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Proceedings Paper

Evanescent wave absorption measurements of corroded materials using optical fibers as remote probes
Author(s): Juock Namkung; Mike Hoke; Andy Schwartz
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Paper Abstract

This research effort is intended to demonstrate an in-situ optical fiber corrosion sensor that operates in conjunction with a Fourier Transform Infrared (FTIR) interferometer as an evanescent wave absorption spectroscopic technique. This technique will allow periodic remote sensing for onboard structural health monitoring of areas of normally inaccessible structural components. The potential advantages of optical fiber sensors result from the fact that the sensing element, the optical fiber, can be embedded in junctions in aircraft structures, in locations where humidity and corrosion can accumulate, but are such that they can not be directly observed. A fiber-optic-FTIR experimental setup, including several samples of field corrosion material has been assembled in the laboratory to spectrally detect Aluminum Hydroxide [Al(OH)3] which is one component of corrosion of aluminum. Absorption spectra of Al(OH)3, have been collected using an Attenuated Total Reflection (ATR) crystal as a reference spectral signature. The spectra of samples from a simulated corrosion process have been collected and compared with Al(OH)3 spectra. The laboratory experimental setup has included samples from the controlled corrosion conditions.

Paper Details

Date Published: 20 April 2010
PDF: 6 pages
Proc. SPIE 7675, Photonics in the Transportation Industry: Auto to Aerospace III, 767502 (20 April 2010); doi: 10.1117/12.864471
Show Author Affiliations
Juock Namkung, Naval Air Systems Command (United States)
Mike Hoke, Air Force Research Lab. (United States)
Andy Schwartz, Naval Air Systems Command (United States)

Published in SPIE Proceedings Vol. 7675:
Photonics in the Transportation Industry: Auto to Aerospace III
Alex A. Kazemi; Bernard C. Kress; Eric Y. Chan, Editor(s)

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