On the possible use of optical fiber Bragg gratings as strain sensors for geodynamical monitoring

Year: 2002

Authors: Ferraro P., De Natale G.

Autors Affiliation: Istituto Nazionale di Ottica Applicata, Sez. di Napoli, c/o Instituto di Cibernetica del CNR, ‘‘Eduardo Caianiello’’, Compr. ‘‘A. Olivetti’’, Fabbr. 70, Via Campi Flegrei 34, 80078 Pozzuoli (Na), Italy;
INGV-Osservatorio Vesuviano, Via Diocleziano, 328, 80124 Naples, Italy

Abstract: Optical fiber sensors can be used to measure manydifferent parameters including strain, temperature, pressure, displacement, electrical field, refractive index, rotation, position and vibrations. Among a varietyof fiber sensors, fiber Bragg gratings (FBG) have numerous advantages over other optical fiber sensors. One of the major advantages of this type of sensors is attributed to wavelength-encoded information given bythe Bragg grating. Since the wavelength is an absolute parameter, signal from FBG maybe processed such that its information remains immune to power fluctuations along the optical path. This inherent characteristic makes the FBG sensors veryattractive for application in harsh environments, ‘‘smart structures’’ and on-site measurements. This paper reviews the achievements about the FBG as a strain and temperature sensor and describes the potential applications of FBG sensors for applications in the field of geophysics and its expected development in the near future. The applications could include: rock deformation, fiber-optic geophone, optical based seismograph, vertical seismic profiling and structural monitoring of civil structures. Different techniques to detect strains and various applications will be reviewed and discussed. The problem of temperature–strain cross sensitivity, that is particularly difficult to eliminate, is addressed and approaches to overcome it are discussed.

Journal/Review: OPTICS AND LASERS IN ENGINEERING

Volume: 37 (2-3)      Pages from: 115  to: 130

KeyWords: Fiber Bragg gratings; Wavelength-encoded information; Strain sensor; Temperature sensor;
DOI: 10.1016/S0143-8166(01)00141-5

Citations: 106
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