessing

Gasturbinesusedinaircraftareoperatedinavarietyofenvironmentsrangingfromarctictodesertconditions.Desertareaspresentaparticularchallengetogasturbineoperationbecauseofparticulatematterthatcanbeingestedintotheengine,whentheengineoperatesneargroundlevel.Predictionsofparticulateladenflowswiththeaccountofturbulentviscousfluidsarecomplexphysicsandcanbeapproachedintwoways–Onewayortwowaycoupling.

This paper treats an experimental study that focusses on optical infrared thermography for non-destructive testing of composites through lock-in and flash excitation. Different fiber reinforced plastics with various artificial defects have been investigated. Three different postprocessing techniques are applied, namely fast Fourier transform (FFT), principal component analysis (PCA) and thermographic signal reconstruction (TSR). A comparison between the different excitation and post processing methods is performed, and their strengths and weaknesses in detecting artificial defects in composites are evaluated and discussed.