FT-IR Optical Fiber Remote Detection of Aluminum Hydroxide by Evanescent Wave Absorption Spectroscopy

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Remote detection of very small amounts of aluminum hydroxide has been achieved with the use of evanescent wave absorption spectroscopy. Aluminum hydroxide is a principal corrosion product of aluminum. Five absorption bands have been recorded in the spectral range from 3350 to 3650 cm-1. The recorded positions, transition strengths, and widths of the absorption bands are in qualitative agreement with reference spectral data. A four-wavenumber-resolution Michelson interferometer and decoated 200-μm-core-diameter multimode chalcogenide optical fibers were combined to make the evanescent wave absorption measurements. One-to four-meter lengths of fiber were used with 15 to 25 cm of the fibers decoated. The technique is very sensitive and can detect a very small amount of aluminum hydroxide in contact with the decoated fiber core. This study is a valuable step in the development of a technique for monitoring industrial corrosion of aluminum alloys.

Keywords: ATR spectroscopy; Evanescent wave absorption spectroscopy; Remote fiber-optic sensing

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702953965344

Affiliations: 1: Department of Physics, College of William and Mary, Williamsburg, Virginia 23185 2: Geophysics Directorate, Phillips Laboratory, Hanscom AFB, Massachusetts 01731 3: NASA Langley Research Center, Hampton, Virginia 23681 4: Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia 23529

Publication date: September 1, 1995

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