Results 21 to 30 of about 15,067 (255)
Polymer PCF Bragg grating sensors based on poly(methyl methacrylate) and TOPAS cyclic olefin copolymer [PDF]
, 2011 Fibre Bragg grating (FBG) sensors have been fabricated in polymer photonic crystal fibre (PCF). Results are presented using two different types of polymer optical fibre (POF); first multimode PCF with a core diameter of 50µm based on poly(methyl ...
Bang, Ole +7 more
core +2 more sources
Nonlinear switching in fibre Bragg gratings
Optics Express, 1998 We report on our recent experiments on nonlinear switching in fibre Bragg gratings. Using an all-fibre source we show an increase in transmission of a FBG from 4% to 40% at high powers. This switching is associated with the formation of gap solitons inside the grating.
Broderick, N.G.R. +2 more
openaire +3 more sources
Design of a new method for detection of occupancy in the smart home using an FBG sensor [PDF]
, 2020 This article introduces a new way of using a fibre Bragg grating (FBG) sensor for detecting the presence and number of occupants in the monitored space in a smart home (SH).
Fajkus, Marcel +3 more
core +1 more source
Measurement + Control, 2001 Fibre optic sensing devices have been produced for the dual measurement of strain and temperature using the combined properties of fibre Bragg gratings and the fluorescence lifetime of erbium-doped fibre.
S.A. Wade +7 more
doaj +1 more source
Locally Pressed Fibre Bragg Grating Pressure Sensor [PDF]
Optical Fiber Sensors, 2006 A spectral-hole created by locally pressing a fibre Bragg grating exhibited a wavelength-shift within the FBG bandwidth. A sensitivity of 74.3pm/(N/mm) was obtained for pressure applied along the slow axis of a high birefringence fibre.
Correia, Ricardo N. +3 more
openaire +2 more sources
Advances in fibre optic based geotechnical monitoring systems for underground excavations
International Journal of Mining Science and Technology, 2019 Geotechnical stability is a major concern for the long-term safety and integrity of underground infrastructures such as tunnels, railway stations, mine shafts and hydraulic power chambers.
Hongkui Gong +5 more
doaj +1 more source
Journal of the European Optical Society-Rapid Publications, 2009 Strong regenerated gratings with a maximum grating strength exceeding (40–50) dB are fabricated inside an optical fibre by bulk macro thermal processing ∼ 900°C using a UV-laser seeded Bragg grating. Further annealing between 1000°C and 1100°C leads to a
Canning John +5 more
doaj +1 more source
Identifying fabrication defects of metal packaged fibre Bragg grating sensors for smart pre-stressing strands [PDF]
, 2015 Metal packaged fibre Bragg grating sensors have the potential to provide reliable measurements of temperature and strain in high stress environments for the purpose of structural health monitoring. However due to the induction brazing fabrication process
Johnston, M., McKeeman, I., Niewczas, P.
core +1 more source
International Journal of Distributed Sensor Networks, 2018 Tunnels and subway blast doors are effective barriers to terrorist attacks and emergencies, and research into the mechanical properties of blast doors under explosive dynamic loads can improve and enhance the performance thereof. In this article, surface
Ziming Xiong +6 more
doaj +1 more source
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 +3 more
doaj +1 more source