Sensitivity of a long-period optical fiber grating bend sensor

Abstract

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Spectral modelling of curved long-period fibre gratings

“…A resonance is shifted to different wavelengths along the length of the grating due to the variable tilt of the period and, therefore, the total width will be the sum of the initial width and the shift due to bending. Modelling is in good agreement with experimental data presented by Rathje et al [3] (figure 8); for example, if a bending shift of 1 nm and an initial width of 4 nm are considered, the final width will be 5 nm.…”

“…Long-period fibre gratings (LPFGs) are fibre devices that can be used in lasers as narrow line-width reflectors, in optical communications for wavelength division multiplexing or compensation for dispersion and as strain, temperature or refractive index transducers [1] because of the large sensitivity of their transmission spectrum to external effects. Concerning bending of LPFGs, several authors have evaluated experimentally the performances of these optical devices under various curvatures and their sensitivities to bending have been reported [2,3]. However, to the best of our knowledge, no analysis of curved LPFGs has been carried out fully.…”

“…However, to the best of our knowledge, no analysis of curved LPFGs has been carried out fully. Most of the few papers which refer to bending of LPFGs are mainly focused on showing the effects experimentally rather than theoretically [2,3].…”

Drug-Induced T-Wave Morphology Changesn

“…A bend direction asymmetry has been demonstrated for the resonance wavelength shift in one direction [63,64]. It is possible therefore by combining a minimum of two LPGs to create a directional bend sensor [65].…”

Fiber-optical grating sensors for wind turbine blades: a review

“…55,56 Based on this, it is possible with a combination of two or more LPGs to construct a bendsensor to measure both the direction and magnitude of a bend. 57 When an LPG is bending, new dips in the spectrum appear.…”