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Proceedings Paper

Optical-fiber-based chemical sensors for detection of corrosion precursors and by-products
Author(s): Jennifer L. Elster; Jonathan A. Greene; Mark E. Jones; Timothy A. Bailey; Shannon M. Lenahan; William H. Velander; Roger VanTassell; William Hodges; Ignacio M. Perez
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Paper Abstract

Optical fiber sensors are a novel and ideal approach for making chemical and physical measurements in a variety of harsh environments. They do not corrode, are resistant to most chemicals, immune to electromagnetic interference, light weight, inherently small and have a flexible geometry. This paper presents recent test results using optical fiber long-period grating (LPG) sensors to monitor corrosion precursors and by-products. With the appropriate coating, the LPG sensor can be designed to identify a variety of environmental target molecules, such as moisture, pH, sulfates, chlorates, nitrates and metal-ions in otherwise inaccessible regions of metallic structures. Detection of these chemicals can be used to determine if the environment within a particular area of an airplane or infrastructure is becoming conducive to corrosion or whether the corrosion process is active. The LPG sensors offer a clear advantage over similar electrochemical sensors since they can be rendered immune to temperature cross-sensitivity, multiplexed along a single fiber, and can be demodulated using a simple, low-cost spectrum analyzer. By coating the LPG sensor with specially designed affinity coatings that selectively absorb target molecules, selective, real-time monitoring of environmental conditions is possible. This sensing platform shows great promise for corrosion by- product detection in pipe networks, civil infrastructure, process control, and petroleum production operations and can be applied as biological sensors for in-vitro detection of pathogens, and chemical sensors for environmental and industrial process monitoring.

Paper Details

Date Published: 23 February 1999
PDF: 7 pages
Proc. SPIE 3540, Chemical, Biochemical, and Environmental Fiber Sensors X, (23 February 1999); doi: 10.1117/12.339802
Show Author Affiliations
Jennifer L. Elster, F&S, Inc. (United States)
Jonathan A. Greene, F&S, Inc. (United States)
Mark E. Jones, F&S, Inc. (United States)
Timothy A. Bailey, F&S, Inc. (United States)
Shannon M. Lenahan, F&S, Inc. (United States)
William H. Velander, Virginia Polytechnic Institute and State Univ. (United States)
Roger VanTassell, Virginia Polytechnic Institute and State Univ. (United States)
William Hodges, Virginia Polytechnic Institute and State Univ. (United States)
Ignacio M. Perez, Naval Air Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 3540:
Chemical, Biochemical, and Environmental Fiber Sensors X
Robert A. Lieberman, Editor(s)

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