CHIRPED FIBER BRAGG GRATING CAVITY RING-DOWN FOR STRAIN SENSING USING AN OTDR

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Susana Silva (Author) FCUP; Passos, DJ (Author) Other; marques, mb (Author) FCUP; Frazao, O (Author) FCUP

Journal

Title: Microwave and Optical Technology Letters

Vol. 57

Pages: 1442-1444

ISSN: 0895-2477

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 9 Citations

Other information

Authenticus ID: P-00A-9DK

DOI: 10.1002/mop.29114

Abstract (EN): This work presents a fiber cavity ring down (CRD) configuration for the measurement of strain. An optical time-domain reflectometer (OTDR) was used to send impulses down into the fiber loop cavity, inside of which a chirped fiber Bragg grating was placed to act as a strain sensing element. This technique could provide strain results with both conventional CRD-based configuration and the OTDR. The CRD configuration provided a linear response to strain applied in the range 0-2000 epsilon, and a sensitivity of 1.34 ns/epsilon was obtained. For the same operation range, the OTDR interrogation allowed obtaining a periodic behavior due to fiber Bragg grating scanning of the wavelength peaks of the multimode laser source while increasing strain. It is shown that the OTDR interrogation method provide a ring-down time response of about 8 s which is a great improvement when compared to the conventional CRD configuration (23 s). (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1442-1444, 2015

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3