An example of 3D conductivity mapping using the TEMPEST airborne electromagnetic system

2000 ◽  
Vol 31 (1-2) ◽  
pp. 162-172 ◽  
Author(s):  
Richard Lane ◽  
Andy Green ◽  
Chris Golding ◽  
Matt Owers ◽  
Phil Pik ◽  
...  
Keyword(s):  
Electromagnetic System ◽  
The Tempest ◽  
Airborne Electromagnetic

Development And Evaluation Of A Second-Generation Airborne Electromagnetic System For Detection Of Unexploded Ordnance

2002 ◽  
Author(s):  
William E. Doll ◽  
T. Jeffrey Gamey ◽  
Les P. Beard ◽  
David T. Bell ◽  
J.S. Holladay ◽  
...  
Keyword(s):  
Second Generation ◽  
Unexploded Ordnance ◽  
Electromagnetic System ◽  
Airborne Electromagnetic

MAPPING EARTH CONDUCTIVITIES USING A MULTIFREQUENCY AIRBORNE ELECTROMAGNETIC SYSTEM

Geophysics ◽  
1978 ◽  
Vol 43 (3) ◽  
pp. 563-575 ◽  
Author(s):  
H. O. Seigel ◽  
D. H. Pitcher
Keyword(s):  
Thin Sheet ◽  
Radar Altimeter ◽  
Electromagnetic System ◽  
Near Surface ◽  
Quantitative Estimates ◽  
Simple Geometry ◽  
Airborne Electromagnetic ◽  
Groundwater Mapping ◽  
Actual Field ◽  
Depth Of Burial

The Tridem vertical coplanar airborne electromagnetic system provides simultaneous in‐phase and quadrature information at frequencies of 500, 2000 and 8000 Hz. The system can map a broad range of earth conductors of simple geometry and provide quantitative estimates of their conductivities and dimensions. Computer programs have been developed to automatically interpret the six channels of Tridem data, plus the output of an accurate radar altimeter, to determine the depth of burial, conductivity and thickness of a near‐surface, flat‐lying conducting horizon. In limiting cases, the interpretation provides the conductance (conductivity‐thickness product) of a thin sheet (ranging from 100 mmhos to 100 mhos) or the conductivity of a homogeneous earth (ranging from 1 mmhos/m to 10 mhos/m). Two actual field examples are presented from Ontario, Canada; one relating to the mapping of overburden conditions (sand, clay and rock, etc) and the other to the mapping of the distribution of a buried lignite deposit. Other areas of potential application of the system to surficial materials would include groundwater mapping, permafrost investigations, and civil engineering studies for roads and pipelines.

27. Viability of an Airborne Electromagnetic System for Mapping of Shallow Buried Metals

2005 ◽  
pp. 653-662
Author(s):  
William E. Doll ◽  
T. Jeffrey Gamey ◽  
J. Scott Holladay ◽  
James L. C. Lee
Keyword(s):  
Electromagnetic System ◽  
Airborne Electromagnetic

COMPUTER DATA PROCESSING AND QUANTITATIVE INTERPRETATION OF AIRBORNE RESISTIVITY SURVEYS

Geophysics ◽  
1975 ◽  
Vol 40 (5) ◽  
pp. 818-830 ◽  
Author(s):  
G. J. Palacky ◽  
F. L. Jagodits
Keyword(s):  
Electric Fields ◽  
Simultaneous Recording ◽  
Quantitative Interpretation ◽  
Geologic Mapping ◽  
Electromagnetic System ◽  
Computer Data ◽  
Type Curves ◽  
Intermediate Data ◽  
Processing Cost ◽  
Airborne Electromagnetic

The recently constructed airborne electromagnetic system called E-Phase measures the intensity of the vertical and horizontal electric fields. Standard broadcasting, VLF, and LF navigation aid transmitters are used as sources of the primary EM field. A system of this kind responds best to horizontal layers of large extent and therefore is suitable for geologic mapping and for the detection of resistive materials such as gravel and permafrost. A successful application of the system would not have been possible without digital recording of the data and subsequent computer processing. An efficient algorithm consisting of three processing steps assures low processing cost and provides for two intermediate data checks. Final outputs are printer plots of apparent resistivity for all flight lines and maps of stacked profiles or contours. Quantitative interpretation was made possible by the simultaneous recording of the data at three transmitter frequencies and by the availability of theoretical solutions for layered media. Instead of generating an atlas of type curves, an interactive program was written which enables the geophysicist to rapidly obtain apparent resistivities assuming a three‐layer model. A close match with the measured data is easy to achieve when a reasonable estimate of two of the parameters (resistivities, thicknesses) can be made initially. The interpretation procedure is demonstrated on a case history, a 1973 survey conducted near Wadena, Saskatchewan.

scholarly journals The Development and Applications of the Semi-Airborne Electromagnetic System in China

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 104956-104966 ◽  
Author(s):  
Xin Wu ◽  
Guoqiang Xue ◽  
Guangyou Fang ◽  
Xiu Li ◽  
Yanju Ji
Keyword(s):  
Electromagnetic System ◽  
Airborne Electromagnetic

Assessment of the TEM‐8 Airborne Electromagnetic System for Ground Conductivity Measurements

2012 ◽  
Author(s):  
William E. Doll ◽  
Jeannemarie Norton ◽  
T. Jeffrey Gamey ◽  
Bret Watkins ◽  
Barry Kinsall ◽  
...  
Keyword(s):  
Conductivity Measurements ◽  
Electromagnetic System ◽  
Airborne Electromagnetic ◽  
Ground Conductivity

scholarly journals The Finite-Conducting Ground’s Effect on the Inductance of a Rectangular Loop

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Xiao Jia ◽  
Lihua Liu ◽  
Guangyou Fang
Keyword(s):  
Time Domain ◽  
Accurate Method ◽  
Perfect Conductor ◽  
Current Waveform ◽  
Electromagnetic System ◽  
Resonance Circuit ◽  
Airborne Electromagnetic

In an airborne electromagnetic system, which transmits time-domain half-sine current waves generated by a resonance circuit, the inductance of the transmitting loop is of great significance and directly related to parameters of the half-sine current waveform. However, in general, the effect of a finite-conducting ground on the inductance of the transmitting loop was neglected, or the ground was handled as a perfect conductor. In other words, there was no accurate method to evaluate ground’s effect on the inductance of the transmitting loop. Therefore, a new and convenient algorithm, calculating ground’s effect on the inductance of a rectangular loop, is proposed in this paper. An experiment was constructed afield, showing that the inductance increased gradually when the loop was lifted up from 0 m to 30 m, which supported the algorithm positively.

THEORETICAL RESPONSE OF A TIME‐DOMAIN, AIRBORNE, ELECTROMAGNETIC SYSTEM

Geophysics ◽  
1969 ◽  
Vol 34 (5) ◽  
pp. 729-738 ◽  
Author(s):  
P. H. Nelson ◽  
D. B. Morris
Keyword(s):  
Time Domain ◽  
Computational Procedure ◽  
Response Curves ◽  
Electromagnetic System ◽  
Magnetic Dipoles ◽  
System Calibration ◽  
Input System ◽  
Airborne Electromagnetic ◽  
Airborne Em ◽  
Thickness Parameter

The secondary magnetic field induced by a time‐domain, airborne EM system is calculated by transforming the tabulated mutual impedances of two magnetic dipoles above an earth of homogeneous or layered resistivity structure. The computational procedure is extended to produce response curves useful in interpreting data from a particular system, the Barringer Input system. It is demonstrated that the apparent resistivity can be estimated through use of the receiver channel ratios, a method which is independent of absolute system calibration. Layered earth calculations indicate to what extent conductive overburden cases can be readily distinguished, in terms of the conductivity‐thickness parameter, but separate interpretation of layer resistivity and thickness will require an amplitude‐calibrated flight system.

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