A novel fiber optic distributed temperature and strain sensor for building applications

AbstractA novel fiber optic distributed sensor for temperature and strain measurements in building constructions has been developed and studied which is a composite optical element in the form of a reinforced single-mode optical fiber placed directly in the body of a fiberglass armature. The sensor has a reasonably high sensitivity to changes in external temperature and strain and a good spatial resolution. Besides, it is characterized by a high mechanical strength as compared to conventional fiber sensor elements. The experimental results obtained on a prototype show the value of the temperature sensitivity of 0.1MHz/deg and the sensitivity to strain of 2.7MHz/mm

Simulating a scintillation fiber detector of the activities of ionizing radiation sources

Computer simulation results are presented for a fiber sensor based on the Saint-Gobain Crystals BSF-60 scintillation fiber aimed to measure the activities of sources of ionizing radiation. The simulation based on the Monte Carlo method and a Geant4 software code was applied to calculate the dependence of the number of beta-electrons entering a BSF-60 scintillation fiber on the activity of radiation sources based on 89Sr and 90Sr isotopes. An experimental study of the sensitivity of the developed fiber sensor and the measuring system to beta radiation of 89Sr and 90Sr isotopes showed a high degree of compliance with the proposed model. Keywords: Modeling, Computer simulation, Scintillation fiber, Dosimeter, Geant

Управляемый электрическим напряжением химический датчик на основе эффекта Гуса-Хенхен в электорооптической фотонной структуре

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Resonant amplification of slow surface plasmon polaritons in a DC current pumped semiconductor/graphene waveguide with a groove defect

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Controlling optical beam shifts upon reflection from a magnetoelectric liquid-crystal-based system for applications to chemical vapor sensing

International audienceWe investigate the tunability of the Goos–Hänchen shift experienced by a Gaussian light beam reflected from a multilayered heterostructure consisting of a nematic liquid-crystal cell sandwiched between electrodes and deposited on a magneto-electric/non-magnetic bilayer. Our calculations account for the optical anisotropy of the magnetic layer and of the liquid-crystal cell, as well as for the inhomogeneous refractive index distribution in the latter due to the reorientation of its molecules. We show that the Goos–Hänchen shift can be enhanced and controlled via the voltage applied to the liquid crystal cell and the magnetization direction of the magnetic film. We propose to exploit the voltage-induced tunability of the Goos–Hänchen shift in this system to design an optical sensor devoted to the detection of chemical vapors in the vicinity of the structure

Voltage-tunable vapour detector using optical beam shifts in magneto-electric multilayered structure

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Exploiting the Goos-Hänchen and Imbert-Fedorov effects in a magneto-electric liquid-crystal-based system for applications to tunable chemical vapor detection

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Application of phosphate doped fibers for OFDR dosimetry

We employ phosphate doped optical fibers for distributed dosimetry based on Optical Frequency Domain Reflectometry (OFDR) and demonstrate the effect of limited Integrated Insertion Loss Dynamic Range (ILDR) on the system performance. Keywords: OFDR sensing, Optical fiber dosimetry, Phosphate doped fiber