Primary field self-counteracting device for time-domain airborne electromagnetic method

An aviation electromagnetic and time domain technology, applied in the direction of special electromagnetic/magnetic detection during transportation, can solve the problem of small dynamic range of secondary field signals, achieve ideal system exploration effect, increase dynamic range, and improve system detection The effect of efficiency

Inactive Publication Date: 2011-09-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a primary field self-cancellation device suitable for the time-domain aeronautical electromagnetic method to solve the problem that the dynamic range of the secondary field signal is too small due to the excessive amplitude of the primary field.

Method used

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  • Primary field self-counteracting device for time-domain airborne electromagnetic method
  • Primary field self-counteracting device for time-domain airborne electromagnetic method
  • Primary field self-counteracting device for time-domain airborne electromagnetic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The outside of the transmitting coil 10 is encapsulated by glass steel tubes, and after encapsulation, it is fastened by a cross-shaped bracket 9, and the spokes 11 and the suspension ropes 12 are suspended on the lower part of the helicopter 13 through the device. The z-component receiving coil 1 is placed on the upper part of the transmitting coil 10 after being damped by the shock-absorbing pad 8 and is divided into two parts by the transmitting coil 10. The magnetic flux generated by the transmitting coil 10 is equal in size in the two spaces of the z-component receiving coil 1 in the opposite direction. The x-component receiving coil 2 is perpendicular to the z-component receiving coil 1 and the flying direction of the helicopter 13 , and the center of the x-component receiving coil 2 is on the diameter of the transmitting coil 10 . The y-component receiving coil 3 is perpendicular to the z-component receiving coil 1 and perpendicular to the x-component receiving c...

Embodiment 2

[0033] Helicopter 13 is equipped with data collection system 7, and DC power is provided by helicopter 13, and cross-shaped bracket 9 supports transmitting coil 10, x component receiving coil 2, y component receiving coil 3 and calibration coil 14, and calibration coil 14 passes wire Connect with the data collection system 7, the upper end of the hanging rope 12 is tied to the bilge of the helicopter 13, the lower end of the hanging rope 12 is tied to the center of the cross support 9, the upper end of the hanging spoke 11 is tied to the middle part of the hanging rope 12, four More than two hanging spokes 11 lower ends are tied on the transmitting coil 10 at equal angles, and the hanging spokes 11 are unequal lengths before and after, and its length depends on the flight speed of the helicopter 13. On the transmitting coil 10, the effective area of ​​the z-component receiving coil 1 is divided into two parts by the transmitting coil 10, the excitation magnetic field generated ...

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Abstract

The invention relates to a primary field self-counteracting device for a time-domain airborne electromagnetic method. A data acquisition system is mounted on an airplane; a cross-shaped support for supporting an emission coil, a z-component receiving coil, an x-component receiving coil, a y-component receiving coil and a calibration coil is hung on the bottom of an airplane cabin through a sling;and the z-component receiving coil, the x-component receiving coil and the y-component receiving coil are connected with a pre-amplifier through leads, and then connected with a data recording systemthrough signal lines. Compared with the existing similar equipment, the primary field self-counteracting device can effectively suppress the influence of the primary field on the receiving coils, thereby greatly widening the dynamic range of the secondary field signals received by the receiving coil and improving the exploration accuracy and efficiency. In addition, the receiving coils are of a double-damping structure, which can effectively protect the receiving coils so as to obviate the influences of the vibration on the received signals and improve the receiving quality of the late secondary field signals. The calibration coil has a 45-degree angle with the three receiving coils respectively to provide convenience for personnel in checking the system performance, thereby improving thesystem checking efficiency.

Description

Technical field: [0001] The invention relates to an aerial geophysical survey receiving device, in particular to a pod-type helicopter time-domain aerial electromagnetic survey device. Background technique: [0002] The pod-type helicopter aerial time-domain electromagnetic exploration system uses a helicopter as a flight carrier to excite the underground medium by transmitting a high-power magnetic field signal. During the transmission gap of the magnetic field signal, the receiving device is used to receive the secondary energy produced by the underground medium due to the eddy current effect. field to explain the subsurface resistivity structure. The pod-type helicopter aeronautical time-domain electromagnetic survey receiving device is a part of the aeronautical time-domain electromagnetic survey system, including induction coils or magnetic induction sensors, signal conditioning modules, data acquisition and processing systems, and calibration coils for checking whether...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/17
Inventor 王言章王世隆林君随阳轶
Owner JILIN UNIV
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