Polymer tensiometers with ceramic cones: direct observations of matric pressures in drying soils [PDF]
Hydrology and Earth System Sciences, 2010 Measuring soil water potentials is crucial to characterize vadose zone processes. Conventional tensiometers only measure until approximately −0.09 MPa, and indirect methods may suffer from the non-uniqueness in the relationship between matric potential ...
M. J. van der Ploeg +7 more
doaj +3 more sources
Characterizing Scalar Metasurfaces Using Time-Domain Reflectometry
IEEE Access, 2022 Two efficient methodologies for the determination of electromagnetic (EM) constitutive properties of scalar metasurfaces are introduced and discussed. In contrast to the available methods, and in line with the recent increasing interest in time-domain ...
Tomas Dolezal +2 more
doaj +2 more sources
Time-expanded phase-sensitive optical time-domain reflectometry. [PDF]
Light Sci Appl, 2021 Phase-sensitive optical time-domain reflectometry (ΦOTDR) is a well-established technique that provides spatio-temporal measurements of an environmental variable in real time.
Soriano-Amat M +6 more
europepmc +2 more sources
Enumeration of Bacteria in Suspensions Using Time Domain Reflectometry. [PDF]
ACS Meas Sci AuHu H, Lu Y, Horton R, Ren T.
europepmc +2 more sources
Recent Advances in Brillouin Optical Time Domain Reflectometry. [PDF]
Sensors (Basel), 2019 In the past two decades Brillouin-based sensors have emerged as a newly-developed optical fiber sensing technology for distributed temperature and strain measurements.
Bai Q +7 more
europepmc +2 more sources
Single-photon detector-based long-distance Brillouin optical time domain reflectometry [PDF]
EPJ Web of Conferences, 2023 We present a long-range Brillouin optical time domain reflectometer (BOTDR) based on photon counting technology. We demonstrate experimentally the ability to perform a distributed temperature measurement, by detecting a hot spot in a thermal bath at 100 ...
Romanet Maxime +3 more
doaj +1 more source
Hydraulic Conductivity of Saturated Soil Medium through Time-Domain Reflectometry. [PDF]
Sensors (Basel), 2020 Time-domain reflectometry (TDR) has been extensively used to study soil behaviors. The objective of this study is to propose a method for measuring hydraulic conductivity using TDR. The dielectric constant deduced from TDR is influenced by the electrical
Lee S, Yoon HK.
europepmc +2 more sources
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
Analysis of Phase-Shift Pulse Brillouin Optical Time-Domain Reflectometry. [PDF]
Sensors (Basel), 2019 Distributed strain and temperature can be measured by using local Brillouin backscatter in optical fibers based on the strain and temperature dependence of the Brillouin frequency shift.
Horiguchi T, Masui Y, Zan MSD.
europepmc +2 more sources
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