Home / Sensitivity of Long-Period Fiber Bragg Gratings
8 nm/°C in the range of 5–30 °C was achieved for this new sensor, and the resolution is about 0. 00026 °C, which is over 20 times higher than ordinary temperature sensors. This article explains what fiber Bragg gratings (FBGs) are: periodic modulations of the refractive index in a fiber core which reflect a narrow wavelength band according to the Bragg condition λ = 2 n eff Λ. The proposed sensor includes several sensing heads, each of which is composed of a long-period grating (LPG) and a fiber Bragg grating. Small-period long-period gratings (SP-LPGs) allow the excitation of higher-order cladding modes, providing enhanced sensitivity and improved.
We present a detailed investigation into the sensitivity of long-period fiber gratings (LPFGs) as a function of temperature, strain, and surrounding refractive index, with particular attention to the higher order
Read MoreThe strain response of a long-period fibre grating arise due to the physical elongation of the fibre, changing the grating pitch and the effective refractive index of the core and cladding due to the
Read MoreMany structures have been applied for glucose sensing, such as those based on gratings , d-shaped and Interferometers accordance with Fiber Bragg Gratings (FBG) and
Read MoreAmong the various architectures, Fiber Bragg Gratings (FBGs) and Long Period Gratings (LPGs) , are par-ticularly noteworthy due to their unique working principles and versatility across multiple
Read MoreA high-sensitivity hot-wire anemometer is proposed for use with a cobalt-doped fiber (CDF) based long-period grating (LPG) heated optically by a 1480 nm laser. The CDF-LPG absorbs laser power and
Read MoreUnlike existing reviews on fiber Bragg grating sensors and optical fiber sensing technologies, which typically focus on general sensing principles, specific application domains, or isolated aspects of
Read MoreThe primary types include uniform, chirped, tilted, and phase-shifted FBGs, each serving distinct applications in sensing, telecommunications, and laser systems. Uniform Fiber Bragg Gratings The
Read MoreA fiber Bragg grating works by introducing a periodic refractive-index pattern into the fiber core. That pattern causes many tiny reflections, and at one specific wavelength those reflections add
Read MoreMagnetic fluids have various optical properties, such as tunable refractive index, tunable transmittance, birefringence, and the Faraday effect. As a result, they have many applications in
Read MoreThis fiber laser configuration was recently improved by Kuikui Guo et al. ; here, the authors set a phase-shifted fiber Bragg grating, as a result,
Read MoreThis paper investigates, for the first time, to the best of our knowledge, the temperature dependence of the dispersion curves in order to find the optimum
Read MoreIadicicco et al. reported an etched fiber Bragg grating RI measurement, while etching can also be applied to a long period of grating to increase sensitivity to external refractive indices .
Read MoreOptical fiber sensors (OFSs) have emerged as essential tools in the monitoring of physical, chemical, and bio-medical parameters in harsh situations
Read MoreThe fiber Bragg grating (FBG) sensors have some additional advantages over conventional electrochemical sensors, such as low
Read MoreIn this study, a new temperature sensor with high sensitivity was achieved by four-layer Ge and B co-doped long-period fiber grating (LPFG)
Read MoreAn LP11-mode output all-fiber laser was presented, utilizing long-period fiber gratings (LPFGs) and polarization-maintaining optical fiber (PMF). The LPFG was designed and fabricated,
Read MoreIn this paper, we devise a super absorbent polymer (SAP)-coated ultra-weak fiber Bragg grating (UWFBG) strain sensing cable that can detect and localize water leakage in long tunnels with
Read MoreThis study investigates the sensitivity of fiber Bragg grating (FBG) sensors for structural health monitoring of reinforced concrete structures, with a focus on the influence of sensor mounting
Read MoreFiber Bragg Grating (FBG) sensors are a promising alternative, but their simultaneous response to both temperature and strain (cross-sensitivity) has hindered their application.
Read MoreWith this approach, a new force sensor made up of a 1mm Fiber Bragg Grating (FBG) attached to a 3mm long nitinol tube was developed to measure the compression force exerted on the
Read MoreDecades have passed since the first demonstration of a long-period fiber grating (LPFG) and its practical application for sensors, and, in this period, manufacturing techniques, sensitivity
Read MoreIn this study, we experimentally demonstrated that a high-sensitivity fiber sensor can be used for the remote sensing of temperature and stress simultaneously. The proposed sensor includes several
Read MoreWearable data gloves often suffer from electromagnetic interference, insufficient substrate stability, and limited capability for multi-degree-of-freedom motion measurement. To address these
Read MoreWhile the majority of radiation-tolerant fiber optic sensor research has centered on FBGs, it is equally important to consider Long Period Gratings (LPGs), which are closely related in structure
Read MoreTaking typical fiber grating structures as an example, long period gratings (LPGs) are inscribed on the fiber surface, making them more suitable for direct RI sensing.
Read MoreLong-period gratings (LPGs) are promising photonic chemical sensors since they can excite cladding modes that interact with the surrounding medium. Small-period long-period gratings
Read MoreFiber Bragg gratings are reflective structures in the core of an optical fiber with a periodic or aperiodic perturbation of the effective refractive index.
Read MoreHowever, the sensitivity of LPGs to strain remains an open question for two reasons. Firstly, LPGs are complex systems which contain several independent parameters. Most published
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