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Evaluating the Multiple Coil Configurations of the EM38DD and DUALEM-21S Sensors to Detect Archaeological Anomalies

David Simpson UGent, Marc Van Meirvenne UGent, Timothy Saey UGent, Hans Vermeersch UGent, Jean Bourgeois UGent, Alexander Lehouck UGent, Liesbet Cockx UGent and Udayakantha V. Wellewatte Arachchige UGent (2009) ARCHAEOLOGICAL PROSPECTION. 16(2). p.91-102
abstract
The multiple coil configurations of two electromagnetic induction sensors were tested on afield with strong electrical and magnetic contrasts. The first sensor, EM38DD, measures either the apparent electrical conductivity (ECa or sigma(a)) or the apparent magnetic susceptibility (MSa or chi(a)) of the soil at two coil orientations. The second sensor, DUALEM-21S, measures both ECa and MSa at two coil orientations and two coil separations. The goal was to test if measuring with the multiple coils resulted in a better detection of near-surface artefacts and the natural soil variability. The ECa of all coil configurations was closely related to the depth of a clay substrate beneath the topsoil sandy loam, which was verified by soil augering. Configurations with a shallower theoretical depth of exploration were less influenced by the clay substrate. Combining two coil configurations revealed important ECa anomalies, not visible on individual measurements, associated with a brick wall foundation and a former ditch. The MSa maps showed totally different anomaly patterns, related to anthropogenic disturbances in the soil, such as the filling-in with brick rubble of a former pond. Depending on the depth and thickness of the disturbance and the relative response of the sensor configurations, the MSa anomalies were entirely positive for one configuration but other configurations also had negative anomalies. It was concluded that multiple coil configurations provide a better insight into the buildup of the soil profile and are better able to detect anomalies than single measurements.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (review)
publication status
published
subject
keyword
DEPTH, near-surface geophysics ELECTROMAGNETIC INDUCTION SENSOR, FEATURES, PROSPECTION, geoarchaeology, multiple-coil sensors, electrical conductivity, Electromagnetic induction, magnetic susceptibility
journal title
ARCHAEOLOGICAL PROSPECTION
Archaeol. Prospect.
volume
16
issue
2
pages
91 - 102
publisher
JOHN WILEY & SONS INC
place of publication
HOBOKEN USA
Web of Science type
Review
Web of Science id
000267181700002
JCR category
GEOSCIENCES, MULTIDISCIPLINARY
JCR impact factor
0.784 (2009)
JCR rank
120/151 (2009)
JCR quartile
4 (2009)
ISSN
1075-2196
DOI
10.1002/arp.349
language
English
UGent publication?
yes
classification
A1
id
741966
handle
http://hdl.handle.net/1854/LU-741966
date created
2009-09-08 10:47:51
date last changed
2015-06-17 11:16:51
@article{741966,
  abstract     = {The multiple coil configurations of two electromagnetic induction sensors were tested on afield with strong electrical and magnetic contrasts. The first sensor, EM38DD, measures either the apparent electrical conductivity (ECa or sigma(a)) or the apparent magnetic susceptibility (MSa or chi(a)) of the soil at two coil orientations. The second sensor, DUALEM-21S, measures both ECa and MSa at two coil orientations and two coil separations. The goal was to test if measuring with the multiple coils resulted in a better detection of near-surface artefacts and the natural soil variability. The ECa of all coil configurations was closely related to the depth of a clay substrate beneath the topsoil sandy loam, which was verified by soil augering. Configurations with a shallower theoretical depth of exploration were less influenced by the clay substrate. Combining two coil configurations revealed important ECa anomalies, not visible on individual measurements, associated with a brick wall foundation and a former ditch. The MSa maps showed totally different anomaly patterns, related to anthropogenic disturbances in the soil, such as the filling-in with brick rubble of a former pond. Depending on the depth and thickness of the disturbance and the relative response of the sensor configurations, the MSa anomalies were entirely positive for one configuration but other configurations also had negative anomalies. It was concluded that multiple coil configurations provide a better insight into the buildup of the soil profile and are better able to detect anomalies than single measurements.},
  author       = {Simpson, David and Van Meirvenne, Marc and Saey, Timothy and Vermeersch, Hans and Bourgeois, Jean and Lehouck, Alexander and Cockx, Liesbet and Wellewatte Arachchige, Udayakantha V.},
  issn         = {1075-2196},
  journal      = {ARCHAEOLOGICAL PROSPECTION},
  keyword      = {DEPTH,near-surface geophysics ELECTROMAGNETIC INDUCTION SENSOR,FEATURES,PROSPECTION,geoarchaeology,multiple-coil sensors,electrical conductivity,Electromagnetic induction,magnetic susceptibility},
  language     = {eng},
  number       = {2},
  pages        = {91--102},
  publisher    = {JOHN WILEY \& SONS INC},
  title        = {Evaluating the Multiple Coil Configurations of the EM38DD and DUALEM-21S Sensors to Detect Archaeological Anomalies},
  url          = {http://dx.doi.org/10.1002/arp.349},
  volume       = {16},
  year         = {2009},
}

Chicago
Simpson, David, Marc Van Meirvenne, Timothy Saey, Hans Vermeersch, Jean Bourgeois, Alexander Lehouck, Liesbet Cockx, and Udayakantha V. Wellewatte Arachchige. 2009. “Evaluating the Multiple Coil Configurations of the EM38DD and DUALEM-21S Sensors to Detect Archaeological Anomalies.” Archaeological Prospection 16 (2): 91–102.
APA
Simpson, D., Van Meirvenne, M., Saey, T., Vermeersch, H., Bourgeois, J., Lehouck, A., Cockx, L., et al. (2009). Evaluating the Multiple Coil Configurations of the EM38DD and DUALEM-21S Sensors to Detect Archaeological Anomalies. ARCHAEOLOGICAL PROSPECTION, 16(2), 91–102.
Vancouver
1.
Simpson D, Van Meirvenne M, Saey T, Vermeersch H, Bourgeois J, Lehouck A, et al. Evaluating the Multiple Coil Configurations of the EM38DD and DUALEM-21S Sensors to Detect Archaeological Anomalies. ARCHAEOLOGICAL PROSPECTION. HOBOKEN USA: JOHN WILEY & SONS INC; 2009;16(2):91–102.
MLA
Simpson, David, Marc Van Meirvenne, Timothy Saey, et al. “Evaluating the Multiple Coil Configurations of the EM38DD and DUALEM-21S Sensors to Detect Archaeological Anomalies.” ARCHAEOLOGICAL PROSPECTION 16.2 (2009): 91–102. Print.