CN103499844A - Total-stroke and total-space transient electromagnetic device and measuring method - Google Patents
Total-stroke and total-space transient electromagnetic device and measuring method Download PDFInfo
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- CN103499844A CN103499844A CN201310427387.4A CN201310427387A CN103499844A CN 103499844 A CN103499844 A CN 103499844A CN 201310427387 A CN201310427387 A CN 201310427387A CN 103499844 A CN103499844 A CN 103499844A
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Abstract
The invention relates to a total-stroke and total-space transient electromagnetic device and measuring method. The device comprises a transmitting unit and a multi-channel receiving unit, wherein the transmitting unit and the multi-channel receiving unit are respectively connected with a signal processing unit, the signal processing unit is connected with a main engine through a communication unit, relevant parameters are set through operation software of the main engine, the receiving unit and the transmitting unit jointly achieve field source excitation and complete collection, recording and the like of an induction signal and an excitation source signal, the induction signal and the excitation source signal are transmitted to the main engine through an RS485, and the display, storage, management and the like of the data are achieved. According to the total-stroke and total-space transient electromagnetic device and measuring method, the self-induction and mutual induction influences can be effectively reduced, the signal to noise ratio and the sensitivity are improved, receiving coils can be combined into different types according to the detection requirement, the different detection effects can be obtained, and the judgment on the direction of an abnormal body can be achieved under the total-space situation. The number of detection blind zones can be reduced, the superficial zone detection effect can be improved, an ARM quad-core processer hardware platform is adopted, a special embedded type operation system is configured, and real-time imaging, comparison, judgment and subsequent analysis can be conveniently carried out on the measured data.
Description
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Technical field
The present invention relates to geophysical survey device and measuring method field, particularly a kind of omnidistance total space transient electromagnetic device and measuring method.
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Background technology
As everyone knows, transient electromagnetic method claims again TDEM (TEM), it is according to electromagnetic induction principle, utilize earth-free coil to electromagnetic field of underground transmission, at an electromagnetic field tempus intercalare, use the method for earth-free coil observation secondary field, carry out the physical difference analysis on different lithology stratum.
In conventional transient electromagnetic method exploration, for reaching certain investigation depth, transmitter-receiver device is often used multiturn coil.Particularly in mine laneway, explored, as while carrying out the work such as forward probe, due to interference such as metal anchors nets in tunnel, the essential loop line number of turn that increases, increase magnetic moment, to increase depth of exploration.And the increase of coil turn also makes the self-induction of coil and mutual mutual inductance increase the impact of early time data, the turn-off time increases, and early stage data distorted, can not be used.
In principle, TEM not only can measure the geologic structure of shallow-layer, and can measure the deep layer tectonic structure, and the ability of TEM method detection superficial part structure is mainly carried by early signal, therefore, the early time data distorted that the self-induction of coil and mutual inductance impact cause directly affects the measurement of shallow geological structure, makes conventional transient electromagnetic method have a detection blind area, can reach tens meters.
And, in mine laneway, by transient electromagnetic method when poorly plastid is surveyed, with completely different to being surveyed under earth's surface on earth's surface.The former belongs to underground total space inverting, wants to determine position and the scope of anomalous body, needs to consider the combined influence of surrounding space.Therefore, in mine laneway, while utilizing transient electromagnetic method to be surveyed anomalous body, exist the problem of how the anomalous body orientation being differentiated.
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Summary of the invention
The objective of the invention is the deficiency existed in order to solve the above-mentioned background technology, propose a kind ofly can effectively reduce self-induction and mutual mutual inductance between coil, can reduce blind area and can carry out to anomalous body transient electromagnetic device and the measuring method of total space effective location.
For achieving the above object, the present invention adopts following technical scheme: transient electromagnetic device between the omnidistance total space, comprise the transmitter unit be connected with transmitting coil and the hyperchannel receiving element be connected with receiving coil, described transmitter unit is connected with signal processing unit respectively with the hyperchannel receiving element, and described signal processing unit is connected with main frame through communication unit; Described transmitter unit comprises multifrequency transmitter, an A/D conversion chip and the excitation power supply for powering to transmitting coil; Described hyperchannel receiving element comprises prime amplifier and the 2nd A/D conversion chip be connected with at least two receiving coils; A described A/D conversion chip gathers the multifrequency transmitter current information and sends into signal processing unit processes, and described the 2nd A/D conversion chip will be sent into signal processing unit processes after prime amplifier zooms in or out signals collecting; Described signal processing unit consists of field programmable logic unit (hereinafter to be referred as FPGA) and random access memory (hereinafter to be referred as RAM), and described communication unit deposits main frame in for the data by described RAM storage.
Described transmitting coil is placed in described receiving coil outer periphery or top, end, is provided with the 0.1-0.6m gap therebetween.
Described receiving coil is the double reception coil consisted of main receiving coil and secondary receiving coil; Wherein major and minor receiving coil size is identical, and the Parallel Symmetric setting, and spacing is 6-12cm; Described transmitting coil is positioned over the two ends up and down top of described double reception coil and mutually vertical with the double reception coil.
Described receiving coil consists of main receiving coil and secondary receiving coil; Wherein major and minor receiving coil size is identical, and the Parallel Symmetric setting, and spacing is 6-12cm; Described main receiving coil is placed in transmitting coil and coplanar and common midpoint with it.
Described receiving coil consists of main receiving coil, secondary receiving coil and sub-receiving coil; Wherein major and minor receiving coil size is identical, and the Parallel Symmetric setting, and spacing is 6-12cm; Sub-receiving coil is the single turn small coil, is placed in main receiving coil; Described transmitting coil is placed on outside main receiving coil, and transmitting coil, main receiving coil are identical in same plane and central point with sub-receiving coil three; Wherein, transmitting coil and main receiving coil interval 0.1 m-0.6m, main receiving coil and sub-receiving coil interval 0.05 m-0.3m.
Described receiving coil consists of main receiving coil, secondary receiving coil and sub-receiving coil, and described sub-receiving coil is the single turn small coil, is placed in main receiving coil; Described transmitting coil is placed on outside main receiving coil, and transmitting coil, main receiving coil are identical in same plane and central point with sub-receiving coil three; The disposing way of described secondary receiving coil and main receiving coil and sub-receiving coil is quadrature or oblique.
Described receiving coil is nested with and is formed the double reception coil by main receiving coil and secondary receiving coil, and described transmitting coil is positioned over the periphery of the double reception coil be nested with, and described transmitting coil is positioned at same plane with the double reception coil be nested with and both central points are identical.
The quantity of described prime amplifier and the 2nd A/D conversion chip is according to the corresponding configuration of the number of receiving coil, and several synchronous channel communications interfaces that receive measurement data of relative set.
Described main frame adopts ARM tetra-core processors, real-time analysis data; Described communication unit is RS485 interface or USB interface.
Another object of the present invention is to provide the transient electromagnetic measuring method of described device, comprises the following steps:
(1) carrying device enters tunnel detecting area under mine;
(2) connection of the main frame of finishing device, collecting unit, transmitter unit and each assembly of hyperchannel receiving element, and will launch, receiving coil presses need of work and aim to specify the anomalous body direction of measurement, press main frame and collecting unit power knob, enter duty;
(3) the collecting unit correlation parameter is set;
(4) after parameter sets up, press the data acquisition button on main frame, excite and set up field source one time, after primary field runs into the target geologic body, can produce the secondary field induced signal, prime amplifier amplifies induced signal, after the 2nd A/D conversion chip gathers it, send into FPGA and deposit random access memory in, and deposit main frame in through communication unit (RS485 interface or USB interface) after reading the RAM data with FPGA, by main frame, carry out data demonstration and management;
(5) if receiving coil adopts two or more coil assembly device forms, the number of passage is identical with the number of receiving coil, after receiving coil receives induced signal, the prime amplifier that each receiving coil is corresponding and the 2nd A/D collector are amplified and are gathered each induced signal respectively, and send into FPGA and carry out the data storage, finally by communication unit (RS485 interface or USB interface), deposit main frame in, by main frame, carry out data demonstration and management.
(6) according to required angular movement receiving coil, it is positioned over to other target anomalous body position to be measured, by step (3)-(5), surveyed.
In step (3), described correlation parameter is sample mode, sampling time, stacking fold, sample frequency Ce Hece road number.
beneficial effect of the present invention:the first, the invention provides a plurality of receiving cables, can receive the induced signal of a plurality of coils.The second, according to the difference of surveying purpose, the form that receiving coil one-tenth capable of being combined is different, and can obtain different Effect on Detecting:
for total space detection problem, main receiving coil is identical with secondary receiving coil size, and Parallel Symmetric is placed, one of them receiving coil is to measure and use for detection direction, another receiving coil is for differentiating induced signal in the other direction, distinguishable whole-space effect, realize under the total space condition differentiation to the anomalous body orientation;
for traditional transition blind zone problem, adopt main receiving coil (large scale, multiturn, large magnetic moment) and sub-receiving coil (small size, multiturn/single turn, little magnetic moment) common midpoint form, wherein main receiving coil is mainly observed the field signal in late period, sub-receiving coil is observed early stage field signal, can realize effective measurement of the full degree of depth, thereby on the basis that guarantees the mid-deep strata detectivity, reduce detection blind area, improve and improve the shallow-layer Effect on Detecting.The 3rd, the transmitting coil size is greater than receiving coil, and centre stays gap, can effectively reduce self-induction and mutual inductance impact, improves signal to noise ratio (S/N ratio) and sensitivity.The 4th, adopt ARM tetra-core processor hardware platforms and be equipped with special-purpose embedded OS, can easily measurement data be carried out to real time imagery, contrast, differentiation and subsequent analysis.
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The accompanying drawing explanation
Fig. 1 is principle of the invention block diagram.
Fig. 2 is the structural representation of the embodiment of the present invention one.
Fig. 3 is receiving coil structural representation in the embodiment of the present invention two.
Fig. 4 is receiving coil structural representation in the embodiment of the present invention three.
Fig. 5 is receiving coil structural representation in the embodiment of the present invention four.
In figure, 1. main frame, 2. transmitter unit, 3. hyperchannel receiving element, 4. signal processing unit, 5. transmitting coil, 6. receiving coil (main receiving coil 61, secondary receiving coil 62, sub-receiving coil 63), 7. multiple channel communication port, 8. mining private cable, 9. communication unit.
Embodiment
The present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment mono-: as shown in Figure 1 and Figure 2, the present invention includes main frame 1, transmitter unit 2, hyperchannel receiving element 3, signal processing unit 4 and communication unit 9.Both are connected transmitter unit 2 and hyperchannel receiving element 3 with signal processing unit 4 respectively, and signal processing unit 4 is connected with main frame 1 through communication unit.Main frame 1 is for acquisition parameter and collocation channel parameter are arranged, and the data that receive are recorded, show and manage, and adopts ARM tetra-core processors, can the real-time analysis data; Main frame 1 arranges a plurality of channel communications ports 7, can synchronously receive measurement data.Transmitter unit 2 comprises multifrequency transmitter, an A/D conversion chip and the excitation power supply for powering to transmitting coil 5; Hyperchannel receiving element 3 comprises prime amplifier and the 2nd A/D conversion chip be connected with receiving coil 6; Signal processing unit 4 comprises FPGA and RAM, and FPGA, for controlling first, second A/D conversion chip and prime amplifier, is processed the information of first, second A/D conversion chip collection, and deposits the data of processing in RAM; Communication unit 9 adopts RS485 interface, network interface or USB interface, for the data by the RAM storage, through communication interface, deposits main frame 1 in.
Receiving coil be furnished with numerous embodiments, the receiving coil in this example consists of main receiving coil 61, secondary receiving coil 62 and sub-receiving coil 63, major and minor receiving coil size is identical, and the Parallel Symmetric setting, spacing is 6-12cm; Sub-receiving coil 63 is the single turn small coil, is placed in main receiving coil 61; Transmitting coil 5 is placed on outside main receiving coil 61, and transmitting coil 5, main receiving coil 61 and sub-receiving coil 63 are identical in same plane and three's central point; Wherein, transmitting coil 5 and main receiving coil 61 interval 0.1 m-0.6m, main receiving coil 61 and sub-receiving coil 63 interval 0.05 m-0.3m.
The quantity of prime amplifier and the 2nd A/D conversion chip is according to the corresponding configuration of the number of receiving coil.Configure corresponding multiple channel communication interface simultaneously.Communication interface adopts RS485 interface, network interface or USB interface.
Embodiment bis-: as shown in Figure 3, with the difference of embodiment mono-, be that the disposing way of secondary receiving coil and main and sub receiving coil is quadrature or oblique.Wherein, transmitting coil and main and sub receiving coil common midpoint, secondary receiving coil and main and sub receiving coil and transmitting coil can be total to also not common midpoint.
Embodiment tri-: as shown in Figure 4, be that with the difference of embodiment mono-receiving coil forms the double reception coil by two receiving coils that are parallel to each other, main receiving coil 61 and secondary receiving coil 62, two receiving coil areas equate and main receiving coil 61 and secondary receiving coil 62 between leave certain distance; Transmitting coil be positioned over main receiving coil 61 outsides and with its common midpoint.
Embodiment tetra-: as shown in Figure 5, be that with the difference of embodiment mono-receiving coil is comprised of the double reception coil be nested with, the double reception coil be nested with is comprised of 62 two kinds of form coils of secondary receiving coil of the main receiving coil 61 of large scale, multiturn, large magnetic moment and small size, multiturn/single turn, little magnetic moment; Transmitting coil is positioned over the periphery of large-sized main receiving coil, with the double reception coil common midpoint be nested with and coplanar.Gap between the main receiving coil of transmitting coil and the double reception coil that is nested with is 0.5m.
Embodiment five: be that with the difference of embodiment mono-transmitting coil and main and sub receiving coil be not on same plane, transmitting coil separates placement with main and sub receiving coil, but transmitting coil and major and minor, sub-receiving coil are on the same axis.
Embodiment six: with the difference of embodiment mono-, be that each ingredient of the present invention can be integrated according to actual needs, as hyperchannel receiving element, signal processing unit, communication unit and main frame are integrated together, transmitter unit, hyperchannel receiving element, signal processing unit, communication unit and main frame five can be partially integrated into together, form omnidistance total space transient electromagnetic device.
Embodiment seven: with the difference of embodiment mono-, be when transmitter unit, hyperchannel receiving element, signal processing unit, communication unit and main frame are fused together, be provided with a plurality of channel communications interfaces on main frame, its number can be three, six, eight, 12, even more, the number phase configuration of it and receiving coil.
Embodiment eight: be that with the difference of embodiment mono-each unit variation of the present invention is various informative, and form different transient electromagnetic devices, as transmitter unit and transmitting coil are placed separately; Transmitter unit and hyperchannel receiving element are combined; Also all unit can be integrated together to the formation system.
Measuring method of the present invention comprises the following steps:
(1) carrying device enters tunnel detecting area under mine;
(2) complete the connection of each assembly of instrument (main frame, collecting unit, transmitter unit and hyperchannel receiving element), and will launch receiving coil and press need of work aligning appointment anomalous body direction of measurement, press main frame and collecting unit power knob, device enters duty;
(3) by host service function software, collecting unit is arranged to correlation parameter, as sample mode, sampling time, stacking fold, sample frequency ,Ce road number etc.;
(4) after parameter sets up, press the data acquisition button on main frame, excite and set up field source one time, after primary field runs into the target geologic body, can produce the secondary field induced signal, prime amplifier amplifies induced signal, and after the A/D harvester gathers it, send into FPGA and deposit RAM in, and deposit main frame in through RS485 interface or USB interface after reading the RAM data with FPGA, by main frame, carry out data demonstration and management;
(5) if receiving coil adopts two or more coil assembly device forms, the number of passage is identical with the number of receiving coil, after receiving coil receives induced signal, the prime amplifier that each receiving coil is corresponding and A/D collecting unit are amplified and are gathered each induced signal respectively, and send into FPGA and carry out the data storage, finally by RS485 interface or USB interface, deposit main frame in, by main frame, carry out data demonstration and management.
(6) according to required angular movement receiving coil, it is positioned over to other target anomalous body position to be measured, by step (3)-(5), surveyed.
Above are only embodiments of the invention, to one skilled in the art, the present invention has multiple change and variation.Allly within invention thought of the present invention and principle, make any modification, be equal to replacement, improve etc., within all should being included in protection scope of the present invention.
Claims (11)
1. transient electromagnetic device between the omnidistance total space, it is characterized in that: comprise the transmitter unit be connected with transmitting coil and the hyperchannel receiving element be connected with receiving coil, described transmitter unit is connected with signal processing unit respectively with the hyperchannel receiving element, and described signal processing unit is connected with main frame through communication unit; Described transmitter unit comprises multifrequency transmitter, an A/D conversion chip and the excitation power supply for powering to transmitting coil; Described hyperchannel receiving element comprises prime amplifier and the 2nd A/D conversion chip be connected with at least two receiving coils; A described A/D conversion chip gathers the multifrequency transmitter current information and sends into signal processing unit processes, and described the 2nd A/D conversion chip will be sent into signal processing unit processes after prime amplifier zooms in or out signals collecting; Described signal processing unit consists of field programmable logic unit and random access memory, and described communication unit deposits main frame in for the data by described random access memory storage.
2. omnidistance total space transient electromagnetic device according to claim 1 is characterized in that: described transmitting coil is placed in described receiving coil outer periphery or top, end, is provided with the 0.1-0.6m gap therebetween.
3. omnidistance total space transient electromagnetic device according to claim 2, it is characterized in that: described receiving coil is the double reception coil consisted of main receiving coil and secondary receiving coil; Wherein major and minor receiving coil size is identical, and the Parallel Symmetric setting, and spacing is 6-12cm; Described transmitting coil is positioned over the two ends up and down top of described double reception coil and mutually vertical with the double reception coil.
4. omnidistance total space transient electromagnetic device according to claim 2, it is characterized in that: described receiving coil consists of main receiving coil and secondary receiving coil; Wherein major and minor receiving coil size is identical, and the Parallel Symmetric setting, and spacing is 6-12cm; Described main receiving coil is placed in transmitting coil and coplanar and common midpoint with it.
5. omnidistance total space transient electromagnetic device according to claim 2, it is characterized in that: described receiving coil consists of main receiving coil, secondary receiving coil and sub-receiving coil; Wherein major and minor receiving coil size is identical, and the Parallel Symmetric setting, and spacing is 6-12cm; Sub-receiving coil is the single turn small coil, is placed in main receiving coil; Described transmitting coil is placed on outside main receiving coil, and transmitting coil, main receiving coil are identical in same plane and central point with sub-receiving coil three; Wherein, transmitting coil and main receiving coil interval 0.1 m-0.6m, main receiving coil and sub-receiving coil interval 0.05 m-0.3m.
6. omnidistance total space transient electromagnetic device according to claim 2, it is characterized in that: described receiving coil consists of main receiving coil, secondary receiving coil and sub-receiving coil, and described sub-receiving coil is the single turn small coil, is placed in main receiving coil; Described transmitting coil is placed on outside main receiving coil, and transmitting coil, main receiving coil are identical in same plane and central point with sub-receiving coil three; The disposing way of described secondary receiving coil and main receiving coil and sub-receiving coil is quadrature or oblique.
7. omnidistance total space transient electromagnetic device according to claim 2, it is characterized in that: described receiving coil is nested with the double reception coil formed by main receiving coil and secondary receiving coil, described transmitting coil is positioned over the periphery that is nested with the double reception coil, and described transmitting coil is positioned at same plane with the double reception coil be nested with and both central points are identical.
8. omnidistance total space transient electromagnetic device according to claim 1, it is characterized in that: the quantity of described prime amplifier and the 2nd A/D conversion chip is according to the corresponding configuration of the number of receiving coil, and several synchronous channel communications interfaces that receive measurement data of relative set.
9. omnidistance total space transient electromagnetic device according to claim 1, is characterized in that: described main frame employing ARM tetra-core processors, real-time analysis data; Described communication unit is RS485 interface or USB interface.
10. the transient electromagnetic measuring method based on the described device of claim 1-9 any one is characterized in that: comprise the following steps:
(1) carrying device enters tunnel detecting area under mine;
(2) connection of the main frame of finishing device, collecting unit, transmitter unit and each assembly of hyperchannel receiving element, and will launch, receiving coil presses need of work and aim to specify the anomalous body direction of measurement, press main frame and collecting unit power knob, enter duty;
(3) the collecting unit correlation parameter is set;
(4) after parameter sets up, press the data acquisition button on main frame, excite and set up field source one time, after primary field runs into the target geologic body, can produce the secondary field induced signal, prime amplifier amplifies induced signal, after the 2nd A/D conversion chip gathers it, send into the field programmable logic unit and deposit random access memory in, and depositing main frame in through communication unit after reading random access memory data with the field programmable logic unit, by main frame, carrying out data demonstration and management;
(5) if receiving coil adopts two or more coil assembly device forms, the number of passage is identical with the number of receiving coil, after receiving coil receives induced signal, the prime amplifier that each receiving coil is corresponding and the 2nd A/D collector are amplified and are gathered each induced signal respectively, and send into the field programmable logic unit and carry out the data storage, finally by communication unit, deposit main frame in, by main frame, carry out data demonstration and management;
(6) according to required angular movement receiving coil, it is positioned over to other target anomalous body position to be measured, by step (3)-(5), surveyed.
11. omnidistance total space transient electromagnetic device according to claim 9 is characterized in that: in step (3), described correlation parameter is sample mode, sampling time, stacking fold, sample frequency Ce Hece road number.
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| CN104714256A (en) * | 2015-03-18 | 2015-06-17 | 安徽惠洲地质安全研究院股份有限公司 | Quick well wall and wall back nondestructive detecting system based on transient electromagnetic method and detection method of the detection system |
| CN106033128A (en) * | 2015-03-18 | 2016-10-19 | 安徽惠洲地质安全研究院股份有限公司 | Safety helmet with top board water inrush early warning function |
| CN109507739A (en) * | 2018-12-12 | 2019-03-22 | 吉林大学 | Urban underground space quick high accuracy pull-type array electromagnetic exploration apparatus and detection method |
| CN110187395A (en) * | 2019-06-24 | 2019-08-30 | 安徽理工大学 | A kind of Zero flux shallow transient electromagnetic test coil and its test method |
| CN110376653A (en) * | 2019-07-31 | 2019-10-25 | 山东大学 | Suitable for tunnel and the collapsible transient electromagnetic detection device and method on road surface |
| CN113608267A (en) * | 2021-06-08 | 2021-11-05 | 华北科技学院(中国煤矿安全技术培训中心) | Double-circuit zero-flux transient electromagnetic detection device |
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| CN113608267A (en) * | 2021-06-08 | 2021-11-05 | 华北科技学院(中国煤矿安全技术培训中心) | Double-circuit zero-flux transient electromagnetic detection device |
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| CN103499844B (en) | 2016-04-13 |
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