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Chirped fiber bragg grating cavity ring‐down for strain sensing using an OTDR
Author(s) -
Silva Susana,
Passos Daniel J.,
Marques Manuel B.,
Frazão Orlando
Publication year - 2015
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.29114
Subject(s) - fiber bragg grating , optical time domain reflectometer , optics , materials science , multi mode optical fiber , fiber , optical fiber , fiber optic sensor , optoelectronics , polarization maintaining optical fiber , physics , composite material
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 με, and a sensitivity of 1.34 ns/με 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 μs which is a great improvement when compared to the conventional CRD configuration (23 μs). © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1442–1444, 2015