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Differential measurements of elliptic flow (v2) for Au+Au and Cu+Cu collisions at sqrt[sNN]=200 GeV are used to test and validate predictions from perfect fluid hydrodynamics for scaling of v2 with eccentricity, system size, and transverse kinetic energy (KE T). For KE T identical with mT-m up to approximately 1 GeV the scaling is compatible with(More)
Distributed fiber sensing possesses the unique ability to measure the distributed profile of an environmental quantity along many tens of kilometers with spatial resolutions in the meter or even centimeter scale. This feature enables distributed sensors to provide a large number of resolved points using a single optical fiber. However, in current systems,(More)
We propose and experimentally demonstrate a method based on Brillouin optical time-domain analysis to measure the longitudinal signal power distribution along phase-sensitive fiber-optical parametric amplifiers (PS-FOPAs). Experimental results show that the amplification of a PS-FOPA could go through different longitudinal profiles and yet finish with the(More)
A random access distributed Brillouin fibre sensor is presented, based on phase modulation using a pseudo-random bit sequence (PRBS) together with time gating. The standard phase-correlation technique is known to show a noise level increasing linearly with the number of measured points due to weak gratings generated randomly along the whole sensing fibre.(More)
A simple analytic formula is derived to extract tiny dispersion fluctuations along highly nonlinear fibers from distributed measurements of parametric gain. A refined BOTDA scheme, suitable to track Kerr processes, enables low noise measurements. 1. Introduction All-optical devices based on nonlinear effects in Highly Nonlinear Fibers (HNLF) are proving to(More)
1172 The inverse electrocardiography problem in the form of potentials consists in reconstructing the potential on the outer surface of the heart from the potential measured on the chest surface [1, 2]. The study of this problem is motivated by the clinical implementation of new treatment methods for cardiac arrhythmia. Algorithms for solving the inverse(More)
The amplitude of the acoustic wave generated during stimulated Brillouin scattering (SBS) is governed by the following equation 1 : ρ(t, z) = jg 1 t ∫ −∞ exp (− t − t ′ 2τ) A p (t ′ , z)A * s (t ′ , z) dt ′ , (S1) where g 1 is the electrostrictive coupling constant, τ is the acoustic phonon lifetime, and A p , A s are the complex amplitudes of(More)
The recent possibility to generate and read dynamic Bragg gratings in optical fibers by the interaction of multiple optical waves through stimulated Brillouin scattering has opened a new field to realize all-optical fiber-based functions. The generation of dynamic Bragg gratings by the interaction of 2 optical waves through stimulated Brillouin scattering(More)