CN202093186U - Digital type very low frequency (VLF) electromagnetic instrument - Google Patents
Digital type very low frequency (VLF) electromagnetic instrument Download PDFInfo
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- CN202093186U CN202093186U CN 201120131505 CN201120131505U CN202093186U CN 202093186 U CN202093186 U CN 202093186U CN 201120131505 CN201120131505 CN 201120131505 CN 201120131505 U CN201120131505 U CN 201120131505U CN 202093186 U CN202093186 U CN 202093186U
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Abstract
The utility model discloses a digital type very low frequency (VLF) electromagnetic instrument. The digital type very low frequency (VLF) electromagnetic instrument comprises an electromagnetic induction signal receiving unit, a signal processing unit and an output unit which are connected in sequence, the electromagnetic induction signal receiving unit receives an electromagnetic induction signal and then transmits the electromagnetic induction signal to the signal processing unit, the signal processing unit carries out signal processing and transmits data to the output unit, the signal processing unit comprises a master control module for processing and controlling data and an internal memorizer for data storage, and the internal memorizer is connected with the master control module. By adopting the master control module and the internal memorizer, the digital type VLF electromagnetic instrument ensures the real-time measurement and storage of measurement data without manual record, and manual readout is not required as the master control module outputs a digital signal, thus reducing measuring work intensity and anthropic factors of a measurement result. In the utility model, a receiving antenna and a VLF waveband receiving module are adopted, the detected electromagnetic induction signals has small noise jamming and high detection accuracy.
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 magnetic dip D angle of Z-axis (ellipse short shaft with) is directly proportional with the secondary field vertical component, therefore, measure the variation of polarization ellipse magnetic dip, 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.
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 carries out storing or the numeral demonstration after the digitized processing detected electromagnetic induction signal.
Digital very low frequency electromagnetical receiver 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 is transferred to signal processing unit after receiving electromagnetic induction signal, signal processing unit carries out signal Processing and sends data to output unit output, 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.Adopted signal processing unit, measured value can directly be stored, thereby and the main control module measuring-signal digitizing can be sent to output unit and carry out numeral output, do not need manual record, and can handle measurement data in real time.
Described electromagnetic induction signal receiving element comprises receiving antenna and very low frequency (VLF) wave band receiver module, and 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.
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 receiving antenna is for receiving the magnetic rod antenna of 15-25KHz wave band.
Described magnetic rod antenna comprises bar magnet, aerial coil, lead-in wire and radome, and aerial coil is on bar magnet, and lead-in wire is connected the aerial coil two ends, and radome is enclosed within outside the aerial coil.Bar magnet is made by soft magnetic ferrite.Have higher magnetoconductivity and resistivity, stronger directivity can improve the antijamming capability of receiving antenna.
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.
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.
The beneficial effects of the utility model:
1, adopts the main control module and the internal storage of signal processing unit, guarantee the real-time measurement and the storage of measurement data, do not needed 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.
2, adopt receiving antenna and very low frequency (VLF) wave band receiver module, detected electromagnetic induction signal noise jamming is little, testing result accuracy height.
3, adopt magnetic rod antenna can improve the antijamming capability that signal receives.
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 the main TV structure synoptic diagram of magnetic rod antenna among Fig. 2;
Fig. 5 is the side-looking structural representation of magnetic rod antenna among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing digital very low frequency electromagnetical receiver 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 signal processing unit 20 of the digital very low frequency electromagnetical receiver of present embodiment 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 unit 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.
Referring to Fig. 2, electromagnetic induction signal receiving element 10 comprises receiving antenna 1 and very low frequency (VLF) wave band receiver module 2, receiving antenna 1 inductive electromagnetic signal also is transferred to very low frequency (VLF) wave band receiver module 2 with signal, and the amplitude of very low frequency (VLF) wave band receiver module 2 output electromagnetic induction signals is given the main control module 201 of signal processing unit 20.
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.
Digital very low frequency electromagnetical receiver also comprises Power Supply Assembly, is above-mentioned electromagnetic induction signal receiving element 10, signal processing unit 20 and output unit 30 power supplies.
Referring to Fig. 4 and Fig. 5, the receiving antenna 1 that present embodiment adopts is for receiving the magnetic rod antenna of 15-25KHz wave band, comprise bar magnet 11, aerial coil 12, lead-in wire 13 and radome 14, aerial coil 12 is on bar magnet 11, lead-in wire 13 is connected the two ends of aerial coil 12, and radome 14 is enclosed within outside the aerial coil 12.
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, thereby the measured value that causes the very low frequency (VLF) surveying instrument is its measurement polarization ellipse magnetic dip to change, and reflects the electrical property feature of land burial body indirectly.
Using method:
Measure to prepare: measuring the starting point start, the machine self check is also searched for the very low frequency (VLF) electromagnetic signal, treat signal stabilization after, locking frequency.
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, and promptly measures the horizontal component of electromagnetic induction signal; Keep health motionless, hand-held instrument upwards makes instrument vertical, and arm is motionless, is that axle is moving with the wrist, rotate palm, hear the instrument buzzing, promptly measure the vertical component of electromagnetic induction signal, so far, this measurement point is measured and is finished, and continues to measure to next measuring point, finishes up to this survey line.Then measure 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. digital very low frequency electromagnetical receiver, 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, the electromagnetic induction signal receiving element is transferred to signal processing unit after receiving electromagnetic induction signal, signal processing unit carries out signal Processing and sends data to output unit output, it is characterized in that described signal processing unit comprises main control module that is used for data processing and control and the internal storage that is used for data storage, internal storage is connected with the main control module.
2. digital very low frequency electromagnetical receiver as claimed in claim 1, it is characterized in that, described electromagnetic induction signal receiving element comprises receiving antenna and very low frequency (VLF) wave band receiver module, 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.
3. digital very low frequency electromagnetical receiver as claimed in claim 2 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.
4. digital very low frequency electromagnetical receiver as claimed in claim 2 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.
5. digital very low frequency electromagnetical receiver as claimed in claim 2, 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.
6. digital very low frequency electromagnetical receiver as claimed in claim 2 is characterized in that, described receiving antenna is for receiving the magnetic rod antenna of 15-25KHz wave band.
7. digital very low frequency electromagnetical receiver as claimed in claim 6 is characterized in that described magnetic rod antenna comprises bar magnet, aerial coil, lead-in wire and radome, and aerial coil is on bar magnet, and lead-in wire is connected the aerial coil two ends, and radome is enclosed within outside the aerial coil.
8. digital very low frequency electromagnetical receiver as claimed in claim 1 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. digital very low frequency electromagnetical receiver according to 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 201120131505 CN202093186U (en) | 2011-04-29 | 2011-04-29 | Digital type very low frequency (VLF) electromagnetic instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120131505 CN202093186U (en) | 2011-04-29 | 2011-04-29 | Digital type very low frequency (VLF) electromagnetic instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093186U true CN202093186U (en) | 2011-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120131505 Expired - Fee Related CN202093186U (en) | 2011-04-29 | 2011-04-29 | Digital type very low frequency (VLF) electromagnetic instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202093186U (en) |
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2011
- 2011-04-29 CN CN 201120131505 patent/CN202093186U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
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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: 20111228 Termination date: 20130429 |