Analysis of a borehole radar in cross-hole mode

Journal Article · Thu Oct 31 23:00:00 EST 1991 · IEEE Transactions on Geoscience and Remote Sensing (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/36.101368· OSTI ID:7103870

Sato, M ^[1]; Thierbach, R ^[2]

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1. Dept. of Resources Engineering, Tohoku Univ., Sendai 980 (JP)
2. Geological Survey of Lower Saxony, Hannover (DE)

In this paper, the authors present a theoretical approach to the cross-hole radar measurements. An approximate analytical form for the current distribution on an antenna in a borehole is derived and the theoretical receiving signal of borehole radar in the crosshole measurement is calculated. Theory is compared in the time-domain with the measured borehole radar signal obtained in a salt deposit. The radiation pattern of a borehole radar excited by the pulse is discussed. The accuracy of tomographic analysis, which is often applied to the cross-hole radar measurements, is strongly governed by this radiation pattern. The authors found that in practice, most borehole radars have a pattern of a {lambda}/2 dipole antenna. However, the authors pointed out that the radiation pattern can be deformed by short pulse excitation, loading by the surrounding media, and coupling to the logging cable.

• OSTI ID: 7103870
• Journal Information: IEEE Transactions on Geoscience and Remote Sensing (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Geoscience and Remote Sensing (Institute of Electrical and Electronics Engineers); (United States) Vol. 29:6; ISSN 0196-2892; ISSN IGRSD
• Country of Publication: United States
• Language: English

Related Subjects

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47 OTHER INSTRUMENTATION
99 GENERAL AND MISCELLANEOUS
990300 -- Information Handling
ACCURACY
ANTENNAS
BOREHOLES
CAVITIES
DATA PROCESSING
DIAGNOSTIC TECHNIQUES
ELECTRICAL EQUIPMENT
ENGINEERING
EQUIPMENT
GEOLOGIC DEPOSITS
MEASURING INSTRUMENTS
PROCESSING
PULSE TECHNIQUES
RADAR
RANGE FINDERS
REMOTE SENSING
RESERVOIR ENGINEERING
SALT DEPOSITS
TOMOGRAPHY
WELL LOGGING