ransient Electromagnetic Field Characteristics of A New Source-Conical Source

DOI

10.2991/iceeg-16.2016.103How to use a DOI?

Keywords

transient electromagnetic method, Cone-shaped source, Transient process, Apparent resistivity, Mutual inductance

Abstract

The mutual inductance coupling of the traditional multi-turn coils is relatively large, which makes the shallow "blind area" of the detection increase. Therefore, a conical field source device was proposed, and the calculation formula of the radius of each turn coil in the device was given. First of all, the theoretical analytic expression was used to calculate and analyze the characteristic of primary field and secondary field of the conical field source in homogeneous medium, and then the comparison of the mutual inductance of the conical field source device and the multi-turn coils was carried out. After that, the fast Hankel transform and improved cosine transform numerical filtering algorithm were applied to calculate the electromagnetic response of horizontal layered earth under excitation of the step current. Finally, the induced electromotive force was converted into a vertical magnetic field, and then the apparent resistivity of the layered medium was obtained. The study found that the mutual inductance of multi-turn coils is about 9 times of the conical field source's, which have the same equivalent magnetic moment of 926.1Am2. The characteristic of primary and secondary field of the conical field source is the same as that of the multi-turn coils; The magnetic field intensity of conical field source and multi-turn coils differs by two orders of magnitude under the three layers geoelectric model of H-type, but both of similar characteristic, and apparent resistivity that is consistent with the model can be available.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Haiyan Yang
AU  - Fengping Li
PY  - 2016/06
DA  - 2016/06
TI  - ransient Electromagnetic Field Characteristics of A New Source-Conical Source
BT  - Proceedings of the 7th International Conference on Environment and Engineering Geophysics & Summit Forum of Chinese Academy of Engineering on Engineering Science and Technology
PB  - Atlantis Press
SP  - 381
EP  - 383
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceeg-16.2016.103
DO  - 10.2991/iceeg-16.2016.103
ID  - Yang2016/06
ER  -