A SSTDR Methodology, Implementations, and Challenges
Sensors, 2021 Sequence time-domain reflectometry (STDR) and spread spectrum time-domain reflectometry (SSTDR) detect, locate, and diagnose faults in live (energized) electrical systems.
Samuel Kingston +7 more
doaj +1 more source
Advances in phase-sensitive optical time-domain reflectometry
Opto-Electronic Advances, 2022 Phase-sensitive optical time-domain reflectometry (Φ-OTDR) has attracted numerous attention due to its superior performance in detecting the weak perturbations along the fiber.
Shuaiqi Liu +5 more
doaj +1 more source
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
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
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
Time-domain Reflectometry (TDR) technique for the estimation of soil permittivity [PDF]
, 2011 Non
Ferraris, S. +7 more
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The Role of Probe Attenuation in the Time-Domain Reflectometry Characterization of Dielectrics [PDF]
, 2010 The influence of the measurement setup on the estimation of dielectric permittivity spectra from time-domain reflectometry (TDR) responses is investigated.
Ferraris, S. +6 more
core +1 more source
Calibrating electromagnetic induction conductivities with time-domain reflectometry measurements [PDF]
Hydrology and Earth System Sciences, 2018 This paper deals with the issue of monitoring the spatial distribution of bulk electrical conductivity, σb, in the soil root zone by using electromagnetic induction (EMI) sensors under different water and salinity conditions.
G. Dragonetti +8 more
doaj +1 more source
Using time domain reflectometry in triaxial testing
, 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
core +2 more sources