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The objective of any system of nondestructively examining an adhesive joint is to obtain a direct correlation between the strength of the joint (howsoever defined) and some mechanical, physical, or chemical parameter which can readily be measured without causing damage to the joint. Faults may be defined as anything which could adversely affect the short- or long-term strength of a joint. There are two basic areas for examination in properly made joints, the cohesive strength of the polymeric adhesive, and the adhesive strength of the bond between the polymer and the substrate. In addition, voids, disbonds, and porosity create an additional issue for inspection.