CN106090631A - A kind of long oil pipeline road leak detecting device and detection method - Google Patents
A kind of long oil pipeline road leak detecting device and detection method Download PDFInfo
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- CN106090631A CN106090631A CN201610681821.5A CN201610681821A CN106090631A CN 106090631 A CN106090631 A CN 106090631A CN 201610681821 A CN201610681821 A CN 201610681821A CN 106090631 A CN106090631 A CN 106090631A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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Abstract
The present invention relates to a kind of pipe detection device field, it is specifically related to a kind of long oil pipeline road leak detecting device and signal filtering method, in order to solve existing long oil pipeline road Leak Detection and the inaccurate problem not enough with filter effect of positioner, and provide a kind of long oil pipeline road leak detecting device and signal filtering method, including controller module, power module, signal detection module and signal processing module；Controller module is provided with processor, and one end of signal processing module connects with signal detection module, for receiving detection signal from signal detection module；The other end of signal processing module is connected with controller module, the signal after processing to controller module transmission.Present invention additionally comprises a kind of long oil pipeline road leakage detection method.The present invention is applicable to pipeline leakage testing.
Description
Technical field
The present invention relates to a kind of pipe detection device and method, be specifically related to a kind of long oil pipeline road leak detecting device and
Detection method.
Background technology
Along with scientific and technical innovation level and application development, information technology is in commercial production and society
Service aspect plays increasing effect, and labor efficiency is greatly improved, and is made that immeasurable tribute for its people's development
Offer.Particularly at field of industrial production, Automatic Measurement Technique is utilized to be monitored in real time and accurately to detected object,
For being specifically designed to the leakage detection method in long oil pipeline road, up to the present the wrong method used is various, but these detection sides
Method is scarcely easily maintained, detects the shortcomings such as inaccurate, location, leak position inaccuracy.Simultaneously as detection device is often in
Field, solving the problem that single battery power supply mode brought needs relatively reliable technical scheme.It addition, environment at the scene
In the case of relatively complicated, as in pipeline, the fricative static interference of material or the Nature because of extreme weather generation are put
Detection device all can be produced serious influence by high-voltage impact etc. that is electric and that produce, it is therefore desirable to detection device will be to sensor
Signal effectively filters.
Prior art use digital filter be filtered reducing interference, in conventional mean filter method, when there being interference
When pulse is scurried into, analog-digital converter is difficult to identify, can be using disturbing pulse as effectively in digital signal the most after conversion
Signal component, this will necessarily produce certain error.Therefore, mean filter method cannot remove noise, can only be at not half
On weaken interference signal impact.And median filtering method first continuous sampling n times (N takes odd number), and by n times sampled value by size
It is this virtual value that arrangement takes intermediate value, although this algorithm can effectively overcome the fluctuation interference caused because of accidentalia, can to temperature
The slowly varying signals such as degree, liquid level carry out good filter effect, but poor to fast varying parameters effect, still await changing
Enter.
Summary of the invention
The present invention is to solve existing long oil pipeline road Leak Detection and positioner is inaccurate and filter effect is not enough to
And the problem of dispatch from foreign news agency supply bottleneck out of office, and provide a kind of long oil pipeline road leak detecting device and detection method.
Long oil pipeline road leak detecting device includes: controller module, signal detection module and signal processing module；
Described controller module is provided with processor；
Described signal detection module includes sensor interface, signaling conversion circuit；
Described signal processing module includes signal front-end processing circuit and reference voltage circuit；Described signal processing module
One end connects with described signal detection module, for receiving detection signal from described signal detection module；Described signal processing mould
The other end of block is connected with described controller module, the signal after processing to described controller module transmission.
Long oil pipeline road leakage detection method, including:
Step one: be divided into N group to carry out continuous filtering the signal after A/D changes, takes i digital signal the most successively and makees
It is one group, and i the signal descending to each group；
Step 2: minimum signal is rejected from each group, and the signal of rejecting is saved in N+1 group, again to respectively
Group signal is estimated, signal calculated meansigma methods a againj, and each group signal error parameters ej；
Step 3: by each cell mean signal ajIt is sequentially placed in set A, by every grouping error parameter ejIt is sequentially placed into error
In set E, and the filtering estimated value that the parameter addition corresponding to each item in set A and set E obtains N group signal isConduit running pressure state is judged according to filtering estimated value.
The solution have the advantages that, by arranging solar panel, the uninterrupted of power supply during field work can be realized
Supply, adaptability is higher；By arranging Signal sampling and processing circuit so that device has powerful capacity of resisting disturbance and hard
Part early stage filter capacity；Processing of digital signal uses the filtering method of estimation disturbing signal to judge again after rejecting, and makes calculating
Signal value more can stablize the running status reacting oil pipeline exactly, and making next step control action for detection device provides more
Data foundation reliably.
Accompanying drawing explanation
Fig. 1 is the structural representation of the long oil pipeline road leak detecting device of the present invention；
Fig. 2 is the flow chart of the long oil pipeline road leakage detection method of the present invention；
Fig. 3 is signal detection module and the signal of long oil pipeline road one specific embodiment of leak detecting device of the present invention
The circuit structure diagram of processing module；
Fig. 4 is the circuit structure of the power module of long oil pipeline road one specific embodiment of leak detecting device of the present invention
Figure；
Fig. 5 is the circuit of the reference voltage circuit of long oil pipeline road one specific embodiment of leak detecting device of the present invention
Structure chart；
Fig. 6 is the circuit of the peripheral circuit socket of long oil pipeline road one specific embodiment of leak detecting device of the present invention
Structure chart；
Fig. 7 is that the GPRS module interface signal of long oil pipeline road one specific embodiment of leak detecting device of the present invention is inserted
The circuit structure diagram of seat；
Fig. 8 is the circuit of the condition prompting circuit of long oil pipeline road one specific embodiment of leak detecting device of the present invention
Structure chart；
Fig. 9 is the circuit structure of the crystal oscillating circuit of long oil pipeline road one specific embodiment of leak detecting device of the present invention
Figure；
Figure 10 is the circuit of the controller module of long oil pipeline road one specific embodiment of leak detecting device of the present invention
Structure chart；
Detailed description of the invention
Detailed description of the invention one: as it is shown in figure 1, the long oil pipeline road leak detecting device of present embodiment, including: control
Device module 130, power module 140, signal detection module 110 and signal processing module 120；
Described controller module 130 is provided with processor, and described processor connects crystal oscillating circuit, reset circuit, condition prompting
Circuit and peripheral interface socket；
Described power module 140 include solar panel interface circuit, lithium battery charging circuit, charge protector,
Power supply automatic switchover circuit and voltage are changed and mu balanced circuit；Described power module is connected with described controller module, is used for
Power supply is provided for described controller module；
Described signal detection module 110 includes sensor interface, signaling conversion circuit；
Described signal processing module 120 includes signal front-end processing circuit and reference voltage circuit；Described signal processing mould
One end of block connects with described signal detection module, for receiving detection signal from described signal detection module；At described signal
The other end of reason module is connected with described controller module, the signal after processing to described controller module transmission.
Detailed description of the invention two: present embodiment is unlike detailed description of the invention one: peripheral interface socket includes control
Signal plug processed, sensor signal socket and GPRS module interface signal socket.
The benefit so arranged is, by arranging multiple interfaces socket, to enhance the extensibility of device.
Other step and parameter are identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment is unlike detailed description of the invention one or two: solar panel connects
Mouth circuit is connected with solar panel, and described solar panel interface circuit is provided with power output end and luminous energy quality letter
Number end, described solar panel is software cell panel.
So arrange benefit be, by arrange solar panel make device can with during field work power supply not between
Cut-off is answered, and adaptability is higher.
Other step and parameter are identical with detailed description of the invention one or two.
Detailed description of the invention four: present embodiment is unlike one of detailed description of the invention one to three: sensor interface
For connecting sensor, described sensor is 6 pressure wave sensors, is arranged on the outer surface of oil pipeline, and oil pipeline is horizontal
A pressure wave sensor is installed every 60 degree in the outer in cross section.
The benefit so arranged is that 6 pressure wave sensors can cover pipe circumference about 80% area under light illumination, easily
Illumination is accepted in multi-angle large area.Solar panel is the most just made to play one's part to the full so that it is can provide for device
A large amount of electric energy.
Other step and parameter are identical with one of detailed description of the invention one to three.
Detailed description of the invention five: present embodiment is unlike one of detailed description of the invention one to four: signal conversion electricity
Road uses LTC6362 chip.
Other step and parameter are identical with one of detailed description of the invention one to four.
Detailed description of the invention six: present embodiment is unlike one of detailed description of the invention one to five: front-end processing electricity
Road uses LTC2380-24 chip, and LTC2380-24 chip is connected with the outfan of LTC6362 chip；Front-end processing circuit is used for
The analog-digital conversion data of sensor signal is carried out hardware mean filter.
Other step and parameter are identical with one of detailed description of the invention one to five.
Detailed description of the invention seven: present embodiment is unlike one of detailed description of the invention one to six: front-end processing electricity
It route 6 groups of LTC2380-24 chip circuit compositions, by 14 pins of previous LTC2380-24 chip and later LTC2380-
12 pins of 24 chips connect, and sequentially form the connected in series of 6 chips.
Other step and parameter are identical with one of detailed description of the invention one to six.
Detailed description of the invention eight: as in figure 2 it is shown, present embodiments provide for a kind of long oil pipeline road leakage detection method,
Including:
Step one: be divided into N group to carry out continuous filtering the signal after A/D changes, takes i digital signal the most successively and makees
It is one group, and i the signal descending to each group；
Step 2: minimum signal is rejected from each group, and the signal of rejecting is saved in N+1 group, again to respectively
Group signal is estimated, signal calculated meansigma methods a againj, and each group signal error parameters ej；
Step 3: by each cell mean signal ajIt is sequentially placed in set A, by every grouping error parameter ejIt is sequentially placed into error
In set E, and the filtering estimated value that the parameter addition corresponding to each item in set A and set E obtains N group signal isConduit running pressure state is judged according to filtering estimated value.
Detailed description of the invention nine: present embodiment is unlike detailed description of the invention eight: signal averaging ajForDescribed signal error parameters ejFor1≤i
≤ 100,1≤j≤i-1；Described set A and set E is A={a1 a2 ... aNAnd E={e1 e2 ... eN}；Described every
Filtering estimated value is
Other step and parameter are identical with detailed description of the invention eight.
Detailed description of the invention ten: present embodiment is unlike detailed description of the invention eight or nine: according to filtering estimated value
The detailed process judging conduit running pressure state is:
Step 3 one: ifBefore and after calculating, the absolute difference of adjacent two data is i.e.
Number of times whether more than N/2 time, if exceeding, then judge pipeline occur leakage, if not less than, then judge pipeline do not occur leakage；
Described ε1For manifold pressure wave attenuation speed, 1≤m≤N；
Step 3 two: ifInterior data occur with intermittent irregular form, with i signal are
One group, gather the data that N group is new altogether, and calculate the filtering estimated value made new advancesExtraction should
Minima in group dataAnd meansigma methodsIfThen judge that leakage occurs in pipeline, otherwise judges do not occur
Leakage；
Described minima Meansigma methods isη is approximation pressure reduction.
<embodiment 1>
As shown in Figures 3 to 10, this long oil pipeline road leak detecting device is provided with controller mould to embodiment of the present invention circuit
Block, power module, signal detection module, signal processing module；Controller module is provided with processor, processor connects crystal oscillator electricity
Road, reset circuit, condition prompting circuit, and peripheral signal interface socket, these sockets include control signal, sensor signal
And GPRS module interface signal；Crystal oscillating circuit uses the crystal oscillator of 27.12MHz, the 18pF electric capacity that two ends connect, crystal oscillator two simultaneously
End provides the clock cycle for processor after being connected with PIO0_8 and the PIO0_9 pin of LPC812M processor respectively；Reset circuit
In be directly directly connected with processor pin 4 after the resistance pull-up of 3.3V unidirectional current one 5.1K of series connection, i.e. realize processor
Automatically reset after powering on；Condition prompting circuit is to be connected with 3.3V power supply and 820 Ω resistance respectively at light-emitting diode two ends,
After current limliting, the PIO0_11 pin with processor is connected, during use processor to this pin send low level signal can light send out
Optical diode, it is achieved the prompting of running status, it is possible to give obstructed prompting implication to it by controlling glow frequency.
In peripheral signal socket 1 to 8 pin of GPRS module respectively with the PIO0_17 of processor, PIO0_3, PIO0_4,
PIO0_13, PIO0_2, PIO0_0, PIO0_6 corresponding with PIO0_4 pin connect, during use processor by this interface to GPRS
Send accessing time sequence signal, it is achieved the wireless receiving of data and transmission；In peripheral signal socket the 1-3 pin of JP19 respectively with
PIO0_1, PIO0_15 and PIO0_7 pin of processor connects, simultaneously pin PIO0_1 also with solaode in power module
Pin 3 (i.e. test) pin of plate interface unit JP6 connects, and during use, processor is by detection PIO0_9 leg signal state,
Judge the solar panel quality of power supply, in order to make the action of power supply switching exactly.
It is automatic that power module is provided with solar panel interface unit, lithium battery charging circuit, charge protector, power supply
Switching circuit, multiple voltage conversion-mu balanced circuit；Described solar panel interface circuit is connected with solar panel, should
Solar panel is software cell panel, can surface mount in oil pipeline outer rim, cover under exposed tube with illumination at least
80% area, it is easy to multi-angle large area accepts illumination；The power output end pin 1,2 of this circuit interface JP6 respectively with relay
Two pins of the upper end of device K1 connect, and power output end pin 1 is also connected with 0 resistance R35 one end of lithium battery charging circuit,
The other end of this resistance is connected with the pin 8 and 4 of 0.01pF filter capacitor C25 and chip TP4056 respectively, and using 8 pins is energy
Chip operation, and introduced charging chip circuit by 4 pins, starting lithium battery is charged, processor is by accessing lithium battery
The LPC_tem pin of circuit obtains charging circuit temperature, indirectly judges charging circuit duty；Fill to prevent excess
Electrical phenomena, is connected the pin 5 of chip TP4056 with the pin 5 of DW01 chip in power supply automatic switchover circuit, chip simultaneously
The pin 3,1 of DW01 4,6 pins with the GTT8205S of chip respectively connect, and chip GTT8205S can realize overcurrent here
With overvoltage protection effect, it is possible to automatically cut off charging circuit at balance of voltage state platform, from being dynamically connected in the case of unbalance
Charging circuit, for lithium cell charging；Power supply automatic switchover circuit is by after 100 Ω resistance current limlitings by the pin 5 of chip DW01
Being connected with another pin of relay, the coil of relay controls end LPC_turn and is connected with the pin PIO0_15 of processor, uses
Time, processor sends high level signal then relay coil Guan Bi to this pin, and now lithium battery is as power source, if to this
Pin sends low level signal then relay coil and opens, and now solar energy is as power source, actually used in white when being in
It time be actively switched to solar powered state, the most solar powered interface, for lithium cell charging, then uses night
Lithium battery power supply；In multiple voltage conversion-mu balanced circuit by access 12V unidirectional current through 0.33uF ceramic disc capacitor filter after with
The pin 1 of voltage stabilizing chip LM7805 connects, and the 5V voltage obtained after this chip transformation has pin 3 to export, simultaneously in order to obtain
Obtain 3.3V DC voltage, the pin 3 of LM7805 is connected with chip SX2106 pin 5, by drawing after SX2106 chip processes
Foot 6 is connected 4.7uH inductance, is further continued for after resistance-capacitance network realizes High frequency filter obtaining stable 3.3V voltage, subsequently
This voltage, as the input of chip ASM1117-2.5, obtains 2.5V voltage after overvoltage is changed；
Signal detection module is provided with sensor interface, signaling conversion circuit, signal processing module；Described sensor is pressure
Wave sensor, has 6 pressure wave sensors, is mounted on the outer surface of oil pipeline in the present invention, with a certain cross section of pipeline
Outer rim every 60 degree, a pressure wave sensor is uniformly installed；Described signaling conversion circuit uses LTC6362 chip to be used for believing
Number level conversion and reduce power consumption.Described signal processing module is provided with signal front-end processing circuit and reference voltage electricity
Road, front-end processing circuit uses LTC2380-24, and this chip is connected with the outfan of LTC6362 chip, it is achieved believe sensor
Number analog digital conversion and hardware mean filter；Simultaneously in order to meet the process of 6 pressure wave sensor signals, the present invention has 6
Group LTC2380-24 chip circuit composition, by 14 pins i.e. SDO signal and the later of previous LTC2380-24 chip in circuit
The i.e. RDL/SDI of 12 pins of LTC2380-24 chip connects, and is sequentially completed the connected in series of 6 chips；Described reference voltage electricity
Road uses LTC6655 chip to provide reference voltage for signal processing circuit and signal detection module.
The signal filtering method of long oil pipeline road leak detecting device, it is contemplated that oil pipeline is revealed process and first be there will be
There is the change of concussion property in manifold pressure ripple, will enter the stable decline of pressure wave subsequently or compare under non-leak condition
Pressure wave number is lower；It is thus desirable to one reliably signal filtering method guarantees that long oil pipeline road leak detecting device avoids it to go out
Existing error detection.First signal after A/D changes is divided into N group to carry out continuous filtering by this filtering method, will front i number
Word signal is as the 1st group, and by i signal descending in this group, is then rejected from this group by minimum signal, and should
Rejecting signal and be saved in N+1 group, be again estimated the 1st group of signal, evaluation process is as follows:
In assuming new the 1st group, signal is respectively as follows: X1={ x1,1 x1,2 ... x1,i-1, then signal calculated meansigma methods A1,
And this group signal error parameters e1, wherein
In like manner, after the 2nd group of signal rejects minima, and the 2nd group of rejecting signal is saved in N+1 group, again to the 2nd group
Signal is estimated.
In assuming new the 2nd group, signal is respectively as follows: X2={ x2,1 x2,2 ... x2,i-1, then signal calculated meansigma methods a2,
And this group signal error parameters e2, wherein
Each for acquisition cell mean signal by that analogy, is finally sequentially placed in set A, will often organize by mistake by remaining N-2 group
Difference parameter is sequentially placed in error set E；Therefore there is A={a1 a2 ... aN}；E={e1 e2 ... eN}；Now by A and E
In parameter corresponding to each item be added i.e.Then obtain the filter of N number of signal
Ripple estimated value isAnd using this as the foundation judging pipeline pressure state, and then judge that pipeline is transported
Row situation.
If now occurring significantlyThen illustrate that now oil pipeline occurs in that leak condition, further
Ground is by the absolute difference of adjacent two data before and after calculating i.e.Number of times whether more than N/2 time, ε here1For
State parameter, takes 0.1MPa；Represent manifold pressure wave attenuation speed, indirectly reflect pipeline leakage degree；Parameter 1≤m
≤N。
IfInterior data occur with intermittent irregular form, then need to determine whether, now
Continue to gather new data, be to be one group with i signal equally, gather N group data, and the filtering estimated value that calculating makes new advances altogetherThe minima taken out in these group data i.e. calculatesAnd
Meansigma methods i.e.IfThen there is leakage in explanation pipeline, is otherwise considered as properly functioning, here parameter η
=0.25MPa, for approximation pressure reduction.
The present invention can realize the uninterrupted supply of power supply during field work, and adaptability is higher；Signal sampling and processing circuit
There is powerful capacity of resisting disturbance and hardware early stage filter capacity；The process of the numeral of signal and judgement use interference signal to pick
Except judging filtering method again, make the signal value of calculating more can react the running status of oil pipeline, for detection dress smooth steady
Put and next step control action offer more reliable data foundation is provided.
Claims (10)
1. a long oil pipeline road leak detecting device, it is characterised in that including: controller module, signal detection module and letter
Number processing module；
Described controller module is provided with processor；
Described signal detection module includes sensor interface, signaling conversion circuit；
Described signal processing module includes signal front-end processing circuit and reference voltage circuit；One end of described signal processing module
Connect with described signal detection module, for receiving detection signal from described signal detection module；Described signal processing module
The other end is connected with described controller module, the signal after processing to described controller module transmission.
A kind of long oil pipeline road the most according to claim 1 leak detecting device, it is characterised in that described processor connects
Crystal oscillating circuit, reset circuit, condition prompting circuit and peripheral interface socket；
Described peripheral interface socket includes control signal socket, sensor signal socket and GPRS module interface signal socket.
A kind of long oil pipeline road the most according to claim 1 leak detecting device, it is characterised in that described device also includes
Power module, described power module includes solar panel interface circuit, lithium battery charging circuit, charge protector, electricity
Source automatic switch-over circuit and voltage are changed and mu balanced circuit；Described power module is connected with described controller module, be used for be
Described controller module provides power supply；
Described solar panel interface circuit is connected with solar panel, and described solar panel interface circuit is provided with electricity
Source output terminal and luminous energy quality signal end, described solar panel is software cell panel.
A kind of long oil pipeline road the most according to claim 3 leak detecting device, it is characterised in that described sensor interface
For connecting sensor, described sensor is 6 pressure wave sensors, is arranged on the outer surface of oil pipeline, and oil pipeline is horizontal
A pressure wave sensor is installed every 60 degree in the outer in cross section.
A kind of long oil pipeline road the most according to claim 4 leak detecting device, it is characterised in that described signal conversion electricity
Road uses LTC6362 chip.
A kind of long oil pipeline road the most according to claim 5 leak detecting device, it is characterised in that described front-end processing electricity
Road uses LTC2380-24 chip, and LTC2380-24 chip is connected with the outfan of LTC6362 chip；Described front-end processing circuit
For the analog-digital conversion data of sensor signal is carried out hardware mean filter.
A kind of long oil pipeline road the most according to claim 6 leak detecting device, it is characterised in that described front-end processing electricity
It route 6 groups of LTC2380-24 chip circuit compositions, by 14 pins of previous LTC2380-24 chip and later LTC2380-
12 pins of 24 chips connect, and sequentially form the connected in series of 6 chips.
8. a detection method based on the long oil pipeline road leak detecting device described in any one in claim 1 to 7, its
Being characterised by, described method includes:
Step one: be divided into N group to carry out continuous filtering the signal after A/D changes, take i digital signal the most successively as one
Group, and i the signal descending to each group；
Step 2: minimum signal is rejected from each group, and the signal of rejecting is saved in N+1 group, again each group is believed
Number it is estimated, signal calculated meansigma methods a againj, and each group signal error parameters ej；
Step 3: by each cell mean signal ajIt is sequentially placed in set A, by every grouping error parameter ejIt is sequentially placed into error set E
In, and parameter corresponding to each item in set A and set E is added obtains the filtering estimated value of N group signal and beConduit running pressure state is judged according to filtering estimated value.
Method the most according to claim 8, it is characterised in that described signal averaging ajForDescribed letter
Number error parameter ejFor1≤i≤100,1≤j≤i-1；Institute
Stating set A and set E is A={a1 a2 ... aNAnd E={e1 e2 ... eN}；Described every filtering estimated value is
Method the most according to claim 9, it is characterised in that described according to filtering estimated value judge conduit running pressure
The detailed process of state is:
Step 3 one: ifBefore and after calculating, the absolute difference of adjacent two data is i.e.Time
Whether number is more than N/2 time, if exceeding, then judges that leakage occurs in pipeline, if not less than, then judge that leakage does not occurs in pipeline；Described
ε1For manifold pressure wave attenuation speed, 1≤m≤N；
Step 3 two: ifInterior data occur with intermittent irregular form, are one group with i signal,
Gather the data that N group is new altogether, and calculate the filtering estimated value made new advancesExtract this group data
In minimaAnd meansigma methodsIfThen judge that leakage occurs in pipeline, otherwise judges leakage do not occur；
Described minima Meansigma methods isη is approximation pressure reduction.
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| CN106594526A (en) * | 2016-12-02 | 2017-04-26 | 中国科学院上海微系统与信息技术研究所 | Water supply network condition monitoring method and water supply network condition monitoring device based on water pressure sampling data |
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|---|---|---|---|---|
| CN106594526A (en) * | 2016-12-02 | 2017-04-26 | 中国科学院上海微系统与信息技术研究所 | Water supply network condition monitoring method and water supply network condition monitoring device based on water pressure sampling data |
| CN110646682A (en) * | 2019-09-23 | 2020-01-03 | 辽宁工程技术大学 | System for monitoring interference potential of metal buried pipeline in real time |
| CN110646682B (en) * | 2019-09-23 | 2021-06-22 | 辽宁工程技术大学 | System for monitoring interference potential of metal buried pipeline in real time |
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| CN106090631B (en) | 2018-01-23 |
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