CN104035135B - A kind of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor - Google Patents
A kind of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor Download PDFInfo
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- CN104035135B CN104035135B CN201410304214.8A CN201410304214A CN104035135B CN 104035135 B CN104035135 B CN 104035135B CN 201410304214 A CN201410304214 A CN 201410304214A CN 104035135 B CN104035135 B CN 104035135B
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Abstract
The invention provides a kind of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor, comprise coil, magnetic core and external shield sleeve pipe, magnetic core is cylindric, and magnetic core adopts MnZn ferrite material to make; Described coil is for receiving earth's surface natural pulses electromagnetic field and converting electric signal to, and coil is wrapped on magnetic core in the same direction evenly, closely; Described external shield sleeve pipe is the copper pipe of cylindric ground connection, external shroud pipe box is on magnetic core and coil, the two ends of coil are stretched out by the same one end open on external shield sleeve pipe, gap place between magnetic core and external shield sleeve pipe is filled with solid gum, and magnetic core and coil are fixed in external shield sleeve pipe by described solid gum; The bottom of described external shield sleeve pipe has the length opening identical with core length vertically.This sensor also can be applicable to the multinomial research of other field, as underground oil and gas exploration, the VLF-EM signal radiation field source fields such as three-dimensional early warning of coming down, has good market application foreground.
Description
Technical field
The invention provides and a kind ofly can receive earth natural pulses electromagnetic field very low frequency signal and can the natural magnetic field that earth surface converts be changed the receiving sensor of the electric signal of linear change into, can be applicable to earthquake precursors research and earthquake prediction field, oil-gas exploration and to study and come down electromagnetism early warning field.
Background technology
Earthquake brings huge disaster to the life of the mankind, and according to statistics, among the disaster in the whole world, the death toll that earthquake causes accounts for 54% of whole disaster death toll, can be rated as disaster.How to predict that a popular responsive topic is not only in earthquake more accurately, the expectation of the whole mankind especially.But because earthquake prediction has " non-frequent ", " complicacy of seismic physical process " three difficulty greatly of " impenetrability " of earth interior, violent earthquake, earthquake prediction becomes generally acknowledged global problem.
The earth is not carrying out natural trend all the time, such as curstal fault band, rock slides, landslide is bred, the multiple natural trend such as air thunder and lightning, these natural trend all can cause occurring very low frequency (VLF) section day to become magnetic anomaly signal, especially before generation earthquake, focus place is due to earth movement, strong pulse electromagnetic field abnormal signal can be sent, but it is less for the information research of this very low frequency (VLF) section at present, also do not set up the correlation model bred between very low frequency (VLF) section natural pulses electromagnetic field of earthquake, wherein key reason is that the sensor that can receive this frequency range is also unrealized.If these very low frequency (VLF) earth natural pulses electromagnetic field signals can be gathered, so provide great help by the research of information of earthquake.In addition, can also be applied to other multinomial researchs in VLF-EM signal radiation field source field, as underground oil and gas exploration, three-dimensional early warning etc. of coming down, tool is of great significance.
Summary of the invention
The invention provides a kind of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor, this device solves the problem that very low frequency (VLF) earth natural pulses electromagnetic field signal gathers technically, for providing indispensable physics collecting device basis from very low frequency (VLF) angle Study of Seismic precursor information.This sensor also can be applicable to the multinomial research of other field, as underground oil and gas exploration, the VLF-EM signal radiation field source fields such as three-dimensional early warning of coming down, has good market application foreground.
Realize the technical scheme that above-mentioned purpose of the present invention adopts as follows:
A kind of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor, comprise coil, magnetic core and external shield sleeve pipe, magnetic core is cylindric, and its diameter is 8 ~ 10mm, and length is 160 ~ 180mm, and magnetic core adopts MnZn ferrite material to make; Described coil is for receiving earth's surface natural pulses electromagnetic field and converting electric signal to, and coil is wrapped on magnetic core in the same direction evenly, closely, is wound with 1900 ~ 2100 circles; Described external shield sleeve pipe is the copper pipe of cylindric ground connection, external shroud pipe box is on magnetic core and coil, its internal diameter is 9 ~ 11mm, its length 8 ~ 12mm larger than core length, the two ends of coil are stretched out by the same one end open on external shield sleeve pipe, gap place between magnetic core and external shield sleeve pipe is filled with solid gum, and magnetic core and coil are fixed in external shield sleeve pipe by described solid gum; The bottom of described external shield sleeve pipe has the length opening identical with core length vertically, and the width of described opening is 3mm; Described coil is the enameled wire of diameter 0.1mm.
Earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor provided by the invention, can change the electric signal of linear change into, and be exported by voltage signal by the natural magnetic field that earth surface converts.Set external shield sleeve pipe solves a difficult problem for artificial field interference, effectively can receive again very low frequency (VLF) frequency range natural pulses Geomagnetic signal simultaneously.Novel structure of the present invention, respond well, the needs of scientific analysis research can be met, have positive meaning to the omen research of geophysics's exploration, geology analysis and disaster.In addition, the present invention has good application prospect equally in fields such as earthquake prediction, hydrocarbon exploration, landslide electromagnetism early warning.
Accompanying drawing explanation
Fig. 1 is the structural representation of magnetic core and coil;
Fig. 2 is one-piece construction schematic diagram of the present invention;
Fig. 3 is the sectional view of external shield sleeve pipe;
In figure: 1-magnetic core, 2-coil, 3-external shield sleeve pipe.
Embodiment
Below in conjunction with drawings and the specific embodiments, detailed specific description is done to the present invention, but protection scope of the present invention is not limited to following examples.
The one-piece construction of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor provided by the invention as shown in Figure 2, be made up of coil 2, magnetic core 1 and external shield sleeve pipe 3, described magnetic core 1 is in cylindric, its diameter is 8 ~ 10mm, length is 160 ~ 180mm, and magnetic core adopts MnZn ferrite material to make; Described coil 2 is for receiving earth's surface natural pulses electromagnetic field and converting electric signal to, and coil is wrapped on magnetic core in the same direction evenly, closely, is wound with 1900 ~ 2100 circles, and as shown in Figure 1, described coil 2 is the enameled wire of diameter 0.1mm.
Described external shield sleeve pipe 3 is the copper pipe of cylindric ground connection, external shield sleeve pipe 3 is enclosed within magnetic core and coil, its internal diameter is 9 ~ 11mm, its length 8 ~ 12mm larger than core length, the two ends of coil are stretched out by the same one end open on external shield sleeve pipe, gap place between magnetic core and external shield sleeve pipe is filled with solid gum, and magnetic core and coil are fixed in external shield sleeve pipe by described solid gum; The bottom of described external shield sleeve pipe has the length opening identical with core length vertically, as shown in Figure 3.
The principle of work of the earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor provided in the present embodiment is as follows: according to Maxwell's Theory of Electromagnetic Field, the electric field of change can produce magnetic field at its surrounding space, and the magnetic field of change can produce electric field.Electromagnetic wave is aloft propagated, and as conductor, inductive action will occur, in conductor, produce induced current, makes us can receive from radio signal at a distance with wire.According to the direction of antenna electric field, i.e. polarised direction, be divided into the mode such as linear polarization and circular polarisation, the polarised direction of linear polarization is consistent with the trend of antenna, and the polarised direction of circular polarisation constantly rotates change round antenna axis, viewed from antenna axis direction, electric field is exactly a circle, therefore is called circular polarisation.
Only have that the polarised direction of receiving antenna is consistent with received polarization of electromagnetic wave direction just can induce maximum signal.According to this principle, for linear polarization, when polarised direction consistent with linear polarization direction (direction of an electric field) of receiving antenna, the signal induced maximum (electromagnetic wave projects maximum in polarised direction); Along with when departing from more and more in the polarised direction of receiving antenna and linear polarization direction, the signal induced less (projection constantly reduces); When polarised direction orthogonal with linear polarization direction (magnetic direction) of receiving antenna, the signal induced is zero (being projected as zero).For circular polarisation, regardless of the polarised direction of receiving antenna, the signal induced is all identical, does not have what difference (electromagnetic wave projection is in any direction all the same).So, adopt circular polarisation mode, system is reduced the azimuthal sensitivity of antenna.Thus, our earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor have employed circular polarisation mode.
The ability of magnetic antenna Received signal strength is relevant with the size of the length L of magnetic core and cross-sectional area.Because the magnetic line of force distribution on high of earth natural pulses electromagnetic field is very intensive, the xsect of magnetic core is larger, number through it is more, the voltage that coil is responded to is larger, sensitivity is higher, and on the other hand, magnetic core is longer, the intensity of the magnetic line of force that it absorbs is larger, and the voltage that coil induces is also higher.But be subject to the impact of magnetic core internal loss and volume, the rugosity of magnetic core and length are also conditional, therefore the magnetic core that this sensor is selected is manganese-zinc ferrite, black is circular, diameter 8 ~ 10mm, length is 160 ~ 180mm, and frequency of operation is low, magnetic permeability is higher, be applicable to the reception of middle long wave, as shown in Figure 2.
The another one key factor affecting sensor performance is the inductance value of telefault, the size of telefault inductance value, thickness that is general and wire used when making, be coiled into the shape of rear coil, the factor such as size and the number of turn is relevant, the number of turn is more, pitch of turn is less, inductance value is larger, but due to the existence of distributed capacitance between circle and circle, the frequency of operation of coil is affected, and the Q value of coil is declined, the number of turn can not be too much, in order to better receive very low frequency signal, the enameled wire diameter that the design's coil adopts is 0.1mm, the number of turn is 1900 ~ 2100 circles, resistance value is about 140 ohm.
Simultaneously in order to reduce the impact of ambient noise signal, the design is the copper pipe of 3mm at antenna outer cover a kerf, copper pipe ground connection, as shown in Figure 3.
Claims (1)
1. an earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor, is characterized in that: comprise coil, magnetic core and external shield sleeve pipe, magnetic core is cylindric, and its diameter is 8 ~ 10mm, and length is 160 ~ 180mm, and magnetic core adopts MnZn ferrite material to make; Described coil is for receiving earth's surface natural pulses electromagnetic field and converting electric signal to, and coil is wrapped on magnetic core in the same direction evenly, closely, is wound with 1900 ~ 2100 circles; Described external shield sleeve pipe is the copper pipe of cylindric ground connection, external shroud pipe box is on magnetic core and coil, its internal diameter is 9 ~ 11mm, its length 8 ~ 12mm larger than core length, the two ends of coil are stretched out by the same one end open on external shield sleeve pipe, gap place between magnetic core and external shield sleeve pipe is filled with solid gum, and magnetic core and coil are fixed in external shield sleeve pipe by described solid gum; The bottom of described external shield sleeve pipe has the length opening identical with core length vertically, and the width of described opening is 3mm; Described coil is the enameled wire of diameter 0.1mm.
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| CN201410304214.8A CN104035135B (en) | 2014-06-27 | 2014-06-27 | A kind of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor |
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| CN201410304214.8A CN104035135B (en) | 2014-06-27 | 2014-06-27 | A kind of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor |
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| CN104035135B true CN104035135B (en) | 2015-12-09 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104391337B (en) * | 2014-12-22 | 2016-02-10 | 中国地质大学（武汉） | For receiving the monitoring instrument of earth natural pulses electromagnetic field signal |
| CN104782514B (en) * | 2015-04-09 | 2017-11-17 | 昆明医科大学第一附属医院 | A kind of biological experiment platform for simulating earth magnetism outburst |
| CN106483555B (en) * | 2016-09-28 | 2018-05-22 | 中国地质大学（武汉） | Green's function-SPWVD the Time-Frequency Analysis Methods of ENPEMF data |
| CN108957589A (en) * | 2018-09-21 | 2018-12-07 | 安徽惠洲地质安全研究院股份有限公司 | More exploration geophysical field signal receiving sensors and sensor string, observation system |
| CN109471158A (en) * | 2019-01-22 | 2019-03-15 | 张银海 | A method of it is predicted an earthquake using the variation of monitoring VLF electromagnetic radiation intensity |
| CN112448148B (en) * | 2019-09-05 | 2023-07-14 | 北京华航无线电测量研究所 | Magnetic field antenna for low-frequency electromagnetic communication of moving platform and working method |
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| DE102008042800A1 (en) * | 2008-10-13 | 2010-04-15 | Robert Bosch Gmbh | Device for measuring the direction and / or strength of a magnetic field |
| CN202018514U (en) * | 2011-03-02 | 2011-10-26 | 长安大学 | Shielding magnetic probe for transient electromagnetic receiving antenna |
| CN103472490A (en) * | 2013-09-05 | 2013-12-25 | 中煤科工集团西安研究院 | Mining intrinsic safety type transient electromagnetic instrument receiving antenna |
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| CA2670354C (en) * | 2006-12-11 | 2017-10-03 | Quasar Federal Systems, Inc. | Compact underwater electromagnetic measurement system |
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|---|---|---|---|---|
| DE102008042800A1 (en) * | 2008-10-13 | 2010-04-15 | Robert Bosch Gmbh | Device for measuring the direction and / or strength of a magnetic field |
| CN202018514U (en) * | 2011-03-02 | 2011-10-26 | 长安大学 | Shielding magnetic probe for transient electromagnetic receiving antenna |
| CN103472490A (en) * | 2013-09-05 | 2013-12-25 | 中煤科工集团西安研究院 | Mining intrinsic safety type transient electromagnetic instrument receiving antenna |
Non-Patent Citations (1)
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| 《交流电磁场检测探头材料仿真分析与实验研究》;李伟等;《仪表技术与传感器》;20130531(第5期);第79-80页 * |
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