Results 61 to 70 of about 2,469 (206)

Experimental characterization of Rayleigh backscattering in few-mode fiber using all-fiber photonic lanterns

, 2015
We experimentally characterize the characteristics of Rayleigh backscattering arising in few-mode fiber (FMF) using a mode selective all-fiber photonic lantern whose mode transfer matrix is measured through an easy implementation of back-reflection ...
Ton Koonen, Chigo Okonkwo, Fu, S Songnian, Okonkwo, Chigo; id_orcid, Okonkwo, Chigo, Shum, Perry, Tang, Ming, Perry Shum, Deming Liu, Van Weerdenburg, John, Cao, Zizheng, Ian Giles, Giles, Ian, Cao, Z Zizheng, van Weerdenburg, JJA John, Ming Tang, Okonkwo, CM Chigo, Dawei Yu, Yu, Dawei, Liu, D Deming, Fu, Songnian, Liu, Deming, Songnian Fu, Zizheng Cao, Tang, M Ming, Koonen, AMJ Ton, Yu, D Dawei, John van Weerdenburg, Koonen, Ton   +28 more
core   +1 more source

Ionizing radiation profiling through the induced refractive index change in backscattering-enhanced optical fibers [PDF]

, 2022
Enhanced Rayleigh backscattering optical fibers, interrogated by an optical frequency domain reflectometer, are used to perform remote real-time measurements of X-ray irradiation profiles, with possible application as dosimeters in radiotherapy ...
Martha Segura, Massimo Olivero, Wilfried Blanc, Daniele Tosi, Guido Perrone, Mourad Benabdesselam, Aurora Bellone, Franck Mady   +7 more
core   +1 more source

Distributed temperature-change sensor based on Rayleigh backscattering in an optical fiber [PDF]

Optics Letters, 1994
A frequency-modulated continuous-wave technique is used to detect the presence of frequency shifts in the Rayleigh-backscattered light in a single-mode optical fiber as a result of a changing temperature. The system is able to detect a rate of temperature change of 0.014 K/s, when a 20-cm length of fiber is heated.
Rathod, R., Pechstedt, R.D., Jackson, David A., Webb, David J.   +3 more
openaire   +2 more sources

External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range

Sensors, 2021
Optical coherent domain reflectometry (OCDR) can achieve a high spatial resolution that is independent of the bandwidth of the receiver, but the measurement range is usually very limited.
Yinghong Xue, Yueping Niu, Shangqing Gong   +2 more
doaj   +1 more source

Transmission Raman Spectroscopy (TRS) for Accurate Authentication of API in Coated Hydroxychloroquine (HCQ) Tablets

Journal of Raman Spectroscopy, EarlyView.
We report the development and use of a transmission Raman spectroscopy (TRS) system for a more accurate but nonintrusive way of authentication of API in coated HCQ tablets which otherwise is not possible using the backscattered (BS) configuration of Raman spectroscopy. The coating interference is found to be almost zero in case of the TRS and a greater
Vijay Kumar, Khan Mohammad Khan, Hemant Krishna, Khageswar Sahu, Srinibas Satapathy, Shovan Kumar Majumder   +5 more
wiley   +1 more source

Impact of Rayleigh backscattering on stimulated Brillouin scattering threshold evaluation for 10Gb/s NRZ-OOK signals

, 2008
We experimentally verified a decrease of Stimulated Brillouin Scattering threshold for 10Gb/s NRZ-OOK signals with respect to theoretical predictions. We relate this reduction to Rayleigh Backscattering interaction with Stokes backscattered spectrum. BER
Mario Martinelli, BOFFI, PIERPAOLO, MARAZZI, LUCIA, RIGHETTI, ALDO, M. Ferrario, Aldo Righetti, Lucia Marazzi, FERRARIO, MADDALENA, MARTINELLI, MARIO, Pierpaolo Boffi   +9 more
core   +1 more source

Embedding Fiber Segment Interferometry for Localization of Defects in Composite Structures

Polymer Composites, EarlyView.
Graphical representation of composite structures with embedded fiber optic sensors for structural health monitoring, enabling strain measurement and damage localization under mechanical loading. ABSTRACT In the area of structural health monitoring (SHM), embedding strain sensors into smart composites is a key strategy for detecting failures arising ...
Shiva Mohammadkarimi, Christoph Hemeling, Thomas Kissinger, Florian Puch   +3 more
wiley   +1 more source

Exploiting Aeolus winds in a regional numerical weather prediction model

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Aeolus measured winds have proven to be beneficial for global models. However, demonstrating positive impact for limited‐area models has been a challenge so far. For the first time, we have demonstrated a statistically significant positive impact of Aeolus winds in a limited‐area model by using the 4DVar data assimilation technique and the most recent ...
Gert‐Jan Marseille, Roohollah Azad, Martin Ridal, Susanna Hagelin   +3 more
wiley   +1 more source

Performance limits of erbium-doped fibre amplifiers due to internal Rayleigh backscattering

, 1993
For gains above ~30dB internal Rayleigh backscattering deteriorates both amplifier gain and noise figure. In high gain applications, increasing the fibre NA and dopant confinement above a critical value is shown to be ...
Laming, R.I., Michael N. Zervas, Richard I. Laming, Zervas, M.N.   +3 more
core   +1 more source

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, EarlyView.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source