CN104020497B - Z component receiving device for airborne Z-axis tipper electromagnetic survey system - Google Patents
Z component receiving device for airborne Z-axis tipper electromagnetic survey system Download PDFInfo
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- CN104020497B CN104020497B CN201410289739.9A CN201410289739A CN104020497B CN 104020497 B CN104020497 B CN 104020497B CN 201410289739 A CN201410289739 A CN 201410289739A CN 104020497 B CN104020497 B CN 104020497B
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Abstract
The invention relates to a Z component receiving device for an airborne Z-axis tipper electromagnetic survey system. The device is formed in the following ways: a collection system is fixed on a collection platform, the collection platform is hung on the lower part of a helicopter by three groups of steel wires which are more than 80m, a Z component receiving coil is hung on the lower part of the collection platform by virtue of a hanging rope, a preposed amplification circuit is fixed on the Z component receiving coil and connected with the output end of the Z component receiving coil, output of the preposed amplification circuit is connected with the collection system through a signal wire. A feedback coil generates a negative feedback magnetic field opposite to the direction of a detected magnetic field, so that the receiving coil forms a closed-loop flux negative feedback loop, the dynamic range of the output sensitivity of the receiving coil is reduced, and collection of output signals by the data collection system is favored; the receiving coil adopts a grading shielding structure, so that the shielding layer impedance can be reduced; a two-layer shielding structure is adopted, the first shielding layer floats, and the second shielding layer is grounded, so that high and low frequency electromagnetic interference of the environment outside the receiving coil can be effectively shielded, and the detection accuracy of the receiving coil can be improved.
Description
Technical field:
The sub- electromagnetic prospecting system z the present invention relates to a kind of aerogeophysical survey reception device, especially aviation z-axis are inclined
Component reception device.
Background technology:
Aviation z-axis incline sub- EMP method adopt helicopter as flight carrier, using natural earth's magnetic field or artificial magnetic
Field, as field source, receives, by reception device, the secondary field that underground medium produces because of eddy current effect, thus doing to subsurface resistivity
Go out to explain.Aviation z-axis sub- electromagnetic prospecting system z-component reception device of inclining is that aviation z-axis is inclined the core of sub- electromagnetic prospecting system
/ mono-, including induction coil, feedback coil, screen layer, homophase pre-amplification circuit.
Canadian geotech company proposed aviation z-axis early in 2006 and inclines sub- electromagnetic exploration method, but except part is situated between
The aviation z-axis that continues incline sub- electromagnetic exploration method application case in can find beyond reception device surface structure, and have not seen
Specific aviation z-axis is inclined the disclosure of sub- electromagnetic prospecting system z-component reception device structure.
Geotech company aviation z-axis inclines sub- electromagnetic prospecting system z-component reception device using glass steel skeleton, and weight is relatively
Weight is it is desirable to aircraft has very high load.Simultaneously because fiberglass belongs to rigid material, non-deformable, for be relatively large in diameter
For receiving coil, transport is also extremely inconvenient.
Domestic some research airborne time-domain electromagnetics, the article of aviation frequency domain electromagnetic methods or the device of removing at present has disclosure
Deliver outer, not yet find to be related to aviation z-axis and incline the paper of sub- electromagnetic exploration method or publishing of patent.
Content of the invention:
It is an object of the invention to provide a kind of aviation z-axis that is applied to is inclined the z-component reception device of sub- electromagnetic prospecting system.
The purpose of the present invention is achieved in the following ways:
Airborne electromagnetic survey system z-component reception device, is to be fixed on air-data acquisition platform by data collecting system 1
On 2, air-data acquisition platform 2 is hung in helicopter 4 bottom z-component receiving coil 5 by three groups of steel wire ropes 3 being more than 80m
Data acquisition platform 2 bottom in the air is hung by nylon hanging rope rope 6, puts before being fixed on homophase on z-component receiving coil 5
Big circuit 7 is connected with the outfan of z-component receiving coil 5, and the output of homophase pre-amplification circuit 7 is through homophase pre-amplification circuit
Holding wire 8 to data collecting system is connected and composed with data collecting system 1.
Z-component receiving coil 5 be circular by a diameter of 3.8m-10m or the elastic carbon skeleton 10 of regular polygon on equipped with
It is detachably fixed base 9 fixed inductor 11 no less than eight groups and feedback coil 16 is constituted.
Induction coil 11 by 12 circle 10 core shielding line coiling, with any one heart yearn one end in ten core shielding lines for rising
Point, by clockwise or counterclockwise ten heart yearns being connected into a wire, coiling initiating terminal is output signal end, and tail end is
Earth terminal, every circle 10 core shielding line is outer to be shielded by first screen layer 12.
First screen layer 12 any two points symmetrical with the center of circle are provided with shielding copper mesh breakpoint 13 and shielding copper mesh breakpoint
14, shielding copper mesh breakpoint 13 is connected with adjacent shields copper mesh breakpoint 13, shields copper mesh breakpoint 14 and adjacent shields copper mesh
Breakpoint 14 is connected.
By wide 2cm copper strips, uniform spiral outside induction coil 11 is wound around a circle to secondary shielding layer 15, and head and the tail do not connect.
Feedback coil 16 by wire in secondary shielding layer 15 external side parallel in induction coil 11 coiling, the number of turn is 3 circles, coiling
Direction is identical with induction coil, and coiling initiating terminal is feedback signal incoming end, and tail end is earth terminal.
The earth terminal of secondary shielding layer 15, induction coil 11 and feedback coil 16 all accesses homophase pre-amplification circuit 7
Earth terminal.
Beneficial effect: aviation z-axis is inclined sub- electromagnetic prospecting system z-component reception device, with elastic carbon skeleton as reception
Coil rack, reduces the weight of coil；Adopt detachable mounting structure, so that transport is convenient simultaneously.Feedback coil
Produce the negative feedback magnetic field contrary with tested magnetic direction, so that receiving coil constitutes closed loop magnetic flux negative feedback loop, reduce
The dynamic range of receiving coil output sensitivity, more favourable data collecting system is acquired to output signal.Receiving coil
Using double-layer shielding structure, first screen layer floats ground, and secondary shielding layer ground connection is such that it is able to effectively shield outside receiving coil
Environment low-and high-frequency electromagnetic interference, improves the detection accuracy of receiving coil.
Brief description:
Fig. 1 is that aviation z-axis is inclined sub- electromagnetic prospecting system z-component reception device structure chart
Fig. 2 is Fig. 1 receiving coil mounting structure figure
Fig. 3 screen layer sectional view
Fig. 4 first screen layer 12 any two points shield copper mesh breakpoint graph
1 data collecting system, 2 air-data acquisition platforms, 3 steel wire ropes, 4 helicopters, 5z component receiving coil, 6 nylon
Hanging rope, 7 homophase pre-amplification circuits, the holding wire of 8 homophase pre-amplification circuits to data collecting system, 9 firm bankings,
10 elastic carbon skeletons, 11 induction coils, 12 first screen layers, 13 shielding copper mesh breakpoints, 14 shielding copper mesh breakpoints, 15 the
Two screen layers, 16 feedback coils.
Specific embodiment:
It is described in further detail with reference to the accompanying drawings and examples:
Airborne electromagnetic survey system z-component reception device, is to be fixed on air-data acquisition platform by data collecting system 1
On 2, air-data acquisition platform 2 is hung in helicopter 4 bottom z-component receiving coil 5 by three groups of steel wire ropes 3 being more than 80m
Data acquisition platform 2 bottom in the air is hung by nylon hanging rope rope 6, puts before being fixed on homophase on z-component receiving coil 5
Big circuit 7 is connected with the outfan of z-component receiving coil 5, and the output of homophase pre-amplification circuit 7 is through homophase pre-amplification circuit
Holding wire 8 to data collecting system is connected and composed with data collecting system 1.
Z-component receiving coil 5 be circular by a diameter of 3.8m-10m or the elastic carbon skeleton 10 of regular polygon on equipped with
It is detachably fixed base 9 fixed inductor 11 no less than eight groups and feedback coil 16 is constituted.
Induction coil 11 by 12 circle 10 core shielding line coiling, with any one heart yearn one end in ten core shielding lines for rising
Point, by clockwise or counterclockwise ten heart yearns being connected into a wire, coiling initiating terminal is output signal end, and tail end is
Earth terminal, every circle 10 core shielding line is outer to be shielded by first screen layer 12.
First screen layer 12 any two points symmetrical with the center of circle are provided with shielding copper mesh breakpoint 13 and shielding copper mesh breakpoint
14, shielding copper mesh breakpoint 13 is connected with adjacent shields copper mesh breakpoint 13, shields copper mesh breakpoint 14 and adjacent shields copper mesh
Breakpoint 14 is connected.
By wide 2cm copper strips, uniform spiral outside induction coil 11 is wound around a circle to secondary shielding layer 15, and head and the tail do not connect.
Feedback coil 16 by wire in secondary shielding layer 15 external side parallel in induction coil 11 coiling, the number of turn is 3 circles, coiling
Direction is identical with induction coil, and coiling initiating terminal is feedback signal incoming end, and tail end is earth terminal.
The earth terminal of secondary shielding layer 15, induction coil 11 and feedback coil 16 all accesses homophase pre-amplification circuit 7
Earth terminal.
Embodiment 1
Data collecting system 1 is fixed on air-data acquisition platform 2 upper surface, is hung by three groups of steel wires 3 being more than 80m
In helicopter 4 bottom, thus reducing the electromagnetic interference to reception device for the helicopter.Z-component receiving coil 5 is generally circular in shape, leads to
Cross the nylon hanging rope rope 6 more than 8m no less than eight groups and hang platform lower in the air.Homophase pre-amplification circuit 7 passes through to fix
Base is fixed on the upside of z-component receiving coil, and is connected with receiving coil outfan, the output of homophase pre-amplification circuit via
The holding wire 8 of homophase pre-amplification circuit to data collecting system is delivered in data collecting system, is carried out by data collecting system
Data acquisition and pretreatment.
Z-component reception device receiving coil is fixed on elastic carbon bone by the base 9 that is detachably fixed no less than eight groups
On frame 10, including induction coil 11, feedback coil 16.Induction coil by 12 circle 10 core shielding line coiling, with ten core shielding lines
Any one heart yearn one end be starting point, in the direction of the clock ten heart yearns are connected into a wire, coil diameter be 3.8m,
Coiling initiating terminal is output signal end, and tail end is earth terminal.First screen layer 12 any two points symmetrical with the center of circle are provided with shielding
Copper mesh breakpoint 13 and shielding copper mesh breakpoint 14, shielding copper mesh breakpoint 13 is connected with adjacent shields copper mesh breakpoint 13, shielding
Copper mesh breakpoint 14 is connected with adjacent shields copper mesh breakpoint 14.
By wide 2cm copper strips, uniform spiral outside induction coil is wound around a circle to secondary shielding layer 15, and head and the tail do not connect.Instead
Feeder line circle 16 by wire in secondary shielding layer external side parallel in induction coil 11 coiling, the number of turn is 3 circles, coiling direction and the line of induction
Circle is identical, and coiling initiating terminal is feedback signal incoming end, and tail end is earth terminal.Secondary shielding layer 15, induction coil 11 and feedback
The earth terminal of coil 16 all accesses the earth terminal of homophase pre-amplification circuit 7.
Incline sub- electromagnetic prospecting system z-component reception device in helicopter take-off venue assembling aviation z-axis, tight in assembling process
Gu firm banking, and nylon hanging rope rope, air-data acquisition platform and steel wire are installed in order and launched to be placed in connect
Take-up circle side.Data collecting system is opened before taking off and is started to gather by helicopter, flies under ground experiment personnel record after taking off
Machine starts and terminates the moment along survey line flight.Data collecting system Real-time Collection storage receiving coil output in flight course
Secondary field signal, and the geographic location signal that the gps module within reception system is sent.Aircraft according to recording starts
And terminate the moment flown along survey line, intercept from the data of data collecting system storage and effectively believe along survey line secondary field
Number, and then according to secondary field information, subsurface resistivity is made explanations.
Receiving coil is suspended on helicopter bottom, with plane-parallel.The z that underground medium is produced due to eddy current effect divides
Amount secondary field (being represented with b) acts on receiving coil interior zone, according to the law of electromagnetic induction, the now output spirit of receiving coil
Sensitivity can be represented by the formula:
Because the dynamic range of induction coil output sensitivity is larger, in order to avoid saturation in homophase pre-amplification circuit
And affecting normal work, therefore amplification can not be too big, thus the data that the frequency range causing output sensitivity relatively low collects
Amplitude is too little.
After adding feedback coil, receiving coil forms closed loop magnetic flux negative feedback loop, i.e. induction coil inducted secondary field
And send into the amplification of homophase pre-amplification circuit, the output of amplifying circuit is simultaneously fed into feedback coil, thus producing and secondary field side
To contrary negative feedback magnetic field, offset part secondary field.Now the output sensitivity of receiving coil can be represented by the formula:
Pass through in practical application to change feedback resistance rfbResistance, change receiving coil output sensitivity dynamic range,
Thus avoiding due to homophase pre-amplification circuit output saturation impact normal work.
Embodiment 2
Data collecting system 1 is fixed on air-data acquisition platform 2 upper surface, is hung by three groups of steel wires 3 being more than 80m
In helicopter 4 bottom, thus reducing the electromagnetic interference to reception device for the helicopter.Z-component receiving coil 5 is shaped as just polygon
Shape, hangs platform lower in the air by being more than the nylon hanging rope rope 6 of 8m no less than eight groups.Homophase pre-amplification circuit 7 leads to
Cross firm banking to be fixed on the upside of z-component receiving coil, and be connected with receiving coil outfan, homophase pre-amplification circuit defeated
Go out and deliver in data collecting system via the holding wire 8 of homophase pre-amplification circuit to data collecting system, by data acquisition system
System carries out data acquisition and pretreatment.
Z-component reception device receiving coil is fixed on elastic carbon bone by the base 9 that is detachably fixed no less than eight groups
On frame 10, including induction coil 11, feedback coil 16.Induction coil by 12 circle 10 core shielding line coiling, with ten core shielding lines
Any one heart yearn one end be starting point, counterclockwise ten heart yearns are connected into a wire, coil diameter be 8m, around
Line initiating terminal is output signal end, and tail end is earth terminal.First screen layer 12 any two points symmetrical with the center of circle are provided with shielding copper
Net breakpoint 13 and shielding copper mesh breakpoint 14, shielding copper mesh breakpoint 13 is connected with adjacent shields copper mesh breakpoint 13, shields copper
Net breakpoint 14 is connected with adjacent shields copper mesh breakpoint 14.
By wide 2cm copper strips, uniform spiral outside induction coil is wound around a circle to secondary shielding layer 15, and head and the tail do not connect.Instead
Feeder line circle 16 by wire in secondary shielding layer external side parallel in induction coil 11 coiling, the number of turn is 3 circles, coiling direction and the line of induction
Circle is identical, and coiling initiating terminal is feedback signal incoming end, and tail end is earth terminal.Secondary shielding layer 15, induction coil 11 and feedback
The earth terminal of coil 16 all accesses the earth terminal of homophase pre-amplification circuit 7.
Incline sub- electromagnetic prospecting system z-component reception device in helicopter take-off venue assembling aviation z-axis, tight in assembling process
Gu firm banking, and nylon rope, air-data acquisition platform and steel wire are installed in order and launches to be placed in reception line
Circle side.Data collecting system is opened before taking off and is started to gather by helicopter, and after taking off, ground experiment personnel record gets off the plane out
Begin and terminate the moment along survey line flight.In flight course, data collecting system Real-time Collection stores the two of receiving coil output
Secondary field signal, and the geographic location signal that the gps module within reception system is sent.Aircraft according to recording start and
Terminate the moment along survey line flight, intercept effectively along the secondary field signal of survey line from the data of data collecting system storage, enter
And according to secondary field information, subsurface resistivity is made explanations.
Receiving coil is suspended on helicopter bottom, with plane-parallel.The z that underground medium is produced due to eddy current effect divides
Amount secondary field (being represented with b) acts on receiving coil interior zone, according to the law of electromagnetic induction, the now output spirit of receiving coil
Sensitivity can be represented by the formula:
Because the dynamic range of induction coil output sensitivity is larger, in order to avoid saturation in homophase pre-amplification circuit
And affecting normal work, therefore amplification can not be too big, thus the data that the frequency range causing output sensitivity relatively low collects
Amplitude is too little.
After adding feedback coil, receiving coil forms closed loop magnetic flux negative feedback loop, i.e. induction coil inducted secondary field
And send into the amplification of homophase pre-amplification circuit, the output of amplifying circuit is simultaneously fed into feedback coil, thus producing and secondary field side
To contrary negative feedback magnetic field, offset part secondary field.Now the output sensitivity of receiving coil can be represented by the formula:
Pass through in practical application to change feedback resistance rfbResistance, change receiving coil output sensitivity dynamic range,
Thus avoiding due to homophase pre-amplification circuit output saturation impact normal work.
Claims (3)
1. a kind of aviation z-axis inclines sub- electromagnetic prospecting system z-component reception device it is characterised in that being by data collecting system (1)
It is fixed on air-data acquisition platform (2), air-data acquisition platform (2) is hung by three groups of steel wire ropes (3) being more than 80m length
Hang over helicopter (4) bottom, z-component receiving coil (5) passes through nylon hanging rope rope (6) and hangs in acquisition platform (2) bottom, with
Phase pre-amplification circuit (7) is connected with the outfan of z-component receiving coil (5), and the output of pre-amplification circuit (7) is through same phase front
The holding wire (8) putting amplifying circuit to data collecting system is connected and composed with data collecting system (1)；
Z-component receiving coil (5) be by diameter 3.8m-10m is circular or regular polygon elasticity carbon skeleton (10) on equipped with many
It is detachably fixed base (9) fixed inductor (11) in eight groups and feedback coil (16) is constituted；
Induction coil (11) by 12 circle ten core shielding line coiling, with any one heart yearn one end in ten core shielding lines for rising
Point, by clockwise or counterclockwise ten heart yearns being connected into a wire, coiling initiating terminal is output signal end, and tail end is
Earth terminal, every circle ten core shielding line is outer to be shielded by first screen layer (12)；
Feedback coil (16) by 3 circle wires in secondary shielding layer (15) external side parallel in induction coil (11) coiling, coiling direction
Identical with induction coil (11), coiling initiating terminal is feedback signal incoming end, and tail end is earth terminal.
2. incline sub- electromagnetic prospecting system z-component reception device it is characterised in that first according to the aviation z-axis described in claim 1
Screen layer (12) any two points symmetrical with the center of circle are provided with shielding copper mesh breakpoint (13) and shielding copper mesh breakpoint (14), shielding
Copper mesh breakpoint (13) is connected with adjacent shields copper mesh breakpoint (13), and shielding copper mesh breakpoint (14) is broken with adjacent shields copper mesh
Point (14) is connected.
3. incline sub- electromagnetic prospecting system z-component reception device it is characterised in that second according to the aviation z-axis described in claim 1
By wide 2cm copper strips, uniform spiral outside induction coil (11) is wound around screen layer (15), and head and the tail do not connect, secondary shielding layer
(15), the earth terminal of induction coil (11) and feedback coil (16) all accesses the earth terminal of homophase pre-amplification circuit (7).
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| CN201410289739.9A CN104020497B (en) | 2014-06-24 | 2014-06-24 | Z component receiving device for airborne Z-axis tipper electromagnetic survey system |
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| CN201410289739.9A CN104020497B (en) | 2014-06-24 | 2014-06-24 | Z component receiving device for airborne Z-axis tipper electromagnetic survey system |
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| CN104020497B true CN104020497B (en) | 2017-02-01 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104443415B (en) * | 2014-11-27 | 2017-11-28 | 湖南航天远望科技有限公司 | A kind of aviation transient electromagnetic coil carrying structure |
| CN104865608B (en) * | 2015-05-22 | 2017-07-14 | 吉林大学 | Time-domain AEM motion artifacts detection means and suppressing method |
| CN105204076B (en) * | 2015-10-19 | 2017-07-14 | 吉林大学 | Helicopter transient electromagnetic detecting motion artifacts restraining device and noise suppressing method |
| CN108761358B (en) * | 2018-04-22 | 2021-07-23 | 成都理工大学 | Method for manufacturing magnetic probe of fluxgate sensor |
| CN113093294B (en) * | 2021-04-15 | 2023-04-07 | 中国科学院空天信息创新研究院 | Magnetic field sensor |
| CN114114429B (en) * | 2021-11-23 | 2023-06-16 | 东华理工大学 | Device and method for sounding and exploring ground-air frequency inclinometer |
| CN116299718A (en) * | 2023-03-03 | 2023-06-23 | 中国科学院地质与地球物理研究所 | Semi-aviation electromagnetic apparent resistivity measurement system and method |
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