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Application of EM tomography to detect a buried pipe; EM tomography no maisetsukan tansa eno tekiyorei

Abstract

EM tomography was applied to detect buried pipes. Underground radar exploration method is limited to 10m in depth. Positive use of bored holes is desirable, and in such case, magnetic logging based on the magnetic susceptibility (MS) contrast between buried body and surrounding ground is effective. The primary magnetic field is generated by coil current, and the secondary one is generated by the primary one responding to foreign bodies in the ground. Since the measured primary magnetic field of low frequency within 10Hz can be treated as static magnetic field responding to MS in the ground, it is useful to determine MS distributions. Since the measured magnetic field of high frequency within 100kHz can be treated as induction field responding to conductivity in the ground, it is useful to determine resistivity distributions. The EM tomography which can image both above distributions by using electromagnetic wave in a wide frequency range, was applied to detect buried pipes. The EM tomography could detect an buried foreign body of 3m in diameter at 10m in distance between bored holes. The theoretical equation for analysis was also derived. 5 refs., 9 figs., 1 tab.
Authors:
Sakashita, S [1] 
  1. OYO Corp., Tokyo (Japan)
Publication Date:
Oct 01, 1996
Product Type:
Conference
Report Number:
CONF-9610294-
Reference Number:
SCA: 440700; 540250; PA: NEDO-96:914783; EDB-97:075220; SN: 97001782559
Resource Relation:
Conference: 95. SEGJ conference, Butsuri tansa gakkai dai 95 kai (1996 nendo shuki) gakujutsu koenkai, Kyoto (Japan), 21-23 Oct 1996; Other Information: PBD: Oct 1996; Related Information: Is Part Of Proceedings of the 95th SEGJ Conference; PB: 344 p.; Butsuri tansa gakkai dai 95 kai (1996 nendo shuki) gakujutsu koenkai koen ronbunshu
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 54 ENVIRONMENTAL SCIENCES; PIPES; UNDERGROUND; DETECTION; TOMOGRAPHY; ELECTROMAGNETIC SURVEYS; RADAR; MAGNETIC SUSCEPTIBILITY; FARADAY INDUCTION; FREQUENCY DEPENDENCE; ELECTRIC CONDUCTIVITY
OSTI ID:
472688
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97743637; TRN: 96:914783
Availability:
Available from The Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, Japan; OSTI as DE97743637
Submitting Site:
NEDO
Size:
pp. 250-254
Announcement Date:

Citation Formats

Sakashita, S. Application of EM tomography to detect a buried pipe; EM tomography no maisetsukan tansa eno tekiyorei. Japan: N. p., 1996. Web.
Sakashita, S. Application of EM tomography to detect a buried pipe; EM tomography no maisetsukan tansa eno tekiyorei. Japan.
Sakashita, S. 1996. "Application of EM tomography to detect a buried pipe; EM tomography no maisetsukan tansa eno tekiyorei." Japan.
@misc{etde_472688,
title = {Application of EM tomography to detect a buried pipe; EM tomography no maisetsukan tansa eno tekiyorei}
author = {Sakashita, S}
abstractNote = {EM tomography was applied to detect buried pipes. Underground radar exploration method is limited to 10m in depth. Positive use of bored holes is desirable, and in such case, magnetic logging based on the magnetic susceptibility (MS) contrast between buried body and surrounding ground is effective. The primary magnetic field is generated by coil current, and the secondary one is generated by the primary one responding to foreign bodies in the ground. Since the measured primary magnetic field of low frequency within 10Hz can be treated as static magnetic field responding to MS in the ground, it is useful to determine MS distributions. Since the measured magnetic field of high frequency within 100kHz can be treated as induction field responding to conductivity in the ground, it is useful to determine resistivity distributions. The EM tomography which can image both above distributions by using electromagnetic wave in a wide frequency range, was applied to detect buried pipes. The EM tomography could detect an buried foreign body of 3m in diameter at 10m in distance between bored holes. The theoretical equation for analysis was also derived. 5 refs., 9 figs., 1 tab.}
place = {Japan}
year = {1996}
month = {Oct}
}