Results 111 to 120 of about 200 (137)
A decade of directional borehole radar services: From past to future
2012 14th International Conference on Ground Penetrating Radar (GPR), 2012 While 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
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Linear Prediction-Based DOA Estimation for Directional Borehole Radar 3-D Imaging
IEEE Transactions on Geoscience and Remote Sensing, 2019Directional borehole radar (BR) 3-D imaging is a challenging problem due to its limited observation space within a borehole. We present a linear prediction (LP)-based direction-of-arrival (DOA) estimation and a migration-based 3-D imaging algorithm for the directional BR, which is composed of a transmitting antenna and a uniform circular array ...
Sixin Liu, Qi Lu
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High range resolution directional borehole radar for 3-D fracture delineation
2009 IEEE International Geoscience and Remote Sensing Symposium, 2009 Directional borehole radar was developed for detection of three-dimensional (3-D) target localization in single-hole radar measurement. Phase differences among four dipole elements of receiving circular array uniquely determine an azimuth direction of a reflected wave. Receiving voltages of dipole elements are measured by optical electric field sensors
Motoyuki Sato, Takuya Takayama
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The detection of cracks in blast-holes using directional borehole radar
2016 16th International Conference on Ground Penetrating Radar (GPR), 2016 The detection of subsurface cracks and moisture in blast-holes is an important problem to be solved in open-cut coal mining. During the overburden removal process at open-cut coal mines, blast-holes are drilled and filled with ANFO explosive. Any explosive that extends into surrounding cracks within the blast-hole has the potential to remain unexploded
A. D. Strange, Z. Jecny
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18th International Conference on Ground Penetrating Radar, Golden, Colorado, 14–19 June 2020, 2020 Satoshi Ebihara +5 more
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A shielded loop array antenna for a directional borehole radar
Fourth International Conference on Ground Penetrating Radar, 1992 Motoyuki Sato, Tatsuya Tanimoto
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A directional borehole radar system for subsurface imaging
, 2002 Electrical Engineering, Mathematics and Computer ...
Van Dongen, K.W.A. +1 more
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A Directional Borehole Radar System
Subsurface Sensing Technologies and Applications, 2002In this paper we present the simulation and design of a directional borehole radar. In addition we discuss an imaging method for the radar system. The antenna system contains an electric dipole which is in one direction shielded by a cylindrical perfectly conducting reflector.
Koen W.A. van Dongen +4 more
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Field test of directional borehole radar in a hydrocarbon production well
Proceedings of the 15th International Conference on Ground Penetrating Radar, 2014 null Chunguang Ma +4 more
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Small directional borehole radar antennas; numerical modelling method
10th SAGA Biennial Technical Meeting and Exhibition, 2007 T. Nyareli
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