CN103048696A - Transmitting and receiving device of mining transient electromagnetic instrument - Google Patents
Transmitting and receiving device of mining transient electromagnetic instrument Download PDFInfo
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- CN103048696A CN103048696A CN2012105577961A CN201210557796A CN103048696A CN 103048696 A CN103048696 A CN 103048696A CN 2012105577961 A CN2012105577961 A CN 2012105577961A CN 201210557796 A CN201210557796 A CN 201210557796A CN 103048696 A CN103048696 A CN 103048696A
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Abstract
The invention discloses a transmitting and receiving device of a mining transient electromagnetic instrument. The transmitting and receiving device comprises a transmitting coil, a transmitting device, a receiving coil, a receiving device, a first receiving socket, a second receiving socket, an attenuator and a signal channel, wherein the transmitting coil is communicated with the transmitting device, two ends of the receiving coil are provided with receiving coil plugs, the first receiving socket is connected with the signal channel through the attenuator, the second receiving socket is directly connected with the signal channel, and the first receiving socket and the second receiving socket can be both independently connected with the receiving coil plugs in a matching way and can be then connected to the receiving device through the signal channel. According to the transmitting and receiving device disclosed by the invention, the geologic body information in a shallow part and a deep part can be effectively received by preventing the distortion caused by the clipping of an early-stage signal; and under the conditions without changing the wire diameter, the winding number and the like of the receiving coil, the coupling degree between the transmitting coil and the receiving coil can be reduced, the influence on a secondary field induced by the receiving coil due to the switching-off current of the transmitting coil can be lessened, and the transmitting coil needs to reach the requirement that a specified intrinsically-safe circuit is not subjected to spark ignition.
Description
Technical field
The present invention relates to the mine geophysical exploration association area, relate in particular to a kind of transmitting and receiving device of mine transient electromagnetic instrument.
Background technology
The transmitting and receiving device of mine transient electromagnetic instrument generally comprises transmitting coil, emitter, receiving coil and receiving trap, described transmitting coil is connected to emitter by the transmitting coil plug, and receiving coil is by being connected to receiving trap after receiving coil plug and signalling channel.Transmitting coil and receiving coil are generally by mining communication cable coiling, and transmitting coil connects emitter for launching transition exciting field (primary field); Receiving coil connects receiving trap for receiving geologic body vortex field (secondary field), realizes the information detection to geologic body.
Usually the received secondary field signal waveform of mine transient electromagnetic instrument, can be divided into early, middle and late three phases, and what early signal reflected is the geologic body information of shallow-layer, and what late period, signal reflected is the geologic body information in deep.The 2.5Hz bipolarity rectangle transmitter current of take is example, when transmitter current is 1-3A, the time period of early signal is at 0-600us, amplitude is generally at 1-5V, the time period in late period, receives signal and is exponential damping generally at 50-500uV at 10 – 1000 ms signals, due to early signal and late period signal 2 orders of magnitude of difference in magnitude, if dynamic range of reception channel is large not, early signal possibility clipped wave; If adopt wide dynamically, the amplifying circuit of high-gain, not only increase the research and development difficulty, also can strengthen instrument cost.Therefore how under the conditions such as dynamic range that do not change receiving cable, more effectively receiving superficial part geologic body information and geology of deep part body information, is the important problem faced at present.
In addition, the measurement mechanism of Transient Electromagnetic Apparatus, because being subject to the restriction of the environmental baseline under coal mine, adopts same point apparatus usually, with point apparatus, is divided into two types of overlapping loop line and center loop lines.When transmitting coil is identical with the receiving coil length of side, while overlapping each other, be called coincide-loop; When the receiving coil length of side is less than the transmitting coil length of side, be called the center wire-retracting device.The quality that receiving coil receives geologic body secondary field signal depends on: 1, the parameters such as the number of turn of receiving coil self, the length of side, wire diameter, inductance value, distributed capacitance, bandwidth; 2, the structure of wire-retracting device.The waveform of the exciting field of Transient Electromagnetic Apparatus is generally the bipolarity rect.p., because transmitter current turn-offs, always needs a period of time, and the turn-off time is generally in the 5-500us scope.And because the degree of coupling between the transmitting coil of overlapping loop apparatus and receiving coil is high, the cut-off current of transmitting coil will have influence on the secondary field of receiving coil induction, the secondary field early signal can produce distortion, will have influence on Transient Electromagnetic Apparatus the superficial part geologic body is surveyed.But, owing to limited by geographical conditions under coal mine, transmitting coil can not, by the very large length of side, generally all be less than 3 meters.If the center of employing wire-retracting device, the length of side of receiving coil can be less than 1 meter, and the useful area of receiving coil will reduce, and can have a strong impact on the reception signal amplitude.Although can effectively improve receiving cross section if strengthen the number of turn of receiving coil; but the inductance value of receiving coil will strengthen, can't reach the intrinsically safe circuit stipulated in GB3836.4-2010 " explosive atmosphere the 4th part: by the equipment of essential safe type " i " protection " not flashing light requirement.
In addition, the waveform of the exciting field of Transient Electromagnetic Apparatus is generally the bipolarity rect.p., due to the existence of transmitting coil self inductance, in the unlatching of transmitter current with while turn-offing, transmitting coil can produce induction electromotive force, and this induction electromotive force may be lighted by flashing in the experiment of essential safety spark.Often can't reach the intrinsically safe circuit stipulated in GB3836.4-2010 " explosive atmosphere the 4th part: by the equipment of essential safe type " i " protection " not flashing light requirement.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can, under the conditions such as dynamic range that do not change receiving cable, by avoiding the early signal clipped wave, effectively receive superficial part geologic body information; The distortion caused by ignoring the early signal slicing, only pay close attention to the signal in late period, effectively receive geology of deep part body information the transmitting and receiving device of mine transient electromagnetic instrument.
Another object of the present invention is under the conditions such as the wire diameter that does not change receiving coil, the number of turn, provide between a kind of transmitting coil and receiving coil the degree of coupling lower, the cut-off current of transmitting coil is very little on the secondary field impact of receiving coil induction, the secondary field early signal can not produce distortion, can not have influence on the transmitting and receiving device of the mine transient electromagnetic instrument that the superficial part geologic body is surveyed.
Another object of the present invention is to provide under the conditions such as the wire diameter that does not change transmitting coil, the number of turn, the length of side, and the intrinsically safe circuit that makes transmitting coil will reach regulation not flashing is lighted the transmitting and receiving device that requires mine transient electromagnetic instrument.
The present invention is achieved in that a kind of transmitting and receiving device of mine transient electromagnetic instrument, comprise transmitting coil, emitter, receiving coil and receiving trap, described transmitting coil leads to and is connected to emitter, the receiving coil two ends are provided with the receiving coil plug, it is characterized in that: also comprise the first receiver socket, the second receiver socket, attenuator and signalling channel, described the first receiver socket is connected with signalling channel by attenuator, the second receiver socket directly is connected with signalling channel, the first receiver socket, the second receiver socket all can be complementary and be connected separately with the receiving coil plug, be connected to receiving trap by signalling channel again.
When the receiving coil plug is inserted on the first receiver socket, the secondary field signal of receiving coil enters signalling channel by the first receiver socket after by attenuator, has avoided the early signal clipped wave, can effectively receive superficial part geologic body information;
When the receiving coil plug is inserted on the second receiver socket, the secondary field signal of receiving coil, by the direct entering signal passage of the second receiver socket, is ignored the distortion of early signal, only pays close attention to the signal in late period, adopt the amplifying circuit of low noise, high-gain, effectively receive ground, deep geologic body information
.
The transmitting and receiving device of described mine transient electromagnetic instrument, it is characterized in that: also comprise some fixed blocks between described transmitting coil and receiving coil, the short 30-300mm of the side ratio transmitting coil length of side of described receiving coil, described transmitting coil and receiving coil central point overlap, and are fixedly installed between transmitting coil and receiving coil and form accurate coincide-loop by fixed block.
Described fixed block is made of plastic cement or nylon, fixed block is provided with the parallel sulculus for the spacing of fixed reception coil and transmitting coil, for the spacing of fixed reception coil and transmitting coil, guarantee that transmitting coil and receiving coil central point overlap, and form accurate coincide-loop.
The transmitting and receiving device of described mine transient electromagnetic instrument, it is characterized in that: also comprise damping resistance and two Zener diodes that opposite direction is connected between described emitter and transmitting coil, the Zener diode of described damping resistance and two opposite direction series connection is connected in parallel between the two ends of coil; Described damping resistance R, when transmitter current turn-offs constantly, the stored electric energy of coil is released fast by damping resistance, prevents spark ignition; What Zener diode forward voltage drop and reverse-conducting voltage sum were less than essential safety spark experiment defined does not produce the spark ignition magnitude of voltage.
The beneficial effect that the present invention has is:
1, by two receiver sockets that are provided with, wherein between the first receiver socket and signalling channel, increase an attenuator, avoid the early signal clipped wave, can effectively receive superficial part geologic body information; The second receiver socket directly is connected with signalling channel, ignores the distortion of early signal, only pays close attention to the signal in late period, can effectively receive geology of deep part body information; As long as increase socket and attenuator, just can do corresponding detection plastid information for the different degree of depth.
2, under the conditions such as the wire diameter that does not change receiving coil, the number of turn, the side ratio transmitting coil length of side of receiving coil is short, transmitting coil and receiving coil can be not overlapping like this, between transmitting coil and receiving coil, the degree of coupling is just lower, the cut-off current of transmitting coil is very little on the secondary field impact of receiving coil induction, the secondary field early signal just can not produce distortion, just can not have influence on Transient Electromagnetic Apparatus the superficial part geologic body is surveyed; Owing to receiving just short 30-300mm of the length of side, just can guarantee that the capture area reduction is very little so need not increase the number of turn of receiving coil, amplitude impact to received signal is less, and flashing is not lighted again.
3, during the emission primary field, the waveform of electric current is the bipolarity rect.p., and current maxima can reach several amperes; Due to the existence of transmitting coil self inductance, in the unlatching of transmitter current with while turn-offing, transmitting coil can produce induction electromotive force, and this induction electromotive force may be lighted by flashing.And, at Zener diode D1, the D2 of two opposite directions of coil two terminations, what Zener diode forward voltage drop and reverse-conducting voltage sum were less than essential safety spark experiment defined does not produce the spark ignition magnitude of voltage.Open or turn-off constantly at transmitter current, if the induction electromotive force produced surpass the intrinsically safe circuit prescribed by standard do not produce the spark ignition magnitude of voltage, the Zener diode reverse-conducting, suppressed the induction electromotive force spike, prevents spark ignition.Coil two termination damping resistance R, when transmitter current turn-offs constantly, the stored electric energy of coil is released fast by damping resistance, prevents spark ignition.Therefore can realize under the conditions such as the wire diameter that does not change transmitting coil, the number of turn, the length of side, the intrinsically safe circuit that makes the transmitting coil of mine transient electromagnetic instrument to reach to stipulate in GB3836.4-2010 " explosive atmosphere the 4th part: by the equipment of essential safe type " i " protection " not flashing is lighted requirement.
The accompanying drawing explanation
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the structural representation of the transmitting and receiving device of mine transient electromagnetic instrument.
Fig. 2 is the connection diagram of essential safety holding circuit of the transmitting and receiving device of mine transient electromagnetic instrument.
Embodiment
As Fig. 1, it is the transmitting and receiving device of a kind of mine transient electromagnetic instrument of the present invention, comprise transmitting coil, emitter, receiving coil and receiving trap, described transmitting coil leads to and is connected to emitter, the receiving coil two ends are provided with the receiving coil plug, also comprise the first receiver socket 1, the second receiver socket 2, attenuator and signalling channel, described the first receiver socket 1 is connected with signalling channel by attenuator, the second receiver socket 2 directly is connected with signalling channel, the first receiver socket 1, the second receiver socket 2 all can be complementary and be connected separately with the receiving coil plug, be connected to receiving trap by signalling channel again.
When the receiving coil plug is inserted on the first receiver socket 1, the secondary field signal of receiving coil by entering signalling channel after attenuator, has been avoided the early signal clipped wave by the first receiver socket 1, can effectively receive superficial part geologic body information;
When the receiving coil plug is inserted on the second receiver socket 2, the secondary field signal of receiving coil, by the direct entering signal passage of the second receiver socket 2, is ignored the distortion of early signal, only pays close attention to the signal in late period, adopt the amplifying circuit of low noise, high-gain, effectively receive ground, deep geologic body information
.
Also comprise some fixed blocks between described transmitting coil and receiving coil, the short 30-300mm of the side ratio transmitting coil length of side of described receiving coil, described transmitting coil and receiving coil central point overlap, and are fixedly installed between transmitting coil and receiving coil and form accurate coincide-loop by fixed block.Transmitting coil is by the mine cable coiling, for launching transition exciting field (primary field); Receiving coil is by the mine cable coiling, for receiving geologic body vortex field (secondary field); Fixed block is made of plastic cement or nylon, for the spacing of fixed reception coil and transmitting coil, guarantees that transmitting coil and receiving coil central point overlap, and form accurate coincide-loop.
The present invention is under the conditions such as the wire diameter that does not change receiving coil, the number of turn, the short 30-300mm of the side ratio transmitting coil length of side of receiving coil, transmitting coil and receiving coil just can not be overlapping like this, between transmitting coil and receiving coil, the degree of coupling is just lower, the cut-off current of transmitting coil is very little on the secondary field impact of receiving coil induction, the secondary field early signal just can not produce distortion, just can not have influence on Transient Electromagnetic Apparatus the superficial part geologic body is surveyed.And owing to receiving just short 30-300mm of the length of side, just can guarantee that the capture area reduction is very little so need not increase the number of turn of receiving coil, amplitude impact to received signal is less, and flashing is not lighted again, and the intrinsically safe circuit that reaches regulation not flashing is lighted requirement.
As shown in Figure 2, be the connection diagram of the essential safety holding circuit of mine transient electromagnetic instrument transmitting coil.Also comprise damping resistance and two Zener diodes that opposite direction is connected between described emitter and transmitting coil, wherein: Lo: the transmitting coil inductance; Co: transmitting coil distributed capacitance; R: transmitting coil internal resistance; R: damping resistance; D1, D2: Zener diode.
During the emission primary field, the waveform of electric current is the bipolarity rect.p., and current maxima can reach several amperes; Due to the existence of transmitting coil self inductance, in the unlatching of transmitter current with while turn-offing, transmitting coil can produce induction electromotive force, and this induction electromotive force may be lighted by flashing.
At Zener diode D1, the D2 of two opposite directions of coil two terminations, what Zener diode forward voltage drop and reverse-conducting voltage sum were less than essential safety spark experiment defined does not produce the spark ignition magnitude of voltage.Open or turn-off constantly at transmitter current, if the induction electromotive force produced surpass the intrinsically safe circuit prescribed by standard do not produce the spark ignition magnitude of voltage, the Zener diode reverse-conducting, suppressed the induction electromotive force spike, prevents spark ignition.
At coil two termination damping resistance R, when transmitter current turn-offs constantly, the stored electric energy of coil is released fast by damping resistance, prevents spark ignition.
The Zener diode of described damping resistance and two opposite direction series connection is connected in parallel between the two ends of coil; Described damping resistance R, when transmitter current turn-offs constantly, the stored electric energy of coil is released fast by damping resistance, prevents spark ignition; What Zener diode forward voltage drop and reverse-conducting voltage sum were less than essential safety spark experiment defined does not produce the spark ignition magnitude of voltage.
Claims (4)
1. the transmitting and receiving device of a mine transient electromagnetic instrument, comprise transmitting coil, emitter, receiving coil and receiving trap, described transmitting coil leads to and is connected to emitter, the receiving coil two ends are provided with the receiving coil plug, it is characterized in that: also comprise the first receiver socket, the second receiver socket, attenuator and signalling channel, described the first receiver socket is connected with signalling channel by attenuator, the second receiver socket directly is connected with signalling channel, the first receiver socket, the second receiver socket all can be complementary and be connected separately with the receiving coil plug, be connected to receiving trap by signalling channel again.
2. the transmitting and receiving device of mine transient electromagnetic instrument according to claim 1, it is characterized in that: also comprise some fixed blocks between described transmitting coil and receiving coil, the short 30-300mm of the side ratio transmitting coil length of side of described receiving coil, described transmitting coil and receiving coil central point overlap, and are fixedly installed between transmitting coil and receiving coil and form accurate coincide-loop by fixed block.
3. the transmitting and receiving device of mine transient electromagnetic instrument according to claim 2, described fixed block is made of plastic cement or nylon, fixed block is provided with the parallel sulculus for the spacing of fixed reception coil and transmitting coil, spacing for fixed reception coil and transmitting coil, guarantee that transmitting coil and receiving coil central point overlap, and form accurate coincide-loop.
4. the transmitting and receiving device of mine transient electromagnetic instrument according to claim 1, it is characterized in that: also comprise damping resistance and two Zener diodes that opposite direction is connected between described emitter and transmitting coil, the Zener diode of described damping resistance and two opposite direction series connection is connected in parallel between the two ends of coil; Described damping resistance R, when transmitter current turn-offs constantly, the stored electric energy of coil is released fast by damping resistance, prevents spark ignition; What described Zener diode forward voltage drop and reverse-conducting voltage sum were less than essential safety spark experiment defined does not produce the spark ignition magnitude of voltage.
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| CN201210557796.1A CN103048696B (en) | 2012-12-20 | 2012-12-20 | The transmitting and receiving device of mine transient electromagnetic instrument |
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| CN201210557796.1A CN103048696B (en) | 2012-12-20 | 2012-12-20 | The transmitting and receiving device of mine transient electromagnetic instrument |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257364A (en) * | 2013-04-25 | 2013-08-21 | 福州华虹智能科技开发有限公司 | Multi-channel transient electromagnetic instrument receiving circuit |
| CN103344997A (en) * | 2013-07-09 | 2013-10-09 | 中煤科工集团西安研究院 | Mine transient electromagnetic instrument transmitting coil |
| CN103412342A (en) * | 2013-08-09 | 2013-11-27 | 中煤科工集团西安研究院 | Strong field source multichannel transmitter based on mining intrinsic safety type transient electromagnetic method |
| CN104360400A (en) * | 2014-10-23 | 2015-02-18 | 同济大学 | Ring working face electromagnetic method transmitting coil |
| CN105911600A (en) * | 2016-05-15 | 2016-08-31 | 吉林大学 | Matching circuit of tunnel transient electromagnetic coincident loop receiving coil |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7417436B2 (en) * | 2005-02-28 | 2008-08-26 | Schlumberger Technology Corporation | Selectable tap induction coil |
| CN101776770A (en) * | 2010-02-26 | 2010-07-14 | 重庆大学 | Electromagnetic prospecting sending-receiving integration method and device |
| CN201548702U (en) * | 2009-12-09 | 2010-08-11 | 福州华虹智能科技开发有限公司 | Transmitting coil and receiving coil of mining transient electromagnetic instrument |
| CN101813728A (en) * | 2009-02-23 | 2010-08-25 | 深圳易拓科技有限公司 | Electromagnetic interference detection device |
| CN201666955U (en) * | 2009-12-14 | 2010-12-08 | 福州华虹智能科技开发有限公司 | Novel mining transient electromagnetic instrument |
| CN202330740U (en) * | 2011-12-02 | 2012-07-11 | 福州华虹智能科技开发有限公司 | Mining transient electromagnetic apparatus with adjustable transmitting coils |
| CN102707321A (en) * | 2012-06-05 | 2012-10-03 | 北京工业大学 | Receiving and collecting system and method for transient electromagnetic instrument |
-
2012
- 2012-12-20 CN CN201210557796.1A patent/CN103048696B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7417436B2 (en) * | 2005-02-28 | 2008-08-26 | Schlumberger Technology Corporation | Selectable tap induction coil |
| CN101813728A (en) * | 2009-02-23 | 2010-08-25 | 深圳易拓科技有限公司 | Electromagnetic interference detection device |
| CN201548702U (en) * | 2009-12-09 | 2010-08-11 | 福州华虹智能科技开发有限公司 | Transmitting coil and receiving coil of mining transient electromagnetic instrument |
| CN201666955U (en) * | 2009-12-14 | 2010-12-08 | 福州华虹智能科技开发有限公司 | Novel mining transient electromagnetic instrument |
| CN101776770A (en) * | 2010-02-26 | 2010-07-14 | 重庆大学 | Electromagnetic prospecting sending-receiving integration method and device |
| CN202330740U (en) * | 2011-12-02 | 2012-07-11 | 福州华虹智能科技开发有限公司 | Mining transient electromagnetic apparatus with adjustable transmitting coils |
| CN102707321A (en) * | 2012-06-05 | 2012-10-03 | 北京工业大学 | Receiving and collecting system and method for transient electromagnetic instrument |
Non-Patent Citations (1)
| Title |
|---|
| 靖旭等: "电磁脉冲时域测试技术研究", 《微波学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257364A (en) * | 2013-04-25 | 2013-08-21 | 福州华虹智能科技开发有限公司 | Multi-channel transient electromagnetic instrument receiving circuit |
| CN103344997A (en) * | 2013-07-09 | 2013-10-09 | 中煤科工集团西安研究院 | Mine transient electromagnetic instrument transmitting coil |
| CN103412342A (en) * | 2013-08-09 | 2013-11-27 | 中煤科工集团西安研究院 | Strong field source multichannel transmitter based on mining intrinsic safety type transient electromagnetic method |
| CN103412342B (en) * | 2013-08-09 | 2015-12-09 | 中煤科工集团西安研究院有限公司 | Based on the high field source multichannel emitter of Mine-used I. S transient electromagnetic method |
| CN104360400A (en) * | 2014-10-23 | 2015-02-18 | 同济大学 | Ring working face electromagnetic method transmitting coil |
| CN105911600A (en) * | 2016-05-15 | 2016-08-31 | 吉林大学 | Matching circuit of tunnel transient electromagnetic coincident loop receiving coil |
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| CN103048696B (en) | 2015-09-30 |
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