Results 21 to 30 of about 15,168 (244)

Simultaneous Vector Bend and Temperature Sensing Based on a Polymer and Silica Optical Fibre Grating Pair

Sensors, 2018
The bending response of polymer optical fibre Bragg grating (POFBG) and silica optical fibre Bragg grating (SOFBG) mounted on a brass beam have been systematically studied and compared.
Binbin Yan, Guoqiang Liu, Jun He, Yanhua Luo, Liwei Yang, Haifeng Qi, Xinzhu Sang, Kuiru Wang, Chongxiu Yu, Jinhui Yuan, Gang-Ding Peng   +10 more
doaj   +1 more source

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., Taverner, D., Richardson, D.J.   +2 more
openaire   +3 more sources

Dual Measurement of Strain and Temperature Using the Combination of Er -Doped Fibre Fluorescence Lifetime and a Fibre Bragg Grating

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, D.I. Forsyth, Q. Guofu, X. Chen, T. S. Chuan, W. Yong, T. Sun, K T V Grattan   +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., Chehura, Edmon, James, Stephen W., Tatam, Ralph P.   +3 more
openaire   +2 more sources

A simple method for fabricating phase-shifted fibre Bragg gratings with flexible choice of centre wavelength [PDF]

, 2009
A simple technique for fabricating phase-shifted fibre Bragg gratings (PSFBGs) without the use of a phase-shifted phase mask is presented. Two, 3-mm long, standard fibre Bragg gratings (FBGs) were inscribed sequentially in singlemode fibre at the same
Chehura, Edmon, James, Stephen W., Tatam, Ralph P.   +2 more
core   +1 more source

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, Mehmet S. Kizil, Zhongwei Chen, Moe Amanzadeh, Ben Yang, Saiied M. Aminossadati   +5 more
doaj   +1 more source

Regenerated gratings [PDF]

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, Bandyopadhyay Somnath, Stevenson Michael, Biswas Palas, Fenton Jacob, Aslund Mattias   +5 more
doaj   +1 more source

Evaluation and identification of dynamic strain on a blast door subjected to blast loading using fibre Bragg grating sensors

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, Qinghua Zhang, Hao Lu, Shaoshuai Shi, Zewei You, Yuanpu Xia, Lin Bu   +6 more
doaj   +1 more source

Photonic integrated circuits for terahertz source generation

IET Optoelectronics, 2020
The authors introduce four kinds of terahertz photonics components based on photonic integrated circuits (PICs). A PIC‐based integrated optoelectronic synthesiser for THz communications is described, which can be tuned continuously over the range 0.254–2.
Lianping Hou, Song Tang, Bin Hou, John H. Marsh   +3 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, Somnath Bandyopadhyay, Michael Stevenson, John Canning   +3 more
doaj   +1 more source