CN106324325B - Utilize the method for the initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning - Google Patents
Utilize the method for the initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning Download PDFInfo
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- CN106324325B CN106324325B CN201610895559.4A CN201610895559A CN106324325B CN 106324325 B CN106324325 B CN 106324325B CN 201610895559 A CN201610895559 A CN 201610895559A CN 106324325 B CN106324325 B CN 106324325B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/12—Measuring rate of change
Abstract
The invention discloses a kind of methods using the initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning, utilize frequency-response characteristic of the low frequency magnetic field antenna outside effectively detection band limits, Mathematical treatment is carried out in the field waveform obtained at artificially triggered lightning lightning channel short distance using the method for numerical integration, the influence of noise signal in measurement process can be effectively removed, obtain characteristic discharge process in artificially triggered lightning experiment, i.e., the high time resolution waveform of initial continuous current.Low frequency magnetic field antenna production of the invention and set up relatively easy, cost is relatively low, can be stronger according to parameters, operability such as the different adjustment magnetic field antenna gains of requirement of experiment；The initial continuous current result signal-to-noise ratio of the artificially triggered lightning that inverting obtains is very high, sensor need not be laid on current path in measurement experiment, in the case where natural lightning etc. is without conducting lightning currents situation measured directly, pass through the time-varying waveform of the available continuous current discharge process of the inversion method.
Description
Technical field
The invention belongs to artificially triggered lightning discharge process field of measuring technique more particularly to a kind of utilization low frequency magnetic field antenna are distant
Connect in the initial continuous current of sensed quantity artificially triggered lightning (and high building initiation lightning) and short distance remote sensing survey Return stroke of ground flash
The method of continuous electric current.
Background technique
Artificially triggered lightning is the important technical for studying Lightning Process physical mechanism.By pulling wire from ground launch
Mouse, ground zero potential can be introduced into the high electric field environment at thunder cloud bottom, to form lasting discharge process,
Ultimately form lightning.As a kind of higher lightning measurement means of controllability, this method has been used for studying in lightning discharge
Physical process (the especially feature description of ground connection process) and the experimental verification of lightning guard technology.With the observation of natural lightning
It compares, it is known that a big advantage of artificially triggered lightning experiment, which is the channel that conducting lightning currents import ground, therefore can pass through design
Place observation experiment measures conducting lightning currents waveform.Since research team, France the 1970s develops artificially triggered lightning technology,
Current measurement is always one of research contents important in experimentation.It is real in the artificially channel braided carried out all over the world at present
In testing, generally by by coaxial shunt be connected on conducting lightning currents from drainage bar be connected to ground discharge path in realize to lightning
The direct measurement of electric current, and realized by the measurement to the electromagnetic intensity on Pearson coil and conducting lightning currents are carried out
Indirect inverting.The conducting lightning currents result that two methods obtain is almost the same, therefore is generally mated to use and is used to measure not homotype
Enclose interior the bottom of the channel current strength.Above two traditional measurement method is required to for measuring device to be placed in known lightning in advance
Electric current enters ground channel circumference, can not measure within the scope of certain distance to the conducting lightning currents for flowing through unknown discharge channel.People
Work draws the bottom of the channel in thunder experiment and lightning different stages of development or the corresponding electric current of various process has been recorded.Due to artificial
The range for drawing conducting lightning currents measuring device in thunder experimental design is larger (such as 40kA and two kinds of 2kA settings), so that measurement is set
Standby resolution ratio is smaller, and the initial continuous current stage is usually accompanied by the weak current process of order of amps, surveys in conventional current
These weak currents are superimposed with noise is measured in amount result, thus be difficult accurately to identify in initial continuous current amplitude compared with
Weak part, such as measured the biggish M component of an amplitude, but its lesser M component of several amplitudes of front and back then and
Noise is superimposed, and is difficult to identify.Therefore, for conducting lightning currents measuring device to the initial continuous current lack of resolution of lightning
The problem of, need detection method of the development with higher sensitivity on the basis of existing the bottom of the channel current measurement means.
In conclusion sensor need to be placed on the office on conducting lightning currents access in existing the bottom of the channel current measuring method
It is sex-limited and insufficient to lightning weak current resolution capability, it cannot be accurately realized and initial continuous current minutia is reconstructed.
Summary of the invention
The initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning is utilized the purpose of the present invention is to provide a kind of
Method, it is intended to the limitation on conducting lightning currents access need to be placed on by solving sensor in existing the bottom of the channel current measuring method
Property, and it is insufficient to lightning weak current resolution capability, it cannot be accurately realized and initial continuous current minutia reconstruct is asked
Topic.
In order to solve the above-mentioned technical problem, the present invention relates to a kind of using at the beginning of low frequency magnetic field antenna remote sensing survey artificially triggered lightning
The method of beginning continuous current, frequency-response characteristic of the method using low frequency magnetic field antenna outside effectively detection band limits,
At this time magnetic field antenna actual measurement to be rate of change of magnetic (dB/dt) signal, can using the method for numerical integration to the signal
To obtain true field (B) signal, while the white noise being superimposed upon on effective magnetic field signal mutually supports during numerical integration
Disappear, so that the Signal-to-Noise after Mathematical treatment is very high.In view of observation point is closer apart from artificially triggered lightning lightning channel
(78m), the magnetic field signal measured at this time are mainly induction field, and between magnetic field induction field and electric current there is coefficient to close
System, therefore the coefficient is obtained by field calibration and can be used to characteristic discharge process in the experiment of inverting artificially triggered lightning, i.e., initially
The high time resolution waveform of continuous current.
Further, the low frequency magnetic field antenna includes:
Magnetic Sensor, using close around plain conductor coil, coaxial metal lead loop is close to be wound on a relative permeability and exists
102On the soft magnetic materials bar magnet of magnitude, Magnetic Sensor is encapsulated in high-strength PVC plasticity casing, is combined using T-type connecting pipe
Be orthogonal sensor；Densely packed coil is equivalent to the circuit being made of resistance R, capacitor C and inductance L；
Magnetic Sensor is connected with signal processing circuit, and signal processing circuit includes copped wave resistance, a two-stage amplifying circuit
With a high-pass filter；Wherein copped wave resistance keeps the magnetic field measurement system bandwidth adjustable；Two-stage amplifying circuit makes measurement system
System adjustable gain；High-pass filter is for filtering industrial frequency noise；
Magnetic Sensor and signal processing circuit board, which are encapsulated in unmasked box, forms magnetic field antenna outdoor section, and to shielding
Box does water-proofing treatment.
Further, the low frequency magnetic field antenna three dB bandwidth is 6kHz-340kHz, and magnetic field sensor is surveyed in the frequency band
Amount is magnetic field B signal；Lower than 6kHz frequency on, magnetic field antenna actual measurement to be rate of change of magnetic dB/dt signal.
Further, the magnetic field B that the magnetic field antenna measures includes induction field BiWith measurement white noise Bn, meet in magnetostatics
Biot-Savart law:
Wherein h (t) is the lightning channel length of time t, and for h (t) as constant processing, α is proportionality coefficient undetermined；Due to surveying
Measure white noise BnIt cancels out each other in numerical integration operation, enables β=α h (t), then formula can be rewritten as from short distance magnetic signal
Obtain the relational expression of the bottom of the channel current waveform:
Constant beta is obtained by field calibration.
Method provided by the invention using the initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning, can with gram
The bottom of the channel measuring device is taken to the problem of lightning weak current resolution capability deficiency, can relatively accurately be realized to initial continuous
The reconstruct of electric current.The present invention is based on the wide-band magnetic fields at measurement artificially triggered lightning lightning channel short distance, obtain a kind of initial
The inversion method of continuous current waveform, traditional the bottom of the channel current measurement are by using coaxial shunt or Pearson
What coil was realized, be the standard method in artificially triggered lightning and high building initiation lightning research, and measures phase with conventional current
Than low frequency magnetic field antenna used by the method for remote-sensing inversion electric current makes and sets up and is relatively easy in the present invention, and cost is relatively low
(cost of manufacture of front end sensors is about 10 yuan, and rear end amplifying circuit cost is no more than 100 yuan), and can be wanted according to experiment
Parameters, the operability such as the different adjustment magnetic field antenna gain asked are stronger.Importantly, being obtained by this method inverting first
Beginning continuous current result signal-to-noise ratio is very high, can be used as the supplementary means of artificially triggered lightning experiment conducting lightning currents measurement, or even all
Such as natural lightning by the available conducting lightning currents of the inversion method without extremely may be used in conducting lightning currents situation measured directly
The result leaned on.
The non-classical formula artificially triggered lightning of the present invention (i.e. so-called to draw thunder in the air): in drawing in thunder test for this form, rocket
The steel wire of towing is connected with nylon wire (or cotton thread) with big earthed conductor, therefore lightning grounding channel has randomness, therefore traditional
Current metering sensor is unable to measure current waveform.In this case, remote sensing technique of the invention, which can be obtained effectively, draws ray process
In initial continuous current time-varying waveform that may be present.High building causes lightning: high building generally connects because of its lightning protection demand
Ground, therefore high building is similar to the conducting wire that rocket tows in artificially triggered lightning, equally earth conductor can be introduced into thunder cloud
High electric field area.Since the design of high building is generally complex, the electricity of high building and inflow surface is hit in measurement
It flows relatively difficult.Remote sensing technique of the invention will effectively solve this problem, help to obtain apart from one spacing of magnetic field sensor
Cause the continuous current time-varying waveform that lightning may cause from high building in range.Continuous current mistake present in Return stroke of ground flash
Journey: Return stroke of ground flash course location is difficult to predict, thus in can not dodging with directly measuring continuous current time-varying waveform.Of the invention
Remote sensing technique does not need to place a sensor on current channel, therefore can get within the scope of magnetic field sensor certain distance
Continuous current time-varying waveform caused by natural lightning.
Detailed description of the invention
Fig. 1 is that the low frequency magnetic field sensor structure figure that uses of current measuring method provided in an embodiment of the present invention (adopt by antenna
It is made of bare copper wire winding soft magnetism stick).
Fig. 2 is the working principle signal of the used low frequency magnetic field sensor of current measuring method provided in an embodiment of the present invention
Figure.
Fig. 3 is that the vertical conducting lightning currents of certain time scale provided in an embodiment of the present invention generate at 78 meters of horizontal distances
Magnetic field (lightning channel for having chosen five different heights) schematic diagram.
Fig. 4 is the frequency response curve of low frequency magnetic field sensor provided in an embodiment of the present invention.
Fig. 5 is August in a 2014 23rd provided in an embodiment of the present invention artificially triggered lightning measurement result schematic diagrames；
In figure: (a) at 78 meters low frequency magnetic field antenna measured waveform (horizontal direction channel)；(b) low frequency magnetic field at 78 meters
The measured waveform (vertical direction channel) of antenna；(c) the initial continuous current waveform by numerical integration acquisition and its same channel
The comparison of bottom measurement result.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Method packet provided in an embodiment of the present invention with the initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning
Include following steps:
Step 1, production Magnetic Sensor.Using the close scheme around plain conductor coil, in order to improve the Magnetic Sensor
Sensitivity can realize by increasing coil radius and increasing wire circle, but such that magnetic field antenna size compared with
Greatly, portable basic demand is not met, and wire circle is more, coil self-resistance is bigger, the thermal noise that conducting wire introduces
It is stronger, therefore the present invention is wound on coaxial metal lead loop is close a relative permeability higher (Effective permeability is 102Amount
Grade) soft magnetic materials bar magnet on, not only increase the sensitivity of Magnetic Sensor, while being controlled in reasonable size range
(length 20cm, diameter 1cm), it is contemplated that soft magnet material is more fragile, easy fracture, the Magnetic Sensor that will be made in the present invention
It is encapsulated in high-strength PVC plasticity casing (the about 1.8cm containing casing diameter), and the sensing that is orthogonal is combined using T-type connecting pipe
Device ensure that its use intensity and portability, as shown in Figure 1.
Step 2, modulated signal.Densely packed coil can be equivalent to by the circuit of resistance R, capacitor C and inductance L composition, and by
The magnetic field antenna of coil composition has some specific resonance frequency, this is determined by its intrinsic attribute, its calculation formula isWhen signal frequency increases to resonance frequency, Magnetic Sensor is accordingly most strong, and signal frequency continues
When increase, since the induction reactance of coil increases, so that equivalent impedance increases so that signal should be died down by Magnetic Sensor phase.This hair
It is bright that Magnetic Sensor is connected with signal processing circuit to modulated signal, the signal processing circuit mainly include copped wave resistance,
One two-stage amplifying circuit and a high-pass filter, wherein copped wave resistance can make the magnetic field measurement system bandwidth adjustable, and two
Grade amplifying circuit enables to measuring system adjustable gain, and high-pass filter is for filtering industrial frequency noise, circuit design structure figure
As shown in Figure 2.
Step 3, system calibrating.After the completion of magnetic field antenna and its circuit production, need to carry out whole system in laboratory
Stringent calibration, basic principle are the signal that a fixed frequency is generated by signal generator, which has been transmitted to one
Know the big hollow field coil of parameter, and then its internal magnetic field strength is calculated, small magnetic field antenna to be calibrated is put
Enter inside it, the signal by reading oscillograph realizes the calibration to signal under the fixed frequency, changes signal generator later
Frequency repeat this calibration process until completing the signal scaling to entire required frequency range.By testing repeatedly, the present invention is final
Realize the magnetic field antenna that a set of working frequency range covers low-frequency range: its three dB bandwidth is 6kHz-340kHz, the magnetic in the frequency band
Field sensor measurement is magnetic field (B) signal；Lower than 6kHz frequency on, magnetic field antenna actual measurement to be changes of magnetic field
Rate (dB/dt) signal, the frequency width curve for demarcating completion are as shown in Figure 3.
Step 4, system encapsulation.Magnetic Sensor and signal processing circuit board are encapsulated in unmasked box and form magnetic field antenna
Outdoor section, and water-proofing treatment is done to the shielding box.
In view of lightning occurs have space-time randomness, the magnetic field signal direction that radiation generates is uncertain, therefore this hair
It is bright it is middle receive signals using two orthogonal magnetic field antennas, while circuit board uses binary channels, and by antenna and circuit board package
It is placed in outdoor in unmasked box,
Step 5, inner and outer system joint debugging.Magnetic field antenna outdoor section and magnetic field in control room are adopted by shielding coaxial cable
Collecting system is connected, and whole system realizes the high-precision time service of sub-micro second-time, the GPS time service device by GPS time service device
Its antenna is placed in outdoor.
Step 6, data analysis.In artificially triggered lightning experiment, it can be used to by the data that above-mentioned low frequency magnetic field antenna obtains
The initial continuous current of inverting.
Application effect of the invention is explained in detail combined with specific embodiments below.
In the Shandong Zhanhua lightning observation experiment of summer in 2014, using highly sensitive wide-band magnetic field antenna away from drawing thunder
The remote sensing survey to artificially triggered lightning current course is carried out in the distance of 78 meters of point.Pass through 5 artificially triggered lightnings during analysis experiment
INTEGRATED SIGHT data, discovery magnetic remote sensing technique have good efficiency of inverse process to initial continuous current distinctive in artificially triggered lightning.
By the way that the influence of measurement noise can be effectively removed to 78 meters of magnetic measurement signal progress Integral Processings apart from upper acquisition, from
And inverting obtains the low noise time-varying waveform of initial continuous current.This method be obtain high-altitude draw thunder test in initial continuous electricity
Stream waveform provides a kind of new method, simultaneously can be used for the time-varying waveform of continuous current in short distance inverting natural lightning.
1, measurement and data
Data used in the present invention obtain in the Shandong artificially triggered lightning experiment of summer in 2014, the lightning of the bottom of the channel
Electric current uses bandwidth directly to measure acquisition for the 5m Ω coaxial shunt of 0-3.2MHz series connection drainage bar.Drawing thunder steel wire is preferably
It is buckled on drainage bar.In addition, drainage bar bottom has surround Pearson coil (bandwidth is 0.9Hz~1.5MHz) also to obtain
It the kiloampere magnitude electric current caused by processes such as must fight back.Magnetic field at 78 meters is by intersecting magnetic coil measurement.According in laboratory
Calibration result, the three dB bandwidth of Magnetic Sensor is 6kHz to 340kHz.In the frequency lower than 6kHz, the gain of Magnetic Sensor
Increase (this intrinsic attribute for depending primarily on magnetic coil) with the increase of frequency, is the initial continuous current that the present invention introduces
The working frequency range of short distance remote sensing technique.
In artificially triggered lightning experiment, rocket pulls metal wire and (uses diameter 0.2mm, unit length in SHATLE observation
Resistance is 7 Ω/m steel wire) risen with the desin speed of 100m/s.Since steel wire remains ground state, and more than ground
Potential be constantly lesser the situation of negative polarity artificially triggered lightning (consider).Therefore, when the electric field risen near steel wire terminal reaches
When to breakdown threshold, the positive guide of a duration will be formed and with 2 × 104M/s to 1.8 × 105The speed of m/s upwardly propagates.
Generally after positive guide originates 5-10 milliseconds, positive leader channel continues the charge transmission as it can be seen that i.e. over the ground on high-speed camera
Into the initial continuous current stage.It is visible with the initial continuous current stage that the positive guide of 2014 5 times artificially triggered lightnings originates height
Passage length (including drawing thunder cable segments) as listed in table 1.The present invention is with August artificially triggered lightning of 16:11:06UTC on the 23rd
Experiment is embodiment, but is not necessarily limited by the embodiment.By the used higher sensitivity of low frequency magnetic field antenna, August 18 is removed
Outside the experiment of day 04:17:18UTC, there is a degree of saturated phenomenon in the other 4 times horizontal channel magnetic-field measurements for drawing thunder,
And the signal in vertical channel direction is weaker and unsaturated, but the measuring signal noise of vertical direction is relatively low.
Channel height when 1 2014 year positive guide of summer artificially triggered lightning of table originates highly visible with lightning channel continuous illumination
2, method and theoretical basis
During the artificially triggered lightning of SHATLE Experimental Base, when lasting upward positive leader occurs in plain conductor head
When, draw the height that thunder rocket usually has increased to 150 meters or more.Positive guide upwardly propagate during by thunder cloud body and its week
To ground, corresponding current elements are transmitted downwards along approximately perpendicular thunder wire channel of drawing for negative charge transport in collarette border,
Electromagnetic radiation model as shown in figure 3, wherein h is height of the current source initial position apart from ground, c be electromagnetic wave in an atmosphere
(approximation is taken as the light velocity in vacuum, i.e., 3 × 10 to spread speed8M/s), v is the speed that current elements are propagated downwards along lightning channel, l
For the horizontal distance (uniformly taking 78m in the present invention discusses) of magnetic field antenna and drainage bar.
Assuming that the magnetic field that magnetic field antenna receives can be calculated by formula (1) in the case that ground conductivity is infinitely great:
The induction field that wherein first item on the right of equation and Section 2 are referred to as lightning magnetic field (is denoted as Bi) and spoke
It penetrates field component and (is denoted as Br), the value of H, which is equal to, draws thunder conductor length h.Since the initial continuous current of artificially triggered lightning typically lasts for tens
To several hundred milliseconds, the full width at half maximum of the variation of initial continuous current and M component that are superimposed thereon is also several hundred delicate to several millis
Second-time, therefore these electric currents include more low-frequency components, it is contemplated that spread speed of the electric current on steel wire is 108M/s number
Magnitude, and the horizontal distance of magnetic field antenna and drainage bar is only 78m, so when electromagnetic field propagation delay is much smaller than conducting lightning currents
Between scale.In this case, the electric current on channel at any time, which is all phase, can be assumed for the initial continuous current stage
With, Charge Source is located at the top of thunder cloud internal channel.
As it can be seen from table 1 positive guide originates height and is substantially distributed between 140~400 meters in artificially triggered lightning experiment, and
Conductor length is by longer (400 meters or more) when initial continuous current initially forms.Calculated result based on line mode shows
When in conducting wire the time scale of electric current and M component quite or it is longer when, no matter conductor length, magnetic that current emissions generate
Its induction field of field is occupied an leading position always, and radiation field can be ignored.In addition, conductor length increases to induction field
Influence it is smaller and smaller, when conductor length is greater than 400 meters, the induction field measured at 78 meters is not substantially with conductor length
Increase and changes.
Based on the above results it is found that the magnetic field B that magnetic field antenna measures only has induction field Bi(B is denoted as with measurement white noisen) group
At meeting the Biot-Savart law in magnetostatics:
Wherein h (t) is the lightning channel length of time t, is had already described above when the formation of initial continuous current, conducting wire is long
Influence to magnetic field very little is spent, therefore h (t) can be handled as constant, α is proportionality coefficient undetermined.It is white in view of measuring
Noise meets relational expressionAnd setting β=α h (t), then formula (2) can be rewritten as obtains from short distance magnetic signal
The relational expression of the bottom of the channel current waveform:
Wherein the value of constant beta is the same as Magnetic Sensor to the distance dependent of lightning channel bottom.According to formula (3) it is found that just
The inverting of beginning continuous current can be realized by the method that the magnetic field measured magnetic field antenna carries out time integral.
3, result
The above method is applied to during 5 artificially triggered lightnings that 2014 obtain, obtains more satisfactory result.
Introduce the inversion result of the method for the present invention for embodiment with the August artificially triggered lightning experiment of 16:11:06UTC on the 23rd below.
Fig. 5 is magnetic-field measurement result at 78 meters of the initial continuous current of the embodiment (horizontally and vertically two
Respectively as shown in figure 5 a and 5b, wherein horizontal direction measurement result signal-to-noise ratio is higher for the measurement result in a channel) and electric current survey
Amount and inversion result (Fig. 5 c), wherein the horizontal direction magnetic field signal being recorded indicates that the period has saturation in fig 5 a.Such as
In Fig. 5 c shown in imaginary point line, in utilizing horizontal direction magnetic field signal inversion result, although on the period of saturation closely
The numerical integration in magnetic field can not obtain current waveform, but at other times in section, inverting current waveform embodies actual measurement well
Most features of current waveform, including the weaker initial continuous electricity of the initial continuous current change procedure in part and some intensity
Pulse is flowed, due to signal saturation, inversion result and measured result will appear certain translation.It is made for magnetic field signal saturation
At the incomplete problem of inversion result, the present invention can utilize designed magnetic field antenna the surveyed letter of vertical channel and horizontal channel
Number proportionate relationship, vertical direction unsaturation magnetic field signal is replaced into horizontal direction saturation magnetic field signal, reconstructed horizontal channel
It is shown in solid in magnetic field signal, and then inverting obtains the time-varying waveform of initial continuous current, result such as Fig. 5 c, it can be seen that
Electric current inversion result is essentially coincided with measured result waveform, and the white noise due to being superimposed in magnetic field observation result is in inverting side
It is cancelled out each other in method by numerical integration, so that the current waveform that inverting obtains is more smooth, can preferably parse weak current.
The above description is only an embodiment of the present invention, is not intended to limit the invention, all in the spirit and principles in the present invention
Within made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of method using the initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning, which is characterized in that described
It is effectively being detected using the method for the initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning using low frequency magnetic field antenna
Frequency-response characteristic outside band limits is obtained using the method for numerical integration at artificially triggered lightning lightning channel short distance
The field waveform obtained carries out Mathematical treatment, effectively removes the influence of noise signal in measurement process, obtains in artificially triggered lightning experiment
Characteristic discharge process, i.e., the high time resolution waveform of initial continuous current；
The low frequency magnetic field antenna includes:
Magnetic Sensor, using close around plain conductor coil, coaxial metal lead loop is close to be wound on a relative permeability 102Amount
On the soft magnetic materials bar magnet of grade, Magnetic Sensor is encapsulated in high-strength PVC plasticity casing, is combined into just using T-type connecting pipe
Hand over sensor；Densely packed coil is equivalent to the circuit being made of resistance R, capacitor C and inductance L；
Magnetic Sensor is connected with signal processing circuit, and signal processing circuit includes copped wave resistance, a two-stage amplifying circuit and one
A high-pass filter；Wherein copped wave resistance keeps the magnetic field measurement system bandwidth adjustable；Two-stage amplifying circuit increases measuring system
Benefit is adjustable；High-pass filter is for filtering industrial frequency noise；
Magnetic Sensor and signal processing circuit board, which are encapsulated in unmasked box, forms magnetic field antenna outdoor section, and does to shielding box
Water-proofing treatment；
The magnetic field B that the magnetic field antenna measures includes induction field BiWith measurement white noise Bn, meet the Biot- in magnetostatics
Savart law:
Wherein h (t) is the lightning channel length of time t, and for h (t) as constant processing, α is proportionality coefficient undetermined；It is white due to measuring
Noise BnIt cancels out each other in numerical integration operation, enables β=1/ (α .h (t)), then formula can be rewritten as obtains from short distance magnetic signal
Obtain the relational expression of the bottom of the channel current waveform:
Constant beta is obtained by field calibration.
2. the method for utilizing the initial continuous current of low frequency magnetic field antenna remote sensing survey artificially triggered lightning as described in claim 1,
It is characterized in that, the low frequency magnetic field antenna three dB bandwidth is 6kHz-340kHz, and what magnetic field sensor measured in the frequency band is
Magnetic field (B) signal；Lower than 6kHz frequency on, magnetic field antenna actual measurement to be rate of change of magnetic (dB/dt) signal.
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| CN108020704B (en) * | 2017-11-27 | 2019-08-16 | 清华大学 | A kind of thunder and lightning substrate current inversion method based on deconvolution |
| CN109900974B (en) * | 2019-03-29 | 2021-02-02 | 中国科学院大气物理研究所 | Experimental method for measuring lightning magnetic field pulse signals of underground space |
| CN111896795B (en) * | 2020-07-16 | 2023-01-03 | 中国人民解放军陆军工程大学 | Cloud lightning current waveform measuring method and system |
| CN113433394B (en) * | 2021-06-08 | 2022-06-21 | 中国气象科学研究院 | Medium-low frequency radiation magnetic field antenna for detecting lightning |
| CN115744926B (en) * | 2022-11-14 | 2023-09-12 | 中国科学院大气物理研究所 | System for artificially generating lightning lava |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1845409A (en) * | 2005-04-08 | 2006-10-11 | 中国科学院寒区旱区环境与工程研究所 | Rocket line-pulling type artificial thunderbolt-bringing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1845409A (en) * | 2005-04-08 | 2006-10-11 | 中国科学院寒区旱区环境与工程研究所 | Rocket line-pulling type artificial thunderbolt-bringing system |
Non-Patent Citations (1)
| Title |
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| Characterization of initial current pulses in negative rocket-triggered lightning with sensitive magnetic sensor;Gaopeng Lu等;《Radio Science》;20160731;第51卷(第9期);第1-13 * |
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