Analysis of a borehole radar in cross-hole mode

Motoyuki Sato, Rudolf Thierbach

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)

Abstract

A theoretical approach to cross-hole radar measurements is presented. An approximate analytical form for the current distribution on an antenna in a borehole is derived, and the theoretical receiving signal of the borehole radar in the cross-hole 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 a pulse is discussed. The accuracy of tomographic analysis, which is often applied to cross-hole radar measurements, is strongly governed by this radiation pattern. It is found that, in practice, most borehole radars have a pattern of a λ/2 dipole antenna. However, the radiation pattern can be deformed by short pulse excitation, loading by the surrounding media, and coupling to the logging cable.

Original languageEnglish
Pages (from-to)899-904
Number of pages6
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume29
Issue number6
DOIs
Publication statusPublished - 1991 Nov 1

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Geochemistry and Petrology
  • Geophysics
  • Electrical and Electronic Engineering

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