Results 71 to 80 of about 145 (123)
ELBARA II, an L-band radiometer system for soil moisture research. [PDF]
Sensors (Basel), 2010 Schwank M +7 more
europepmc +1 more source
Previously hidden landslide processes revealed using distributed acoustic sensing with nanostrain-rate sensitivity. [PDF]
Nat CommunOuellet SM +8 more
europepmc +1 more source
Early Warning Systems A State of the Art Analysis and Future Directions. [PDF]
Environ Dev, 2012 europepmc +1 more source
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Singlehole borehole radar measurement with a thin directional borehole radar sonde
2013 7th International Workshop on Advanced Ground Penetrating Radar, 2013This study demonstrates 3-D imaging of a fault using a thin (5.4 cm diameter) directional borehole radar sonde. In order to make the thin sonde, we needed to reduce interference between the centered conducting cylinder (CCC) and the antenna elements in the coaxial-fed circular dipole array in a borehole (CFCAB). Ferrite beads were loaded in the CCC for
exaly +3 more sources
A Novel Direction-Finding Algorithm for Directional Borehole Radar
IEEE Transactions on Geoscience and Remote Sensing, 2007A directional borehole radar system has been developed for the purpose of 3-D imaging of subsurface targets in a single-hole measurement. The radar system is equipped with a uniform circular array consisting of four dipole antennas as a receiver in order to realize azimuth bearing sensitivity.
Motoyuki Sato
exaly +2 more sources
Super-resolution of coherent targets by a directional borehole radar
IEEE Transactions on Geoscience and Remote Sensing, 2000An analytical method based on the multiple signal classification (MUSIC) algorithm is applied to three-dimensional (3D) estimation of target positions using a directional borehole radar. A cylindrical conformal array on a conducting cylinder in a borehole was used for experimental measurements estimating the position of targets.
Satoshi Ebihara +2 more
exaly +2 more sources
A Compact Ferrite-Based Dipole Directional Antenna for Borehole Radar Application
IEEE Geoscience and Remote Sensing Letters, 2013A compact ferrite-based directional antenna has been designed to serve in a directional borehole radar system with a center frequency at 100 MHz and a bandwidth from 70 to 180 MHz. The parameters of the antenna are with a 6:1 power front-to-back ratio and a ±60° directional diagram at half peak amplitude, and the tailing duration of the receiving pulse
Hong-Chun Yang
exaly +2 more sources
Analysis of Directional Borehole Radar Measurement Data
2007 4th International Workshop on, Advanced Ground Penetrating Radar, 2007We developed a new directional borehole radar system with an array of optical electric field sensors as receivers. The system was tested in a field test site in order to assert its ability to detect three dimensional (3D) location of a subsurface tunnel.
T. Takayama, M. Sato, J. H. Kim
exaly +2 more sources
A Cylindrical Conformal Directional Monopole Antenna for Borehole Radar Application
IEEE Antennas and Wireless Propagation Letters, 2012A compact lumped loading cylindrical conformal directional monopole antenna with 68 mm diameter and 185 mm height has been designed to serve in a directional borehole radar system. The antenna is employed for radiating Gaussian monocycle pulse with peak-peak width of 1.5 ns.
Hong-Chun Yang
exaly +2 more sources
A decade of directional borehole radar services: From past to future
2012 14th International Conference on Ground Penetrating Radar (GPR), 2012While conventional GPR investigations are carried out on the surface/ 2D plane, delivering 2D information, Borehole Radar is applied in a 3D space. A borehole radar system for a total 3D space investigation has to distinguish between the directions around the tool axis to allow a 3D interpretation of the data. During the past decade a powerful tool was
K. Siever +3 more
exaly +2 more sources