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Proceedings Paper

Static strain measurement with submicro strain resolution and large dynamic range using twin grating Fabry-Perot sensor
Author(s): Mikhail G. Shlyagin; Pieter L. Swart; Serguei V. Miridonov; Anatoli A. Chtcherbakov; Ileana Marquez Borbon; Vasilii V. Spirin
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Paper 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.

Paper Details

Date Published: 6 August 2001
PDF: 8 pages
Proc. SPIE 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (6 August 2001); doi: 10.1117/12.435545
Show Author Affiliations
Mikhail G. Shlyagin, CICESE (United States)
Pieter L. Swart, Rand Afrikaans Univ. (South Africa)
Serguei V. Miridonov, CICESE (Mexico)
Anatoli A. Chtcherbakov, Rand Afrikaans Univ. (South Africa)
Ileana Marquez Borbon, CICESE (United States)
Vasilii V. Spirin, CICESE (United States)


Published in SPIE Proceedings Vol. 4328:
Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Eric Udd; Daniele Inaudi, Editor(s)

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