CN201698031U - System for detecting buried conductor - Google Patents
System for detecting buried conductor Download PDFInfo
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- CN201698031U CN201698031U CN2009200075765U CN200920007576U CN201698031U CN 201698031 U CN201698031 U CN 201698031U CN 2009200075765 U CN2009200075765 U CN 2009200075765U CN 200920007576 U CN200920007576 U CN 200920007576U CN 201698031 U CN201698031 U CN 201698031U
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Abstract
A system for detecting a buried conductor comprises a launcher which can generate AC test current in the buried conductor, a receiver which is used for detecting that the magnetic field is generated by the test current in the buried conductor, and a communication link arranged between the launcher and the receiver, wherein the test current comprises a first component and a second component the frequency of which is different that of the first component, and the receiver monitors the phase creeping of the first component and the second component, and controls the launcher to reset phase difference between the first component and the second component to be as a phase creeping added value. The system is used for detecting the conductor buried the underground.
Description
Technical field
The utility model relates to a kind of system that is used to survey buried conductor.
Background technology
The place of burying power cable, fiber optic cables or common-use tunnel begin to excavate or other work before, determine that the cable that these are buried or the position of pipeline are very important to guarantee that it is not damaged during operation.In case determined the position of the communal facility of burying, the position that then can calculate this communal facility is to determine the excavating depth of safety.
The electromagnetic radiation that current emission can be detected by electronic antenna.If for fiber optic cables or nonmetal common-use tunnel have disposed the miniature electric tracer line, then can in tracer line, sense alternating current, it radiates electromagnetic radiation with exchanging.Well-known, use detector to survey by the electromagnetic field that exchanges the current emission.
A kind of a kind of work down in two kinds of patterns in such detector is called " initiatively " or " passive " pattern.Every kind of pattern has its look-in frequency bandwidth separately.
Passive Mode comprises " power supply " pattern and " radio " pattern.In electric source modes, detector is surveyed the magnetic field of the 50/60Hz that the conductor by the power supply of delivery AC power grid produces, perhaps as near the radiation once more of the result's of the cable of delivery AC power supplies conductor, the magnetic field with the higher harmonics that reaches about 5KHz.In wireless mode, detector is surveyed ultralow frequency (VLF) radio energy, and it is by buried conductor radiation once more.Traditional VLF radio-signal source is a plurality of VLF long wave transmitters, comprises commercial with military.
In the aggressive mode, independent signal projector produces the alternating magnetic field with given frequency and modulation, the electric current near the buried conductor its induction.This signal projector can directly be connected to conductor or, in the direct impossible place of connected reference, signal projector can be arranged and induced signal in conductor near buried conductor.This buried conductor is the signal of emission signal generator generation once more.
When using aggressive mode, must consider some factors.When transmitter is that conventional to preserve power consumption as far as possible when effectively producing test signal when providing electric power by the veneer battery be very important, so that prolong the serviceable life of transmitter battery.So should reduce to minimum from the signal energy of transmitter output to reduce battery consumption.In addition, the high energy signals that is connected to unnecessary circuit and covering circuit can cause detection of a target buried conductor difficulty.
Transmitter can be set to certain frequency and type of waveform emission AC test signals.Many factors are depended in the selection of frequency, for example respond to easily in the buried conductor test signal and from the interference of ambient signals.
About the selection of AC test signals frequency, radio-frequency signal is generally used for high resistance circuit or low insulation telecommunication line, although along conductor distance than low frequency signal reduce rapider.Intermediate frequency signal be generally used for system's service cable and continuous metal pipeline and low frequency signal be used for the application definition terminal long-distance tracking ().
Frequency selects test signal to be not suitable at first, because the undesired signal of surrounding environment.Other proximity conductors that signal is being carried out are in identical frequency, or have the identical frequency test signal of harmonic frequency and may cause the receiver of the poor's signal-noise ratio signal to detect.Because frequency around this interference, the transmitter that the frequency test signal that may need to change is produced is to avoid interference frequency on every side.
Therefore, when in buried conductor, using transmitter to produce the alternating-current measurement electric current, the operator may need launcher signal power and frequency are set repeatedly, is a suitable frequency so that make the signal projector that is produced, the receiver that is detected like this and an effective energy.This just need have an independent operator to participate in for transmitter and receiver, or the operator of receiver is repeatedly in transmitter and the travelling between the receiver objective, so this is very time-consuming.
The U.S. Pat 6356082 of Schonstedt Instruments Co. has disclosed a system that surveys buried conductor, comprise a transmitter and a receiver, between is set up a wireless link, thereby allow just can obtain important information from receiver, and the operation of control transmitter from transmitter away from the operator of transmitter.
When with a test signal applications time in a target buried conductor to be followed the trail of, if there be second buried conductor to be in close proximity to target conductor, the generation of will having any problem.When second conductor was loaded with the ground loop electric current, because the coupling capacitance between two buried conductors or directly engage, the field that is loaded with the target buried conductor radiation of test signal may induce electric current on second buried conductor.Induced electricity on second conductor fails to be convened for lack of a quorum and makes second conductor produce radiation again, and the machine that is received receives.Therefore, when following the trail of the buried conductor path, need to confirm that tracked conductor is target conductor rather than second buried conductor, because test signal is coupled on second buried conductor from target conductor.
The patent WO90/09601 of Radiodetection Ltd. has described one and has followed the trail of an electrical conductor of burying, and particular content is as follows.An AC test signals has first and second parts, and its frequency is relevant with phase place, is applied to a target conductor, and electromagnetic field is detected from a plurality of different places.By considering the phase place of first and second parts, can determine that the conductor that is detected is target conductor or second conductor.
We describe a kind of improved detection buried conductor system that can overcome the shortcoming in some legacy systems in this application
The utility model content
First purpose of the present utility model has provided a system that is used to survey buried conductor, this system comprises: one is used to produce the device of alternating-current measurement electric current in buried conductor, described measuring current comprises first assembly and second assembly, and second assembly has the frequency inequality with the frequency of first assembly; In described buried conductor, be used to survey the device of the electromagnetic field that produces by measuring current, and the device that is used to measure phase differential between first assembly and second assembly, and be used to be provided at and be used to survey the device of electromagnetic field and be used to produce communication linkage between the device of alternating-current measurement electric current; The device that wherein is used to survey the device of electromagnetic field and is used to produce the alternating-current measurement electric current is configured to have the device of following communication link relation respectively: be used to test electromagnetic field device and can change phase differential between first assembly and second assembly.
The device that is used to produce the device of alternating-current measurement electric current and is used to survey electromagnetic field is configured to have the device of following communication link relation: the device that is used to survey electromagnetic field can change the phase differential between first assembly and second assembly, be by:
The device that is used to survey electromagnetic field is configured the phase differential between comparison relative reference phase differential and first assembly and second assembly, calculates the phase place creep with this; When the phase place creep is higher than threshold ones and when being lower than wealthy family's limit value, the device that is used to survey electromagnetic field is configured to transfer a command to the device that is used to produce the alternating-current measurement electric current, changes phase differential between first assembly and second assembly with this; Be configured to accept the order that sends from the device that is used to survey electromagnetic field with the device that is used to produce the alternating-current measurement electric current, remove to change phase differential between first assembly and second assembly with this.
The device that is used to survey electromagnetic field comprises a user interface and be configured to transmit the device that is used to survey electromagnetic field of warning when the phase place creep is higher than upper threshold.
This warning comprises one first assembly and the anti-phase warning of one of them phase place of second assembly, a perhaps electromagnetic field that detects by the device that is used for the surveying electromagnetic field warning that can not produce by the buried conductor measuring current.
Threshold ones is 5 degree, preferred 3 degree and 2 degree.
The upper threshold value is 60 degree, preferred 80 degree and 88 degree.
On the position of described buried conductor, the fixed phase difference can be determined.
Being used to survey the device of electromagnetic field and being used to produce communication linkage between the alternating-current measurement current device, is to be used to produce the alternating-current measurement current device and the transceiver that is used to survey on the device of electromagnetic field produces by each.
Communication linkage may be a duplex or half-duplex is wireless or wire communication link.Radio communication can be used Bluetooth communication protocol.
If there is not the operator's of system intervention, just can disposes the device that is used to survey electromagnetic field and remove to change phase differential between first assembly and second assembly.
Rely on output module, be used for producing the measuring current that the alternating-current measurement current device may produce described buried conductor.Because in described buried conductor, output module is directly connected on the part buried conductor or at the buried conductor periphery and clamps, and this output module radiates an electromagnetic field and responds to measuring current like this.
The device that is used to survey electromagnetic field comprises a plurality of antennas that are used to survey electromagnetic field, and these antenna is by producing by measuring current in buried conductor, and wherein each antenna can both be exported typical electromagnetic intensity signal.
This system comprises that further one is used to amplify the amplifier of magnetic field intensity signal.
This system further comprises: the analogue means that the converts magnetic field strength signal is become the digitalizer of digital signal; Digital signal processor with the signal of arranging processing digital signal and isolated predetermined band.
Second purpose of the present utility model provided a kind of method of surveying buried conductor, it comprises: a kind of transmitter that is used for producing at buried conductor an alternating-current measurement electric current is provided, and this measuring current comprises having second assembly that first assembly and frequency are different from first assembly; Provide in buried conductor, to be used to survey the receiver that electromagnetic field produces by measuring current, and be used for being determined at the receiver of phase differential between receiver first assembly and second assembly; Communication linkage between one transmitter and the receiver is provided; And through the communication linkage between transmitter and the receiver, receiver can change the phase differential between first assembly and second assembly.
Receiver may change phase differential between first assembly and second assembly, and passes through: the phase differential of receiver between fixed phase difference and first assembly and second assembly is made comparisons, calculate the phase place creep with this; The relatively phase place creep of threshold ones and wealthy family's limit value; When the phase place creep is higher than threshold ones and when being lower than wealthy family's limit value, transmit in just from the receiver to the transmitter and order, change phase differential between first assembly and second assembly with this; Change is the phase differential in transmitter between first assembly and second assembly.
Receiver comprises a user interface and a warning message, when the phase place creep is higher than wealthy family's limit value, and will warning in the receiver.This warning comprises the warning that one first assembly is opposite with one of them phase place of second assembly, a perhaps electromagnetic field that detects by the device that is used for the surveying electromagnetic field warning that can not produce by the buried conductor measuring current.
Threshold ones is 5 degree, preferred 3 degree and 2 degree.
Upper threshold is 60 degree, preferred 80 degree and 88 degree.
On the position of described buried conductor, the fixed phase difference can be determined.
Between receiver and transmitter communication linkage being arranged, is to produce by the transceiver on each receiver and the transmitter.
Communication linkage be a duplex or half-duplex is wireless or wire communication link.Wireless communication link can use Bluetooth communication protocol.
If wherein there is not the operator's of system intervention, the device that is used to survey electromagnetic field is disposed at and changes phase differential between first assembly and second assembly.
Wherein rely on output module, the measuring current of described buried conductor can be used to produce the alternating-current measurement current device and produce, in described buried conductor, described output module is directly connected on the part buried conductor or at the buried conductor periphery and clamps, and described like this output module radiates an electromagnetic field and responds to measuring current.
Receiver comprises a plurality of antennas that are used to survey electromagnetic field, and these antenna is by producing by measuring current in buried conductor, and wherein each antenna can both be exported typical electromagnetic intensity signal.
The utility model method further comprises the amplifier that is used to amplify magnetic field intensity signal, with the analogue means that the converts magnetic field strength signal is become the digitalizer of digital signal; Digital signal processor with the signal of arranging processing digital signal and isolated predetermined band.
Provided a kind of system that tests buried conductor by another purpose of the present utility model, it comprises: one is used for being used to produce at buried conductor the transmitter of alternating-current measurement electric current, and described measuring current comprises having second assembly that first assembly and frequency are different from first assembly; One is used to survey the receiver that electromagnetic field produces by measuring current in buried conductor, and is used for being determined at the receiver of phase differential between receiver first assembly and second assembly; The device that is used for communication linkage between one transmitter and the receiver; Wherein the relation of the communication linkage between transmitter and the receiver is set to: receiver can change the phase differential between first assembly and second assembly.
Use the utility model and survey the system of buried conductor, have following beneficial effect: can more accurately survey underground buried conductor easily; Native system can be undoubted the field of determining to be detected whether be the target conductor radiation of having used test signal, overcome the difficulty that runs into when conventional art has other conductor in the position near target conductor; Native system is compatible strong, can be applied in any traditional approach; The intelligent degree height of native system can reduce manually-operated, or the like.
Description of drawings
Fig. 1 is the synoptic diagram that is used to survey the buried conductor system of the present utility model;
Fig. 2 is the block diagram of transmitter in the system shown in Figure 1;
Fig. 3 is the block diagram of receiver in the system shown in Figure 1;
The test signal through-put power that Fig. 4 is produced by transmitter for first embodiment of the utility model uses system shown in Figure 1 to set and the process flow diagram of frequency approach;
The test signal through-put power that Fig. 5 is produced by transmitter for second embodiment of the utility model uses system shown in Figure 1 to set and the process flow diagram of frequency approach;
Fig. 6 resets the process flow diagram of the phase differential method between the different frequency component of the test signal that is produced by transmitter for embodiment of the utility model uses system shown in Figure 1.
Embodiment
Fig. 1 is the synoptic diagram that is used to survey the buried conductor system of the present utility model, by embodiment of the present utility model, comprises a portable transmitter 5 and a portable receiver 7.The close buried conductor 3 in the position of transmitter 5, and serve as the device that is used to produce the alternating current test signal.
An antenna of transmitter is transfused to an alternating voltage, produces one and connects buried conductor 3 magnetic field 9 on every side, thereby respond to an alternating current test signal on buried conductor 3.This alternating current test signal is as 11 buried conductor 3 radiation of an electromagnetic field,
Fig. 2 is the block diagram of a portable transmitter 5 in the system 1 of Fig. 1.The alternating current test signal is by output module 21 radiation, and is coupled on the buried conductor 3, thereby produces the alternating-current measurement electric current on buried conductor 3.In other embodiments, be feasible if directly contact conductor, transmit can by direct connection output module 21 and buried conductor 3 or with output module 21 be fixed on buried conductor 3 around conventional art be applied to buried conductor 3.Output module 21 also can be full of a scope, thus all the lead energisings in this scope of giving.
Control by a signal processing module 23 by the test signal that output module 21 produces.These signal processing module 23 signalization power, frequency and modulation system are applied to buried conductor 3.Signal processing module 23 and output module 21 are by 25 controls of a controller.The operation of transmitter 5 is set by a subscriber interface module 27 by the operator, is perhaps sent to the order setting of communication module 15 by receiver 7, specifically describes as follows.
Fig. 3 is portable receiver 7 block diagrams of system shown in Figure 11.Electromagnetic field 11 by buried conductor 3 radiation is detected by the antenna in the Anneta module 31.The electromagnetic field of a field intensity signal representative antennas of each antenna output.The output of Anneta module 31 is by signal processing module 33 input, thereby it comprises that one can be separated the signal processing module 33 of expected frequence and handle these signals and obtains their characteristic.Signal processing module 33 comprises a pre-amplification stage, as is detected signal more weak the time, scalable field intensity signal by antenna output.Signal processing module 33 also comprises an analog to digital converter, field intensity signal can be converted to digital signal and a digital signal processing module, can handle digitizing signal.Picture transmitter 5, receiver 7 also comprises a controller 35, power module 37, communication module 13, memory module 39 and user interface 41.The each several part of portable receiver 7 is arranged on (not shown) in the shell.
The communication module 13 of receiver 7 and transmitter 5,15 provide the communication/data link between a receiver 7 and the transmitter 5, thereby enhanced system 1 operator's station-keeping ability has been simplified operation interface, and helps a user to operate receiver 7 and transmitter 5 simultaneously.In the present embodiment, communication linkage is a radio-frequency (RF) telemetry system, can provide half-duplex operation between receiver 7 and transmitter 5.In other embodiments, can use the communication linkage of full duplex.
Long apart from bluetooth (RTM) transceiver by using, long apart from bluetooth (RTM) series as Ezurio (RTM) BTM404, the communication linkage between receiver 7 and the transmitter 5 can remain in the scope of 800 meters of visual ranges.Provide good balance in the low power consumption of this communication standard battery request in the scope of communication linkage and receiver 7 and transmitter 5, thereby kept communication linkage.Other communication standard also can be applied among other the embodiment.
In the present embodiment, receiver 7 can full powers control transmitter 5.The measured serial interface protocol of communications layer is applicable to synchronously or asynchronous serial data.Receiver 7 is as bus controller, and transmitter 5 is as slave.All from receiver 7 send to transmitter order have transmitter 5 to confirm, thereby transmitter 5 and receiver are carried out synchronously.If because verification and error or confirmation signal are not received by the receiver, receiver 7 and transmitter 5 suppose that all this order is not activated.
Among first embodiment of system 1, receiver order and transmitter response provide in table 1.
Order of table 1 receiver and transmitter response
| Order |
| ? |
| Setpoint frequency |
| The setting power requirement |
| The setting voltage requirement |
| Set current requirements |
| Increase/reduction frequency |
| The inductive mode ON/OFF |
| The 8KFF ON/OFF |
| CD waveform ON/OFF |
| ACD waveform ON/OFF |
| Increase CD F1 phase place |
In second embodiment, receiver 7 and transmitter 5 have explosion command and response, and be as shown in table 2.
Additional receiver order and transmitter response among second embodiment of table 2
| Order |
| ? |
| The request impedance ground |
| The output of request power |
| The output of request voltage |
| Request electric current output request cell voltage |
In first embodiment of the present utility model of Fig. 1, according to method shown in Figure 4, system 1 can lead to
Cross the characteristic of remote control setting by the test signal of transmitter 5 emissions.
In step S107, receiver 7 calculates the signal to noise ratio (S/N ratio) of test signal under the frequency of test signal.The signal to noise ratio (S/N ratio) of test signal should be than being higher than a lower threshold value, thereby can handle test signal, and in step S109, receiver 7 determines whether the signal that detects is higher than a lower threshold value under the frequency of test signal.If on the frequency of test signal, noise is arranged, for example since the harmonic wave of the interference of adjacent signals or same frequency produce, in step S111, receiver 7 is determined a new test signal by a spot of adjustment signal frequency so, as in positive and negative 17 hertz scope.Whether adjust signal frequency and can determine (according to the estimated value of signal to noise ratio (S/N ratio)) automatically, perhaps under operator's requirement, manually change by receiver.In step S113, receiver 7 sends one " setpoint frequency " and " setting power requirement " order to transmitter 5, and transmitter 5 confirms that by sending one response is to receiver 7 these orders of affirmation.This method is got back to step S103 then, and repeating step S103 to S113, and the signal to noise ratio (S/N ratio) of the test signal of surveying up to receiver 7 is higher than a lower threshold value.
Lower threshold value is 20dB (10 hertz of bandwidth) at least, best is at least 12dB (10 hertz of bandwidth) and further the best be 6dB (10 hertz of bandwidth) at least.
In case signal to noise ratio (S/N ratio) is defined as being higher than lower threshold value, then at step S115, receiver 7 determines whether can be lowered by the through-put power of the test signal of transmitter 5 emissions.A higher threshold value is 40dB (10 hertz of bandwidth), best is at least 50dB (10 hertz of bandwidth) and further the best be 60dB (10 hertz of bandwidth) at least.The reduction of the through-put power of test signal can reduce the power consumption of transmitter 5, thereby has prolonged the working time of power module 29, but can produce the test signal with receiver 7 received signal to noise ratio simultaneously.If lower signal to noise ratio (S/N ratio) can be accepted, so in step S117, receiver 7 is determined a lower test signal power, and in step S113, receiver 7 sends one " setpoint frequency " and " setting power requirement " order to transmitter 5, and transmitter 5 confirms that by sending one response is to receiver 7 these orders of affirmation.This method is got back to step S103 then, and repeating step S103 to S117, and the signal to noise ratio (S/N ratio) of the test signal of surveying up to receiver 7 is higher than a lower threshold value, and the through-put power of test signal is an optimum value.In case these conditions all satisfy, in step S119, receiver is handled test signal, thereby determines, for example the degree of depth of buried conductor.
In second embodiment of the present utility model, according to method shown in Figure 5, system 1 shown in Figure 1 can Remote sets the characteristic of the test signal of transmitter 5 emissions.From the above mentioned and reference table 3 and table 4, in second embodiment, receiver 7 and transmitter 5 have the order and the response collection of an expansion.
For first embodiment, in second embodiment, transmitter 5 and receiver 7 are unlocked, and in step S201, the communication linkage between transmitter 5 and the receiver 7 is established.In in step S203, transmitter 5 is measured the complex impedance of ground connection, and sends resistance value to receiver.In the present embodiment, this step is the response that receiver 7 sends to transmitter 5 " request impedance ground " order.In other embodiments, after in case the communication link between transmitter 5 and the receiver 7 is set up, the measurement data of impedance ground can periodically be measured and send to transmitter 5 to receiver 7, and perhaps the measurement data of impedance ground can be measured and send to transmitter to receiver 7.
At step S205, " setpoint frequency " and one " setting power requirement " order of receiver 7 emissions is to transmitter 5, and transmitter 5 confirms that by sending one response is to receiver 7 these orders of affirmation.In step S207, the power of test signal and frequency are set according to the order that receiver 7 sends by transmitter 5.The test signal and the buried conductor 3 that are sent by transmitter 5 produce coupling.
In step S209, receiver 7 is surveyed the electromagnetic signal 11 that buried conductor 3 radiation are arranged, and in step S211, for first embodiment, receiver 7 calculates the signal to noise ratio (S/N ratio) of test signal under the frequency of test signal.In step S213, receiver 7 determines whether the signal that detects is higher than a lower threshold value under the frequency of test signal.If signal to noise ratio (S/N ratio) is lower than threshold value, in step S215, as mentioned above, receiver 7 is determined a new test signal by a spot of adjustment signal frequency so.This method is got back to step S205 then, and repeating step S205 to S215, and the signal to noise ratio (S/N ratio) of the test signal of surveying up to receiver 7 is higher than threshold value.
In case signal to noise ratio (S/N ratio) is defined as being higher than lower threshold value, then at step S217, receiver 7 determines whether whether can be lowered by the through-put power of the test signal of transmitter 5 emissions.If lower signal to noise ratio (S/N ratio) can be accepted, in step S219, receiver 7 is determined a lower test signal power so.This method is got back to step S205 then, and repeating step S205 to S219, and the signal to noise ratio (S/N ratio) of the test signal of surveying up to receiver 7 is higher than threshold value, and the through-put power of test signal is an optimum value.In case these conditions all satisfy, in step S221, receiver is handled test signal, thereby determines, for example the degree of depth of buried conductor 3.
The technology of describing in WO90/09601 is applied in the utility model, combines with communication link between transmitter 5 and the receiver 7, thereby strengthens operator's detectivity.In this most preferred embodiment, a component of signal f
1Be other component of signal f
2The twice of frequency.In other embodiments, a component of signal can be the even integer multiple or the subharmonic of other component of signal.
If be applied to the test signal of target conductor and near second conductor coupling, the phase place of this signal is opposite with original signal so probably.Coupling mechanism between adjacent conductor can be resistive, capacitive or perception.Under the situation of resistive coupling, when signal is back to transmitter along low impedance path phase drift might appear.Therefore, the component f of known detectable signal
1, f
2Phase place be respectively φ
F1And φ
F2, might be able to distinguish " original signal " of outflow and second signal that is harmful to.This method is called direction of current identification.
At receiver, double lower frequency f
2Can produce two signal f of same frequency
1, 2f
2, and have phase respectively
F1With 2 φ
F2φ
F1-2 φ
F2Value be the phase invariant amount, that is to say that it has a value of original conductor, and the phase deviation of one 180 degree arranged for the signal of adjacent communal facility.Therefore, the field that can be undoubted determine is detected whether be used test signal the target conductor radiation or by other radiation of conductors.
By this method, the phase place of two signals of receiver can be compared, thus the conductor of identification test signal applications and the conductor that is loaded with the ground loop electric current.
As two frequency component f
1, f
2When separating by 2 multiples, the capacitive leakage current of high frequency components f1 is low frequency component f at least
2Twice.This causes frequency component f
1, f
2Have different attenuation rate and phase deviation along conductor, thereby cause frequency component f in receiver 7 generations
1, f
2Between phase difference
F1-2 φ
F2Electric leakage.
Therefore, may be because test signal is coupled on second conductor along the phase reversal of measuring on the point that disperses on the buried conductor length, or because at frequency component f
1, f
2The cheap accumulation of phase place of phasetophase.
When along target conductor probing test signal the time, in order to overcome potential uncertainty, two frequency component f
1, f
2Between phase differential compare a known reference point and the fixed phase difference of initial phase offset respectively.As the f that measures
1, f
2Between phase differential when increasing, the replacement fixed phase is poor, thus leak can be tracked for phase place.This technology is called as direction of current and resets.
In an embodiment of the present utility model, according to method shown in Figure 6, system 1 shown in Figure 1 can reset direction of current and measure.In step S301, f
1, f
2Between initial phase difference by calculating with the enough near locational receiver 7 of transmitter 5, the phase reversal that is caused by leakage can not take place.In step S303, the f that on the reference position, calculates by receiver 7
1, f
2Between phase differential be stored in the memory module 39 of receiver 7.
In step S307, if leaking, phase place is higher than lower threshold value, in step S309, whether the phase place leakage is higher than higher threshold value can be determined so.If leaking to be determined, phase place is higher than higher threshold value, so in step S311, receiver determines that conductor that receiver the surveys test signal on it comes from the target conductor coupling, thus perhaps the operator away from the reference position a big phase place has taken place has leaked.Receiver sends a warning and has phase reversal to the operator.In step S313, the operator must return nearest reference position, and on this position, known test signal is not coupled on second conductor, and here continues to survey.Higher amplitude threshold value is 60 degree, and the best is 80 degree, is more preferred from 88 degree.
If phase place is leaked between higher and lower threshold value, in step S315, transmitter is given in " increasing CD F1 phase place " order that receiver sends in the table 1, thereby increases f so
1Phase place, therefore can reduce f
1And f
2Between phase differential.In step S317, transmitter 5 increases f at this
1Phase place, and in step S303, the f on new reference position
1And f
2Between phase differential be stored in the receiver 7.Transmitter 5 sends " increasing a CD F1 phase place " confirmation and gives receiver 7.
Various improvement are apparent and easy to know for the operator of habit, and in all improvement all should drop in the interest field of the present utility model.
Various aspects of the present utility model can be applied in any traditional approach, for example, use specific hardware, perhaps small-sized hardware or software.Treatment facility can comprise any suitable equipment that has program, multi-purpose computer for example, and personal digital assistant, mobile phone is as WAP or third generation phone or the like.Since the utility model can be applied as software, various aspects of the present utility model also can be included in the computer utility on the programmable instrument.Computer software can offer programmable instrument by any traditional carrier medium.Carrier medium can comprise the carrier medium of a static state, as is loaded with the electricity of computer code, light, microwave, sound wave, radiofrequency signal.An example of the carrier medium of this static state is the TCP/IP signal that is loaded with computer code on IP network, for example Internet.This carrier medium can also comprise a storage medium, the storage of processor code-reading, and as floppy disk, hard disk, CD ROM, tape or solid-state memory storage.
Claims (11)
1. system that is used to survey buried conductor, it is characterized in that: described system comprises:
One is used to produce the device of alternating-current measurement electric current in buried conductor, described measuring current comprises first assembly and second assembly, and second assembly has the frequency inequality with the frequency of first assembly;
In described buried conductor, be used to survey the device of the electromagnetic field that produces by measuring current, and the device that is used to measure phase differential between first assembly and second assembly, and be used to be provided at and be used to survey the device of electromagnetic field and be used to produce communication linkage between the device of alternating-current measurement electric current;
The device that wherein is used to survey the device of electromagnetic field and is used to produce the alternating-current measurement electric current is configured to have the device of following communication link relation respectively: be used to test electromagnetic field device and can change phase differential between first assembly and second assembly.
2. system according to claim 1 is characterized in that:
The device that wherein is used to produce the device of alternating-current measurement electric current and is used to survey electromagnetic field is the device with following communication link relation: the device that is used to survey electromagnetic field can transfer a command to the device that is used to produce the alternating-current measurement electric current, can accept the order that sends from the device that is used to survey electromagnetic field with the device that is used to produce the alternating-current measurement electric current, remove to change phase differential between first assembly and second assembly with this.
3. system according to claim 2 is characterized in that: the device that wherein is used to survey electromagnetic field comprises a user interface and be configured to transmit the device that is used to survey electromagnetic field of warning when the phase place creep is higher than upper threshold.
4. system according to claim 2 is characterized in that: described threshold ones is 2 degree.
5. system according to claim 2 is characterized in that: described wealthy family limit value is 88 degree.
6. system according to claim 2 is characterized in that: be to be used to produce the alternating-current measurement current device by each and the transceiver that is used to survey on the device of electromagnetic field produces being used to survey the device of electromagnetic field and being used to produce communication linkage between the alternating-current measurement current device wherein.
7. system according to claim 2 is characterized in that: wherein be used to survey the device of electromagnetic field and be used to produce described communication linkage between the alternating-current measurement current device be a duplex or the half-duplex operation link.
8. system according to claim 2 is characterized in that: be a wireless or wire communication link being used to survey the device of electromagnetic field and being used to produce between the alternating-current measurement current device described communication linkage wherein.
9. system according to claim 2 is characterized in that: in described buried conductor, described output module is directly connected on the part buried conductor or at the buried conductor periphery and clamps.
10. system according to claim 2 is characterized in that: further comprise:
The converts magnetic field strength signal is become the analogue means of the digitalizer of digital signal;
With the digital signal processor of the signal of arranging processing digital signal and isolated predetermined band,
The device that wherein is used to survey electromagnetic field comprises a plurality of antennas that are used to survey electromagnetic field, and these antenna is by producing by measuring current in buried conductor,
Wherein each antenna can both be exported typical electromagnetic intensity signal.
11. a system that surveys buried conductor is characterized in that: described system comprises:
One is used for being used to produce at buried conductor the transmitter of alternating-current measurement electric current, and described measuring current comprises having second assembly that first assembly and frequency are different from first assembly;
One is used to survey the receiver that electromagnetic field produces by measuring current in buried conductor, and is used for being determined at the receiver of phase differential between receiver first assembly and second assembly;
The device that is used for communication linkage between one transmitter and the receiver;
Wherein the relation of the communication linkage between transmitter and the receiver is set to: receiver can change the phase differential between first assembly and second assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200075765U CN201698031U (en) | 2009-03-02 | 2009-03-02 | System for detecting buried conductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200075765U CN201698031U (en) | 2009-03-02 | 2009-03-02 | System for detecting buried conductor |
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| Publication Number | Publication Date |
|---|---|
| CN201698031U true CN201698031U (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200075765U Expired - Lifetime CN201698031U (en) | 2009-03-02 | 2009-03-02 | System for detecting buried conductor |
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| Country | Link |
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| CN (1) | CN201698031U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561514B (en) * | 2008-02-29 | 2012-09-05 | 雷迪有限公司 | System and method for detecting a buried conductor |
| CN111208519A (en) * | 2020-01-17 | 2020-05-29 | 西安探管者探测技术有限公司 | Underground pipeline depth measuring device and method |
-
2009
- 2009-03-02 CN CN2009200075765U patent/CN201698031U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561514B (en) * | 2008-02-29 | 2012-09-05 | 雷迪有限公司 | System and method for detecting a buried conductor |
| CN111208519A (en) * | 2020-01-17 | 2020-05-29 | 西安探管者探测技术有限公司 | Underground pipeline depth measuring device and method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CU01 | Correction of utility model patent |
Correction item: Priority Correct: 0803875.4 20080229 GB Number: 01 Page: The title page Volume: 27 |
|
| CU03 | Correction of utility model patent gazette |
Correction item: Priority Correct: 0803875.4 20080229 GB Number: 01 Volume: 27 |
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| ERR | Gazette correction |
Free format text: CORRECT: PRIORITY; FROM: NONE TO: 0803875.4;20080229;GB |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20110105 Effective date of abandoning: 20090302 |