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Proceedings Paper

A differential detection scheme of spectral shifts in long-period fiber gratings
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Paper Abstract

In this work we present an analysis of the response of a compact, simple and inexpensive optoelectronic sensor system intended to detect spectral shifts of a long-period fiber grating (LPG). The system makes use of a diffraction grating and a couple of receiving optical fibers that pick up signals at two different wavelengths. This differential detection system provides the same useful information from an LPG-based sensor as with a conventional laboratory system using optical spectrum analyzers for monitoring the minimum offset of LPG. The design of the fiber detection pair as a function of the parameters of the dispersion grating, the pick-up fiber and the LPG parameters, is presented in detail. Simulation of the detection system responses is presented using real from spectral shifts in nano-coated LPGs caused by the evaporation of various liquids such as water, ethanol and acetone, which are examples of corrosive, flammable and hazardous substances. Fiber optic sensors with similar detection can find applications in structural health monitoring for moisture detection, monitoring the spillage of toxic and flammable substances in industry etc.

Paper Details

Date Published: 18 January 2011
PDF: 9 pages
Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 77470S (18 January 2011); doi: 10.1117/12.882083
Show Author Affiliations
Katerina Zhelyazkova, The Paissi Hilendarski Univ. of Plovdiv (Bulgaria)
Tinko Eftimov, The Paissi Hilendarski Univ. of Plovdiv (Bulgaria)
Mateusz Smietana, Warsaw Univ. of Technology (Poland)
Wojtek Bock, Univ. du Québec en Outaouais (Canada)


Published in SPIE Proceedings Vol. 7747:
16th International School on Quantum Electronics: Laser Physics and Applications

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