Article: Evaluation of carbon-based surfaces.(Testing and measurement)

Researchers at Wichita State University's National Institute for Aviation Research, Kansas, USA, have developed a non-destructive method for the evaluation of moisture content in carbon-based composites prior to adhesive bonding.

Fibre-reinforced plastics absorb water in their resin phase, mostly during use or in storage under a humid atmosphere. Before a strong bond can be formed, the composite must be thoroughly dried.

Water dissolved in plastic produces a unique and reproducible signature in the near-infrared (IR) spectrum. For this reason, the researchers investigated a near IR integrating sphere module, built for use with a research-grade IR ...

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