Automated processing of thermographic derivatives for quality assurance

Steven M. Shepard; Julin Hou; James R. Lhota; Joe Golden

doi:10.1117/1.2741274

1 May 2007 To reduce costs and facilitate automation in the automotive industry, adhesive bonding has gained popularity as a replacement for conventional mechanical fasteners such as bolts, screws, rivets, and welding. Adhesive bonding is particularly useful for bon

Steven M. Shepard, Julin Hou, James R. Lhota, Joe Golden

Author Affiliations +

Optical Engineering, Vol. 46, Issue 5, 051008 (May 2007). https://doi.org/10.1117/1.2741274

Abstract

The use of thermography as a nondestructive testing method has increased significantly in recent years. However, implementation is usually based on visual interpretation of image results by a trained inspector. Although this is accepted practice in the aerospace industry, where thermography is widely used, it is not appropriate for automotive manufacturing, where higher production rates demand higher inspection throughput that can only be accomplished with automated detection. The logarithmic derivatives of flash thermography time histories provide an excellent basis for automated detection. A unique model, based on the logarithmic derivatives of a series solution for the surface temperature of a flash heated plate with adiabatic boundary conditions, provides a template for identifying pixels that deviate from uninterrupted diffusion that is characteristic of a defect-free sample. We demonstrate automated defect detection using this model on a composite sample.

©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Steven M. Shepard, Julin Hou, James R. Lhota, and Joe Golden "To reduce costs and facilitate automation in the automotive industry, adhesive bonding has gained popularity as a replacement for conventional mechanical fasteners such as bolts, screws, rivets, and welding. Adhesive bonding is particularly useful for bon," Optical Engineering 46(5), 051008 (1 May 2007). https://doi.org/10.1117/1.2741274

Published: 1 May 2007

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