Using time domain reflectometry in triaxial testing [PDF]
, 2000 : Time domain reflectometry (TDR) can be used to determine the volumetric water content of soils. This note describes the utilization of a TDR miniprobe in triaxial testing. The TDR performance was examined with a series of tests that not only proved its
Lefebvre, M. E. +3 more
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Synthetic spectrum approach for Brillouin optical time-domain reflectometry. [PDF]
Sensors (Basel), 2014 We propose a novel method to improve the spatial resolution of Brillouin optical time-domain reflectometry (BOTDR), referred to as synthetic BOTDR (S-BOTDR), and experimentally verify the resolution improvements.
Nishiguchi K, Li CH, Guzik A, Kishida K.
europepmc +2 more sources
Characterisation of sedimentary structure and hydraulic behaviour within the unsaturated zone of the Triassic Sherwood Sandstone aquifer in North East England [PDF]
, 2004 A study of the sedimentological framework and permeability characteristics of the Sherwood Sandstone has been undertaken together with a detailed investigation of moisture migration in the vadose zone at a single field site.
Truss, Steven William
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Recent Advances in Phase-Sensitive Optical Time Domain Reflectometry (Ф-OTDR)
Photonic Sensors, 2021 Phase-sensitive optical time domain reflectometry (Ф-OTDR) is an effective way to detect vibrations and acoustic waves with high sensitivity, by interrogating coherent Rayleigh backscattering light in sensing fiber. In particular, fiber-optic distributed
Yunjiang Rao +4 more
doaj +1 more source
Coherent-Phase Optical Time Domain Reflectometry for Monitoring High-Temperature Superconducting Magnet Systems. [PDF]
Sensors (Basel)High-temperature superconductor (HTS) magnet systems, especially those designed for fusion reactors, require effective and reliable monitoring to avoid damaging anomalies.
Leoschke M +5 more
europepmc +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
Combined Punctual and Diffused Monitoring of Concrete Structures Based on Dielectric Measurements
Sensors, 2021 This work presents a microwave reflectometry-based system for monitoring large concrete structures (during the curing process and also while the structure is in use), through the combined use of punctual and diffused sensing elements.
Andrea Cataldo +5 more
doaj +1 more source
Multiplexing a serial array of tapered optical fibre sensors using coherent optical frequency domain reflectometry [PDF]
, 2012 The use of high spatial resolution optical frequency domain reflectometry (OFDR) to facilitate the multiplexing of a serial array of tapered optical fibre sensors is presented.
Tatam, Ralph P. +3 more
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Phase-Sensitive Optical Time Domain Reflectometry With Rayleigh Enhanced Optical Fiber
IEEE Access, 2021 In this paper, a phase-sensitive optical time domain reflectometry ( $\Phi $ -OTDR) based on Rayleigh enhanced optical fiber is proposed to improve the system signal-to-noise ratio (SNR).
Nageswara Lalam +4 more
doaj +1 more source
Phase-sensitive optical time-domain reflectometry: concept and applications
, 2022 We provide an overview of the basic concepts, state of the art performances and applications of phase-sensitive optical time-domain reflectometry.10.13039/501100004837-Spanish Ministry of Science and Innovation (Grant Number: PLEC2021-007875,MCIN/AEI/10 ...
Fernández-Ruiz, María R. +3 more
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