Monitoring shape change in compliant structures

Euan J. Rigg; Robert R. J. Maier; James S. Barton; Andrew John Moore; Julian D. C. Jones; Scott McCulloch; Andrew Wallwork; Gary Burnell

doi:10.1117/12.484229

22 July 2003 Monitoring shape change in compliant structures

Euan J. Rigg, Robert R. J. Maier, James S. Barton, Andrew John Moore, Julian D. C. Jones, Scott McCulloch, Andrew Wallwork, Gary Burnell

Author Affiliations +

Proceedings Volume 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems; (2003) https://doi.org/10.1117/12.484229
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

We describe an optical system to monitor small long-term changes in the shape of a surface by using a network of optical fibre Bragg grating strain gauges, for applications in which space does not permit the use of techniques such as photogrammetry or structured light methods. Gratings are bonded to copper beryllium strips held under tension in contact with the test surface. The copper beryllium strips enable sufficient force to be transferred to the optical fibre from the compliant surface. Shape changes are revealed as strain changes in the sensor strips, inferred from wavelength shifts in the Bragg peaks. The optical signals are obtained in reflection by illuminating the sensor fibres with a broadband source and using a scanning Fabry-Perot filter to generate the spectrum with a wavelength resolution of 0.3 pm over the range 1530 to 1570 nm. Laboratory tests show that a strain resolution of 8 microstrain can be achieved with temperature compensation over the range 20 to 50 C, with a multiplexing capability of between 11 and 16 temperature - strain sensor pairs, depending on temperature gradients on the test surface. We present experimental measurements on a cylindrical test object subject to diametral loading, and show a comparison with a finite element model.

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Euan J. Rigg, Robert R. J. Maier, James S. Barton, Andrew John Moore, Julian D. C. Jones, Scott McCulloch, Andrew Wallwork, and Gary Burnell "Monitoring shape change in compliant structures", Proc. SPIE 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems, (22 July 2003); https://doi.org/10.1117/12.484229

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KEYWORDS

Fiber Bragg gratings

Sensors

Temperature metrology

Finite element methods

Aluminum

Beryllium

Copper

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