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TitleOptics-based strain sensing system
Publication TypeBook
Year of Publication2012
AuthorsStevens, K.J., Williams G.V.M., Monfils I., Hirst D., Wagner P., Raymond S.G., Quilty J.W., and Do M.T.T.
Series TitleMaterials Science Forum
Number of Pages178 - 181
ISBN02555476 (ISSN); 9783037852637 (ISBN)
Keywords1550 nm, Bragg gratings, Dynamic strain, Electrical resistances, Fiber Bragg gratings, Fibers, Gages, Instron, Mechanical testing, Mechanical testing machines, Microstrains, Multiple sensors, Nanotechnology, Optical fibers, Optical interrogator, Optics, Sensors, Stainless steel, Steel testing, Strain, Strain sensing, Strain sensing systems, Strain sensors, Strain tensor, Temperature compensation, Temperature drifts
AbstractAn optics-based strain sensing system is being developed for quazi-distributed strain sensing in locations and environments that are not accessible to conventional strain sensors. The system comprises an Optical Interrogator that has been designed and constructed by Southern Photonics [1], and optical fibre coupled Bragg grating strain sensors. It has been tested using commercial fibre Bragg gratings [2] that were attached to 2 samples of 316 grade stainless steel and cycled in strain and temperature using an Instron mechanical testing machine and temperature controlled cabinet. The results have been compared to the performance of conventional electrical resistance strain gauges. Pairs of fibre Bragg gratings were simultaneously interrogated at 1540 and 1550 nm centre wavelengths to demonstrate the ability of the system to use multiple sensors for quazi-distributed sensing and temperature compensation. The Optical Interrogator resolution is approximately 4 microstrains, accounting for longer term temperature drift, and it is capable of resolving dynamic strains at rates of up to 90 Hz. © (2012) Trans Tech Publications, Switzerland.

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