Chirped Bragg Grating Fabry-Perot Interferometer for Nanostrain Measurement

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2011

Autores

Silva, RM (Autor) Outra; Ferreira, MS (Autor) Outra; Frazao, O (Autor) FCUP

Ata de Conferência Internacional

Título: International Conference on Applications of Optics and Photonics

International Conference on Applications of Optics and Photonics

Braga, Portugal, 3 a 7 de Maio de 2011

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-002-X96

DOI: 10.1117/12.892520

Abstract (EN): 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 mu W/mu epsilon in a range of 2 mu epsilon. The sensing head resolution is 70 n epsilon for a measurement step of 875 n epsilon.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6