Fiber Bragg grating strain gauge rosette with temperature compensation

Frank M. Haran; Jason K. Rew; Peter D. Foote

doi:10.1117/12.316977

21 July 1998 Fiber Bragg grating strain gauge rosette with temperature compensation

Frank M. Haran, Jason K. Rew, Peter D. Foote

Proceedings Volume 3330, Smart Structures and Materials 1998: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (1998) https://doi.org/10.1117/12.316977
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

We will describe the construction of a fiber optic strain gauge rosette (FOSGR) using four in-line fiber Bragg gratings (FBGs). These FBGs are formed into a triangular- shaped loop structure. The first three FBGs are orientated at 0 degrees, 60 degrees, and 120 degrees. The final grating, which is at the end of the loop, is isolated from strain and acts as a temperature sensor. Using this independent temperature sensor, the temperature cross sensitivity of the strain sensing gratings can be factored out.Moreover, the inclusion of temperature sensing allows this optical strain gauge to be used on any structural material with arbitrary thermal properties. This FOSGR has been attached techniques. This paper describes experimental results obtained from a FOSGR that has been mounted on an aluminium test piece, which has been subjected to both compressive and tensile loads. Also shown are the temperature characteristics of a FOSGR.

Citation Download Citation

Frank M. Haran, Jason K. Rew, and Peter D. Foote "Fiber Bragg grating strain gauge rosette with temperature compensation", Proc. SPIE 3330, Smart Structures and Materials 1998: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (21 July 1998); https://doi.org/10.1117/12.316977

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