Results 21 to 30 of about 25,400 (165)

Monitoring in the Physical Channels of Optical Access Networks

Proceedings of the International Conference on Applied Innovations in IT, 2023
This research concerns the issues of monitoring in the physical channels optical access networks. This is relevant because automated diagnostic and monitoring systems in passive optical networks (PONs) are not available at the moment. The authors discuss
Igor Bogachkov, Nicolay Gorlov, Tatiana Monastyrskaya, Natalya Medvedeva   +3 more
doaj   +1 more source

Enhancement of sensing range of Brillouin optical time‐domain reflectometry system up to 150 km with in‐line bi‐directional erbium‐doped fibre amplifications

Electronics Letters, 2021
Brillouin optical time‐domain reflectometry (BOTDR) has the advantage of requiring access to only one end of the sensing fibre, which is an important property for some applications.
Dr Pierre Clement, Dr Renaud Gabet, Dr Vincent Lanticq, Pr Yves Jaouën   +3 more
doaj   +1 more source

Theoretical and Experimental Studies of Micro-Surface Crack Detections Based on BOTDA

Sensors, 2022
Micro-surface crack detection is important for the health monitoring of civil structures. The present literature review shows that micro-surface cracks can be detected by the Brillouin scattering process in optical fibers.
Baolong Yuan, Yu Ying, Maurizio Morgese, Farhad Ansari   +3 more
doaj   +1 more source

Denoising of BOTDR Dynamic Strain Measurement Using Convolutional Neural Networks

Sensors, 2023
The Brillouin optical time domain reflectometry (BOTDR) system measures the distributed strain and temperature information along the optic fibre by detecting the Brillouin gain spectra (BGS) and finding the Brillouin frequency shift profiles.
Bo Li, Ningjun Jiang, Xiaole Han
doaj   +1 more source

Pseudo-Goldstone magnons in the frustrated S=3/2 Heisenberg helimagnet ZnCr2Se4 with a pyrochlore magnetic sublattice [PDF]

, 2017
Low-energy spin excitations in any long-range ordered magnetic system in the absence of magnetocrystalline anisotropy are gapless Goldstone modes emanating from the ordering wave vectors.
Abernathy, D. L., Cameron, A. S., Efremov, D. V., Felea, V., Inosov, D. S., Loidl, A., Mueller, T., Ollivier, J., Onykiienko, Y. A., Piovano, A., Portnichenko, P. Y., Rachel, S., Schneidewind, A., Thomale, R., Tsurkan, V., Tymoshenko, Y. V.   +15 more
core   +6 more sources

Sound velocity mapping from GHz Brillouin oscillations in transparent materials by optical incidence from the side of the sample

Photoacoustics, 2023
Time-domain Brillouin scattering (TDBS) is an all-optical experimental technique for investigating transparent materials based on laser picosecond ultrasonics. Its application ranges from imaging thin-films, polycrystalline materials and biological cells
Motonobu Tomoda, Akira Toda, Osamu Matsuda, Vitalyi E. Gusev, Oliver B. Wright   +4 more
doaj   +1 more source

Brillouin Optical Correlation-Domain Technologies Based on Synthesis of Optical Coherence Function as Fiber Optic Nerve Systems for Structural Health Monitoring

Applied Sciences, 2019
Brillouin optical correlation-domain technologies are reviewed as “fiber optic nerve systems” for the health monitoring of large structures such as buildings, bridges, and aircraft bodies.
Kazuo Hotate
doaj   +1 more source

Fast Feature Extraction Method for Brillouin Scattering Spectrum of OPGW Optical Cable Based on BOTDR

Sensors, 2023
Brillouin optical time domain reflectometry (BOTDR) detects fiber temperature and strain data and represents one of the most critical ways of identifying abnormal conditions such as ice coverage and lightning strikes on optical fiber composite overhead ...
Xiaojuan Chen, Haoyu Yu
doaj   +1 more source

3D characterization of individual grains of coexisting high-pressure H2O ice phases by time-domain Brillouin scattering [PDF]

Journal of Applied Physics, 2021
Time-domain Brillouin scattering (TDBS) uses ultrashort laser pulses to (i) generate coherent acoustic pulses of picoseconds duration in a solid sample and (ii) follow their propagation in order to image material inhomogeneities with the axial resolution that can be deeply sub-optical, to nm-scale, and the lateral one down to the optical diffraction ...
Sathyan Sandeep, Théo Thréard, Elton De Lima Savi, Nikolay Chigarev, Alain Bulou, Vincent Tournat, Andreas Zerr, Vitalyi E. Gusev, Samuel Raetz   +8 more
openaire   +3 more sources

Incoherent Quasielastic Neutron Scattering Study of Molecular dynamics of 4-n-cyano-4'-octylbiphenyl [PDF]

, 2008
We report incoherent quasielastic neutron scattering experiments on the thermotropic liquid crystal 4-n-cyano-4'-octylbiphenyl. The combination of time-of-flight and backscattering data allows analyzing the intermediate scattering function over about ...
Aliev, Aliev, Bandyopadhyay, Bellini, Bellini, Bernhard Frick, Bonsor, Cang, Capar, Claude Ecolivet, Denis Morineau, Dianoux, Dianoux, Dianoux, Dvinskikh, Dvinskikh, Emsley, Frick, Frunza, Guégan, Guégan, Hervet, Hervet, Iannacchione, Jean-Marc Zanotti, Jin, Kuribayashi, Lacaze, Lalanne, Lau, Leadbetter, Leadbetter, Lefort, Leon, Marinelli, Mitra, Miyachi, Mohammed Guendouz, Qian, Ronan Lefort, Régis Guégan, Schoenhals, Schonhals, Sengupta, Vilfan, Volino, Volino, Wuttke, Zorn   +48 more
core   +4 more sources