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Sensors 2016, 16(4), 508; doi:10.3390/s16040508

An Optimized Air-Core Coil Sensor with a Magnetic Flux Compensation Structure Suitable to the Helicopter TEM System

1,2,†
,
1,2,†
,
1,2
,
1,2
and
1,2,*
1
Key Laboratory of Geo-exploration Instruments, Ministry of Education of China, Changchun 130061, China
2
College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Wilmar Hernandez
Received: 29 January 2016 / Revised: 3 April 2016 / Accepted: 6 April 2016 / Published: 12 April 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [5812 KB, uploaded 12 April 2016]   |  

Abstract

The air-core coil sensor (ACS) is widely used as a transducer to measure the variation in magnetic fields of a helicopter transient electromagnetic (TEM) system. A high periodic emitting current induces the magnetic field signal of the underground medium. However, such current also generates a high primary field signal that can affect the received signal of the ACS and even damage the receiver. To increase the dynamic range of the received signal and to protect the receiver when emitting current rises/falls, the combination of ACS with magnetic flux compensation structure (bucking coil) is necessary. Moreover, the optimized ACS, which is composed of an air-core coil and a differential pre-amplifier circuit, must be investigated to meet the requirements of the helicopter TEM system suited to rapid surveying for shallow buried metal mine in rough topography. Accordingly, two ACSs are fabricated in this study, and their performance is verified and compared inside a magnetic shielding room. Using the designed ACSs, field experiments are conducted in Baoqing County. The field experimental data show that the primary field response can be compensated when the bucking coil is placed at an appropriate point in the range of allowed shift distance beyond the center of the transmitting coil and that the damage to the receiver induced by the over-statured signal can be solved. In conclusion, a more suitable ACS is adopted and is shown to have better performance, with a mass of 2.5 kg, resultant effective area of 11.6 m2 (i.e., diameter of 0.496 m), 3 dB bandwidth of 66 kHz, signal-to-noise ratio of 4 (i.e., varying magnetic field strength of 0.2 nT/s), and normalized equivalent input noise of 3.62 nV/m2. View Full-Text
Keywords: helicopter TEM system; ACS; magnetic flux compensation structure; optimization of the ACS helicopter TEM system; ACS; magnetic flux compensation structure; optimization of the ACS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chen, C.; Liu, F.; Lin, J.; Zhu, K.; Wang, Y. An Optimized Air-Core Coil Sensor with a Magnetic Flux Compensation Structure Suitable to the Helicopter TEM System. Sensors 2016, 16, 508.

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