Interrogation of a fiber Bragg grating using a mechanically induced long-period fiber grating

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Gaspar M Rego (Author) Other; Henrique M Salgado (Author) FEUP; Jose L Santos (Author) FCUP

Journal

Title: IEEE Sensors Journal

Vol. 6 No. 6

Pages: 1592-1595

ISSN: 1530-437X

Publisher: IEEE

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 23 Citations

Scientific classification

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

CORDIS: Technological sciences > Engineering > Electrical engineering

Other information

Authenticus ID: P-004-FPX

DOI: 10.1109/jsen.2006.883850

Abstract (EN): A fiber-sensing scheme with controlled sensitivity comprising a fiber Bragg grating (FBG) and a mechanically induced long-period fiber grating (MLPFG) is presented. The FBG was written by exposing the fiber to 248-nm UV laser radiation such that the Bragg wavelength is localized on the slope of a resonant band of a mechanical grating, which was produced by winding a nylon string around a fiber/grooved tube set. The strength of that resonant band was altered by applying loads to the MLPFG. For different loads, the FBG was submitted to strain values of up to 2200 mu epsilon, in steps of 200 mu epsilon, during which the Bragg wavelength and the respective transmitted peak power through the MLPFG were recorded. It was demonstrated that by applying a weight with a value of 0.78 kg to the MLPFG, the sensitivity of the FBG interrogation technique to strain variations increased from 2.23 (without load) to 3.20 pW/mu epsilon.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4