Results 91 to 100 of about 200 (137)
Directional borehole radar calibration
Journal of Applied Geophysics, 2007 We are developing an innovative low noise borehole radar system that is designed for a single borehole providing 3D imaging capabilities. Harsh and changing operating environments are challenges to the electronic design. Low noise systems are particularly sensitive to operating conditions. After a brief introduction, testing and calibration methods are
O. Borchert, M. Aliman, A. Glasmachers
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Directional borehole radar antenna calibration
2010 IEEE Instrumentation & Measurement Technology Conference Proceedings, 2010 A directional borehole radar system was developed and tested to assess its directional accuracy. The radar probe employs an Adcock dipole array as its receiving antenna. It is well known that the directional accuracy of the radar probe deteriorates significantly with increased antenna eccentricity.
Kibreab Behaimanot +2 more
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Radar measurements with a directional borehole antenna
SEG Technical Program Expanded Abstracts 1989, 1989 SUMMARY A directional borehole antenna has been developed for the RAMAC borehole radar system. Several methods previously used to locate fracture zones in rock are reviewed. In comparison with these methods of analysing radar data the directional antenna makes it possible to obtain the position of a reflector by measuring in a single borehole.
Olle Olsson +4 more
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A High-Resolution, Short-Range, Directional Borehole Radar
14th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2001 The U.S. Geological Survey (USGS) has recently developed a prototype directional borehole radar system designed to complement a commercial system that the USGS has used for several years for fracture mapping in crystalline rock. The new prototype is designed for higher resolution, shorter range operation.
David L. Wright +3 more
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A directional monostatic borehole radar system
2013 7th International Workshop on Advanced Ground Penetrating Radar, 2013 A directional, monostatic borehole radar system was developed to overcome some disadvantages of the existing bistatic system. The challenges of combining transmitter and receiver in a single module are apparent, since one wants both high transmitting power and high receiver sensitivity.
Matthias Boger, Albrecht Glasmachers
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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
Evaluation of an array type directional borehole radar system
Proceedings. 2005 IEEE International Geoscience and Remote Sensing Symposium, 2005. IGARSS '05., 2005 An array type directional borehole radar system employing passive sensors, optical electric field sensors was developed. The system uses a dipole antenna for transmission and four optical electric field sensors for reception. Four sensors are evenly arranged in the circumferential direction to constitute an antenna array.
Takuya Takayama, Motoyuki Sato
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Dnapl Detection Sensitivity Of A High-Resolution Directional Borehole Radar
16th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2003 The U.S. Geological Survey has developed a directional borehole radar system (DBOR) for high-resolution imaging close to borehole wells. We have conducted physical and numerical modeling to assess the ability of this radar to detect and map the location of dense non-aqueous phase liquids (DNAPLs) near a borehole.
Craig W. Moulton, David L. Wright
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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.
S Ebihara
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Borehole Directional Radar System for Subsurface Scanning
Proceedings of SPE Annual Technical Conference and Exhibition, 1989 Abstract This paper summarizes the progress in the development of the Borehole Directional Radar (BDR). The theory for using radar for geological mapping is shown, and the design and characteristics of the antenna are discussed. The results of field tests in rock formations under both dry and wet conditions are presented.
H-T. Chang
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