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6 August 2001 Static strain measurement with submicro strain resolution and large dynamic range using twin grating Fabry-Perot sensor
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Abstract
We present experimental results on testing a twin grating fiber optic sensor for measurement of static strain. The sensor is built with two identical Bragg gratings closely spaced in a single mode fiber. It produces a reflection spectrum modulated due to interference. Similar to traditional FBG sensors, strain of the fiber leads to the wavelength shift of the reflection spectrum. This shift can be determined precisely measuring phase changes for corresponding components of Fourier transform of the reflection spectrum. Such an approach allows an absolute strain measurement with an interferometric sensitivity. Resolution of 0.02 degree(s)C and 0.2(mu) (epsilon) was demonstrated experimentally for temperature and static strain measurements using a pair of 0.7mm long Bragg gratings with reflectivity of 1% each.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mikhail G. Shlyagin, Pieter L. Swart, Serguei V. Miridonov, Anatoli A. Chtcherbakov, Ileana Marquez Borbon, and Vasilii V. Spirin "Static strain measurement with submicro strain resolution and large dynamic range using twin grating Fabry-Perot sensor", Proc. SPIE 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (6 August 2001); https://doi.org/10.1117/12.435545
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