26 July 2011 Chirped Bragg grating Fabry-Perot interferometer for nanostrain measurement
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Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 800149 (2011) https://doi.org/10.1117/12.892520
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal
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.
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R. M. Silva, M. S. Ferreira, O. Frazão, "Chirped Bragg grating Fabry-Perot interferometer for nanostrain measurement", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 800149 (26 July 2011); doi: 10.1117/12.892520; https://doi.org/10.1117/12.892520
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