Temperature and Strain Sensing With Femtosecond Laser Written Bragg Gratings in Defect and Nondefect Suspended-Silica-Core Fibers

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Luis Andre Fernandes (Author) Other; Martin Becker (Author) Other; Orlando Frazao (Author) FCUP; Kay Schuster (Author) Other; Jens Kobelke (Author) Other; Manfred Rothhardt (Author) Other; Hartmut Bartelt (Author) Other; Jose Luis Santos (Author) FCUP; Paulo V S Marques (Author) FCUP

Journal

Title: IEEE Photonics Technology Letters

Vol. 24

Pages: 554-556

ISSN: 1041-1135

Publisher: IEEE

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 20 Citations

Scientific classification

FOS: Engineering and technology > Electrical engineering, Electronic engineering, Information engineering

Other information

Authenticus ID: P-002-BSS

DOI: 10.1109/lpt.2012.2183344

Abstract (EN): The spectral behavior in the C-band of fiber Bragg gratings (FBGs) was analyzed as a function of temperature and strain. The FBGs were fabricated in pure silica four-leaf-clover- shaped suspended-core fibers by (DUV) femtosecond laser exposure (3.6 W at 800 nm, 130 fs, 1 kHz frequency tripled to 350 fs, 650 mW at 267 nm). A defect fiber (with a hollow hole in the core) and nondefect fiber were compared both yielding approximate to 1 pm/mu epsilon sensitivity to strain but different sensitivity to temperature (from 3.0 pm/degrees C to 8.4 pm/degrees C for the defect fiber and 10 pm/degrees C for the nondefect fiber). The 16% to 70% relative difference between the thermal coefficients of the two fibers, together with their similar strain sensitivity enables the simultaneous measurement of strain and temperature.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3