Comparing performance of instrumental drift correction by linear and quadratic adjusting in inductive electromagnetic data

Author(s)

Neris dos Santos, Vinicius Rafael ^[1] ; Porsani, Jorge Luis ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer IAG, Dept Geofis, BR-05508090 Sao Paulo - Brazil

• Document type: Journal article
• Source: JOURNAL OF APPLIED GEOPHYSICS; v. 73, n. 1, p. 1-7, JAN 2011.
• Web of Science Citations: 7

Abstract

Electromagnetic induction (EMI) method results are shown for vertical magnetic dipole (VMD) configuration by using the EM38 equipment. Performance in the location of metallic pipes and electrical cables is compared as a function of instrumental drift correction by linear and quadratic adjusting under controlled conditions. Metallic pipes and electrical cables are buried at the IAG/USP shallow geophysical test site in Sao Paulo City. Brazil. Results show that apparent electrical conductivity and magnetic susceptibility data were affected by ambient temperature variation. In order to obtain better contrast between background and metallic targets it was necessary to correct the drift. This correction was accomplished by using linear and quadratic relation between conductivity/susceptibility and temperature intending comparative studies. The correction of temperature drift by using a quadratic relation was effective, showing that all metallic targets were located as well deeper targets were also improved. (C) 2010 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 09/05882-6 - Automatic detection and classification of buried interferences with GPR using Artificial Neural Networks (ANNs): Study on IAG/USP test site.
• Grantee: Vinicius Rafael Neris dos Santos
• Support Opportunities: Scholarships in Brazil - Doctorate