This paper presents the design, fabrication, and characterization of two compact fiber-optic current sensors (FOCS) based on fiber Bragg gratings (FBG) magnetostrictive alloy Terfenol-D. Finite-element-method (FEM) simulations assisted key optimizations in geometry similar FOCS proposed previously, allowing implementation magnetic flux density concentration techniques that resulted using very small amounts Two prototypes with same size were manufactured for performance comparison purposes,...

In this letter, we performed finite element method (FEM) simulations, fabrication, and experimental characterization of two prototypes fiber-optic current sensors (FOCS) based on fiber Bragg grating (FBG) Terfenol-D for monitoring in high-voltage transmission lines. The proposed were designed geometrical configurations that allowed a massive reduction more than 98% the amount employed compared to FBG-based FOCS previously. Using only 5.6 2.0 g each prototype, show not cost sensor can be...

Conventional methods for pathogen detection in water rely on time-consuming enrichment steps followed by biochemical identification strategies, which require assay times ranging from 24 hours to up a week. However, recent years, significant efforts have been made towards the development of biosensing technologies enabling rapid and close-to-real-time waterborne pathogens. In previous studies, we developed plastic optical fiber (POF) immunosensor using an optoelectronic configuration...

In this paper, a temperature-independent technique for measurements of ac signals, such as voltage and electrical current, with fiber Bragg grating (FBG) sensors is presented. This based on twin-grating scheme, in which the measured quantity obtained from optical power convolution between sensing FBG tunable FBG. The proposed interrogator employs low-voltage monolithic multilayer piezoelectric actuator (MMPA) to sweep over wavelength range FBG, order obtain function accurately. A dedicated...

We present in this paper a simple and low-cost Power Line Communication (PLC) modem for Internet of Things (IoT) applications. The proposed implements on-off-keying (OOK) modulation/demodulation with only discrete electronic components, not requiring complex ICs, such as processing units. It uses the ground neutral wires channel communication, eliminating need isolation circuitry. To improve its robustness to noise, developed PLC includes an automatic receiver gain adjustment transmitter...

In this work, we present a comparative study on the influence of geometric shape plastic optical fiber (POF) sensors in their response to refractive index (RI) external media. Three different shapes were simulated using finite-element method (FEM), one being simple U-shaped POF sensor (FU) and other two based same U but with additional small curves fiber, FO1 FO2, respectively, allowing for an increased exposure evanescent field. The results simulations showed that FO2 would allow higher...

Conventional methods for pathogen detection in water rely on time-consuming enrichment steps followed by biochemical identification strategies, which require assay times ranging from 24 hours to a week. However, recent years, significant efforts have been made develop biosensing technologies enabling rapid and close-to-real-time of waterborne pathogens. In previous studies, we developed plastic optical fiber (POF) immunosensor using an optoelectronic configuration consisting U-Shape probe...

A flare system in oil platform is a combustion stack used to burn off excess gases that cannot be processed and have eliminated emergency shutdown avoid the risk of explosion. Gas flow measurement flares still considered challenging because has attend many specific demands, quite different from any other application. For these types measurements, sensor technologies are available; however, they all very expensive, only few ones can demands. The objective this article present rate based on...

In this paper a closed-loop interrogation technique for multi-point temperature measurement using fiber Bragg gratings (FBG) is presented. The uses broadband light source and n tunable FBGs to interrogate an array of sensors placed along the optical fiber. Each center wavelength matched with one FBG sensor in array. directly illuminates array, so that all reflected from enters circuit through circulator spectrum each sensing FBG. Because current generated by photodiode proportional...

In this article, a compact fiber-optic current sensor (FOCS) based on an in-fiber Fabry–Pérot interferometer (FPI) and magnetostrictive transducer is presented. The FPI employed in the proposed FOCS was fabricated with 273- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> Section of capillary fiber spliced between two pieces standard single-mode (SMF). commercial...

In this letter, we present a compact, open-loop fiber-optic current sensor (FOCS) based on fiber Bragg gratings (FBG) and magnetostrictive composites of Terfenol-D (TD) optimized for enhanced sensitivity linearity using small concentrations alloy. Using magnetic field concentration techniques orientation domains the composites, prototype proposed FOCS was built with different doping TD (10%, 20%, 40%) characterized currents 15-700 Arms. The showed linear response up to 450 Arms error ±0.55%,...

Abstract Inductive heating using magnetic nanoparticles is a critical process extensively investigated for cancer treatment. However, the high cost of commercially available equipment hinders its accessibility many research groups. In response, this paper introduces simple electronic circuit with low-cost components, making it easy to construct even non-electronic experts. Operating within 50–200 kHz range, employs parallel inductor-capacitor configuration, providing maximum induction field...

In this paper, the experimental investigation of two simple, cost-effective interrogation techniques based on optical power measurement for fiber Bragg gratings (FBG) sensors are presented. The first technique proposed employs each channel a coarse wavelength division multiplexing (CWDM) demultiplexer as an edge filter to modulate reflected by sensing FBG, allowing array FBG be interrogated simultaneously, sharing same broadband light source (BLS) and system. second technique, single is...

A method to compensate the temperature influence on electrical current sensors based fiber Bragg gratings (FBG) is presented in this paper. The operating principle of employment a second grating measurement system, called fixed filter, order interrogate output signal from sensing grating. Once both have been attached Terfenol-D rods close each other and subjected same variations inside protective cover, separation magnetostrictive strain one related can be obtained.

A technique to eliminate the offset drift in demodulator circuitry of open-loop interferometric fiber optic gyroscopes is presented. This employs a demodulation scheme that uses area negative half-cycles output signal sinusoidally modulated gyroscope obtain angular velocity. We propose an electronic periodically reverses input, allowing for acquisition two samples with same magnitude and opposite polarities. The velocity obtained from subtraction these samples, suppressing offset....

The Brazilian mining disaster, which occurred in 2015 the city of Mariana, released millions tons toxic mud and has caused destruction across a vast area from mountains Minas Gerais to Atlantic Ocean. Preventing such accidents demands real-time, continuous monitoring sensor system capable detecting dangerous soil displacement. In this paper, we present temperature-independent, modular inclinometer based on fiber Bragg grating (FBG) array for detection proposed is topology, each module...

We propose and experimentally demonstrate a modulation technique for closed-loop interferometric fiber optic gyroscopes that improves its scale factor control allows the construction of with optimized angle random walk. The proposed two-level two-period is composed two intercalated periods square wave modulation, one amplitude ϕ rad other 2π-ϕ rad. As in angular velocity obtained from difference consecutive output levels. Modulation depth error mean levels periods. eliminates limitation...

In the current study, a new generation of Hydrogen Sulphide (H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S) gas sensor is developed with aid Refractive Index (RI) and Evanescent Field (EF) principles dominant in Plastic Optical Fiber (POF) technology. A U-bent POF functionalized receiving Pulsed Laser Deposited (PLD) thin film sensitive transition metal oxide such as CuO, SnO2 NiO. The containing coupled to an electro-optical set...

This paper presents a study of magnetostrictive composites for magnetic field sensing with FBG and Terfenol-D. Experimental results show that orientation domains permanent magnets promoted an improved linearity the sensor response. © 2019 The Author(s).