CN103499844B - Omnidistance total space transient electromagnetic device and measuring method - Google Patents
Omnidistance total space transient electromagnetic device and measuring method Download PDFInfo
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Abstract
The present invention relates to omnidistance total space transient electromagnetic device and measuring method, this device comprises transmitter unit and hyperchannel receiving element, and both are connected with signal processing unit respectively, and described signal processing unit is connected with main frame through communication unit.By host service function software design patterns correlation parameter, jointly realized field source and excite by reception, transmitter unit, and completed the collection, record etc. of induced signal and excitation source signal, transfer to main frame by RS485, realize the display of data, storage and management etc.The present invention effectively can reduce self-induction and mutual inductance impact, improves signal to noise ratio (S/N ratio) and sensitivity; Receiving coil, according to detection needs, may be combined with into multi-form, obtains different Effect on Detecting, realizes the differentiation to anomalous body orientation under total space condition; Reduce detection blind area, improve and improve shallow-layer Effect on Detecting; Adopt ARM tetra-core processor hardware platform and be equipped with special embedded OS, easily measurement data can be carried out real time imagery, contrast, differentiation and subsequent analysis.
Description
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.
Background technology
As everyone knows, transient electromagnetic method is also known as TDEM (TEM), it is according to electromagnetic induction principle, earth-free coil is utilized to send an electromagnetic field to underground, at an electromagnetic field tempus intercalare, use earth-free coil to observe the method for 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 often uses multiturn coil.Particularly exploring in mine laneway, during as carried out the work such as forward probe, due to interference such as metal anchors nets in tunnel, the loop line number of turn must be increased, increase magnetic moment, to increase depth of exploration.And the increase of coil turn, also make 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 distort, and can not be used.
In principle, TEM can not only measure the geologic structure of shallow-layer, and deep geologic structure can be measured, and the ability of TEM method detection superficial part structure is carried primarily of early signal, therefore, the self-induction of coil and mutual inductance affect the early time data caused and the measurement that distortion directly affects shallow geological structure occur, and make conventional transient electromagnetic method there is a detection blind area, can reach tens meters.
And, in mine laneway, when detecting unfavorable geologic body by transient electromagnetic method, with completely different to carrying out detection under earth's surface on earth's surface.The former belongs to underground whole-space inverting, wants position and the scope of determining anomalous body, needs the combined influence considering surrounding space.Therefore, in mine laneway, when utilizing transient electromagnetic method to detect anomalous body, there is the problem how anomalous body orientation differentiated.
Summary of the invention
The object of the invention is the deficiency existed to solve above-mentioned background technology, proposing a kind ofly effectively to reduce self-induction between coil and mutual inductance each other, blind area can be reduced and transient electromagnetic device and the measuring method of total space effective location can be carried out anomalous body.
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 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 the prime amplifier and the 2nd A/D conversion chip that are connected with at least two receiving coils; A described A/D conversion chip gathers multifrequency transmitter current information and sends into signal processing unit processes, and described 2nd A/D conversion chip will zoom in or out after signals collecting through prime amplifier and send into signal processing unit processes; Described signal processing unit is made up of field programmable logic cell (hereinafter referred to as FPGA) and random access memory (hereinafter referred to as RAM), and the data that described communication unit is used for described RAM to store are stored in main frame.
Described transmitting coil is placed in above described receiving coil outer periphery or end, is provided with 0.1-0.6m gap therebetween.
Described receiving coil is the double reception coil be made up of main receiving coil and secondary receiving coil; Wherein major and minor receiving coil size is identical, and Parallel Symmetric is arranged, and spacing is 6-12cm; Mutually vertical with double reception coil above the two ends up and down that described transmitting coil is positioned over described double reception coil.
Described receiving coil is made up of main receiving coil and secondary receiving coil; Wherein major and minor receiving coil size is identical, and Parallel Symmetric is arranged, and spacing is 6-12cm; Described main receiving coil to be placed in transmitting coil and coplanar and common midpoint with it.
Described receiving coil is made up of main receiving coil, secondary receiving coil and sub-receiving coil; Wherein major and minor receiving coil size is identical, and Parallel Symmetric is arranged, and spacing is 6-12cm; Sub-receiving coil is 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 in same plane with sub-receiving coil three and central point is identical; Wherein, transmitting coil and main receiving coil interval 0.1m-0.6m, main receiving coil and sub-receiving coil interval 0.05m-0.3m.
Described receiving coil is made up of main receiving coil, secondary receiving coil and sub-receiving coil, and described sub-receiving coil is 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 in same plane with sub-receiving coil three and central point is identical; Described secondary receiving coil is orthogonal or oblique with the disposing way of main receiving coil and sub-receiving coil.
Described receiving coil is nested with by main receiving coil and secondary receiving coil and forms double reception 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 number correspondence configuration of receiving coil, and several synchronous channel communications interfaces receiving measurement data of relative set.
Described main frame adopts ARM tetra-core processor, 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 measure method of described device, comprises the following steps:
(1) carrying device enters underworkings detecting area, ore deposit;
(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 aims at by need of work and specifies anomalous body direction of measurement, press main frame and collecting unit power knob, enter duty;
(3) collecting unit correlation parameter is set;
(4) optimum configurations complete after, press the data acquisition button on main frame, excite and set up a field source, after primary field runs into target geological body, can produce secondary field induced signal, induced signal amplifies by prime amplifier, after the 2nd A/D conversion chip is gathered, send into FPGA stored in random access memory, and to read after RAM data through communication unit (RS485 interface or USB interface) stored in main frame with FPGA, carry out data display and management by main frame;
(5) if receiving coil adopts two or more coil assembly device forms, then 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 amplify each induced signal respectively and gather, and send into FPGA and carry out data storage, finally by communication unit (RS485 interface or USB interface) stored in main frame, carry out data display and management by main frame.
(6) according to required angular movement receiving coil, be positioned over the target anomalous body position that other is to be measured, detected by step (3)-(5).
In step (3), described correlation parameter is sample mode, sampling time, stacking fold, sample frequency survey and survey number of channels.
Beneficial effect of the present invention: the first, the invention provides multiple receiving cable, can receive the induced signal of multiple coil.The second, according to the difference of detection object, receiving coil may be combined with into different forms, 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 measure for detection direction to use, another receiving coil is for differentiating induced signal in the other direction, distinguishable whole-space effect, realizes the differentiation to anomalous body orientation under total space condition;
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 mainly observes field signal in late period, sub-receiving coil observes early stage field signal, effective measurement of the full degree of depth can be realized, thus on the basis ensureing mid-deep strata detectivity, reduce detection blind area, improve and improve shallow-layer Effect on Detecting.3rd, transmitting coil size is greater than receiving coil, and gap is stayed in centre, effectively can reduce self-induction and mutual inductance impact, improve signal to noise ratio (S/N ratio) and sensitivity.4th, adopt ARM tetra-core processor hardware platform and be equipped with special embedded OS, easily measurement data can be carried out real time imagery, contrast, differentiation and subsequent analysis.
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 one: 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.Transmitter unit 2 is connected with signal processing unit 4 respectively with both hyperchannel receiving elements 3, and signal processing unit 4 is connected with main frame 1 through communication unit.Main frame 1 for arranging acquisition parameter and collocation channel parameter, and records the data received, show and manages, and adopts ARM tetra-core processor, energy real-time analysis data; Main frame 1 arranges multiple channel communications port 7, synchronously can 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 the prime amplifier and the 2nd A/D conversion chip that are 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, processes the information of first, second A/D conversion chip collection, and by the data of process stored in RAM; Communication unit 9 adopts RS485 interface, network interface or USB interface, for data that RAM is stored through communication interface stored in main frame 1.
Receiving coil be furnished with numerous embodiments, the receiving coil in this example is made up of main receiving coil 61, secondary receiving coil 62 and sub-receiving coil 63, and major and minor receiving coil size is identical, and Parallel Symmetric arrange, spacing is 6-12cm; Sub-receiving coil 63 is 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 are in same plane with sub-receiving coil 63 and three's central point is identical; Wherein, transmitting coil 5 and main receiving coil 61 interval 0.1m-0.6m, main receiving coil 61 and sub-receiving coil 63 interval 0.05m-0.3m.
The quantity of prime amplifier and the 2nd A/D conversion chip is according to the number correspondence configuration of receiving coil.Configure corresponding multiple channel communication interface simultaneously.Communication interface adopts RS485 interface, network interface or USB interface.
With the difference of embodiment one, embodiment two: as shown in Figure 3, is that secondary receiving coil is orthogonal or oblique with the disposing way of main and sub receiving coil.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 can not common midpoint.
Embodiment three: as shown in Figure 4, be that receiving coil forms double reception coil by the receiving coil that two are parallel to each other with the difference of embodiment one, i.e. main receiving coil 61 and secondary receiving coil 62, two receiving coil area equation and leave certain distance between main receiving coil 61 and secondary receiving coil 62; Transmitting coil to be positioned over outside main receiving coil 61 and with its common midpoint.
Embodiment four: as shown in Figure 5, be that receiving coil is made up of the double reception coil be nested with the difference of embodiment one, the double reception coil be nested with is made up of secondary receiving coil 62 two kinds of form coils 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, coplanar with the double reception coil common midpoint be nested with.Gap between transmitting coil and the main receiving coil of double reception coil be nested with is 0.5m.
Embodiment five: be that transmitting coil and main and sub receiving coil be not in same plane with the difference of embodiment one, namely transmitting coil is separated placement with main and sub receiving coil, but transmitting coil and major and minor, sub-receiving coil are on same axis.
Embodiment six: be that each ingredient of the present invention can be integrated according to actual needs with the difference of embodiment one, as hyperchannel receiving element, signal processing unit, communication unit and main frame being integrated together, can transmitter unit, hyperchannel receiving element, signal processing unit, communication unit and main frame five be partially integrated into together, form omnidistance total space transient electromagnetic device.
Embodiment seven: be when transmitter unit, hyperchannel receiving element, signal processing unit, communication unit and main frame are fused together with the difference of embodiment one, main frame is provided with multiple channel communications interface, its number can be three, six, eight, 12, even more, the number phase configuration of it and receiving coil.
Embodiment eight: be that each unit variation of the present invention is various informative with the difference of embodiment one, and form different transient electromagnetic device, as transmitter unit and transmitting coil are placed separately; Transmitter unit and hyperchannel receiving element are combined; Also all unit can be integrated together formation system.
Measuring method of the present invention, comprises the following steps:
(1) carrying device enters underworkings detecting area, ore deposit;
(2) connection of each assembly of instrument (main frame, collecting unit, transmitter unit and hyperchannel receiving element) is completed, and launch and accept coil is pressed 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, correlation parameter is arranged to collecting unit, as sample mode, sampling time, stacking fold, sample frequency, survey number of channels etc.;
(4) optimum configurations complete after, press the data acquisition button on main frame, excite and set up a field source, after primary field runs into target geological body, can produce secondary field induced signal, induced signal amplifies by prime amplifier, and after A/D harvester gathered, send into FPGA stored in RAM, and to read after RAM data through RS485 interface or USB interface stored in main frame with FPGA, carry out data display and management by main frame;
(5) if receiving coil adopts two or more coil assembly device forms, then 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 amplify each induced signal respectively and gather, and send into FPGA and carry out data storage, finally by RS485 interface or USB interface stored in main frame, carry out data display and management by main frame.
(6) according to required angular movement receiving coil, be positioned over the target anomalous body position that other is to be measured, detected by step (3)-(5).
Above are only embodiments of the invention, to one skilled in the art, the present invention has multiple change and change.Allly within invention thought of the present invention and principle, make any amendment, equivalently to replace, improve, all should be included within protection scope of the present invention.
Claims (11)
1. omnidistance total space transient electromagnetic device, 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 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 the prime amplifier and the 2nd A/D conversion chip that are connected with at least two receiving coils; A described A/D conversion chip gathers multifrequency transmitter current information and sends into signal processing unit processes, and described 2nd A/D conversion chip will zoom in or out after signals collecting through prime amplifier and send into signal processing unit processes; Described signal processing unit is made up of field programmable logic cell and random access memory, and the data that described communication unit is used for described random access memory to store are stored in main frame; Described receiving coil or be made up of main receiving coil, secondary receiving coil, or be made up of main receiving coil, secondary receiving coil and sub-receiving coil; Wherein major and minor receiving coil size is identical, and Parallel Symmetric is arranged, and spacing is 6-12cm; Sub-receiving coil is single turn small coil, is placed in main receiving coil; Described transmitting coil or be placed on outside main receiving coil, transmitting coil, main receiving coil are in same plane with sub-receiving coil three and central point is identical, or mutually vertical with major and minor receiving coil above the two ends being up and down positioned over described major and minor receiving coil.
2. omnidistance total space transient electromagnetic device according to claim 1, is characterized in that: be provided with 0.1-0.6m gap between described transmitting coil and main receiving coil.
3. omnidistance total space transient electromagnetic device according to claim 2, is characterized in that: described receiving coil is the double reception coil be made up of main receiving coil and secondary receiving coil; Wherein major and minor receiving coil size is identical, and Parallel Symmetric is arranged, and spacing is 6-12cm; Mutually vertical with double reception coil above the two ends up and down that described transmitting coil is positioned over described double reception coil.
4. omnidistance total space transient electromagnetic device according to claim 2, is characterized in that: described receiving coil is made up of main receiving coil and secondary receiving coil; Wherein major and minor receiving coil size is identical, and Parallel Symmetric is arranged, and spacing is 6-12cm; Described main receiving coil to be placed in transmitting coil and coplanar and common midpoint with it.
5. omnidistance total space transient electromagnetic device according to claim 2, is characterized in that: described receiving coil is made up of main receiving coil, secondary receiving coil and sub-receiving coil; Wherein major and minor receiving coil size is identical, and Parallel Symmetric is arranged, and spacing is 6-12cm; Sub-receiving coil is 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 in same plane with sub-receiving coil three and central point is identical; Wherein, transmitting coil and main receiving coil interval 0.1m-0.6m, main receiving coil and sub-receiving coil interval 0.05m-0.3m.
6. omnidistance total space transient electromagnetic device according to claim 2, it is characterized in that: described receiving coil is made up of main receiving coil, secondary receiving coil and sub-receiving coil, described sub-receiving coil is 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 in same plane with sub-receiving coil three and central point is identical; Described secondary receiving coil is orthogonal or oblique with the disposing way of main receiving coil and sub-receiving coil.
7. omnidistance total space transient electromagnetic device according to claim 2, it is characterized in that: described receiving coil is nested with by main receiving coil and secondary receiving coil the double reception coil formed, described transmitting coil is positioned over the periphery being nested with 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 number correspondence configuration of receiving coil, and several synchronous channel communications interfaces receiving measurement data of relative set.
9. omnidistance total space transient electromagnetic device according to claim 1, is characterized in that: described main frame adopts ARM tetra-core processor, real-time analysis data; Described communication unit is RS485 interface or USB interface.
10., based on the Transient electromagnetic measure method of device described in any one of claim 1-9, it is characterized in that: comprise the following steps:
(1) carrying device enters underworkings detecting area, ore deposit;
(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 aims at by need of work and specifies anomalous body direction of measurement, press main frame and collecting unit power knob, enter duty;
(3) collecting unit correlation parameter is set;
(4) optimum configurations complete after, press the data acquisition button on main frame, excite and set up a field source, after primary field runs into target geological body, can produce secondary field induced signal, induced signal amplifies by prime amplifier, after the 2nd A/D conversion chip is gathered, send into field programmable logic cell stored in random access memory, and to read after random access memory data through communication unit stored in main frame with field programmable logic cell, carry out data display and management by main frame;
(5) if receiving coil adopts two or more coil assembly device forms, then 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 amplify each induced signal respectively and gather, and send into field programmable logic cell and carry out data storage, finally by communication unit stored in main frame, carry out data display and management by main frame;
(6) according to required angular movement receiving coil, be positioned over the target anomalous body position that other is to be measured, detected by step (3)-(5).
11. Transient electromagnetic measure methods according to claim 10, is characterized in that: in step (3), and described correlation parameter is sample mode, sampling time, stacking fold, sample frequency survey and survey number of channels.
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| CN106033128B (en) * | 2015-03-18 | 2018-07-10 | 安徽惠洲地质安全研究院股份有限公司 | A kind of safety cap with roof water inrush warning function |
| 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 |
| CN109507739B (en) * | 2018-12-12 | 2019-10-01 | 吉林大学 | Urban underground space quick high accuracy pull-type array electromagnetic exploration apparatus and detection method |
| CN110187395B (en) * | 2019-06-24 | 2020-12-01 | 安徽理工大学 | Zero-magnetic-flux shallow transient electromagnetic test coil and test method thereof |
| CN110376653B (en) * | 2019-07-31 | 2021-02-23 | 山东大学 | Folding type transient electromagnetic detection device and method suitable for tunnel and 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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Address after: 230601, No. 41 Tang Tao Road, peach blossom Industrial Park, Hefei economic and Technological Development Zone, Anhui Applicant after: ANHUI HUIZHOU GEOLOGY SECURITY INSTITUTE CO., LTD. Address before: 230601, No. 41 Tang Tao Road, peach blossom Industrial Park, Hefei economic and Technological Development Zone, Anhui Applicant before: Anhui Huizhou Institute of Subterranean Calamity |
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