CN207908706U - A kind of detecting metal pipeline system based on time domain electromagnetic method - Google Patents
A kind of detecting metal pipeline system based on time domain electromagnetic method Download PDFInfo
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- CN207908706U CN207908706U CN201820254377.3U CN201820254377U CN207908706U CN 207908706 U CN207908706 U CN 207908706U CN 201820254377 U CN201820254377 U CN 201820254377U CN 207908706 U CN207908706 U CN 207908706U
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Abstract
The utility model discloses a kind of detecting metal pipeline systems based on time domain electromagnetic method, it is with proximal end, distal attachment points, including transmitter, send connecting line, measuring machine and reception device, the system has a rectangular detection area, short side and target pipeline substantially move towards vertical, long side and target pipeline substantially move towards parallel；The proximal connection point is located at dew point at the one of target pipeline, corresponding with a vertex in rectangular detection area；Distal attachment points are located at the rectangular detection area vertex adjacent with proximal connection point；The transmission connecting line is laid on the side of detecting area；The reception device is connected with measuring machine by mounting bracket, and before detection, measuring machine sets ginseng with transmitter clock synchronization；The utility model has the advantage of be directly accessed target pipeline section to be measured to send circuit, ensure that excitation field source is applied on target pipeline to the maximum extent, response signal is stronger and can reduce side electromagnetic interference, while can treat test tube line and be accurately positioned, oriented and continuously tracked.
Description
Technical field
The utility model belongs to Geophysical technique field, and in particular to a kind of metal pipe line spy based on time domain electromagnetic method
Examining system.
Background technology
Underground utilities are the important infrastructure in city and " lifeline ", and the development construction in city and management are to underground utilities
Detection demand it is increasingly prominent；City Buried Pipeline type is various, and substantial amounts, material are various, and laying technology differs, and often wants
Ground structures, highway, railway and river etc. are passed through, landforms, landform, soil property of process etc. are complicated and changeable, especially for depth
Buried pipeline mostly uses trenchless installation technology, and buried depth and variation range are big, and usual tube top buried depth is more than 3 meters, and local buried depth reaches
Ten meters even tens meters, pipeline distance, track are uncertain big, this just improves the Detection Techniques of underground utilities higher
It is required that.
Geophysical prospecting method has the characteristics that economical, efficient, lossless, played an important role in terms of pipeline detection.At present
Commonly used geophysical prospecting method is frequency domain electromagnetic methods, i.e. pipeline instrument method, to the metal pipe line positioning accuracy within 3 meters of buried depth compared with
Good, efficiency is higher, but effective depth is shallower, is unsuitable for detecting for deep-buried pipeline, while anti-interference ability is weak, easily by humane around
Electromagnetic interference especially Hz noise influences；Time domain electromagnetic method (or transient electromagnetic method) is in underground utilities, bad in recent years
It is taken seriously in terms of the fine detection such as geologic body, underground obstacle and develops into hot spot, for underground pipeline detection, have and visit
The advantage that depth measurement degree is big, horizontal location effect is preferable, efficient, at low cost, since usual manner is carried out using the small coil of multiturn
Contactless field source is excited and is received, and early signal is distorted by primary field serious interference and can only utilize late period two in measuring signal
Secondary field signal, it is inaccurate to exist simultaneously line depth positioning, by side metal serious interference, and be adapted only to section survey and be difficult into
Row pipeline is tracked, these factors constrain application of the time domain electromagnetic method in terms of pipeline accurately detecting.
Utility model content
The technical problem to be solved by the utility model is to：Frequency domain electromagnetic methods investigation depth is shallower, it is difficult to buried
Metal pipe line is effectively detected, and anti-interference ability is weak, and measuring signal is influenced by the especially Hz noise of electromagnetic interference around；Often
It advises and is excited using contactless field source in the detection of time domain electromagnetic method, often cause early signal distortion that cannot utilize, using this method
It is easily influenced by the interference of side metal and people around's message magnetic disturbance in Underground metal pipe line, while detection accuracy is relatively low
Especially cannot accurate depthkeeping, it is more prominent for deep-buried pipeline, and be difficult to continuously track target pipeline to be measured.
The utility model solves above-mentioned technical problem using following technical scheme：
A kind of detecting metal pipeline system based on time domain electromagnetic method should with proximal connection point and distal attachment points
System includes transmitter, sends connecting line, measuring machine and reception device, which there is rectangular detection area, the rectangle to visit
The short side for surveying area is vertical with the substantially trend of target pipeline, and long side substantially moves towards parallel with target pipeline；The proximal end connection
Point dew point, dew point at the one of target pipeline is corresponding with a vertex in rectangular detection area；The distal end connection
Point is located at the rectangular detection area vertex adjacent with proximal connection point；The transmission connecting line is laid on the side in rectangular detection area,
It includes proximal end connecting line and distal end connecting line to send connecting line, and proximal end connecting line both ends are connect with transmitter, proximal end respectively
Point connection, the both ends of the distal end connecting line are connect with transmitter, distal attachment points respectively；The measuring machine is logical with reception device
Mounting bracket is crossed to be connected and fixed,；The measuring machine sets ginseng with transmitter using time synchronizing method；The transmitter is internally provided with
The impedance matching module being connected with sending module, and output bipolarity recurrent pulse exciting current outward.
Impedance matching module sends circuit with outside and connect, and setting purpose is that circuit, realization is protected to send back roadlock
Anti- automatic adjusument so that excitation field source is more stable.
Preferably, a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model, the distal end
Tie point is located at another place dew point of target pipeline, and distal end connecting line, proximal end connecting line and target pipeline section to be measured enclose
It is rectangular, and meet L >=6d ', W >=3d ' between its long side L, short side W and the doubtful buried depth d ' of target pipeline.
Preferably, a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model, the proximal end
Connecting line and the perpendicular linear laying substantially moved towards in target pipeline of distal end connecting line, the distal attachment points are located at distal end
At endpoint of the connecting line far from transmitter, distal end connecting line enters the earth, proximal connection point and distal attachment points by being grounded brazing filler metal
Line constitute the short side W in rectangular detection region, and meet W >=3d ' between the doubtful buried depth d ' of target pipeline.
Circuit is sent by accessing target pipeline, forms larger current loop, and exciting current directly applies
Onto metal pipe line to be measured, the timely domain measurement of electrical source forcing is carried out, is synchronized by reception device and measuring machine and receives and processes letter
Number, which contains exciting current shutdown and causes the field signal generated and secondary field signal, wherein a field signal is dominant
And it is directly related with object to be measured pipeline, useful signal response is strong, measurement accuracy higher, in addition proximal end, distal attachment points and hair
It send the setting of connecting line to must satisfy certain condition, even avoids sending electricity caused by connecting line break-make electric process to weaken
Magnetic disturbance.
Preferably, a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model, it is described bipolar
The frequency f of sexual cycle pulse excitation electric currenttxWith 50Hz or 60Hz power frequencies fpfRelationship be ftx=2nfpf, (n=1,2,
3...) or
The waveform of the bipolarity recurrent pulse exciting current is square wave, trapezoidal wave or triangular wave.
Preferably, a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model, it is described bipolar
The duty ratio of sexual cycle pulse excitation electric current is 0.25-0.75；Further preferably 0.5.
Preferably, a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model, it is described bipolar
Property square-wave pulse exciting current after along the turn-off time be nanosecond, be along the turn-off time after bipolarity trapezoidal wave pulse excitation electric current
Microsecond grade along the turn-off time is Microsecond grade or Millisecond after bipolarity triangular pulse exciting current.
Bipolarity periodic square wave or trapezoidal wave are instantaneous shutdown, have extremely strong fillip, are suitable for over long distances
And the detection of great burying metal pipe line, and Phase Stacking can be carried out in data processing, to filter out various interference especially
Hz noise and random disturbances improve investigation depth and accuracy.
Preferably, a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model, the reception
Device is built-in with upper end horizontal component magnetic field sensor and lower end horizontal component magnetic field sensor, and upper end horizontal component magnetic field passes
The technical parameter of sensor and lower end horizontal component magnetic field sensor, performance indicator and installation position all same.
Preferably, a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model, the upper end
It is equipped with vertical component magnetic field sensor between horizontal component magnetic field sensor and lower end horizontal component magnetic field sensor, is waited for auxiliary
Test tube line quick and precisely horizontal location.
Preferably, a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model, the upper end
Horizontal component magnetic field sensor, lower end horizontal component magnetic field sensor and vertical component magnetic field sensor are hollow coil or magnetic
Dependent sensor.
In addition, the shell and mounting bracket of the shell of the measuring machine, reception device use non-magnetic insulating material, and pacify
It shelves top middle portion and can also be used as handle use；
A kind of above-mentioned detecting metal pipeline systematic difference method method based on time domain electromagnetic method, includes the following steps：
(1) transmitter is laid in detecting area periphery, transmitter and proximal connection point is connected by proximal end connecting line, passed through
Distal end connecting line connection transmitter and distal attachment points, and set a plurality of section that vertical and coverage goal pipeline substantially moves towards and survey
Line；
(2) transmitter and measuring machine are set time and are set ginseng, major parameter include pulse current waveform, pulse frequency,
Sending cycle and output power；
(3) reception device and measuring machine are moved integrally, so that its ground proximity is moved successively along each section survey line and measures；
When measurement, upper end horizontal component magnetic field sensor is substantially walked with lower end horizontal component magnetic field sensor sensitive direction with target pipeline
To vertical；
(4) horizontal location and depthkeeping of pipeline obtains the central horizontal position of metal target pipeline according to measuring signal analysis
It sets, and the accurate center buried depth of target pipeline is further calculated.
Being accurately positioned, orient and continuously tracking to target pipeline to be measured is realized accordingly.
The section survey line cross over target pipeline both sides, meet between length W' and the doubtful buried depth d ' of target pipeline W ' >=
D ', and meet W '≤W/3 between rectangular detection area short side W, minimum of the section survey line away from proximal connection point and distal attachment points
Meet L ' >=2d ' between horizontal distance L' and the doubtful buried depth d ' of target pipeline.
The measuring machine measures and recording impulse electric current rises and closes to the time domain response signal in the phase of gap, and wherein emphasis records
The field signal generated during switch off current.
Step (4) the metal target pipeline horizontal location and the method for depthkeeping are：It is mutually co-extensive for a certain section survey line
The peak value or vertical component of the measuring signal of slow moment upper end horizontal component magnetic field sensor, lower end horizontal component magnetic field sensor
The valley of magnetic field sensor measuring signal corresponds to the horizontal distribution position of metal target pipe center, then by upper end horizontal component magnetic
Field sensor, the peak computational at lower end horizontal component magnetic field sensor same delay moment obtain the accurate buried depth d of target pipeline,
Calculation formula is
Wherein, Mc1、Mc2The peak value that respectively upper end, lower end horizontal component magnetic field sensor measure at the same delay moment
Signal, when using hollow coil, M indicates voltage, and when using magneto-dependent sensor, M indicates magnetic induction intensity, roFor air core coil
The spacing of the magneto-dependent sensor and ground of radius or lower end, l are upper end horizontal component magnetic field sensor and lower end horizontal component magnetic
The center spacing of field sensor.
The principle and process of technical solutions of the utility model progress metal pipe line positioning measurement are as follows：
According to Biot-Savart law, for endless Long Straight Current-carrying conducting wire, the magnetic strength at its surrounding space any point
It is B=μ to answer intensityoI/2 π r, r is space point hanging down away from μ o are space permeability, and I is energization to Long Straight Current-carrying conducting wire in formula
Electric current；When powering to metal pipe line to be measured its can approximation regard an electromotion straight wire as, due to B ∝ 1/r, when mono- timings of I, according to
Technical solutions of the utility model are when ground carries out section positioning measurement, same delay moment t0, corresponding B at r minimum positions
Most strong, i.e. the corresponding ground location point of pipe center (is denoted as x0) at B it is most strong, keep horizontal component magnetic field sensor sensitivity side
To substantially moving towards vertical with target pipeline, so that it may to think t0The B values that moment measures are maximum value, thus a certain section is surveyed
Line just can determine the level of pipe center to be measured according to the peak value of same delay moment horizontal component magnetic field sensor measuring signal
Distributing position.
The utility model technology advantageous effect：
Object to be measured pipeline is directly accessed using transmission connecting line in technical solutions of the utility model and sends circuit, is formed
One larger current loop, and exciting current is applied directly on metal pipe line to be measured, is carried out using time domain electromagnetic method
Electrical source forcing and measurement, are synchronized by reception device and measuring machine and receive and process signal, which contains exciting current shutdown
Cause the field signal generated and secondary field signal, wherein a field signal is dominant, and makes a field signal and target tube
Line is directly related, thus carries out positioning analysis and calculating using a field signal, useful signal response is strong, and measurement accuracy is more
It is high；
Since electric current is generally conducted along impedance minimal path, ensure that excitation field source is applied to target pipeline to the maximum extent
On, stronger response signal can be obtained, and the interference of side metal can be reduced；
Two horizontal component magnetic field sensors are used in reception device, are more suitable for detecting feeble field signal, be ensure that sensitivity side
To the Best Coupling state with target pipeline, horizontal position and buried depth that stronger response signal is more conducive to pipeline are directly acquired
Precise positioning；
Impedance matching module built in transmitter realizes the automatic adjusument for sending impedance loop, steadily output drive field
Source, while the protective effect to circuit is played, flexibility and applicability greatly enhance；
Field source excitation is carried out using bipolarity recurrent pulse exciting current, positive-negative polarity excitation can be carried out, is observed by swashing
Encourage time domain response signal caused by switch off current, information more horn of plenty；Due to mainly observing after electric current along pass to pulse interval
A response signal especially field signal in phase, signal response is stronger more stable, has directly reacted the space point of target pipeline
Cloth；It is derived from the frequency of drive pulse current and the relationship of power frequency by calculating, digital signal is carried out by Phase Stacking
Processing, can effectively suppress the influence of power frequency, random disturbances and direct current biasing, greatly improve signal-to-noise ratio；In addition, use side
Wave or trapezoidal wave impulse, rapidly switch off shutdown, and fillip is stronger, are more suitable for the detection of long range metal pipe line；
The laying mode of the measurement method clear stipulaties of the technical program system and positioning measurement mode provide transmission and connect
The laying requirement of wiring and the requirement of section survey line, improve the confidence level and accuracy of measurement result；
Metal pipe line can not only be quickly accurately positioned, oriented using time domain electromagnetic method, additionally it is possible to which pipeline is connected
Continuous tracking, greatly improves efficiency, has saved manpower and economic cost, breach conventional geophysical prospecting method, when especially traditional
Bottleneck of the domain electromagnetic method in pipeline detection, the meaning with technological innovation.
Description of the drawings
Fig. 1 is a kind of structure of detecting metal pipeline system based on time domain electromagnetic method described in the utility model embodiment
Schematic diagram；
Fig. 2 is another structural schematic diagram of the reception device described in the utility model embodiment；
Fig. 3 is a kind of the first detection of metallic pipeline system based on time domain electromagnetic method described in the utility model embodiment
Method schematic diagram；
Fig. 4 is second of a kind of detecting metal pipeline system based on time domain electromagnetic method described in the utility model embodiment
Detection method schematic diagram.
In figure：1- transmitters, 2- send connecting line, and the proximal ends 21- send connecting line, and the distal ends 22- send connecting line, and 31- is close
Tie point, 32- distal attachment points, 4- is held to be grounded pricker, 5- measuring machines, 6- reception devices, the upper ends 61- horizontal component magnetic field sensing
Device, the lower ends 62- horizontal component magnetic field sensor, 63- vertical component magnetic field sensors, 7- mounting brackets, 8- section surveys line.
Specific implementation mode
For ease of those skilled in the art understand that technical solutions of the utility model, new to this practicality in conjunction with Figure of description
Type technical solution is described further.
Refering to fig. 1, the utility model embodiment provides a kind of detecting metal pipeline system based on time domain electromagnetic method, should
There are two tie points, respectively proximal connection point 31 and distal attachment points 32 for detection system tool；Detection system include transmitter 1,
Connecting line 2, measuring machine 5 and reception device 6 are sent, transmitter 1 is connect with two tie points respectively by sending connecting line 2,
Middle proximal connection point 31 is located at target pipeline at dew point at the one of transmitter 1, and distal attachment points 32 are located at rectangular detection
The area vertex adjacent with proximal connection point 31；Target pipeline section access to be measured is sent into circuit by this method, and passes through reception
Device 6 is matched with measuring machine 5, and observation drive pulse current, which rises, closes to the time domain response signal in the inter-train pause phase, special
It is not the field signal that record current turn off process generates, directly carries out processing analysis using a field signal；Measurement process
In, transmitter 1 and measuring machine 5 work independently, but before detecting, need to set time between measuring machine 5 and transmitter 1 and synchronize set
Ginseng, clock synchronization with synchronize set there are many modes of ginseng, such as utilize serial port communication line, USB, WIFI, bluetooth etc..
When actual detection, transmitter 1 is laid in search coverage periphery, and search coverage is a rectangular area, sends connecting line 2
Connecting line 21 is sent including proximal end and distal end sends connecting line 22, and one end that proximal end sends connecting line 21 connect with transmitter 1, is another
One end is connect by coupling clip with proximal connection point 31, and the both ends that distal end sends connecting line 22 are separately connected transmitter 1, distally connect
Contact 32 connects；The reception device 6 is connected with measuring machine 5 by mounting bracket 7, and spaced apart with measuring machine 5, practical
When measurement, 7 top middle portion of mounting bracket is alternatively arranged as handle use.
As shown in Figure 1, a kind of structure of shown reception device 6 is：Reception device 6 is built-in with upper end horizontal component magnetic field biography
Sensor 61 and lower end horizontal component magnetic field sensor 62, and upper end horizontal component magnetic field sensor 61 and lower end horizontal component magnetic field
Technical parameter, performance indicator and the installation position all same of sensor 62.Pass through the joint of two horizontal component magnetic field sensors
Work, is conducive to improve the accuracy of detection to feeble field signal.
As shown in Fig. 2, quickly to carry out horizontal location to target pipeline, another structure of shown reception device 6 is：This
Vertical point is had additional between upper end horizontal component magnetic field sensor 61 in embodiment and lower end horizontal component magnetic field sensor 62
Magnetic field sensor 63 is measured, signal is measured by vertical component magnetic field sensor 63 to assist pipeline to be measured quick and precisely horizontal fixed
Position, upper end horizontal component magnetic field sensor 61, vertical component magnetic field sensor 63 and lower end horizontal component magnetic field sensor 62 are equal
The voltage signal ε (t) generated when measuring changes of magnetic field using hollow coil, or it is strong using magneto-dependent sensor measurement magnetic strength induction signal
Spend B (t).
Transmitter 1 is to export bipolarity recurrent pulse exciting current, the waveform of the bipolarity recurrent pulse exciting current
For square wave, trapezoidal wave or triangular wave, duty ratio 0.25-0.75, preferably 0.5, after bipolar square wave pulse excitation electric current
It is nanosecond along the turn-off time, along the turn-off time is Microsecond grade, bipolarity triangular wave after bipolarity trapezoidal wave pulse excitation electric current
Along the turn-off time it is Microsecond grade or Millisecond after pulse excitation electric current, exciting current shutdown is all instantaneous, has and extremely strong swashs
Ability is encouraged, the detection of long range and great burying metal pipe line is suitable for；The frequency f of bipolarity recurrent pulse exciting currenttxWith work
Frequency fpfThe relationship of (50Hz/60Hz) is ftx=2nfpf, (n=1,2,3...) orIts
It is realized to harmful effects such as Hz noise, random disturbances and direct current biasings using Phase Stacking when handling digital signal
Effective compacting.
In addition, being additionally provided with sending module in transmitter 1, the sending module is connected with impedance matching module, the resistance
Anti- matching module is connect with connecting line 2 is sent, and impedance matching module is used to send the automatic adjusument of impedance loop, plays stabilization
Export and protect the effect of circuit.
Based on the detecting metal pipeline system of above-mentioned time domain electromagnetic method, the present embodiment is there are two types of detection method, wherein the
A kind of detection method includes the following steps：
(1) transmitter 1 is laid, and transmitter 1 and proximal connection point 31 are connected by proximal end connecting line 21, by distally connecting
Wiring 22 connects transmitter 1 and distal attachment points 32, and sets the section that a plurality of vertical and coverage goal pipeline substantially moves towards and survey
Line 8；Wherein proximal connection point 31 is located at target pipeline close to the dew point of transmitter 1, and distal attachment points 32 are located at target pipeline
Another place dew point far from transmitter 1, between proximal end connecting line 21 and proximal connection point 31, distal end connecting line 22 with distally connect
It is connected by coupling clip 3 between point 32, proximal end connecting line 21 encloses square with distal end connecting line 22 and target pipeline section to be measured
Shape, wherein long side L substantially moves towards parallel, short side W with target pipeline and substantially moves towards vertical with target pipeline, and long side L, short side W
Meet L >=6d ', W >=3d ' between the doubtful d ' of target pipeline, 2 power on/off of connecting line is sent in the process to measuring generation to reduce
Electromagnetic interference；The section survey line crosses over target pipeline both sides, meets between length W' and the doubtful buried depth d ' of target pipeline
W ' >=d ', and meet W '≤W/3 between rectangular detection area short side W, section survey line away from proximal connection point, distal attachment points most
Meet L ' >=2d ' between small horizontal distance L' and the doubtful buried depth d ' of target pipeline；
(2) transmitter 1 set time with measuring machine 5 and synchronize set ginseng, major parameter includes pulse current waveform, pulse frequency
Rate, sending cycle and output power；It is preferential to select square-wave pulse to reduce pulse frequency when the buried depth of target pipeline is relatively large
Rate increases sending cycle, increases output power；
(3) reception device 6 and measuring machine 5 are moved integrally, so that its ground proximity is moved successively along section survey line 8 and is surveyed
Amount, when measurement, the sensitive direction and target of upper end horizontal component magnetic field sensor 61 and lower end horizontal component magnetic field sensor 62
Pipeline substantially moves towards vertical.
(4) horizontal location and depthkeeping of pipeline obtains the central horizontal position of metal target pipeline according to measuring signal analysis
It sets, and the accurate center buried depth of target pipeline is further calculated.
When measuring, system carries out field source excitation by sending circuit, with the 6 same stepping of measuring machine 5 and reception device
Row observational record and processing.For a certain section survey line, according to same delay moment toHorizontal component magnetic field sensor measures
The valley for the signal that the peak value or vertical component magnetic field sensor of signal measure determines the level minute of corresponding pipe center point
Cloth position (is denoted as xo), that is, according to hollow coil as magnetic field sensor, then have
ε(x,to)max=ε (xo,to)
Utilize same delay moment toThe peak value of upper end horizontal component magnetic field sensor, lower end horizontal component sensor leads to
Cross formula
In formula, εq1、εq2The induction that respectively upper end, lower end horizontal component magnetic field sensor measure at the same delay moment
Voltage peak signal, roFor air core coil radius, l is the center spacing of top and bottom horizontal component magnetic field sensor.
Calculate the center buried depth for providing pipeline automatically by measuring machine 5；
According to magneto-dependent sensor measuring signal, then have
B(x,to)max=B (xo,to)
Utilize same delay moment toThe peak value of upper end horizontal component magnetic field sensor, lower end horizontal component sensor leads to
Cross formula
In formula, Bc1、Bc2The magnetic strength that respectively upper end, lower end horizontal component magnetic field sensor measure at the same delay moment
Answer intensity peak signal, roFor the magneto-dependent sensor of lower end and the spacing on ground, l is top and bottom horizontal component magnetic field sensing
The center spacing of device.
Calculate the center buried depth for providing pipeline automatically by measuring machine 5；And being accurately positioned, calmly to target pipeline is realized with this
To and continuous tracking.
Difference lies in proximal end connecting line 21 and distal ends with the first detection method for second of detection method of the present embodiment
The perpendicular linear laying substantially moved towards in target pipeline of connecting line 22, the distal attachment points 32 are located at distal end connecting line
At 22 endpoints far from transmitter 1, distal end connecting line 22 is by being grounded the access the earth of pricker 4, the distal attachment points 32 and target
Pipeline hangs down away from meeting W >=3d ' between W and the doubtful buried depth d ' of target pipeline；Other actions and the first detection method are equal
Identical, details are not described herein again.
The principle and process of the utility model embodiment technical solution progress metal pipe line positioning measurement are as follows：
According to Biot-Savart law, for endless Long Straight Current-carrying conducting wire, the magnetic strength at its surrounding space any point
It is B=μ to answer intensityoI/2 π r, r is space point hanging down away from μ o are space permeability, and I is energization to Long Straight Current-carrying conducting wire in formula
Electric current；Metal pipe line can approximation regard an electromotion straight wire as, due to B ∝ 1/r, when mono- timings of I, according to the utility model technology
Scheme is when ground carries out section positioning measurement, same delay moment t0, corresponding B is most strong at r minimum positions, i.e. pipe center
Corresponding ground location point (is denoted as x0) at B it is most strong, keep magnetic field sensor sensitive direction it is vertical with target pipeline trend, just
It can consider t0The B values that moment measures are maximum value, thus measure letter according to same delay moment horizontal component magnetic field sensor
Number peak value determine the horizontal position of pipe center.
The center of upper end horizontal component magnetic field sensor 61 and lower end horizontal component magnetic field sensor 62 in reception device 6
Spacing is l, and the distance of radius or magneto-dependent sensor away from ground of hollow coil is r0, pipe center buried depth is d, dielectric permeability
μ=μrμo(μrFor relative permeability), when reception device 6 is close to ground right over target pipeline center, in pulse excitation electricity
I (t) is flowed afterwards along the delay moment t of shutdown0, when using magneto-dependent sensor, upper end horizontal component magnetic field sensor 61 measures signal
It is denoted as Bc1, lower end horizontal component magnetic field sensor 62 measures signal and is denoted as Bc2, then have
Two formula of simultaneous can acquire target pipeline center buried depth
When using hollow coil, upper end horizontal component magnetic field sensor 61 measures signal and is denoted as εq1, lower end horizontal component magnetic
Field sensor 62 measures signal and is denoted as εq2, then have
In formula, Φ is magnetic flux, and S is area coil, and four formula simultaneous can acquire the center buried depth of target pipelineBeing accurately positioned, orient and continuously tracking to target pipeline is realized accordingly.
Technical solutions of the utility model are exemplarily described utility model above in conjunction with attached drawing, it is clear that this practicality
Novel specific implementation is not subject to the restrictions described above, as long as using the methodology and technical solution progress of the utility model
Various unsubstantialities improve, or it is not improved the design of utility model and technical solution are directly applied into other occasions,
It both is within the protection scope of the present invention.
Claims (10)
1. a kind of detecting metal pipeline system based on time domain electromagnetic method, with proximal connection point and distal attachment points, this is
System includes transmitter, sends connecting line, measuring machine and reception device, which is characterized in that the system has rectangular detection area, institute
The short side for stating rectangular detection area is vertical with the substantially trend of target pipeline, and long side moves towards parallel with target pipeline；The proximal end
Tie point is located at dew point at the one of target pipeline, and the dew point is corresponding with a vertex in rectangular detection area；The distal end
Tie point is located at the rectangular detection area vertex adjacent with proximal connection point；The side for sending connecting line and being laid in rectangular detection area
On, it includes proximal end connecting line and distal end connecting line to send connecting line, and proximal end connecting line both ends connect with transmitter, proximal end respectively
Contact connects, and the both ends of the distal end connecting line are connect with transmitter, distal attachment points respectively；The measuring machine and reception device
It is connected and fixed in the transmitter by mounting bracket and is equipped with sending module, the sending module is connected with impedance matching module.
2. a kind of detecting metal pipeline system based on time domain electromagnetic method according to claim 1, which is characterized in that described
Distal attachment points are located at another place dew point of target pipeline, distal end connecting line, proximal end connecting line and target pipeline section to be measured
It encloses rectangular, and meets L >=6d ', W >=3d ' between its long side L, short side W and the doubtful buried depth d ' of target pipeline.
3. a kind of detecting metal pipeline system based on time domain electromagnetic method according to claim 1, which is characterized in that described
Proximal end connecting line is located at distal end with the perpendicular linear laying in target pipeline trend of distal end connecting line, the distal attachment points
At endpoint of the connecting line far from transmitter, distal end connecting line enters the earth, proximal connection point and distal attachment points by being grounded brazing filler metal
Line constitute the short side W in rectangular detection region, and meet W >=3d ' between the doubtful buried depth d ' of target pipeline.
4. according to a kind of detecting metal pipeline system based on time domain electromagnetic method of claim 1-3 any one of them, feature
It is, the transmitter exports bipolarity recurrent pulse exciting current, the frequency of the bipolarity recurrent pulse exciting current outward
Rate ftxWith 50Hz or 60Hz power frequencies fpfRelationship be ftx=2nfpf, (n=1,2,3...) or
5. a kind of detecting metal pipeline system based on time domain electromagnetic method according to claim 4, which is characterized in that described
The waveform of bipolarity recurrent pulse exciting current is square wave, trapezoidal wave or triangular wave.
6. a kind of detecting metal pipeline system based on time domain electromagnetic method according to claim 5, which is characterized in that described
The duty ratio of bipolarity recurrent pulse exciting current is 0.25-0.75.
7. a kind of detecting metal pipeline system based on time domain electromagnetic method according to claim 5 or 6, which is characterized in that
The bipolar square wave pulse back edge turn-off time is nanosecond, and the bipolarity trapezoidal wave pulse back edge turn-off time is Microsecond grade,
After bipolarity triangular pulse along the turn-off time be Microsecond grade or Millisecond.
8. a kind of detecting metal pipeline system based on time domain electromagnetic method according to claim 7, which is characterized in that described
Reception device is built-in with upper end horizontal component magnetic field sensor and lower end horizontal component magnetic field sensor, and upper end horizontal component magnetic
The technical parameter of field sensor and lower end horizontal component magnetic field sensor, performance indicator and installation position all same.
9. a kind of detecting metal pipeline system based on time domain electromagnetic method according to claim 8, which is characterized in that described
Vertical component magnetic field sensor is equipped between upper end horizontal component magnetic field sensor and lower end horizontal component magnetic field sensor.
10. a kind of detecting metal pipeline system based on time domain electromagnetic method according to claim 9, which is characterized in that institute
It is hollow line to state upper end horizontal component magnetic field sensor, lower end horizontal component magnetic field sensor and vertical component magnetic field sensor
Circle or magneto-dependent sensor.
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| CN201820254377.3U CN207908706U (en) | 2018-02-12 | 2018-02-12 | A kind of detecting metal pipeline system based on time domain electromagnetic method |
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| CN114740535B (en) * | 2022-04-13 | 2023-10-24 | 江苏省工程勘测研究院有限责任公司 | Underground pipeline detection device and method |
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