Frequency-modulated multimode laser diode for fiber Bragg grating sensors

• Type: Article in International Scientific Journal
• Date: 1998

Authors

Ferreira, LA (Author) Other; Diatzikis, EV (Author) Other; Santos, JL (Author) FCUP; Farahi, F (Author) Other

Journal

Title: Journal of Lightwave Technology

Vol. 16

Pages: 1620-1630

ISSN: 0733-8724

Publisher: Optical Society of America

Indexing

ISI Web of Knowledge - 21 Citations

Scopus - 22 Citations

Scientific classification

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

Other information

Authenticus ID: P-001-775

DOI: 10.1109/50.712245

Abstract (EN): A demodulation scheme for fiber Bragg grating (FBG) sensors is presented. It is based on the generation of an electrical carrier by using a modulated multimode laser diode to illuminate the fiber grating. The change in Bragg wavelength is measured by tracking the phase of the carrier at the detector output in either an open- or a closed-loop scheme. A theoretical analysis of the interrogation technique in terms of linearity and dynamic range is presented. Experimental data were obtained for both strain and temperature measurements. Sensitivities of 0.7 mu epsilon/root Hz and 0.05 degrees C/root Hz were obtained over a dynamic range of approximate to 60 dB, The application of this demodulation scheme to a multiplexed sensing system is also demonstrated.

Language: English

Type (Professor's evaluation): Scientific