Simultaneous measurement of strain and temperature using interferometrically interrogated fiber Bragg grating sensors

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Ferreira, LA (Author) Other; Araujo, FM (Author) Other; Santos, JL (Author) FCUP; Farahi, F (Author) Other

Journal

Title: Optical Engineering

Vol. 39

Pages: 2226-2234

ISSN: 0091-3286

Publisher: SPIE

Indexing

ISI Web of Knowledge - 50 Citations

Scopus - 71 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-000-ZE7

DOI: 10.1117/1.1305493

Abstract (EN): The potential of different fiber Bragg grating pairs for simultaneous sensing of strain and temperature is analyzed. We demonstrate that interferometric interrogation of a fiber grating written in bow-tie fiber enables strain and temperature to be simultaneously determined. This is achieved by independent measurement of the shift in the wavelengths of the reflected light from the grating components along the fast and the slow axes of the hi-bi fiber. A detailed theoretical analysis is presented that includes the basic sensing principle, sensor design and demodulation scheme. The performance of the proposed technique in simultaneous measurement of temperature and strain is experimentally demonstrated and resolutions of +/-2.5 degrees C/root Hz and +/-26 mu epsilon/root Hz are obtained for a fiber with birefringence of B = 5.5 x 10(-4). (C) 2000 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)00808-4].

Language: English

Type (Professor's evaluation): Scientific