Results 31 to 40 of about 24,867 (278)
Probing equilibrium glass flow up to exapoise viscosities [PDF]
, 2015 Glasses are out-of-equilibrium systems aging under the crystallization threat. During ordinary glass formation, the atomic diffusion slows down rendering its experimental investigation impractically long, to the extent that a timescale divergence is ...
Cerullo, G. +5 more
core +2 more sources
Time-domain Brillouin scattering for the determination of laser-induced temperature gradients in liquids [PDF]
Review of Scientific Instruments, 2017 We present an optical technique based on ultrafast photoacoustics to determine the local temperature distribution profile in liquid samples in contact with a laser heated optical transducer. This ultrafast pump-probe experiment uses time-domain Brillouin scattering (TDBS) to locally determine the light scattering frequency shift.
Ievgeniia Chaban +6 more
openaire +5 more sources
Combined Radiation and Temperature Effects on Brillouin-Based Optical Fiber Sensors
Photonics, 2023 The combined effects of temperature (from −80 °C to +80 °C) and 100 kV X-ray exposure (up to 108 kGy(SiO2)) on the physical properties of Brillouin scattering and losses in three differently doped silica-based optical fibers, with varying dopant type and
Jérémy Perrot +6 more
doaj +1 more source
Sensors, 2017 A useful method for eliminating the detrimental effect of laser frequency instability on Brillouin signals by employing the self-heterodyne detection of Rayleigh and Brillouin scattering is presented.
Yongqian Li +3 more
doaj +1 more source
Optica, 2020 Guided acoustic wave Brillouin scattering has gained considerable interest in recent years because of its capacity to detect mechanical features of materials surrounding the optical fiber. Nevertheless, distributed measurements using this mechanism are rarely taken because of the impracticality of the method’s forward scattering mechanism.
Chao Pang +6 more
openaire +2 more sources
Brillouin Scattering Spectrum Analysis Based on Auto-Regressive Spectral Estimation
Photonic Sensors, 2018 Auto-regressive (AR) spectral estimation technology is proposed to analyze the Brillouin scattering spectrum in Brillouin optical time-domain refelectometry.
Mengyun Huang +4 more
doaj +1 more source
Time-domain Brillouin imaging of sound velocity and refractive index using automated angle scanning
Photoacoustics, 2023 We present a picosecond optoacoustic technique for mapping both the longitudinal sound velocity v and the refractive index n in solids by automated measurement at multiple probe incidence angles in time-domain Brillouin scattering.
Motonobu Tomoda +4 more
doaj +1 more source
Vibrational spectra in glasses [PDF]
, 2001 The findings of X-ray and neutron scattering experiments on amorphous systems are interpreted within the framework of the theory of Euclidean random matrices. This allows to take into account the topological nature of the disorder, a key ingredient which
Grigera, T. S. +3 more
core +3 more sources
Journal of Applied Physics, 2022 Here, we report time-resolved broadband transient reflectivity measurements performed in a single crystal of SnS2. We made use of time-domain Brillouin scattering and a broadband probe to measure the out-of-plane longitudinal sound velocity, υL=(2950±100)ms–1, in this semiconducting two-dimensional metal dichalcogenide.
Meixin Cheng +4 more
openaire +2 more sources
Probe pulse design in Brillouin optical time‐domain reflectometry
IET Optoelectronics, 2022 Brillouin optical time‐domain reflectometry (BOTDR) is a branch of distributed fibre‐optic sensors, and it can measure the strain and the temperature information, localised by the return time of the probe pulse, along the fibre based on the spontaneous ...
Mupeng Li +5 more
doaj +1 more source