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This article introduces a fiber Bragg grating based technique which uses feature-guided waves to detect anomalies or defects in plate structures with transverse bends. We are able to obtain
This paper reviews the development of two common types of fiber optic sensors (fiber Bragg grating sensors and bend loss based fiber optic sensors) for geotechnical health monitoring,
Grating formation techniques play a crucial role in establishing the functional capabilities of optical fiber gratings. These techniques determine how the gratings
The behavior of reflective long-period fiber gratings depends on the magnitude of the phase shift near the reflective surface: an additional dip is formed in the 0-shift grating and the short
Abstract According to the symmetry of transmission matrix for non-uniform magneto-optic fiber Bragg gratings (MFBGs), the simulation model of the non-uniform MFBGs with bidirectional
In this example, a bend sensor based on fiber Bragg grating (FBG) is demonstrated. The change of both physical length and strain-dependent refractive index of the fiber, are calculated by altering the bend
This Letter presents a simple mathematical model developed from coupled-mode theory to describe the relationship between Bragg transmission loss (BTL), grating length, coupling coefficients, and
The effect of macrobending on fiber Bragg gratings (FBGs) in standard and specialist use single-mode fibers has been investigated for bend diameters down to 6 mm. The bend dependence of various
In particular, the cost of fibre Bragg grating (FBG) sensors has dropped over the last few years and robust fibre-optic monitoring systems suitable for SHM have become commercial off the
Diffraction Grating Overview Finite-Difference Time-Domain (FDTD) is a powerful numerical method for simulating diffraction gratings, where the grating element and working wavelength are close in size.
10.1 INTRODUCTION: WHY FIBER GRATINGS? Single mode fiber is often used for sensing when extreme sensitivity to the measurand is required. This is because this type offiber permits the
Abstract: A fiber-optic shape sensing based on 7-core fiber Bragg gratings (FBGs) is proposed and experimentally demonstrated. The investigations are presented for two-dimensional (2D) and three
To better apply fiber Bragg gratings (FBGs) to various bending required situations, good understanding of their bending characteristics is crucial. In this Letter, a theoretical model to describe the changes
Fiber Gratings Silica fibers can change their optical properties permanently when they are exposed to intense radiation from a laser operating in the blue or ultraviolet spectral region. This photosensitive
The comprehensive study of losses of the fundamental mode and their impact on the performance of single-mode optical fiber plays a crucial role in designing opti-cal fibers and devices.
Emerging as a de facto standard over the last decade, OptiGrating has delivered powerful and user-friendly design software for modeling integrated and fiber optic
The possibilities to induce regular, stationary stripe patterns with easily controllable wavenumber have been investigated with the aim to apply them in optical devices as gratings.
Abstract The paper presents the results obtained in simulation of fiber Bragg grating (FBG) and long-period grating (LPG) sensors and their applications. The optical properties of FBG and LPG are firstly