Results 11 to 20 of about 10,558 (240)

CYTOP Fibre Bragg Grating Sensors for Harsh Radiation Environments

Sensors, 2019
We present a polymer fibre Bragg grating sensor and its sensitivity to gamma radiation by observing the reflected spectral profile. The Bragg grating is femtosecond inscribed within a perfluorinated CYTOP fibre and the alteration of the Bragg wavelength ...
Christian Broadway, Damien Kinet, Antreas Theodosiou, Kyriacos Kalli, Andrei Gusarov, Christophe Caucheteur, Patrice Mégret   +6 more
doaj   +3 more sources

Extreme Silica Optical Fibre Gratings

Sensors, 2008
A regenerated optical fibre Bragg grating that survives temperature cycling up to 1,295°C is demonstrated. A model based on seeded crystallisation or amorphisation is proposed.
Kevin Cook, Somnath Bandyopadhyay, Michael Stevenson, John Canning   +3 more
doaj   +3 more sources

The Proper Use of Fibre-Optic Sensors to Monitor the Condition of the Steam Boiler Hanger Rods [PDF]

Sensors, 2023
Fibre optic sensors with integrated Bragg gratings are widely used in the diagnostics of machinery and equipment. They achieved their popularity thanks to their relatively simple operating principles.
Magdalena Palacz, Bolesław Bąk, Łukasz Felkowski, Piotr Duda, Iliya Iliev   +4 more
doaj   +2 more sources

Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain [PDF]

Sensors, 2022
Polymer optical fibre Bragg grating (POFBG) sensors are of high interest due to their enhanced fracture toughness, flexibility in bending, and sensitivity in stress and pressure monitoring applications compared to silica-based sensors.
Andreas Pospori, Andreas Ioannou, Kyriacos Kalli   +2 more
doaj   +2 more sources

Inscription methods for co‐located fibre Bragg gratings using small spot direct UV writing

Electronics Letters, 2021
Two methods to inscribe co‐located fibre Bragg gratings using the small spot direct UV writing technique are described and compared, namely: superimposed gratings, which are written one over the other at the same spatial location, and superstructured ...
S. L. Jantzen, D. H. Smith, R. H. S. Bannerman, L. J. Boyd, J. C. Gates, P. G. R. Smith, C. Holmes   +6 more
doaj   +1 more source

Laser nano-filament explosion for enabling open-grating sensing in optical fibre

Nature Communications, 2021
Engineered stop bands to sense an ambient environment can enable many applications. Here, the authors demonstrate well-controlled processes to open high-aspect ratio nanoholes through optical fibre for Bragg gratings in the telecomm spectrum and to ...
Keivan Mahmoud Aghdami, Abdullah Rahnama, Erden Ertorer, Peter R. Herman   +3 more
doaj   +1 more source

Analysis of the inadequacy of determining the spectral characteristics of optical fibre periodic structures by way of numerical modelling

Metrology and Measurement Systems, 2020
As part of the work, the error level of simulations of uniform optical-fibre Bragg gratings was determined using the transitionmatrixmethod. The errorswere established by comparing the transmission characteristics of the structures obtained by simulation
Stępniak Piotr, Kisała Piotr
doaj   +1 more source

High-temperature type IIa gratings in 12-ring photonic crystal fibre with germanosilicate core [PDF]

Journal of the European Optical Society-Rapid Publications, 2008
The inscription of efficient Bragg gratings (> 20 dB) in 12-ring photonic crystal fibre with a germanosilicate doped core without the need for hydrogen loading using 193 nm is demonstrated.
Cook K., Pohl A.A.P., Canning J.
doaj   +1 more source

Comparative Study of γ- and e-Radiation-Induced Effects on FBGs Using Different Femtosecond Laser Inscription Methods

Sensors, 2021
This work presents an extensive, comparative study of the gamma and electron radiation effects on the behaviour of femtosecond laser-inscribed fibre Bragg gratings (FBGs) using the point-by-point and plane-by-plane inscription methods.
Antreas Theodosiou, Arnaldo Leal-Junior, Carlos Marques, Anselmo Frizera, Antonio J. S. Fernandes, Andrei Stancalie, Andreas Ioannou, Daniel Ighigeanu, Razvan Mihalcea, Constantin Daniel Negut, Kyriacos Kalli   +10 more
doaj   +1 more source

3D printed FBG based sensor for vital signal monitoring – Influence of the infill printing parameters [PDF]

EPJ Web of Conferences, 2022
The fused deposition modelling technique has been used in the production of strain sensors in which fibre Bragg gratings (FBGs) are encapsulated during the 3D printing process.
Ferreira Alexandra, Tavares Cátia, Leitão Cátia, Lo Presti Daniela, Domingues M. Fátima, Alberto Nélia, da Silva Hugo Plácido, Antunes Paulo   +7 more
doaj   +1 more source