Extension of fiber optic grating sensor technology toward very high temperatures for structural monitoring

Eric Udd

doi:10.1117/12.716296

10 April 2007 Extension of fiber optic grating sensor technology toward very high temperatures for structural monitoring

Eric Udd

Author Affiliations +

Proceedings Volume 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007; 653003 (2007) https://doi.org/10.1117/12.716296
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

Fiber optic grating sensors can be used to measure a wide variety of environmental effects including multi-dimensional strain, pressure, temperature, and corrosion. Recently progress has been made in extending the operational temperatures of fiber gratings in quartz using femto-second fabrication techniques to limits that are associated with the mechanical integrity of the fiber itself and diffusion of fiber core materials. This allows the prospect of stable operation to temperatures in excess of 800 degrees C. These same fabrication techniques could be applied to sapphire and other high temperature materials enabling operation to temperatures in excess of 1500 degrees C. Another interesting aspect of the very short pulse fabrication techniques is that birefringence of the fiber gratings may be induced by the fabrication process which in turn may enable higher temperature multi-parameter fiber grating sensors than may be realized by using conventional polarization preserving quartz fibers with lower melting temperatures. If these processes to enable fiber gratings with birefringence can be used in higher temperature waveguides such as sapphire a new class of very high temperature multi-parameter fiber grating sensors could be realized.

Citation Download Citation

Eric Udd "Extension of fiber optic grating sensor technology toward very high temperatures for structural monitoring", Proc. SPIE 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007, 653003 (10 April 2007); https://doi.org/10.1117/12.716296

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KEYWORDS

Fiber optics sensors

Sensors

Temperature metrology

Composites

Fabrication

Polarization

Quartz

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