Escherichia coli (E. coli) is a large and diverse bacteria group that inhabits the intestinal tract of many mammals. Most E. strains are harmless, however some them pathogenic, meaning they can make one sick if ingested. By being in feces animals humans, its presence water food used as indicator fecal contamination. The main method for this microorganism detection bacterial culture medium time-consuming requires laboratory with specialized personnel. Other sophisticated methods still not...

Electric power facilities, such as substations, rely on voltage transformers (VTs) for measurement and protection. These pieces of equipment are bulky heavy tend to explode, destroying nearby posing a threat substation personnel. Optical transducers offer many improvements traditional inductive capacitive VTs, linear performance, wider dynamic range, lighter weight, smaller size, improved safety. This paper relates the development high-voltage sensor system using PZT piezoelectric crystal...

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,...

An optoelectronic sensor for real-time leakage current monitoring on high-voltage (500 kV) and medium-voltage (13.8 power line insulators was developed. The drives an ultrabright light-emitting diode producing amplitude modulated light signal. optically intensity-encoded signal is coupled to a plastic optical fiber cable transmitted from the high potential measurement point remote unit in ground potential. After demodulation, root mean square values are concentrated data logger sent station...

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...

Most of the dam's disasters that occurred in world could be avoided if proper and preventive measures were taken, such as long-term surface or underground monitoring to detect small soil displacements. However, due complex operation necessary monitor layer displacements, inclinometers are not used with suitable regularity. To circumvent logistics field campaigns conventional inclinometers, a real-time, remote system was developed. In this paper, fiberoptic inclinometer designed, consisting...

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...

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...

Conventional pathogen detection methods require trained personnel, specialized laboratories and can take days to provide a result. Thus, portable biosensors with rapid response are vital for the current needs in-loco quality assays. In this work authors analyze characteristics of an immunosensor based on evanescent field in plastic optical fibers macro curvature by comparing experimental simulated results. The studies different shapes evanescent-wave fiber optic sensors, adopting...

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...

There have been many applications of fibre Bragg grating (FBG) in temperature measurements; however, there are no studies concerned with their application, uncertainty and repeatability as sensor the electric power industry. This study describes research, construction, calibration operation an FBG‐based system performing a continuous monitoring inside fully operational connected‐to‐the‐grid hydroelectric generator. The FBGs were calibrated for quantification parameters such uncertainty,...

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%,...

This paper describes, for the first time to our knowledge, a fast-response and specific biosensor detection of Taenia solium, parasite responsible neurocysticercosis disease that affects central nervous system. The is based on localized surface plasmon resonance (LSPR) technique gold nanoparticles (AuNPs) in colloidal suspension were functionalized activated with antibodies perform an immuno-capture effect. AuNPs synthetized by Turkevich seed-mediated growth methods. A variety concentrations...

This work presents a theoretical-experimental study of refractive index (RI) sensor based on lossy mode resonances (LMR) generated with side-polished low-index polymer optical fiber. The theoretical part involves conducting simulations to determine the optimal coating thickness for achieving first (1 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">st</sup> ) and second (2 xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> LMR, as well their...

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...