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15 November 1996 Optical fiber grating-based strain and corrosion sensors
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Optical fiber gratings have recently emerged as attractive sensors for non-destructive evaluation of materials and structures. We present photoinduced Bragg and long-period gratings (LPGs) for monitoring corrosion in aging infrastructure. These two sensors are described based upon fabrication techniques, sensing mechanisms, sensitivities, and cross sensitivities. It will be demonstrated that while Bragg gratings need to be prestrained to detect corrosion of metals, the modulation of the evanescent field of the cladding modes in-long-period grating can be employed for corrosion monitoring. It will also be shown that sensitivities of LPG-based corrosion sensors to ambient temperature fluctuations can be reduced significantly.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark E. Jones, Jonathan A. Greene, Vikram Bhatia, Tiffanie D'Alberto, Gregory A. Ten Eyck, Paul M. Schindler, Kent A. Murphy, and Richard O. Claus "Optical fiber grating-based strain and corrosion sensors", Proc. SPIE 2948, Nondestructive Evaluation for Process Control in Manufacturing, (15 November 1996);

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