NDLI: Effect of Aluminum Neutron Probe Access Tubes on the Apparent Electrical Conductivity Recorded by an Electromagnetic Soil Survey Sensor

Content Provider	IEEE Xplore Digital Library
Author	Stanley, J.N. Lamb, D.W. Irvine, S.E. Schneider, D.A.
Copyright Year	2004
Abstract	Correlating soil moisture content to apparent electrical conductivity (σa), derived from above-ground, electromagnetic induction (EMI) dipole sensors, requires capacitance or neutron probe moisture meters. To this end, plastic or metallic access tubes (ca. 0.5-2 m long, 40-50 mm internal diameter, and 1-2 mm thickness walls) are inserted vertically into the soil to allow the probe to be lowered for moisture readings at a series of soil depths. The impact of these tubes on measurements derived from above-ground EMI sensors, when the sensor is in proximity or adjacent to these buried tubes, in unknown. We report on the impact of widely used aluminum (Al), as well as popular plastic alternatives of polyethylene (PE), polyvinylchloride (PVC) access tubes on the lateral σa profiles of an EM38 EMI meter as it is moved along survey transects that pass beside the access tubes. There was no significant difference observed between the EMI meter readings of the bare soil and the vertical holes created to house the access tubes nor when the plastic access tubes were in place. However, the Al tubes showed a considerable variation in readings once the EM38 meter was within 50 cm of the tube location. A theoretical model, based on a single dipole transmitter and receiver coil, and a thin, cylindrical conducting shell located beneath the earth' s surface confirmed the horizontal eddy currents, traveling around the tube shell to be responsible for the observed deviation in the sensor response when in proximity to the metallic tube.
Sponsorship	IEEE Geoscience and Remote Sensing Society
Starting Page	333
Ending Page	336
Page Count	4
File Size	2512692
File Format	PDF
ISSN	1545598X
Volume Number	11
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	soil moisture survey Access tubes eddy currents electromagnetic induction precision agriculture
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Geotechnical Engineering and Engineering Geology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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