7 July 1995 Embeddable distributed moisture and pH sensors for nondestructive inspection of aircraft lap joints
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Abstract
Two distributed fiber optic sensors for use in the prevention and monitoring of corrosion in aircraft are described. These sensors, based on optical fibers that are intrinsically sensitive to either water or changes in pH, will alert maintenance personnel to the presence of water in lap joints and other inaccessible critical areas. Furthermore, the sensors can also locate precisely where the moisture infiltration has occurred. In a typical application, a sensor fiber would be embedded in a lap joint along the bottom panel of an aircraft's body, or on a wing, where water is likely to collect. Changes in the optical transmission through the fiber can be monitored either periodically or continuously to determine the extent of water penetration.
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Edgar A. Mendoza, Albert N. Khalil, Zongjian Sun, Daniel P. Robinson, Steven J. Syracuse, Claudio Oliveira Egalon, Michael F. Gunther, Robert A. Lieberman, "Embeddable distributed moisture and pH sensors for nondestructive inspection of aircraft lap joints", Proc. SPIE 2455, Nondestructive Evaluation of Aging Aircraft, Airports, Aerospace Hardware, and Materials, (7 July 1995); doi: 10.1117/12.213565; https://doi.org/10.1117/12.213565
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KEYWORDS
Sensors

Cladding

Fiber optics sensors

Polymers

Molecules

Semiconductor lasers

Corrosion

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