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Appl Opt. 2007 Mar 20;46(9):1392-6.

Simultaneous temperature and strain measurements performed by a step-changed arc-induced long-period fiber grating.

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Escola Superior de Tecnologia e Gestão, Avenida do Atlântico, 4900-348 Viana do Castelo, Portugal.


A compact sensor based on step-changed arc-induced long-period fiber gratings was implemented to discriminate between temperature and strain. The proposed sensor consists of a single long-period grating with two sections written consecutively in the SMF-28 fiber using the electric arc discharge technique. The two sections have the same period but different fabrication parameters. The operation of the sensor relies on the existence of a difference between the values of temperature and strain sensitivity of two neighboring resonances observed in the spectrum of the step-changed grating. The temperature and strain resolutions obtained for the sensor are 0.2 degrees C and 35 micro epsilon, respectively.

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