Results 31 to 40 of about 1,583 (160)
Improving the Spatial Resolution of an OFDR Based on Recirculating Frequency Shifter
IEEE Photonics Journal, 2015 We demonstrate a novel method for obtaining high spatial resolution optical frequency domain reflectometry (OFDR) utilizing recirculating frequency shifter for broadening the optical frequency sweeping.
Jiaxiong Li +7 more
doaj +1 more source
APL Photonics, 2020 Standard multimode optical fibers normally support transmission over some 100 modes. Large differences in the propagation constant and the spatial distribution of distinct modes degrade the performance of phase-sensitive optical time-domain reflectometry
K. Markiewicz +8 more
doaj +1 more source
Refractometry through optical frequency-domain reflectometry
Electronics Letters, 1985 A refractometer for liquids, based on optical frequency-domain reflectometry, is described which uses a simple fibre probe with minimal contact area with the test liquid. The sensitivity is much better than in earlier reported fibre refractometers.
Tjhung, T.T. +3 more
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Performance of a solid-state frequency-shifted feedback laser in optical ranging [PDF]
Journal of the European Optical Society-Rapid Publications, 2009 The performance of a frequency-shifted feedback laser (FSFL) using a Nd:YVO4 crystal as gain medium was investigated as light source in high accuracy optical ranging based on optical-frequency domain reflectometry (OFDR).
Ndiaye Cheikh +2 more
doaj +1 more source
Newest Methods and Approaches to Enhance the Performance of Optical Frequency-Domain Reflectometers
SensorsIn this review, we summarize the latest advances in the design of optical frequency-domain reflectometers (OFDRs), digital signal processing, and sensors based on special optical fibers.
Ivan A. Lobach +9 more
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Applied Sciences, 2021 This work is devoted to the study of the pyroelectric effect on the properties of optical waveguides formed in a lithium niobate crystal by proton exchange.
Roman Ponomarev +4 more
doaj +1 more source
Bandwidth-division in digitally enhanced optical frequency domain reflectometry
Optics Express, 2013 We demonstrate for the first time the use of digital range-gating in OFDR to allow for orders of magnitude reduction in the required sampling rates. This allows for sensing over long lengths of fiber with fast sweeps of the optical source frequency, without requiring impractical sampling rates.
Riesen, N., Lam, T.T.-Y., Chow, J.H.
openaire +3 more sources
Status and analysis of multi-factor intelligent perception of hidden disaster in mines based on DOFS
Meitan kexue jishuCoal is the “ballast stone” for China’s energy security, but hidden disaster-causing factors and the “three highs and one low” problems in deep underground environments pose threats to the safe, efficient and green mining of coal mines.
Weipeng SHI +3 more
doaj +1 more source
A Novel Method for Characterization of Distributed Bragg Reflectors in Photonic Integrated Circuits
IEEE Photonics Journal, 2018 We present a novel and accurate method for characterizing the reflection spectra of distributed Bragg reflectors using optical frequency domain reflectometry.
Dan Zhao +3 more
doaj +1 more source
Macromolecular Rapid Communications, EarlyView.This study presents a microscope‐based photothermal platform that integrates structured laser light projection with machine‐learning‐optimized illumination. By employing neural‐network models to predict and generate thermal profiles, the platform achieves precise thermal processing of block copolymer films.
Filip Franciszek Powala +3 more
wiley +1 more source