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Proceedings Paper

Chirped Bragg grating Fabry-Perot interferometer for nanostrain measurement
Author(s): R. M. Silva; M. S. Ferreira; O. Frazão
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Paper Abstract

In this work, a simple real-static nanostrain sensor based on a Bragg grating structure is presented. The setup is constituted by a narrow linewidth laser as light source, an optical circulator and a photodetector. The sensing head is formed by a chirped Bragg grating inscribed in a standard single mode fiber (SMF-28) by the phase technique. The fiber face end is cleaved and coated with a silver mirror, obtaining a Fabry-Perot interferometer. It is observable that the fringes period increases along the grating, due to the chirp spectrum (0.4 nm/cm) characteristics. The laser is fixed in one slope region of the fringe pattern. When strain is applied, the optical power changes linearly. A sensitivity of 5.72 μW/με in a range of 2 με . The sensing head resolution is 70 nε for a measurement step of 875 nε.

Paper Details

Date Published: 26 July 2011
PDF: 6 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 800149 (26 July 2011); doi: 10.1117/12.892520
Show Author Affiliations
R. M. Silva, INESC Porto (Portugal)
M. S. Ferreira, INESC Porto (Portugal)
O. Frazão, INESC Porto (Portugal)

Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics
Manuel Filipe Costa, Editor(s)

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