CN100454040C - Shallow sea transient electromagnetic detection emitter - Google Patents
Shallow sea transient electromagnetic detection emitter Download PDFInfo
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- CN100454040C CN100454040C CNB2005100172850A CN200510017285A CN100454040C CN 100454040 C CN100454040 C CN 100454040C CN B2005100172850 A CNB2005100172850 A CN B2005100172850A CN 200510017285 A CN200510017285 A CN 200510017285A CN 100454040 C CN100454040 C CN 100454040C
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Abstract
The present invention discloses a sea transient electromagnetic detection transmitter. The present invention is composed of an upper computer and a lower computer, wherein the upper computer uses a PC or a notebook computer as a control terminal to complete control and monitoring to a lower computer system, and the lower computer is composed of a main control unit, a driving protection unit, a bridge unit and a current recording unit. A transmitter can transmit three kinds of rectangular waves with adjustable frequencies, current waveforms can be selected to be output in practical detection, and the frequency range is from 1.25Hz to 2.5K and can be adjusted. Telemonitoring to a transmission system can be realized, and emission currents which can satisfy the requirements of transient electromagnetic detection of sea can be output. Meanwhile, the volume of devices can be reduced greatly, the transmitter has small volume (20cm*16cm*14cm), weight is 0.25Kg, actual emission currents are greater than 70A, and pure resistive load turn-off time is less than 3 us. The present invention is suitable for the requirements of transient electromagnetic detection of shallow seafloors.
Description
Technical field:
The present invention relates to a kind of geophysical survey instrument, or shallow sea transient electromagnetic surveying magnetic source emitter especially under water.
Background technology:
The surface 3/4ths of the earth is covered by the ocean, the seabed resource that is richly stored with, and seismic survey is a main method of seeking seabed resources, but runs into areas such as carbonic acid cay, volcano laccolith, and seismic method lost efficacy, and Marine Electromagnetic Approach just becomes a kind of important method.On the beach, the shallow sea, seabed electromagnetic surveying technology can also be used to solving problems such as oceanographic engineering.In the electromagnetic method of seabed, telluric electromagnetic sounding research is more deep, but its field source intensity is uncontrollable, and natural field source has the shortcoming of weak output signal and randomness, the advantage of employing controllable source electromagnetic method just is the controllability of its emission field source, frequency and controllable waveform by the transmitter transmission, the investigation depth that reaches can be adjusted, remedied the deficiency on investigation depth between natural telluric electromagnetic sounding and boring and the dc resistivity, the form of field source-reception and distance can be controlled in addition, so can be at the character of target and the suitable working method of selection that distributes.It mainly is one-point measurement that transient electromagnetic detecting is carried out in the land, the towing metering system has been adopted in the aviation geophysical method, only be subjected to the relatively good control of influence of atmosphere and wind aloft, particularly in the ocean, carry out can not be as the on land stable one-point measurement of transient electromagnetic detecting under water, because seawater moves, the uncertain direction of seabed ocean current particularly, therefore in marine environment, just can not as the land, make things convenient for free, but the mode that can adopt towing to measure as the aviation geophysical method is carried out, this just requires the marine transient electromagnetic surveying to realize the remote monitoring detection on the operation ship, the existing electromagnetic method transmitter that uses on land adopts controllable silicon bridge-type output circuit, operation is by the keyboard on the instrument panel with by key control.Adopt this mode, the overall volume and the weight of transmitter are big on the one hand, are difficult to be adapted at underwater sealing, on the other hand because the controllable silicon turn-off characteristic has determined the turn-off time to be difficult to be difficult to carry out transient electromagnetic detecting less than 50 μ s in the ocean.
Summary of the invention:
Purpose of the present invention just is at the deficiencies in the prior art, provides a kind of volume little and light, can turn-off fast, realizes the monitoring to transmitter and the shallow sea transient electromagnetic detection emitter of suitable underwater towing with the Long-distance Control mode.
The objective of the invention is to realize in the following manner: slave computer 3 is 1. 2. to be connected with the driving protected location through WA/WB by main control unit, driving protected location 3. 2. is connected with emission bridge circuit unit through WWA/WWB, 4. 3. emission bridge circuit unit be connected with the electric current record cell through Ain, and 3. 1. main control unit connect to form with emission bridge circuit unit through TB;
1. a, main control unit comprise: microprocessor 8 passes through PA[0..7] with PB[0..1] be connected liquid crystal control module 4 and LCDs, pass through PB[2..3] connection waveform synthesis module 5 and driving/synchronizing signal, pass through PA[0..7] connect data memory module 6, be connected 485 buses through serial bus TXD/RXD with 485 communication modules 7;
2. b, driving protected location are connected with driving circuit 10 by the WWA/WWB of driving/synchronizing signal through light-coupled isolation 9,3. the fast breaking circuit 13 of negative bias connects the bridge circuit unit through [0..3], bridge circuit protection module 12 connects driving circuit 10 through Asd, connect the bridge circuit unit 3. through Ain, 1. the overcurrent-overvoltage status information sends into main control unit through light-coupled isolation 9, and driving power module 11 provides power supply for driving circuit 10 and the fast breaking circuit 13 of negative bias;
3. c, bridge circuit unit are connected buffering by emission power 14 by BAT and absorb circuit 16 with bridge circuit power output unit 15, bridge circuit power output unit 15 is connected sample circuit 17 by COLL with transmitting coil 18, and 4. 2. sample circuit 17 be connected with the electric current record cell with the driving protected location respectively through Ain;
4. d, electric current record cell comprise: synchronous sequence control circuit 19 connects microprocessor 21 through PB0,485 communication modules 7 connect microprocessor 21 by serial bus TXD/RXD, microprocessor 21 is through PA[0..7] connection buffer unit 22 and high-speed AD 23, and receive the signal that sample circuit is sent into through preposition amplification filtering circuit 25, microprocessor 21 is through PB[1.3] connect and gather time sequence control logic 24, and signal sent into buffer unit 22 and high-speed AD 23, and microprocessor 21 is through PA[0..7] connect data temporary storage location 26 and constitute.
Good effect: the present invention adopts the time domain electromagnetic method, transmitter can three kinds of adjustable square waves of transmission frequency, in actual detection, can select output current wave, its frequency range is that 1.25Hz is adjustable to 2.5K, adopts bridge type inverse to turn-off technology soon, the little (20cm * 16cm * 14cm) of transmitter volume, weight is 0.25Kg (not subsidiary emission power), the actual transmission electric current is greater than 70A, and the pure following turn-off time of resistive load is suitable for the shallow sea transient electromagnetic surveying of underwater towing less than 3us.
Accompanying drawing and description of drawings:
Accompanying drawing 2 is main control unit block diagrams 1. in the slave computer 3 in the accompanying drawing 1
Accompanying drawing 3 is to drive protected location block diagram 2. in the accompanying drawing 1 in the slave computer 3
Accompanying drawing 4 is to launch bridge circuit unit block diagram 3. in the accompanying drawing 1 in the slave computer 3
Accompanying drawing 5 is electric current record cell block diagrams 4. in the slave computer 3 in the accompanying drawing 1
1. main control unit, 2. drive protected location, 3. bridge circuit unit, 4. electric current record cell
1 host computer, 2485 buses, 3 slave computers; 4 Liquid Crystal Modules, 5 waveform synthesis modules, 6 data memory modules; 7485 communication modules, 8 microprocessors, 9 light-coupled isolations; 10 driving circuits, 11 driving power modules, 12 bridge circuit protection modules; the fast breaking circuit of 13 negative biass, 14 emission powers, 15 bridge circuit power output units; 16 bufferings absorb circuit; 17 sample circuits, 18 transmitting coils, 19 synchronous sequence control circuits; 21 microprocessors; 22 buffer units, 23 high-speed AD, 24 gather time sequence control logic; 25 preposition amplification filtering circuit, 26 data temporary storage locations.
Embodiment:
Below in conjunction with accompanying drawing the present invention is described in further detail: shallow sea transient electromagnetic detection emitter is to be made of host computer 1 and slave computer 3 two parts, host computer 1 can be a desk-top computer, also can be notebook computer, as the control terminal of shallow sea transient electromagnetic detection emitter.Slave computer 3 is an emission coefficient, be in the underwater sealing body, whole emission coefficient adopts 485 bus mode communications, microprocessor 8 links to each other with 485 communication modules 7 by serial port, microprocessor 21 links to each other with 485 communication modules 7 by serial port, the serial port of microprocessor 8 and microprocessor 21 and RS485 level conversion adopt the SN75176 chip, realized host computer 1 and main control unit 1. with the communication 4. of electric current record cell, realized the real-time monitoring of 1 pair of slave computer 3 of host computer.
1. main control unit comprises: microprocessor 8 passes through PA[0..7] with PB[0..1] be connected liquid crystal control module 4 and LCDs, pass through PB[2..3] connection waveform synthesis module 5 and driving/synchronizing signal, pass through PA[0..7] connect data memory module 6, be connected 485 buses through serial bus TXD/RXD with 485 communication modules 7;
Driving protected location 2. is connected with driving circuit 10 by the WWA/WWB of driving/synchronizing signal through light-coupled isolation 9,3. the fast breaking circuit 13 of negative bias connects the bridge circuit unit through [0..3], bridge circuit protection module 12 connects driving circuit 10 through Asd, connect the bridge circuit unit 3. through Ain, 1. the overcurrent-overvoltage status information sends into main control unit through light-coupled isolation 9, and driving power module 11 provides power supply for driving circuit 10 and the fast breaking circuit 13 of negative bias;
3. the bridge circuit unit is connected buffering by emission power 14 by BAT and absorbs circuit 16 with bridge circuit power output unit 15, bridge circuit power output unit 15 is connected sample circuit 17 by COLL with transmitting coil 18, and 4. 2. sample circuit 17 be connected with the electric current record cell with the driving protected location respectively through Ain;
4. the electric current record cell comprises: synchronous sequence control circuit 19 connects microprocessor 21 through PB0,485 communication modules 7 connect microprocessor 21 by serial bus TXD/RXD, microprocessor 21 is through PA[0..7] connection buffer unit 22 and high-speed AD 23, and receive the signal that sample circuit is sent into through preposition amplification filtering circuit 25, microprocessor 21 is through PB[1.3] connect and gather time sequence control logic 24, and signal sent into buffer unit 22 and high-speed AD 23, and microprocessor 21 is through PA[0..7] connect data temporary storage location 26 and constitute.
1. main control unit receives the instruction of host computer 1,1. main control unit adopts the AT90S8515L microprocessor 8 of ATMEL as master controller, emission mode and transmission frequency are provided with, show by main control unit Liquid Crystal Module 4 1. simultaneously, so that debugging and system diagnostics.By being provided with of waveform synthesis module 5 realized different emission modes and frequency, provide to drive and synchronizing signal output, systematic parameter and deal with data are kept in the data memory module 6.For the interference between each module of inhibition system, main control unit 1. and drive protected location 2., the bridge circuit unit 3., the electric current record cell designed light-coupled isolation 9 between 4., to reduce the influence of high-power output module to control section security and stability; Driving after the isolation and synchronizing signal provide quick by IR2110S driving circuit 10 and the fast breaking circuit 13 of negative bias for bridge circuit power output unit 15 and have the drive signal of negative bias, to quicken the rapid and reliable shutoff of MOSFET in the bridge circuit.Absorb circuit 16 for suppressing to turn-off surge voltage and overshoot, adopt to discharge and recharge type RCD buffering, reduce the switching loss of device, suppress electromagnetic interference (EMI), improve the reliability of circuit.For over-current phenomenon avoidance appears in anti-locking system in the course of the work; thereby cause the badly damaged of system; design bridge circuit protection module 12 in the system and realized over-current over-voltage protection; if overcurrent or overpressure situation; turn-off by IR2110S driving circuit 10 and to drive output and realize protection, simultaneously 1. and convey to host computer 1 by light-coupled isolation 9 notice main control units.Driving circuit 10 adopts the acp chip of IR2110S chip as driving circuit, with the IRF3205 chip as on-off element, form H bridge alternate conduction under the driving of IR2110S chip, convert direct current to pulse signal, form the transient electrical probing by coil and survey magnetic source.The current power signal is by transmitting coil 18 outputs; sample circuit 17 adopts series connection sample resistance mode that transmitter current is taken a sample simultaneously; for 4. bridge circuit protection module 12 and electric current record cell provide current sampling signal; monitor the duty of emission coefficient in real time, for the influence of rejecting primary field and coil transient process in the data handling procedure provides the waveform recording of transmitter current negative edge.
4. the electric current record cell carries out high speed acquisition to current signal, send into high-speed AD LTC141223 behind current signal process sample circuit 17 and the preposition amplification filtering circuit 25 and after finishing high speed analog-to-digital conversion under the control of gathering time sequence control logic 24, squeeze into cache element 22, deposit data temporary storage location 26 in through microprocessor 21 reading of data and after finishing data processing then.Whole gatherer process is a core with microprocessor 21, assisting down of synchronous sequence control circuit 19, gathers the shutoff of transmitter current waveform exactly along signal by gathering time sequence control logic 24.Electric current file, transmitter state and negative edge current waveform recorded information send host computer 1 to by 485 communication modules 20, so that the real-time demonstration of host computer 1, realize in the towing process the real-time monitoring to transmitter state under the sea.
Claims (1)
1, a kind of shallow sea transient electromagnetic detection emitter that is mainly used in the ocean or carries out geophysical survey under water, be to constitute by 485 buses (2) and slave computer (3) and terminal impedance coupling by host computer (1), it is characterized in that: slave computer (3) is 1. 2. to be connected with the driving protected location through WA/WB by main control unit, driving protected location 3. 2. is connected with emission bridge circuit unit through WWA/WWB, 4. 3. emission bridge circuit unit be connected with the electric current record cell through Ain, and 3. 1. main control unit connect to form with emission bridge circuit unit through TB;
1. a, main control unit comprise: microprocessor (8) passes through PA[0..7] with PB[0..1] be connected liquid crystal control module (4) and LCDs, pass through PB[2..3] connection waveform synthesis module (5) and driving/synchronizing signal, pass through PA[0..7] connect data memory module (6), be connected 485 buses through serial bus TXD/RXD with 485 communication modules (7);
2. b, driving protected location are connected with driving circuit (10) by the WWA/WWB of driving/synchronizing signal through light-coupled isolation (9), 3. the fast breaking circuit of negative bias (13) connects the bridge circuit unit through [0..3], bridge circuit protection module (12) connects driving circuit (10) through Asd, connect the bridge circuit unit 3. through Ain, 1. the overcurrent-overvoltage status information sends into main control unit through light-coupled isolation (9), and driving power module (11) provides power supply for driving circuit (10) and the fast breaking circuit of negative bias (13);
3. c, bridge circuit unit are connected buffering by emission power (14) by BAT and absorb circuit (16) with bridge circuit power output unit (15), bridge circuit power output unit (15) is connected sample circuit (17) by COLL with transmitting coil (18), and 4. sample circuit (17) 2. is connected with the electric current record cell with the driving protected location respectively through Ain;
D, 4. the electric current record cell comprises: synchronous sequence control circuit (19) connects microprocessor (21) through PB0,485 communication modules (7) connect microprocessor (21) by serial bus TXD/RXD, microprocessor (21) is through PA[0..7] connection buffer unit (22) and high-speed AD (23), and receive the signal that sample circuit is sent into through preposition amplification filtering circuit (25), microprocessor (21) is through PB[1.3] connect and gather time sequence control logic (24), and signal sent into buffer unit (22) and high-speed AD (23), and microprocessor (21) is through PA[0..7] connect data temporary storage locations (26) and constitute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100172850A CN100454040C (en) | 2005-11-14 | 2005-11-14 | Shallow sea transient electromagnetic detection emitter |
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| CNB2005100172850A CN100454040C (en) | 2005-11-14 | 2005-11-14 | Shallow sea transient electromagnetic detection emitter |
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| CN1773311A CN1773311A (en) | 2006-05-17 |
| CN100454040C true CN100454040C (en) | 2009-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571600B (en) * | 2009-03-16 | 2011-02-16 | 山东大学 | Integral transient electromagnetism advanced prediction measuring device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253418B (en) * | 2011-04-01 | 2013-05-01 | 中国地质大学（北京） | Marine controlled-source electromagnetic transmission system and using method thereof |
| CN102353995A (en) * | 2011-09-29 | 2012-02-15 | 北京先驱高技术开发公司 | Deep-sea transient electromagnetic surveying device and method thereof |
| CN103308950A (en) * | 2013-05-22 | 2013-09-18 | 中国地质大学（武汉） | Multifunctional electromagnetic emission instrument |
| CN103454692A (en) * | 2013-09-05 | 2013-12-18 | 中煤科工集团西安研究院 | Intrinsic safety type transient electromagnetic instrument host for mines |
| CN103701354B (en) * | 2013-12-28 | 2015-12-30 | 吉林大学 | There is grounded source transmitter installation and the control method of self adaptation dummy load |
| CN111290026A (en) * | 2020-03-31 | 2020-06-16 | 湖南科技大学 | Electrical prospecting signal sending device and method for suppressing electromagnetic coupling interference |
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| GB2385923A (en) * | 2002-05-24 | 2003-09-03 | Statoil Asa | Method for electromagnetic wavefield resolution |
| WO2004053528A1 (en) * | 2002-12-10 | 2004-06-24 | The Regents Of The University Of California | System and method for hydrocarbon reservoir monitoring using controlled-source electromagnetic fields |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2794532A1 (en) * | 1999-06-02 | 2000-12-08 | Commissariat Energie Atomique | METHOD FOR ELECTROMAGNETIC DETECTION OF CONDUCTIVE OBJECTS |
| CN1406340A (en) * | 2000-02-02 | 2003-03-26 | 斯塔特石油公开有限公司 | Method and apparatus for determining the nature of subterranean reservoirs |
| GB2385923A (en) * | 2002-05-24 | 2003-09-03 | Statoil Asa | Method for electromagnetic wavefield resolution |
| WO2004053528A1 (en) * | 2002-12-10 | 2004-06-24 | The Regents Of The University Of California | System and method for hydrocarbon reservoir monitoring using controlled-source electromagnetic fields |
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| CN101571600B (en) * | 2009-03-16 | 2011-02-16 | 山东大学 | Integral transient electromagnetism advanced prediction measuring device |
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