Chirped Bragg Grating Fabry-Perot Interferometer for Nanostrain Measurement

• Type: Article in International Conference Proceedings Book
• Date: 2011

Authors

Silva, RM (Author) Other; Ferreira, MS (Author) Other; Frazao, O (Author) FCUP

Conference proceedings International

Title: 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

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Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6