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Proceedings Paper

Borehole radar imaging in three dimensions
Author(s): N. Osman; I. M. Mason; G. Turner; E. Wedepohl
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Paper Abstract

Broadband VHF borehole radars can be used by miners as tactical tools to map orebodies, faults and other marker horizons; to identify hazards well in advance of mining and to stop unnecessary mine development or underdevelopment. In principle, fan scans and crosshole profiles of borehole pairs and triplets can be used to synthesize three-dimensional images interferometrically if their trajectories are accurately known, signal-to-noise ratios are adequate, the spatial sampling rate is sufficient and if the target space is sufficiently uncluttered to limit the formation of mirages during reconstruction. However automatic methods of projecting data into 3D image space make stringent demands upon rock homogeneity, translucence and the accuracy of borehole trajectories. These demands can be relaxed by kinematic mapping, using geologically plausible 3D primitives such as cylinders, planes and hollows. In this paper we show that a number of useful primitives derive from a common element — a hoop (with semi-circular shell cross-section) of finite radius, centered on the borehole. The parameters defining the hoop's plane, radius and thickness can be recovered sequentially from borehole radar data. Information about the location and shape of simply curved 3D reflectors can be recovered by finding common tangents to groups of kinematically derived rings.

Paper Details

Date Published: 12 April 2002
PDF: 5 pages
Proc. SPIE 4758, Ninth International Conference on Ground Penetrating Radar, (12 April 2002); doi: 10.1117/12.462214
Show Author Affiliations
N. Osman, Univ. of Sydney (Australia)
I. M. Mason, Univ. of Sydney (Australia)
G. Turner, SenseOre Services Pty. Ltd. (Australia)
E. Wedepohl, Subsurface Imaging (Australia)

Published in SPIE Proceedings Vol. 4758:
Ninth International Conference on Ground Penetrating Radar
Steven Koppenjan; Hua Lee, Editor(s)

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