Recent advances in devices and applications of high-birefringence fiber loopmirror sensors are addressed. In optical sensing, these may be used as strain andtemperature sensors, a separate or simultaneous measurement. Other describedapplications include: refractive index measurement, filters for interrogate gratingsstructures chemical etching control. The paper analyses compares different types ofhigh-birefringence loop mirror using conventional microstructured opticalfibers. Some...

This work presents an optical sensor based on a highly birefringent photonic crystal fiber (Hi-Bi PCF) loop mirror. The length of the sensing head is 380 mm and its corresponding wavelength spacing between two interferometer minima 8 nm. was characterized in strain temperature with uncoated Hi-Bi PCF acrylate coated PCF. Different results for sensitivity were obtained. Relatively to measurement, slightly less (1.11 ) when compared (1.21 ). For measurement PCF, insensitive (0.29 pm/K).

This work presents an alternative solution for simultaneous measurement of strain and temperature. The sensing head is formed by a long-period fiber grating combined with high-birefringence loop mirror resulting in configuration capable temperature discrimination. These optical devices have opposite sensitivity responses when variation and/or applied. Maximum errors plusmn0.8degC plusmn21muepsiv are reported over 60 degC 700-muepsiv ranges, respectively

A Sagnac interferometer with a section of polarization maintaining side-hole fiber for multiparameter measurement is proposed. The sensor was experimentally demonstrated to be sensitive torsion, temperature, and longitudinal strain, simultaneously. birefringence in the investigated induced simultaneously by elliptical shape germanium-doped core field overlap air holes surrounding core. latter effect purely geometrical causes high chromatic dispersion group long wavelength range, which...

An all fiber Mach-Zehnder interferometer using suspended twin-core is described. Due to the birefringence of cores, two interferometers are obtained when illuminated by a polarized light. Applying curvature or temperature sensing head, different sensitivities observed. In order discriminate from in sensor, matrix method used.

A curvature sensor based on a highly birefringent (Hi-Bi) photonic crystal fiber inserted into Sagnac interferometer is demonstrated. For this purpose, novel Hi-Bi was designed and fabricated. Half of the microstructured region composed by large diameter holes, while other half contained small holes. Because geometry, core shifted from center high birefringence appears in optical fiber. Curvature applied for three different directions range 0.6-5 m(-1). Temperature longitudinal strain also...

A fiber-optic sensor for torsion measurement, based on a two-linearly polarized (LP)-mode operation in ultrahigh birefringent photonic crystal fiber is described. The structure of the presents two large asymmetric holes adjacent to core fiber. When linearly light injected <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</i> - and xmlns:xlink="http://www.w3.org/1999/xlink">y</i> -directions, respectively, separate interferometers can be obtained....

A fiber-optic curvature sensor based on a core offset single-mode fiber (SMF) combined with Bragg grating (FBG) is presented. The FBG cladding modes are efficiently excited by the large misalignment. of can be obtained ratio between recoupled mode power and reflected power. These measurements independent from temperature variation.

Recently, many programs have been developed for simulation or analysis of the different parameters light propagation in optical fibers, either sensing communication purposes. In this paper, it is shown COMSOL Multiphysics as a fairly robust and simple program, due to existence graphical environment, perform simulations with good accuracy. Results are compared other analysis, focusing on surface plasmon resonance (SPR) phenomena refractive index D-type fiber, where characteristics material...

This paper presents the performance analysis of a sensing configuration refractive index, based on surface plasmon resonance (SPR) in microstructured D-type optical fiber with thin gold layer, using finite-element method. The is analyzed terms loss and distribution Poynting vector. results are compared conventional SPR sensor for index measurement. simulation show an improvement sensitivity resolution (10 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Abstract In our study, we conducted a thorough analysis of the spectral characteristics D-shaped surface plasmon resonance (SPR) photonic crystal fiber (PCF) refractive index sensor, incorporating full width at half maximum (FWHM) analysis. We explored four distinct plasmonic materials-silver (Ag), gold (Au), Ga-doped zinc oxide (GZO), and an Ag-nanowire metamaterial-to understand their impact on sensor performance. Our investigation encompassed comprehensive theoretical modeling analysis,...

An optical refractometer based on a birefringent (Hi-Bi) fiber Bragg grating (FBG) written in new H-shaped structure is proposed. This formed by opening the two holes of side-hole using chemical etching. When Hi-Bi FBG immersed different liquids, responses slow and fast wavelengths are obtained. The also capable simultaneous measurement refractive index temperature.

A fiber-optic Fabry-Perot sensing structure based on the utilization of a suspended-core fiber is presented. The interferometric formed when small length spliced to end standard single-mode fiber. interfering waves are generated by refractive-index mismatches between two fibers in splice region and at Thermal strain responses different heads associated with three four holes characterized.

In this work, a Raman fibre Bragg-grating laser sensor for strain–temperature measurement is presented. The resonator linear cavity formed by the reflectivity of Bragg gratings and virtual distributed mirror from cooperative Rayleigh scattering in dispersion-compensating created effect. Using one pump it possible to obtain with range ∼35 nm. sensing system demonstrated when are remotely located at 10 km distance.

A fiber-optic sensor for simultaneous measurement of refractive index and temperature is described. The based on the visibility variations a Fabry-Pérot interferometer. It formed with interfering waves generated from low reflectivity Bragg grating inscribed Panda fiber end tip (Fresnel reflection) in contact liquid. characterized by immersing distilled water different concentrations ethylene glycol. linear relation interferometer fringe variation observed. determined wavelength shift FBG...

This paper presents an optical fiber sensor, that uses surface plasmon resonance on metallic wires to directly and simultaneously measure both the refractive index temperature. The sensor is constituted by gold a D-type engineered, using numerical simulations based finite-element method support modes with strong dependencies either one of measured parameters. In particular, influence temperature structure results from contributions thermo-optic effect in core sensing layer, phonon-electron...

In this letter, a new configuration for simultaneous strain and temperature discrimination is presented using two concatenated high-birefringence (Hi-Bi) fiber loop mirrors. The first mirror includes Hi-Bi photonic crystal fiber, while the second one contains length of internal elliptical cladding fiber. It shown that by monitoring wavelength optical power peaks system spectral transfer function, it possible to obtain information permits measurement temperature.

A review of refractive index measurement based on different types optical fiber sensor configurations and techniques is presented. It addresses the main developments in area, with particular focus results obtained at INESC Porto, Portugal. The sensing structures studied include those Bragg long period gratings, micro-interferometers, plasmonic effects fibers multimode interference a large spectrum standard microstructured fibers.

Abstract A fiber optic sensing system for simultaneous measurement of refractive index and temperature, based on a hybrid Bragg grating/long-period grating arrangement is described. The experimental results show that this setup has good performance in terms linearity sensitivity, the ratiometric output changes 4%/0.001 RIU 3.6%/°C, respectively. sensor resolution ≈2 × 10−5 RIU. temperature was demonstrated. configuration ability to be read-out reflection works telecommunications window.