CN202033478U - Very low frequency electromagnetic instrument with orthogonal antenna - Google Patents
Very low frequency electromagnetic instrument with orthogonal antenna Download PDFInfo
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- CN202033478U CN202033478U CN 201120131551 CN201120131551U CN202033478U CN 202033478 U CN202033478 U CN 202033478U CN 201120131551 CN201120131551 CN 201120131551 CN 201120131551 U CN201120131551 U CN 201120131551U CN 202033478 U CN202033478 U CN 202033478U
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Abstract
The utility model discloses a very low frequency electromagnetic instrument with an orthogonal antenna, and comprises an electromagnetic induction signal receiving unit, a signal processing unit and an output unit which are all sequentially connected. The electromagnetic induction signal receiving unit includes an orthogonal receiving antenna and a very low frequency wave band receiving module. The orthogonal receiving antenna responds to electromagnetic signals and transmits the signals to the very low frequency wave band receiving module. The very low frequency wave band receiving module outputs amplitude values of the electromagnetic signals to the signal processing unit, and the signal processing unit processes the signals and sends data to the output unit so that the output unit can output the data. The very low frequency electromagnetic instrument uses the orthogonal antenna which can simultaneously measure electromagnetic component signals in the horizontal direction and electromagnetic component signals in the vertical direction at one measurement spot, therefore errors produced by manual operation and labor intensity of measurement operators are reduced. In addition, by means of the very low frequency wave band receiving module, noise interference of detected electromagnetic induction signals is small, the signals are stable and reliable, and the detected data are accurate.
Description
Technical field
The utility model relates to a kind of surveying instrument of electromagnetic induction signal, relates in particular to the digital very low frequency electromagnetical receiver of the electromagnetic induction signal difference that a kind of electromagnetic wave of measuring very low frequency (VLF) radio station emission causes.
Background technology
The magnetic component that vertical electric dipole produced that is positioned at the face of land has only horizontal component, if in the far field and consider field in the limited area, primary field approaches along the face of land to be close to the transverse magnetic field plane wave of the incident that is oriented in a tangential direction usually.Electrical discrepant geologic body in underground part or interphase, under the effect of horizontal primary field, will induce secondary field, then vertical component must appear, primary field is identical with the secondary field frequency, but phase place and amplitude are inconsistent, their interaction forms synthetic, synthetic elliptical polarization spatially (synthetic track is oval), the tangent value of its polarization ellipse inclination angle D angle of Z-axis (ellipse short shaft with) is directly proportional with the secondary field vertical component, therefore, measure the variation at polarization ellipse inclination angle, in fact just can reflect the variation of induction secondary field vertical component.
Very low frequency electromagnetical receiver just the electromagnetic wave (radiowave of 15-25KHz wave band) by measuring the emission of very low frequency (VLF) radio station on the face of land, aerial or electromagnetic induction signal difference that the subsurface investigation field causes; thereby obtain the electrical property feature of measurement zone geologic body, and then judge the abnormal information of the electrically unusual or underground structure of geologic body.At present, very low frequency electromagnetical receiver has become survey instrument important in underground water detection, prospecting for mineral deposits and the geologic mapping, especially at aspects such as surveying the latent metal mineralising low-resistance band of shallow-layer, structure shatter belt and moisture fracture fissure zone very large effect is arranged.
Existing product was designed in the phase at the end of the eighties in last century, and based on Analog Circuit Design, display result adopts simulated pointer to show, needs artificial reading, and measured value can not directly be stored, and need manual record, and surveying instrument can not be handled measurement data in real time.This has increased the intensity of surveying work and the human factor of measurement result greatly.
The measuring method of while existing product is more complicated also, need be after finding horizontal survey component peak signal, keep the measuring position motionless, instrument is with the hands held up, and keep instrument perpendicular to the ground, be axle then with the wrist, rotate the maximal value that instrument is sought vertical component, write down the magnetic dip of this point then.This metering system, the one-shot measurement result need divide for two steps finished, and not only increased operating personnel's working strength, and for guaranteeing measuring accuracy, reduced error, require a survey line as far as possible people's operation finish.
Summary of the invention
The purpose of this utility model is to overcome the defective that existing very low frequency electromagnetical receiver needs the manual record data, a kind of New Digital very low frequency electromagnetical receiver is provided, can directly carry out storing or the numeral demonstration after the digitized processing to detected electromagnetic induction signal, and one-shot measurement can obtain the electromagnetic component signal of level and vertical direction simultaneously, and metering system is simple.
Very low frequency electromagnetical receiver with orthogonal antenna comprises electromagnetic induction signal receiving element, signal processing unit and output unit, electromagnetic induction signal receiving element, signal processing unit and output unit are connected successively, the electromagnetic induction signal receiving element comprises quadrature receiving antenna and very low frequency (VLF) wave band receiver module, quadrature receiving antenna inductive electromagnetic signal also is transferred to very low frequency (VLF) wave band receiver module with signal, the amplitude of very low frequency (VLF) wave band receiver module output electromagnetic signal is given signal processing unit, and the signal processing unit processes signal also sends data to output unit output.
Described electromagnetic induction signal receiving element also comprises the phase-locked loop circuit that is used for stable electrical magnetic signal frequency, and phase-locked loop circuit is connected with very low frequency (VLF) wave band receiver module.
Described electromagnetic induction signal receiving element also comprises the measurement of dip angle module that is used to measure magnetic dip.Measurement of dip angle module transmission measurement data are given signal processing unit.
Described very low frequency (VLF) wave band receiver module comprises a wave filter, a frequency mixer, DDS frequency generation module, AGC automatic gain control circuit, intermediate frequency amplifier circuit, detecting circuit and filtering circuit, the input end that is used for the electromagnetic induction signal filter filtering is connected with the output terminal of receiving antenna, and output terminal connects frequency mixer; DDS frequency generation module output terminal is connected with frequency mixer; The electromagnetic induction signal of wave filter input is connected the intermediate frequency amplifier circuit that is used for the intermediate-freuqncy signal amplification with the output terminal that the signal that DDS frequency generation module produces is formed the frequency mixer of harmonic ringing, intermediate frequency amplifier circuit is connected with filtering circuit successively with detecting circuit, the amplitude of filtering circuit output electromagnetic induction signal; The input end of AGC automatic gain control circuit is connected with the output terminal of detecting circuit, and output terminal is connected with intermediate frequency amplifier circuit.The electromagnetic induction signal that receiving antenna receives is after wave filter filters in the input mixer, form harmonic ringing with the electromagnetic signal that DDS frequency generation module produces, be input to intermediate frequency amplifier circuit and carry out the intermediate-freuqncy signal amplification, the intermediate-freuqncy signal of amplifying is converted to the amplitude output of institute's selected frequency electromagnetic induction signal behind detecting circuit and filtering circuit, AGC automatic gain control circuit input termination intermediate frequency amplifier circuit, the input end of output termination filtering circuit.Receiving antenna end band filter plays and eliminates antenna noise jamming and preliminary election long wave frequency.And frequency mixer with filtering after the signal that produces of signal and DDS frequency generation module form resonance signal, to select the radio signals of different frequency.Harmonic ringing is not enough to the amplification of small-signal by AGC automatic gain control circuit solution fixed intermediate frequency signal amplification factor then, supersaturation problem of dtmf distortion DTMF to large-signal, reach and guarantee that intermediate-freuqncy signal does not change with radio signals is strong and weak, impels the signal effect of tending towards stability.Last signal is by the amplitude of detecting circuit and filtering circuit output electromagnetic induction signal.
Described quadrature receiving antenna comprises the magnetic rod antenna of two orthogonal intersections.
Described magnetic rod antenna is for receiving the magnetic rod antenna of 15-25KHz wave band.
Described signal processing unit comprises the main control module that is used for data processing and control and is used for the internal storage of data storage that internal storage is connected with the main control module.
Described signal processing unit also comprises the outside extended memory interface unit that is used to connect external memory storage, and outside extended memory interface unit is connected with the main control module.
Described output unit comprises display module and host communication interface, and display module is connected with the main control module respectively with the host communication interface.The display module video data, the host communication interface is realized and upper machine communication.
The beneficial effects of the utility model:
1, adopts the quadrature receiving antenna can on a measurement point, measure the electromagnetic component signal of level and vertical direction simultaneously, reduced the error that manual operation produces, reduced the labour intensity of survey crew.
2, adopt very low frequency (VLF) wave band receiver module, detected electromagnetic induction signal noise jamming is little, and signal stabilization is reliable, and it is accurate to detect data.
3, adopt signal processing unit and output unit to guarantee the real-time measurement and the storage of measurement data, do not need manual record, and main control module output digital signal, manually reading has reduced the intensity of surveying work and the human factor of measurement result.
4, all of digital very low frequency electromagnetical receiver are unit-modularized, and volume is little, and are easy to carry, simple to operate, easier popularization.
Description of drawings
Fig. 1 is the structural representation of very low frequency electromagnetical receiver;
Fig. 2 is the structural representation of the very low frequency electromagnetical receiver of the utility model embodiment;
Fig. 3 is the structural representation of very low frequency (VLF) wave band receiver module among Fig. 2;
Fig. 4 is a receiving antenna structural representation among the utility model embodiment;
Embodiment
Below in conjunction with accompanying drawing the very low frequency electromagnetical receiver with orthogonal antenna of the present utility model is described in detail.
Generally, very low frequency electromagnetical receiver all comprises electromagnetic induction signal receiving element 10, signal processing unit 20 and output unit 30, electromagnetic induction signal receiving element 10, signal processing unit 20 and output unit 30 are connected successively, be transferred to signal processing unit 20 after electromagnetic induction signal receiving element 10 receives electromagnetic induction signal, signal processing unit 20 processing signals also send result to output unit 30 outputs.As shown in Figure 1.
And the electromagnetic induction signal receiving element 10 of the very low frequency electromagnetical receiver with orthogonal antenna of present embodiment comprises quadrature receiving antenna 1 and two very low frequency (VLF) wave band receiver modules 2, quadrature receiving antenna 1 is transferred to two very low frequency (VLF) wave band receiver modules 2 respectively with vertical electromagnetic component signal and horizontal electromagnetic component signal, and the amplitude of very low frequency (VLF) wave band receiver module 2 output electromagnetic induction signals is given signal processing unit 20.As shown in Figure 2.
The electromagnetic induction signal unit also comprises phase-locked loop circuit 3 and measurement of dip angle module 4, and phase-locked loop circuit 3 is used for stablizing the frequency of very low frequency (VLF) wave band receiver module 2 from the electromagnetic induction signal of receiving antenna acquisition, is connected with very low frequency (VLF) wave band receiver module 2.Phase-locked loop circuit 3 is connected with main control module 201 simultaneously, accepts the control of main control module 201.Measurement of dip angle module 4 is connected 201 with the main control module, measures the magnetic dip data and measurement data is transferred to the main control module 201 of signal processing unit 20.
Referring to Fig. 3, very low frequency (VLF) wave band receiver module 2 comprises a wave filter, one frequency mixer, DDS frequency generation module, the AGC automatic gain control circuit, intermediate frequency amplifier circuit, detecting circuit and filtering circuit, the electromagnetic induction signal that receiving antenna receives passes through in the input circuit input mixer after wave filter filters, form harmonic ringing with the electromagnetic signal that DDS frequency generation module produces, be input to intermediate frequency amplifier circuit and carry out the intermediate-freuqncy signal amplification, the intermediate-freuqncy signal of amplifying is through the detecting circuit detection, after output institute selected frequency electromagnetic induction signal amplitude after filtering circuit filtering again.And AGC automatic gain control circuit input termination detecting circuit output terminal, output termination intermediate frequency amplifier circuit.The AGC automatic gain control circuit guarantees that intermediate-freuqncy signal does not change with radio signals is strong and weak, impels signal to tend towards stability.
Referring to Fig. 2, signal processing unit 20 comprises main control module 201, internal storage 202, outside extended memory interface unit 203, internal storage 202 is connected with main control module 201 respectively with outside extended memory interface unit, and main control module 201 is carried out data processing and control; Internal storage 202 storage data; Outside extension storage interface 203 connects external memory storage.Be used for the growth data storage.Signal processing unit 20 can also comprise a keyboard components 204, and keyboard components 204 is responsible for the input of man-machine interaction control signal.As shown in Figure 2.Main control module 201 can be a single-chip microcomputer.
Digital very low frequency electromagnetical receiver also comprises Power Supply Assembly, is the said units power supply.
Referring to Fig. 2 and Fig. 4, the quadrature receiving antenna 1 that present embodiment adopts is the magnetic rod antenna 11 of two orthogonal intersections, and this magnetic rod antenna is the magnetic rod antenna that receives the 15-25KHz wave band.This magnetic rod antenna 11 can be straight rod, also can be the annular rod.
What the principle of work of digital very low frequency electromagnetical receiver adopted is a kind of alternating current magnetic method that works in the 15-25KHz wave band.Experiment shows, (under the f＜105Hz), the electric conductivity of rock and ore mainly shows as conduction current, and the electric conductivity of rock and ore depends primarily on their conductivity at low frequency.And the resistivity feature of rock and ore shows, different rocks has different conductivity, and this explanation is more obvious when the electrical property difference of study area geologic body to be detected and its country rock, and then the off-note of geophysical measurement also more obviously.In addition, grow the location at the structure shatter belt, the physico-chemical property obvious difference of structure shatter belt and its both sides country rock (weak shifting ground plastid), especially in the structure shatter belt, grown by the filling of polymetallic ore arteries and veins, mineralized alteration zone, and the relative growth and the enrichment of fault gouge, clay mineral and underground water, crevice water, in the very low frequency (VLF) electromagnetic measurement, all there is tangible low-resistance to reflect unusually usually.The very low frequency (VLF) electromagnetic measurement just is being based on the geologic body space, and to form the distribution of conductivity of (mineral, rock) inhomogeneous, is that it is measured polarization ellipse inclination angle and changes thereby cause the measured value of very low frequency (VLF) surveying instrument, reflects the electrical property feature of land burial body indirectly.
The quadrature receiving antenna 1 that the utility model adopts can the intact electromagnetic induction signal of one-shot measurement vertical component and horizontal component, measure simple and convenient.
Using method:
Measure to prepare: in the measurement point start, the machine self check is also searched for the very low frequency (VLF) electromagnetic signal, treat signal stabilization after, locking frequency or survey frequency manually is set.
Measure: hand-held instrument also makes the instrument level, and body erect is that axle horizontal rotates instrument then with the health, and when hearing the instrument buzzing, horizontal survey finishes; Along direction finding to next measuring point, begin next measurement, so circulation is finished up to this survey line, then measures next side line.Can from display module 301, check measurement result at any time in the measuring process.
Measure to finish, by host communication interface 302 with data transmission to host computer, also can data be saved on the external memory storage by outside extension storage interface 203.Host communication interface 302 can be the RS232 interface; Outside extension storage interface 203 can be the usb interface.
Claims (9)
1. very low frequency electromagnetical receiver with orthogonal antenna, comprise the electromagnetic induction signal receiving element, signal processing unit and output unit, the electromagnetic induction signal receiving element, signal processing unit is connected successively with output unit, it is characterized in that the electromagnetic induction signal receiving element comprises quadrature receiving antenna and very low frequency (VLF) wave band receiver module, quadrature receiving antenna inductive electromagnetic signal also is transferred to very low frequency (VLF) wave band receiver module with signal, the amplitude of very low frequency (VLF) wave band receiver module output electromagnetic signal is given signal processing unit, and the signal processing unit processes signal also sends data to output unit output.
2. the very low frequency electromagnetical receiver with orthogonal antenna as claimed in claim 1 is characterized in that, described electromagnetic induction signal receiving element also comprises the phase-locked loop circuit that is used for stable electrical magnetic signal frequency, and phase-locked loop circuit is connected with very low frequency (VLF) wave band receiver module.
3. the very low frequency electromagnetical receiver with orthogonal antenna as claimed in claim 1 is characterized in that, described electromagnetic induction signal receiving element also comprises the measurement of dip angle module that is used to measure magnetic dip.
4. the very low frequency electromagnetical receiver with orthogonal antenna as claimed in claim 1, it is characterized in that, described very low frequency (VLF) wave band receiver module comprises a wave filter, a frequency mixer, DDS frequency generation module, AGC automatic gain control circuit, intermediate frequency amplifier circuit, detecting circuit and filtering circuit, the input end that is used for the electromagnetic induction signal filter filtering is connected with the output terminal of receiving antenna, and output terminal connects frequency mixer; DDS frequency generation module output terminal is connected with frequency mixer; The electromagnetic induction signal of wave filter input is connected the intermediate frequency amplifier circuit that is used for the intermediate-freuqncy signal amplification with the output terminal that the signal that DDS frequency generation module produces is formed the frequency mixer of harmonic ringing, intermediate frequency amplifier circuit is connected with filtering circuit successively with detecting circuit, the amplitude of filtering circuit output electromagnetic induction signal; The input end of AGC automatic gain control circuit is connected with the output terminal of detecting circuit, and output terminal is connected with intermediate frequency amplifier circuit.
5. the very low frequency electromagnetical receiver with orthogonal antenna as claimed in claim 1 is characterized in that described quadrature receiving antenna comprises the magnetic rod antenna of two orthogonal intersections.
6. the very low frequency electromagnetical receiver with orthogonal antenna as claimed in claim 5 is characterized in that, described magnetic rod antenna is for receiving the magnetic rod antenna of 15-25KHz wave band.
7. the very low frequency electromagnetical receiver with orthogonal antenna as claimed in claim 1, it is characterized in that, described signal processing unit comprises the main control module that is used for data processing and control and is used for the internal storage of data storage that internal storage is connected with the main control module.
8. the very low frequency electromagnetical receiver with orthogonal antenna as claimed in claim 7, it is characterized in that, described signal processing unit comprises the outside extended memory interface unit that is used to connect external memory storage, and outside extended memory interface unit is connected with the main control module.
9. the very low frequency electromagnetical receiver with orthogonal antenna as claimed in claim 1 is characterized in that, described output unit comprises display module and host communication interface, and display module is connected with the main control module respectively with the host communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120131551 CN202033478U (en) | 2011-04-29 | 2011-04-29 | Very low frequency electromagnetic instrument with orthogonal antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201120131551 CN202033478U (en) | 2011-04-29 | 2011-04-29 | Very low frequency electromagnetic instrument with orthogonal antenna |
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| CN202033478U true CN202033478U (en) | 2011-11-09 |
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| CN 201120131551 Expired - Fee Related CN202033478U (en) | 2011-04-29 | 2011-04-29 | Very low frequency electromagnetic instrument with orthogonal antenna |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441803A (en) * | 2013-09-10 | 2013-12-11 | 北京科技大学 | Underground low-frequency wireless communication system based on low-power small electric antenna |
| CN103985218A (en) * | 2014-05-16 | 2014-08-13 | 中国矿业大学 | Electromagnetic radiation detection device and method for potential fire danger of mine |
| CN105353418A (en) * | 2015-12-04 | 2016-02-24 | 唐山迁西坤宇物探科技有限公司 | Ion remote sensing geophysical prospecting instrument and remote sensing geophysical prospecting method thereof |
| CN108365325A (en) * | 2017-12-28 | 2018-08-03 | 中国电子科技集团公司第二十研究所 | A kind of low frequency navigation miniaturization magnetic array |
| CN108490493A (en) * | 2018-03-19 | 2018-09-04 | 重庆轻足迹电子有限公司 | Conducting wire detection device |
-
2011
- 2011-04-29 CN CN 201120131551 patent/CN202033478U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441803A (en) * | 2013-09-10 | 2013-12-11 | 北京科技大学 | Underground low-frequency wireless communication system based on low-power small electric antenna |
| CN103441803B (en) * | 2013-09-10 | 2015-09-16 | 北京科技大学 | A kind of underground low frequency wireless communication system based on low-power small electric antenna |
| CN103985218A (en) * | 2014-05-16 | 2014-08-13 | 中国矿业大学 | Electromagnetic radiation detection device and method for potential fire danger of mine |
| CN103985218B (en) * | 2014-05-16 | 2016-10-26 | 中国矿业大学 | Mine hidden fire hazard electromagnetic radiation detecting device and method |
| CN105353418A (en) * | 2015-12-04 | 2016-02-24 | 唐山迁西坤宇物探科技有限公司 | Ion remote sensing geophysical prospecting instrument and remote sensing geophysical prospecting method thereof |
| CN108365325A (en) * | 2017-12-28 | 2018-08-03 | 中国电子科技集团公司第二十研究所 | A kind of low frequency navigation miniaturization magnetic array |
| CN108365325B (en) * | 2017-12-28 | 2020-02-07 | 中国电子科技集团公司第二十研究所 | Low-frequency navigation miniaturized magnetic array |
| CN108490493A (en) * | 2018-03-19 | 2018-09-04 | 重庆轻足迹电子有限公司 | Conducting wire detection device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20130429 |