CN206563613U - Electromagnetic surveying noise measurement system - Google Patents
Electromagnetic surveying noise measurement system Download PDFInfo
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- CN206563613U CN206563613U CN201720062488.XU CN201720062488U CN206563613U CN 206563613 U CN206563613 U CN 206563613U CN 201720062488 U CN201720062488 U CN 201720062488U CN 206563613 U CN206563613 U CN 206563613U
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Abstract
The utility model provides a kind of electromagnetic surveying noise measurement system, the receiving electrode group at measurement spacing is preset including an emission electrode being connected with emitter and with emission electrode distance, the receiving electrode group includes multiple receiving electrodes, and each receiving electrode is connected with signal pickup assembly；Also include the noise testing electrode being arranged between adjacent reception electrode, noise testing electrode is connected with signal pickup assembly；Emission electrode is on same line direction with receiving electrode；The cloth set direction of noise testing electrode is orthogonal with line direction.Electromagnetic surveying noise measurement system of the present utility model, by laying noise testing electrode between adjacent reception electrode, emission electrode is set to be in receiving electrode on same line direction, the cloth set direction of noise testing electrode is orthogonal with line direction, reach that both effectively collection receiving terminal receives signal, the ambient noise signal of receiving terminal can be gathered again, be easy to follow-up to various signals progress noise reduction process, the true field signal needed for obtaining.
Description
Technical field
The utility model is related to technical field of geophysical exploration, more particularly to a kind of electromagnetic surveying noise measurement system.
Background technology
The characteristics of electromagnetic surveying has low, convenient and swift cost, high resolution, the metal mineral reserves that are particularly suitable for use in detection, mesh
It is preceding to turn into the study hotspot in field of geophysical exploration.
But on the one hand the intensity of useful signal decays rapidly with the increase of reception and transmission range in electromagnetic surveying, receiving
End electric-field intensity typically can only achieve mV ranks；On the other hand, with the development of economy and society, various ambient noises are more and more tighter
Weight, in the work area of the humane frequent activity in part, electric power interference, mechanical disturbance, spike interference strength are very big, useful signal often by
These ambient noises are flooded.
Noise reduction means common at present are increase transmission powers, are repeatedly emitted into row data investigation, using notch filter etc.
Digital Signal Processing means carry out noise filtering.But for receiving and dispatching away from the case of greatly, the effect that increase transmission power is brought is micro-
Its is micro-.Repeatedly being emitted into row data investigation can only suppress random noise, it is impossible to filter out human noise, and work as noise content
When complicated, general digital filtering technique also is difficult to obtain preferable noise reduction.
Utility model content
The utility model provides a kind of electromagnetic surveying noise measurement system, bad for solving noise reduction in the prior art
The problem of.
The utility model provides a kind of electromagnetic surveying noise measurement system, including：One transmitting being connected with emitter is electric
Pole and the receiving electrode group with the emission electrode at default measurement spacing, it is electric that the receiving electrode group includes multiple receptions
Pole, each receiving electrode is connected with signal pickup assembly；Also include the noise testing electricity being arranged between adjacent reception electrode
Pole, the noise testing electrode is connected with signal pickup assembly；
Wherein, the emission electrode is on same line direction with the receiving electrode；The noise testing electrode
Cloth set direction is orthogonal with the line direction.
Alternatively, the signal pickup assembly includes oscillograph.
Alternatively, the default measurement spacing is 4-8km.
Alternatively, the laying distance of the emission electrode is 300-600m.
Alternatively, memory cell is set in the signal pickup assembly.
As shown from the above technical solution, electromagnetic surveying noise measurement system of the present utility model, by adjacent reception electricity
Noise testing electrode between pole, makes emission electrode be in receiving electrode on same line direction, the cloth of noise testing electrode
Set direction is orthogonal with line direction, has reached both that effectively collection receiving terminal received signal, and the ambient noise signal of energy receiving terminal, just
In subsequently carrying out noise reduction process to various signals, required true field signal is obtained.
Brief description of the drawings
The structure distribution schematic diagram for the electromagnetic surveying noise measurement system that Fig. 1 provides for the utility model embodiment；
The distribution schematic diagram for the dipole field that Fig. 2 provides for the utility model embodiment；
Fig. 3 is the signal schematic representation that receiving electrode is gathered；
Fig. 4 is the noise signal schematic diagram that noise testing electrode is gathered；
Fig. 5 is the schematic diagram that noise reduction is followed by the collection of letters number；
Fig. 6 is the earth pulse respond schematic diagram that picks out before and after noise reduction.
Embodiment
With reference to the accompanying drawings and examples, embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not limited to scope of the present utility model.
The utility model provides a kind of electromagnetic surveying noise measurement system, including：One transmitting being connected with emitter is electric
Pole and the receiving electrode group with the emission electrode at default measurement spacing, it is electric that the receiving electrode group includes multiple receptions
Pole, each receiving electrode is connected with signal pickup assembly；Also include the noise testing electricity being arranged between adjacent reception electrode
Pole, the noise testing electrode is connected with signal pickup assembly；Wherein, the emission electrode is in same with the receiving electrode
On line direction；The cloth set direction of the noise testing electrode is orthogonal with the line direction.
Embodiment as shown in Figure 1 provides a kind of electromagnetic surveying noise measurement system, including a hair being connected with emitter
Radio pole and the receiving electrode group with the emission electrode at default measurement spacing, the receiving electrode group include two receptions
Electrode, each receiving electrode is connected with signal pickup assembly.
The system also includes being arranged on noise testing electrode between two receiving electrodes, the noise testing electrode with
Signal pickup assembly is connected.
Wherein, the emission electrode is on same line direction with the receiving electrode；The noise testing electrode
Cloth set direction is orthogonal with the line direction.
In the utility model embodiment, because the reception and transmission range in electromagnetic surveying is generally up to several kilometers, therefore in this reality
It can be 4-8km to apply and measurement spacing is preset in example.The laying distance of the emission electrode can be 300-600m.Laying distance is relative
For reception and transmission range, described emission electrode just can be equivalent to a pair of electric dipoles.As shown in Fig. 2 dipole field is along axis
It is symmetric, i.e., there is electrical potential difference in the axial direction.This is also the voltage signal measured by noise testing electrode, and in axle
It is equipotential points at the symmetric position of line both sides (orthogonal direction), electrical potential difference is zero.Noise testing electrode described in the utility model
Measurement point be equipotential points in Fig. 2, the measurement point of receiving electrode is that the potential in Fig. 2 is not good enough.
In the ideal situation, due between equipotential points potential-free it is poor, noise testing electrode does not observe any signal, but real
On border, due to there is ambient noise, and its distribution does not possess symmetry, therefore the signal that noise testing electrode is recorded is complete
The ambient noise in portion.
In the utility model embodiment, the signal pickup assembly can be oscillograph, for collection voltages signal.
In the utility model embodiment, the signal pickup assembly interior can set memory cell, be collected with storage
The function of data.
Because during electromagnetic surveying, receiving electrode collection voltages signal is simultaneously stored, noise testing electrode collection voltages
Signal is simultaneously stored.The collection of noise testing electrode is noise signal, and receiving electrode collection is mixed signal, i.e., including dipole
Field signal and noise signal.Therefore, to obtain final electromagnetic probe signal needs the noise signal and mixing letter to getting
Number handled.
Therefore, in processing procedure, each signal pickup assembly needs the voltage signal collected being sent to for carrying out
In the processor of signal transacting.
The processor is obtained after signal, signal can be handled according to default process step, needed for finally giving
Electrical measurement detectable signal.
Signal transacting step is explained below：
The distribution character of dipole field is primarily due to, noise testing pole layout direction must be orthogonal to line direction, this
Sample just can guarantee that all ambient noises of surveyed data.
Two kinds of signals are included in receiving terminal：Along the dipole field signal of line direction, i.e. field signal s (t) and along orthogonal
The ambient noise signal n (t) in direction.Wherein that receiving electrode collection is mixed signal s (the t)+n (t) of the two, noise testing electricity
Pole collection is ambient noise signal n (t).
Because all there is bandwidth, decay and wave distortion, therefore the signal that measurement apparatus recorded in any measurement apparatus
Often there is distortion in waveform, i.e., there is deviation between " actual signal " and " tracer signal ".It is theoretical according to Signals ＆ Systems, it is " true
The convolution of real signal " and " impulse response " of measurement apparatus is exactly " tracer signal ".
For ease of distinguishing, show actual signal and tracer signal with following symbol table：
S (t)-real field signal
N (t)-real noise signal
mn(t) noise signal of-record
mr(t) mixed signal of-record
hn(t) impulse response of-noise testing electrode
hr(t) impulse response of-receiving electrode
*-convolution symbol
Understood according to Signals ＆ Systems theory：
The noise signal of record is equal to the convolution of noise testing electrode impulse response and true noise signal, i.e.,：
mn(t)=hn(t)*n(t) (1)
Similarly, the mixed signal of record is：
mr(t)=hr(t) * (n (t)+s (t))=hr(t)*n(t)+hr(t)*s(t) (2)
Obviously h in (2) formular(t) * n (t) are noise component(s), from mr(t) m is subtracted inn(t) to weaken the noise component(s), i.e.,：
mr(t)-mn(t)=hr(t)*n(t)-hn(t)*n(t)+hr(t)*s(t) (3)
It can be seen that, only hn(t)=hr(t) when, i.e., when noise testing electrode is identical with the impulse response of receiving electrode, noise
Component could be rejected effectively, and now (3) formula can be write：
mr(t)-mn(t)=hr(t)*s(t) (4)
As in (4) formula, its result does not include noise component(s), illustrates that noise testing electrode described in the utility model is recorded
Noise signal by realizing noise eliminating after signal transacting.
But the h in (4) formular(t) * s (t) are not real field signal s (t), and direct use can reduce the quality of data,
Therefore also need by deconvolution from hr(t) s (t) is recovered in * s (t).
Remember hs (t)=hr(t)*s(t)。
The purpose of deconvolution is that s (t) is recovered from hs (t).
Due to hr(t) be receiving electrode used impulse response, be known.Therefore an inverse operator f (t) can be solved, made
Obtain hr(t) * f (t)=δ (t), wherein δ (t) are unit impulse signal, and δ (t) and any signal convolution are equal to the signal sheet
Body.
Convolution algorithm is made to f (t) and hs (t), had：
F (t) * hs (t)=f (t) * hr(t) * s (t)=δ (t) * s (t)=s (t) (5)
Thus real field signal s (t) can be tried to achieve, the signal can be used for the data processing in later stage and possess higher noise
Than.
Specific embodiment：To verify the feasibility of system described in the utility model, intersect at a high speed with corridor deep blue at a high speed in Bao Jin
Southwest at, provincial highway S334 east northeasts side has carried out one-time authentication experiment.The survey line south is apart from Wenan county town about 4km, survey line north and south
End longitude and latitude is respectively 38 ° of 52'26.15 " north；116 ° of 24'50.86 " east and 38 ° of 54'13.02 " north；116 ° of 21'22.65 " east.
This experiment emission current 30A, it is 300m that emitter stage, which lays distance, and it is 50m that receiving pole, which lays distance, and reception and transmission range is 4km.
Because survey line is close to provincial highway, therefore spike serious interference, reception area has power transmission line and power transformer in addition, exists
Serious electric power interference.Fig. 3 is receives data, and useful signal is almost flooded by noise completely.Fig. 4 makes an uproar to be described in the utility model
The background noise data that sound measurement electrode is measured.Noise reduction is carried out to Fig. 4 data, Fig. 5 is seen.
Can clearly it be told from fig. 5, it can be seen that carrying out noise reduction and can effectively suppress the reception signal after noise, noise reduction
Launch the envelope of source signal.The earth pulse respond is entered using the reception data after original received data and noise reduction respectively
Fig. 6 is shown in row identification, identification result contrast.
It can be seen that after system acquisition data described in the utility model and to Noise reducing of data, the earth pulse respond
Precision be improved with smoothness, be computed, the identification signal to noise ratio of pulse respond improves 40dB in the present embodiment.
Although in addition, it will be appreciated by those of skill in the art that some embodiments described herein include other embodiments
In included some features rather than further feature, but the combination of the feature of be the same as Example does not mean in this practicality newly
Within the scope of type and form different embodiments.For example, in the following claims, embodiment claimed
One of any mode can use in any combination.
The utility model is limited it should be noted that above-described embodiment is illustrated rather than to the utility model,
And those skilled in the art can design alternative embodiment without departing from the scope of the appended claims.In right
It is required that in, any reference symbol between bracket should not be configured to limitations on claims.Word "comprising" is not arranged
Except there is element or step not listed in the claims.Word "a" or "an" before element does not exclude the presence of many
Individual such element.The utility model can be by means of including the hardware of some different elements and by means of properly programmed
Computer is realized.In if the unit claim of equipment for drying is listed, several in these devices can be by same
One hardware branch is embodied.The use of word first, second, and third does not indicate that any order.Can be by these lists
Word is construed to title.
One of ordinary skill in the art will appreciate that：Various embodiments above is only to illustrate technical side of the present utility model
Case, rather than its limitations；Although the utility model is described in detail with reference to foregoing embodiments, this area it is common
Technical staff should be understood：It can still modify to the technical scheme described in foregoing embodiments, or to wherein
Some or all of technical characteristic carries out equivalent substitution；And these modifications or replacement, do not make the essence of appropriate technical solution
Depart from the utility model claim limited range.
Claims (5)
1. a kind of electromagnetic surveying noise measurement system, it is characterised in that including：One emission electrode for being connected with emitter and with
Receiving electrode group at the default measurement spacing of emission electrode distance, the receiving electrode group includes multiple receiving electrodes, often
Individual receiving electrode is connected with signal pickup assembly；Also include the noise testing electrode being arranged between adjacent reception electrode, institute
Noise testing electrode is stated to be connected with signal pickup assembly；
Wherein, the emission electrode is on same line direction with the receiving electrode；The laying of the noise testing electrode
Direction is orthogonal with the line direction.
2. system according to claim 1, it is characterised in that the signal pickup assembly includes oscillograph.
3. system according to claim 1, it is characterised in that the default measurement spacing is 4-8km.
4. system according to claim 1, it is characterised in that the laying distance of the emission electrode is 300-600m.
5. system according to claim 1, it is characterised in that set memory cell in the signal pickup assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720062488.XU CN206563613U (en) | 2017-01-18 | 2017-01-18 | Electromagnetic surveying noise measurement system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720062488.XU CN206563613U (en) | 2017-01-18 | 2017-01-18 | Electromagnetic surveying noise measurement system |
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| CN206563613U true CN206563613U (en) | 2017-10-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679795A (en) * | 2017-01-18 | 2017-05-17 | 北京工业大学 | Electromagnetic detection noise measurement system and noise reduction method |
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2017
- 2017-01-18 CN CN201720062488.XU patent/CN206563613U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679795A (en) * | 2017-01-18 | 2017-05-17 | 北京工业大学 | Electromagnetic detection noise measurement system and noise reduction method |
| CN106679795B (en) * | 2017-01-18 | 2023-10-03 | 北京工业大学 | Electromagnetic detection noise measurement system and noise reduction method |
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Granted publication date: 20171017 Termination date: 20200118 |