CN102749655A - Method for removing electromagnetic interference (EMI) signal by transient electromagnetic instrument background field guidance frequency-selecting technology - Google Patents
Method for removing electromagnetic interference (EMI) signal by transient electromagnetic instrument background field guidance frequency-selecting technology Download PDFInfo
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- CN102749655A CN102749655A CN2012102151914A CN201210215191A CN102749655A CN 102749655 A CN102749655 A CN 102749655A CN 2012102151914 A CN2012102151914 A CN 2012102151914A CN 201210215191 A CN201210215191 A CN 201210215191A CN 102749655 A CN102749655 A CN 102749655A
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Abstract
The invention provides a method for removing an electromagnetic interference (EMI) signal by a coal mine underground transient electromagnetic instrument background field guidance frequency-selecting technology; a coal mine underground transient electromagnetic instrument adopted in the method comprises a receiver consisting of a central processing unit (CPU), a memory, an analog/ digital converter (ADC), a receiving circuit and a receiving coil, and a transmitter consisting of a transmission circuit and a transmitting coil; and the receiver is connected with the transmitter by a communication cable for realizing synchronous control. According to the method, a spectrum analysis method is firstly used for analyzing the frequency of the maximum amplitude of the EMI signal of the background field, and then the frequency transmitted by the transient electromagnetic instrument is guided according to the measured frequency of the maximum amplitude of the EMI signal of the background field, so that the EMI can be rapidly and accurately eliminated, accurate observed value of the secondary field can be obtained, and the aim of accurately eliminating the EMI signal can be achieved.
Description
Technical field
The present invention relates to a kind of geophysical survey field, specifically, relate to the method for Transient Electromagnetic Apparatus removal electromagnetic interference signal under a kind of coal mine.
Background technology
Transient electromagnetic method (TEM) is the very wide new method of exploration of a kind of application prospect in the geophysical exploration field, and successfully has been applied to colliery, metallic ore, oil, coal gas at present and the engineering sounding aspect such as reconnoitres.
But under normal conditions, the Transient electromagnetic response in geologic body deep can be submerged in the noise, and what pay close attention to most in the transient electromagnetic detecting method is exactly the useful signal that how to obtain the deep.In transient electromagnetic method, undesired signal mainly is natural electromagnetic field noise and humane interference etc., is called ambient field again.Under coal mine, the ambient field during owing to the electrical equipment running can the serious detection of disturbing Transient Electromagnetic Apparatus.In order to suppress to disturb; Existing transient electromagnetic all adopts bi-directional pulse current as driving source (primary field); Gather secondary field and ambient field at the tempus intercalare of positive and negative pulse, the secondary field and the ambient field of positive pulse tempus intercalare collection deducted secondary field and the ambient field that the negative pulse tempus intercalare is gathered, if the frequency of launching just in time is the even-multiple more than 1/2 of ambient field undesired signal frequency; The secondary field signal that geologic body produces is applied, and the ambient field undesired signal is cancelled.
But if the frequency of emission is not the even-multiple more than 1/2 of ambient field undesired signal frequency, bipolarity stack rear backdrop field undesired signal is not only offset, and can strengthen on the contrary.Therefore, be that Transient Electromagnetic Apparatus effectively suppresses the key technology disturbed how based on ambient field guidance tranmitting frequency.
Summary of the invention
The object of the invention provides the method for the removal electromagnetic interference signal of Transient Electromagnetic Apparatus under a kind of coal mine with ambient field guidance frequency-selecting technology.
Transient Electromagnetic Apparatus comprises under the coal mine that method of the present invention adopted: receiver is by being made up of CPU, storer, ADC, receiving circuit and receiving coil; Transmitter is that radiating circuit and transmitting coil are formed; Connect with communication cable between the Receiver And Transmitter, to realize synchro control.
Transient Electromagnetic Apparatus ambient field guidance frequency-selecting technology is removed the method for electromagnetic interference signal under a kind of coal mine provided by the invention, it is characterized in that comprising the steps:
A, do not launch primary field, receive pure ambient field signal, go out the maximum interfering frequency of peak-to-peak value in the ambient field signal with the methods analyst of spectrum analysis with receiving circuit
f Max
B, the maximum ambient field undesired signal frequency that obtains according to spectrum analysis
f Max , with the Transient Electromagnetic Apparatus transmission frequency
f 0 Guidance is:
f 0 =
f Max / (2*n), n=1 wherein, 2,4,8 Wherein preferred scheme is:
f 0 =
f Max / 2 or
f 0 =
f Max / 4 or
f 0 =
f Max / 8;
The receiver of c, said Transient Electromagnetic Apparatus is controlled radiating circuit with transmission frequency through the synchro control cable
f 0 Carry the positive polarity electric current to transmitting coil, make transmitting coil produce the positive polarity primary field; Receiver turn-offs transmitting coil positive polarity electric current fast through the synchro control cable, makes the inductive loop that geologic body has encouraged under the coal mine will produce time dependent positive polarity secondary field;
D, receiver are in the quiescent interval territory that primary field is closed; Regularly receive geologic body positive polarity secondary field under the coal mine continuously through receiving coil and receiving circuit; Obtain the signal of timing positive polarity secondary field continuously, receiving coil receives ambient field undesired signal frequency simultaneously
f Max
E, in like manner, the receiver of said Transient Electromagnetic Apparatus control radiating circuit is with transmission frequency
f 0 Carry the negative polarity electric current to transmitting coil, make transmitting coil produce the negative polarity primary field; Receiver turn-offs transmitting coil positive polarity electric current fast through the synchro control cable, makes the inductive loop that geologic body has encouraged under the coal mine will produce time dependent negative polarity secondary field;
F, receiver regularly receive geologic body negative polarity secondary field under the coal mine through receiving coil and receiving circuit continuously in the quiescent interval territory that primary field is closed, obtain the signal of negative polarity secondary field, and receiving coil receives ambient field undesired signal frequency simultaneously
f Max
Transient Electromagnetic Apparatus ambient field guidance frequency-selecting technology is removed the method for electromagnetic interference signal under the described coal mine, can also further be specially:
Can also comprise the steps:
G, repeat above-mentioned some cycles of c-f step, obtaining some cycles contains ambient field undesired signal frequency
f Max Positive polarity secondary field signal and negative polarity secondary field signal;
H, with the negative value signal on the occasion of signal Reduction of Students' Study Load polarity secondary field of positive polarity secondary field.
Because existing transient electromagnetic all adopts bi-directional pulse current as driving source (primary field); Tempus intercalare in positive and negative pulse is gathered secondary field and ambient field; The secondary field and the ambient field of the collection of positive pulse tempus intercalare are deducted secondary field and the ambient field that the negative pulse tempus intercalare is gathered; If the frequency of emission just in time is the even-multiple more than 1/2 of ambient field undesired signal frequency, the secondary field signal that geologic body produces is applied, and the ambient field undesired signal is cancelled; But if the frequency of emission is not the even-multiple more than 1/2 of ambient field undesired signal frequency, bipolarity stack rear backdrop field undesired signal is not only offset, and strengthens on the contrary.And adopt method of the present invention, go out the frequency of ambient field undesired signal peak swing earlier with the methods analyst of spectrum analysis
f Max , again according to ambient field with the Transient Electromagnetic Apparatus transmission frequency
f 0 Guidance does
f 0 =
f Max / 2 or
f 0 =
f Max / 4 or
f 0 =
f Max / 8, just can suppress the interference of the different frequency of different background field generation effectively.
Description of drawings
Combine embodiment that the present invention is further described with reference to the accompanying drawings.
Fig. 1 is a Transient Electromagnetic Apparatus synoptic diagram under the coal mine.
Embodiment
The method that at present combines accompanying drawing that Transient Electromagnetic Apparatus ambient field guidance frequency-selecting technology under the coal mine according to the invention is removed electromagnetic interference signal is done further elaboration:
See also Fig. 1; Transient Electromagnetic Apparatus comprises the transmitter 19 that radiating circuit 15 and transmitting coil 18 are formed under the coal mine that is adopted in the method for the present invention; The receiver 13 of receiving circuit 9 and receiving coil 14 compositions, receiver 13 is realized synchro control with transmitter 19 usefulness cables 20.Said transmitting coil 18 is earth-free loop with receiving coil 14, overlaps on the geologic body under the coal mine (coal seam or country rock), and transmitting coil 18 is received respectively on radiating circuit 15 and the receiving circuit 9 with receiving coil 14.
When starting working, do not launch primary field earlier, receive pure ambient field signal, go out the interfering frequency of peak-to-peak value maximum in the ambient field signal with the methods analyst of spectrum analysis with receiving circuit
f Max The maximum ambient field undesired signal frequency that obtains according to spectrum analysis again
f Max , with the Transient Electromagnetic Apparatus transmission frequency
f 0 Guidance does
f 0 =
f Max / 2 or
f 0 =
f Max / 4 or
f 0 =
f Max / 8; The processor 11 of receiver 13 through synchro control cable 20, sends instruction to the control interface 17 of transmitter 19 from control circuit 12, makes radiating circuit 15 with transmission frequency
f 0 =
f Max / 2 or
f 0 =
f Max / 4 or
f 0 =
f Max / 8 to transmitting coil 18 transmission positive polarity electric currents, and transmitting coil 18 produces the positive polarity driving sources.At this moment, geologic body can be set up metastable positive polarity primary field under the coal mine.
Claims (3)
1. the method for a Transient Electromagnetic Apparatus ambient field guidance frequency-selecting technology removal electromagnetic interference signal is characterized in that comprising the steps:
A, do not launch primary field, receive pure ambient field signal, go out the maximum interfering frequency of peak-to-peak value in the ambient field signal with the methods analyst of spectrum analysis with receiving circuit
f Max
B, the maximum ambient field undesired signal frequency that obtains according to spectrum analysis
f Max , with the Transient Electromagnetic Apparatus transmission frequency
f 0 Guidance is:
f 0 =
f Max / (2*n), n=1 wherein, 2,4,8
The receiver of c, said Transient Electromagnetic Apparatus is controlled radiating circuit with transmission frequency through the synchro control cable
f 0 Carry the positive polarity electric current to transmitting coil, make transmitting coil produce the positive polarity primary field; Receiver turn-offs transmitting coil positive polarity electric current fast through the synchro control cable, makes the inductive loop that geologic body has encouraged under the coal mine will produce time dependent positive polarity secondary field;
D, receiver are in the quiescent interval territory that primary field is closed; Regularly receive geologic body positive polarity secondary field under the coal mine continuously through receiving coil and receiving circuit; Obtain the signal of timing positive polarity secondary field continuously, receiving coil receives ambient field undesired signal frequency simultaneously
f Max
E, in like manner, the receiver of said Transient Electromagnetic Apparatus control radiating circuit is with transmission frequency
f 0 Carry the negative polarity electric current to transmitting coil, make transmitting coil produce the negative polarity primary field; Receiver turn-offs transmitting coil positive polarity electric current fast through the synchro control cable, makes the inductive loop that geologic body has encouraged under the coal mine will produce time dependent negative polarity secondary field;
F, receiver regularly receive geologic body negative polarity secondary field under the coal mine through receiving coil and receiving circuit continuously in the quiescent interval territory that primary field is closed, obtain the signal of negative polarity secondary field, and receiving coil receives ambient field undesired signal frequency simultaneously
f Max
2. Transient Electromagnetic Apparatus ambient field guidance frequency-selecting technology according to claim 1 is removed the method for electromagnetic interference signal, it is characterized in that further comprising the steps:
G, repeat above-mentioned some cycles of c-f step, what obtain some cycles contains ambient field undesired signal frequency
f Max Positive polarity secondary field signal and negative polarity secondary field signal;
H, with the negative value signal on the occasion of signal Reduction of Students' Study Load polarity secondary field of positive polarity secondary field.
3. Transient Electromagnetic Apparatus ambient field guidance frequency-selecting technology according to claim 1 is removed the method for electromagnetic interference signal, it is characterized in that: said Transient Electromagnetic Apparatus transmission frequency
f 0 Guidance does
f 0 =
f Max / 2 or
f 0 =
f Max / 4 or
f 0 =
f Max / 8.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064129A (en) * | 2012-12-29 | 2013-04-24 | 福州华虹智能科技开发有限公司 | Magnetic vibration comprehensive detecting instrument underground coal mine and magnetic vibration comprehensive detection method |
| CN103064119A (en) * | 2013-01-05 | 2013-04-24 | 江苏大学 | Fixed high sampling rate design method for time domain variable electromagnetic detecting instrument |
| CN105044781A (en) * | 2015-06-04 | 2015-11-11 | 成都理工大学 | System and method for generating synchronous transient electromagnetic signal source |
| CN106405663A (en) * | 2016-10-09 | 2017-02-15 | 煤炭科学技术研究院有限公司 | Mine transient electromagnetic data acquisition device based on background field feedback and mine transient electromagnetic data acquisition method thereof |
| CN107765319A (en) * | 2017-10-09 | 2018-03-06 | 中国矿业大学(北京) | A kind of Mine Transient Electromagnetic Method resistivity correction method |
| CN108152857A (en) * | 2017-11-13 | 2018-06-12 | 中南大学 | A kind of electromagnetic prospecting system and method |
| CN108845363A (en) * | 2018-08-29 | 2018-11-20 | 中交第公路工程局有限公司 | A method of improving tunnel tunnel face transient electrical magnetic spy water signal-to-noise ratio |
| CN111751892A (en) * | 2020-06-19 | 2020-10-09 | 重庆大学 | Mine transient electromagnetic detection method based on bipolar current with 100% duty ratio |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064129A (en) * | 2012-12-29 | 2013-04-24 | 福州华虹智能科技开发有限公司 | Magnetic vibration comprehensive detecting instrument underground coal mine and magnetic vibration comprehensive detection method |
| CN103064129B (en) * | 2012-12-29 | 2016-03-09 | 福州华虹智能科技开发有限公司 | Underground coal mine magnetic shake comprehensive survey instrument and magnetic shake composite geophysical methods |
| CN103064119A (en) * | 2013-01-05 | 2013-04-24 | 江苏大学 | Fixed high sampling rate design method for time domain variable electromagnetic detecting instrument |
| CN105044781A (en) * | 2015-06-04 | 2015-11-11 | 成都理工大学 | System and method for generating synchronous transient electromagnetic signal source |
| CN106405663A (en) * | 2016-10-09 | 2017-02-15 | 煤炭科学技术研究院有限公司 | Mine transient electromagnetic data acquisition device based on background field feedback and mine transient electromagnetic data acquisition method thereof |
| CN107765319A (en) * | 2017-10-09 | 2018-03-06 | 中国矿业大学(北京) | A kind of Mine Transient Electromagnetic Method resistivity correction method |
| CN108152857A (en) * | 2017-11-13 | 2018-06-12 | 中南大学 | A kind of electromagnetic prospecting system and method |
| CN108845363A (en) * | 2018-08-29 | 2018-11-20 | 中交第公路工程局有限公司 | A method of improving tunnel tunnel face transient electrical magnetic spy water signal-to-noise ratio |
| CN111751892A (en) * | 2020-06-19 | 2020-10-09 | 重庆大学 | Mine transient electromagnetic detection method based on bipolar current with 100% duty ratio |
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Application publication date: 20121024 |