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Micro-displacement measurement using a long period fiber grating in a self-referenced fiber optic intensity sensor

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6 Author(s)
Cazacu, S. ; Dep. de Engenharia Electrotecnica, Inst. Superior de Engenharia do Porto, Portugal ; Martins, J.M. ; Rego, G. ; Santos, S.F.
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This work describes a sensor, in which the sensing head comprises a long period fiber grating (LPG) whose attenuation peak varies as function of its bending. The level of LPG bending is induced by the displacement of a micrometer translation stage (MTS) being possible therefore to measure microdisplacements. The sensing head is integrated in a fiber optic intensity sensor, referenced in frequency, which is immune to intensity fluctuations other than the ones caused by the LPG.

Published in:

Lasers and Electro-Optics Society, 2004. LEOS 2004. The 17th Annual Meeting of the IEEE  (Volume:1 )

Date of Conference:

7-11 Nov. 2004