Non-destructive testing (NDT) by laser shearography and fringe projection
Xiaoran Chen (Worcester Polytechnic Ins.), Morteza Khaleghi (WPI), Ivo Dobrev (Worcester Polytechnic Institute), Cosme Furlong (Worcester Polytechnic Institute)
Characterization and Imaging of Structural and Material Imperfections
Mon 2:40 - 4:00
Barus-Holley 191
Abstract Non-destructive testing (NDT) is critical to many precision industries because it can provide important information about the structural health of critical components and systems. In addition, NDT can also identify situations that could potentially lead to critical failures. Specifically, NDT by optical methods have become popular because of their non-contact and non-invasive nature. Shearography is a high-resolution optical NDT method for identification and characterization of structural defects in components and has gained wide acceptance over the last decade; however, as a drawback, shearography cannot locate the position of defects in 3D. To overcome this limitation, we are combining shearography with Fringe Projection (FP). FP allows high-speed, noncontact, full-field-of-view 3D shape measurements to enable the 3D localization of detected defects on the objects of interest. We show preliminary results obtained by combining shearography and FP to perform NDT in specific aerospace structures. Keywords: Crack detection, Fringe projection, Shearography, 3D shape measurements.