CN1700040A - Method and apparatus for visual indication of line location in metal pipe exploration - Google Patents
Method and apparatus for visual indication of line location in metal pipe exploration Download PDFInfo
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Abstract
The invention relates to a method and device for indicating visually pipe line's position in mental pipe line's exploration in the field of exploration. It uses signal emission device to inject alternating current into pipe line; it generates magnetic field signal by alternating current of signal receiver's two sensor coil induction pipe line; it does amplifying, filtering, A/D transforming and Fourier anglicizing to the two coil's sensing signal to compute separately level bench and peak and vertical bench and peak of two magnetic field signal, then quotes the location of testing pipe line by similarity and difference of two components' bench and indicates definitely by indicator. The invention can be used for censuring underground pipe network and tracking and detecting the routine of mental pipe line and power cable.
Description
Technical field
The invention belongs to the field of detecting of object, relate in particular to a kind of method and apparatus that is used for metal pipe line or cable trace exploration or detection.
Background technology
Because a variety of causes, often need the metal pipe line that laid or the path of specifically laying of cable (metal sheath layer of cable and conductive core line also are equivalent to metal pipe line) are surveyed or searched.
Because often there is certain difference in construction drawing and the actual path of laying when laying; Perhaps, factors such as, personnel change remote because of the time cause construction drawing at that time to be difficult to find, and just need solve problem by carrying out the actual detection of laying the path of metal pipe line this moment.
Open day is on March 27th, 1996, publication number is to disclose a kind of " intelligent detector for underground metallic pipeline and data processor " in the Chinese invention patent application of CN1119280A, it has increased data processor and data sampling plate on the receiver of existing underground pipeline finder, data processor mainly comprises sampling hold circuit, analog to digital conversion circuit, computing machine, stepper motor driving circuit, stepper motor, sampling car and display, has adopted computer program to handle detection data.But it needs special track, by the sampling car of step motor control and special computing machine, exist whole device volume big, move inconvenience, computing method numerous and diverse, can not show testing result in real time, be difficult to satisfy needs or the like the deficiency of fast moving and detection in the large tracts of land scope.
The actual now pipeline detection technology that adopts, it generally is the tone currents signal that sends a certain frequency by signal generator to metal pipe line, metal pipe line is then to external radiation frequency magnetic field together, sensing coil magnetic field sensor signal by receiver, amplify after earphone or gauge outfit output, judge the position of pipeline, the difference of sound peak method and trough method is arranged by the size of judging signal amplitude according to the difference of sensing coil placement direction.When using sound peak method, coil is parallel to ground perpendicular to pipeline, and signal is the strongest in the time of directly over the pipeline, and weaken both sides; When using the trough method, coil is perpendicular to pipeline, and also perpendicular to ground, signal is the most weak in the time of directly over the pipeline, and both sides certain position signal is the strongest.These two kinds of methods all can not be expressed the position of pipeline intuitively, and must judge the position of pipeline by the operator by the Changing Pattern of analytic signal amplitude.Its detection efficiency is low, working strength is high (especially in pipeline complex area and noisy environment) and operator's practical operation experience is had higher requirements.
The day for announcing is on February 2nd, 2000, notification number is to disclose a kind of " buried cable detector " in the Chinese patent of CN2362135Y, it is made up of signal generator and signal receiver two parts, receives simultaneously by signal generator with two probe coils of receiver and is applied to low-frequency ac electric current on the cable.The electromagnetic field that this marking current forms is converted into the gauge outfit indication again at the induced potential that varies in size that two probe coils produce, therefrom zero point gauge outfit yawing moment indicate the orientation of cable.This method has solved the deficiency of preceding method and device to a certain extent, but it does not adopt any digitized processing means, only utilize signal amplitude as criterion, complex region at many pipeline parallel layings, and the bigger occasion of interference, tend to occur the left and right sides deflection instability of meter pointer, can't make clear and definite indication.
Summary of the invention
Technical matters to be solved by this invention provide a kind of in detecting metal pipeline the method and the device thereof of inditron line position directly perceived, it can be directly, clearly indicate tested pipeline by indicator in real time is in left side or the right side of detecting the pursuer, and utilize the advantage of digital signal processing, improve antijamming capability, the reliability and the intuitive of testing result indication have been improved, thereby improved the efficient of pipeline detection, reduced detection operations intensity, reduced experience requirement pipeline detection device user.
Technical scheme of the present invention is: provide a kind of in detecting metal pipeline the method for inditron line position directly perceived, comprise metal pipe line to be measured, the sender unit that is connected with metal pipe line and packaged type signal receiving device, it is characterized in that:
(1) in metal pipe line to be measured, injects the exchange current of certain amplitude by sender unit;
(2) sensing coil of two angled arrangements by signal receiving device, induced emission machine are added in the field signal that the exchange current on the metal pipe line to be measured produces;
(3) signal receiving device with two coil-induced to signal amplify respectively and filtering, carry out A/D conversion more respectively, become digital signal;
(4) will send into microcontroller circuit through the data after the A/D conversion and carry out Fourier analysis, calculate the level of two field signals and the amplitude and the phase place of vertical component respectively;
(5) are homophases according to two components or anti-phasely judge left side or the right side that metal pipe line to be measured is in sensing coil;
(6) carry out clear and definite pipeline position indication by indicator.
Wherein, the axis of described two sensing coils becomes 20～160 ° angle; The axis angle of two sensing coils is preferably 90 °.
The angle of laying the plane at its described two sensing coils and metal pipe line to be measured place is preferably one of them coil and is parallel to this plane, and the axis of two sensing coils, and is vertical with the pipeline path.
The present invention also provides a kind of device of inditron line position directly perceived in detecting metal pipeline according to the method described above, comprises the sender unit and the packaged type signal receiving device that are connected with metal pipe line, it is characterized in that:
Described sender unit is the sound signal transmitter;
Described packaged type signal receiving device comprises the sensing coil of two angled arrangements, first amplifying unit, second amplifying unit, phase demodulation unit and indicator, wherein, two sensing coils induced emission machine respectively are added in the magnetic field radiation that the alternating current on the pipeline produces, two coil-induced to signal pass through the processing of amplifying unit respectively after, send into the phase demodulation unit and carry out signal digitalized processing, obtain the level of two field signals and the amplitude and the phase place of vertical component, are homophases according to two components again or anti-phasely judge that pipeline is in the left side or the right side of sensing coil, and carry out clear and definite pipeline position indication by indicator.
Wherein, the axis of described two sensing coils becomes 20～160 ° angle, is preferably 90 °.
Its described first amplifying unit and second amplifying unit comprise coil resonance loop, adjustable gain amplifying element and analog filter at least; Wherein, antiresonant circuit is formed in resonant capacitance and sensing coil parallel connection; By operational amplifier, be serially connected in the resistance of operational amplifier input end and the adjustable potentiometer that is attempted by between operational amplifier input end and the output terminal constitutes the adjustable gain amplifying element; Constitute analog filter by second order active band-pass filter circuit.
Its described phase demodulation unit comprises A/D converting unit and CPU (central processing unit), and its A/D converting unit is conventional multichannel input a/d converter circuit; Its CPU (central processing unit) is conventional microcontroller circuit.
Its described indicator is LCD LCD, LED light emitting diode, loudspeaker or the earphone that has the respective peripheral accessory circuit.
Compared with the prior art, advantage of the present invention is:
1. comparing the phase place of the horizontal component of field signal and vertical component simultaneously with different, can be directly, clearly indicate tested pipeline by indicator in real time and be in left side or the right side of detecting the pursuer, the reliability and the intuitive of testing result indication have been improved, thereby improved the efficient of pipeline detection, reduced detection operations intensity, reduced experience requirement pipeline detection device user;
2. utilize the advantage of digital signal processing, improved the antijamming capability of whole detection device, be particularly suitable for the complex region of many pipeline parallel layings, and the bigger occasion of various electromagnetic interference (EMI);
3. whole device volume is less, be easy to carry, easy to operate, the intuitive of testing result indication is strong, purchases and detect with low cost, and test job labour intensity is low, the tester trains slightly and gets final product proper operation, reduced experience requirement, be easy to be accepted, be convenient to popularize by the user to pipeline detection device user.
Description of drawings
The present invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is detection method of the present invention and flow chart of steps;
Fig. 2 is the connection diagram of pick-up unit when using this method to determine to show pipeline position in detecting metal pipeline;
Fig. 3 is optimal way of the present invention and signal phase synoptic diagram thereof;
Fig. 4 is the functional-block diagram of packaged type signal receiving device;
Fig. 5 is the functional-block diagram of packaged type signal receiving device embodiment;
Fig. 6 is the embodiment wiring diagram of first, second amplifying unit of packaged type signal receiving device;
Fig. 7 is the functional-block diagram of another embodiment of packaged type signal receiving device.
1 is metal pipe line to be measured among the figure, and 2 is sender unit, and 3 is signal receiving device, and 4-1,4-2 are sensing coil, 5 planes of laying for metal pipe line to be measured place.
Embodiment
Among Fig. 1, provided by the present invention in detecting metal pipeline the method for inditron line position directly perceived, comprise metal pipe line to be measured, the sender unit that is connected with metal pipe line and packaged type signal receiving device, its concrete grammar is:
In metal pipe line to be measured, inject the exchange current of certain amplitude by sender unit;
The sensing coil of two angled arrangements by signal receiving device, induced emission machine are added in the magnetic field radiation signal that the exchange current on the metal pipe line to be measured produces;
Signal receiving device with two coil-induced to signal amplify respectively and filtering, carry out A/D conversion more respectively, become digital signal;
To send into microcontroller circuit through the data after the A/D conversion and carry out Fourier analysis, calculate the level of two field signals and the amplitude and the phase place of vertical component respectively;
Are homophases or anti-phasely judge left side or the right side that metal pipe line to be measured is in sensing coil according to two components;
Carry out clear and definite pipeline position indication by indicator.
Wherein, the axis of described two sensing coils becomes 20～160 ° angle; The axis angle of preferred two sensing coils is 90 °.
The angle of laying the plane at its described two sensing coils and metal pipe line to be measured place is preferably one of them coil and is parallel to this plane, and the axis of two sensing coils, and is vertical with the pipeline path.
Among Fig. 2, the output terminal and the pipeline to be measured 1 of sender unit 2 link, another output termination the earth; On pipeline, inject the tone currents of certain amplitude; When the inductive coil 4-1 of signal receiving device 3 and 4-2 are positioned at the pipeline left side, its indicator for displaying to the right, when its inductive coil was positioned at the pipeline right side, its indicator for displaying was left.
Wherein sender unit is commercially available conventional sound signal transmitter product, it does not also require the signal that sends single-frequency, only require that it contains a certain frequency component and gets final product (so that the inductive coil resonance of signal receiving device receives), so it both can send single frequency sinusoidal ripple signal, also the single-frequency square-wave signal can be sent, the sine or the square-wave signal of multiple combination of frequency can also be sent.
Among Fig. 3, the sensing coil 4-2 parallel with laying plane 5 (being generally ground) can directly respond to and obtain the horizontal component in the magnetic field that pipeline 1 gives off, another sensing coil 4-1 vertical with coil 4-2 can directly receive the vertical component in the magnetic field that pipeline gives off.
When being arranged in the left side of pipeline, above-mentioned double-sensing coil (is equivalent to the situation shown in the figure upper left quarter), the horizontal component in magnetic field and vertical component signal same-phase (referring to the waveform shown in the left side among the figure); When being arranged in the right side of pipeline, twin coil (is equivalent to the situation shown in the figure upper right quarter), the phase place of above-mentioned two signals opposite (referring to the waveform shown in the right side among the figure).
(promptly the axis angle of two sensing coils is 90 ° to adopt optimal way, one of them sensing coil is parallel to the plane of laying with metal pipe line to be measured place, and the axis of two sensing coils, vertical with the pipeline path) time, the calculation process amount minimum of CPU (central processing unit).
Certainly, also can select other sensing coil and the pipeline place angle of laying the plane, and other sensing coil axis angle, when the axis out of plumb of twin coil, numerical value according to its angle, by detected value being carried out the calculating of trigonometric function, calculate the horizontal component and the vertical component in magnetic field, but its process of resolving is complicated, the authorized strength work amount of program is big, the time of program run is long, and needed hardware resource is many, so generally use the orthogonal arrangement mode of twin coil axis to be advisable.
Among Fig. 4, the packaged type signal receiving device comprises sensing coil, first amplifying unit, second amplifying unit, phase demodulation unit and the indicator of two angled arrangements at least.
Angular relationship between two sensing coil and the position relation of laying the plane with the pipeline place are seen the described related content of Fig. 3.
Its first amplifying unit and second amplifying unit comprise coil resonance loop, adjustable gain amplifying element and analog filter at least.
Its indicator is LCD LCD, LED light emitting diode, loudspeaker or the earphone that has the respective peripheral accessory circuit, and the indicating device of other types all can as long as can carry out clear and definite prompting.
Two sensing coil induced emission machine respectively is added in the magnetic field radiation that the alternating current on the pipeline produces, two coil-induced to signal pass through the processing of amplifying unit respectively after, send into the phase demodulation unit and carry out signal digitalized processing, obtain the level of two field signals and the amplitude and the phase place of vertical component, are homophases according to two components again or anti-phasely judge that pipeline is in the left side or the right side of sensing coil, and carry out clear and definite pipeline position indication by indicator.
Among Fig. 5, the phase demodulation unit is made of A/D converting unit and CPU (central processing unit), all the other same Fig. 4.
Its A/D converting unit is conventional multichannel input a/d converter circuit, can adopt the conventional A/D converter spare of commercially available multichannel input, its quantified precision gets final product at 8, sample frequency generally transmitter be added in AC current frequency on the pipeline more than 8 times for good.
When employing has the single-chip microcomputer composition CPU (central processing unit) of A/D converter, can also use the A/D converter of single-chip microcomputer inside to constitute the A/D converting unit, to simplify circuit structure, reduce component number.
Two coil-induced signals that arrive are through after amplifying, insert two signal input pins of A/D converter, by CPU (central processing unit) A/D converter is controlled, the signal of sending here through first amplifying unit and second amplifying unit is sampled respectively and changed, promptly choose the signal sampling conversion that first amplifying unit is sent here in first change-over period, choose the signal sampling conversion that second amplifying unit is sent here in the next change-over period, choose the signal sampling conversion that first amplifying unit is sent here in the next change-over period again, with this rule periodic duty, the signal that first amplifying unit and second amplifying unit are sent here carries out the sampling in several cycles.
CPU (central processing unit) is conventional microcontroller circuit, it carries out Fourier analysis to the data that the A/D converting unit is converted to, calculate the level of field signal and the amplitude and the phase place of vertical component, according to the similarities and differences of phase place, the control indicator is indicated intuitively to the left or to the right again.
Because the method for the specific implementation of each functional circuit and employing Fourier analysis computation period digital signal amplitude and phase place is existing known routine techniques among above-mentioned each figure, no longer narrate at this, specifically can consult relevant teaching material or technology books (as " Basic Analog Electronics ", Wang Jihao writes, Shandong science tech publishing house, March in 2002 the 1st edition).
Among Fig. 6, aforesaid first amplifying unit and second amplifying unit comprise coil resonance loop, adjustable gain amplifying element and analog filter at least.
Antiresonant circuit is formed in capacitor C 101 and sensing coil parallel connection, and resonance frequency is that transmitter is added in the AC current frequency on the pipeline; Operational amplifier U101A, resistance R 101 and potentiometer VR101 form the adjustable gain amplifying element; U101B, R102, R103, R104, C102 and C103 form the second order active band-pass filter, and the harmonious vibration frequency of its centre frequency is identical.
The integrated circuit that is adopted in the present invention's the signal receiving device, operational amplifier can be selected LM324 or the identical or close integrated circuit of function with it for use, the A/D converter model can be selected TLC0832 or the identical or close integrated circuit of function with it for use, the model of the single-chip microcomputer of band A/D translation function can be selected C8051F020 or the identical or close integrated circuit of function with it for use, and other elements do not have specific (special) requirements.
Among Fig. 7, the phase demodulation unit also can adopt the circuit form of simulation phase demodulation unit to realize its function corresponding, two coil-induced to signal after first and second amplifying units carry out resonance, amplification and filtering respectively, differentiate the phase differential of two signals by simulation phase demodulation unit, if homophase, then export a kind of logic level (1 or 0), if anti-phase, then export another kind of logic level (0 or 1), indicator is then according to the difference of logic level, export different informations, carry out clear and definite left and right directions indication.
The simulation phase discriminator also is existing known routine techniques, and its concrete circuit is formed in this and no longer narrates.
Because the present invention is comparing with different the phase place of the horizontal component of field signal and vertical component simultaneously, can be directly, clearly indicate tested pipeline by indicator in real time and be in left side or the right side of detecting the pursuer, the reliability and the intuitive of testing result indication have been improved, thereby improved the efficient of pipeline detection, reduced detection operations intensity, reduced experience requirement pipeline detection device user; In addition, the present invention utilizes the advantage of digital signal processing, improved the antijamming capability of whole detection device, be particularly suitable for the complex region of many pipeline parallel layings, and the bigger occasion of various electromagnetic interference (EMI), whole device volume is less, be easy to carry, easy to operate, the intuitive of testing result indication is strong, purchase and detect with low cost, test job labour intensity is low, and the tester trains slightly and gets final product proper operation, has reduced the experience requirement to pipeline detection device user, be easy to be accepted, be convenient to popularize by the user.
The present invention can be widely used in the field of detecting such as path trace of generaI investigation, metal pipe line or the power cable of underground pipe network.
Claims (10)
1. the method for an inditron line position directly perceived in detecting metal pipeline comprises metal pipe line to be measured, the sender unit that is connected with metal pipe line and packaged type signal receiving device, it is characterized in that:
(1) in metal pipe line to be measured, injects the exchange current of certain amplitude by sender unit;
(2) sensing coil of two angled arrangements by signal receiving device, induced emission machine are added in the field signal that the exchange current on the metal pipe line to be measured produces;
(3) signal receiving device with two coil-induced to signal amplify respectively and filtering, carry out A/D conversion more respectively, become digital signal;
(4) will send into microcontroller circuit through the data after the A/D conversion and carry out Fourier analysis, calculate the level of two field signals and the amplitude and the phase place of vertical component respectively;
(5) are homophases according to two components or anti-phasely judge left side or the right side that metal pipe line to be measured is in sensing coil;
(6) carry out clear and definite pipeline position indication by indicator.
According to claim 1 described in detecting metal pipeline the method for inditron line position directly perceived, it is characterized in that the axis of described two sensing coils becoming 20～160 ° angle.
According to claim 1 or 2 described in detecting metal pipeline the method for inditron line position directly perceived, it is characterized in that the axis angle of described two sensing coils being preferably 90 °.
According to claim 1 described in detecting metal pipeline the method for inditron line position directly perceived, the angle of laying the plane that it is characterized in that described two sensing coils and metal pipe line to be measured place, be preferably one of them coil and be parallel to this plane, and the axis of two sensing coils is vertical with the pipeline path.
5. the device according to the described method of claim 1 inditron line position directly perceived in detecting metal pipeline comprises the sender unit and the packaged type signal receiving device that are connected with metal pipe line, it is characterized in that:
Described sender unit is the sound signal transmitter;
Described packaged type signal receiving device comprises the sensing coil of two angled arrangements, first amplifying unit, second amplifying unit, phase demodulation unit and indicator, wherein, two sensing coils induced emission machine respectively are added in the magnetic field radiation that the alternating current on the pipeline produces, two coil-induced to signal pass through the processing of amplifying unit respectively after, send into the phase demodulation unit and carry out signal digitalized processing, obtain the level of two field signals and the amplitude and the phase place of vertical component, are homophases according to two components again or anti-phasely judge that pipeline is in the left side or the right side of sensing coil, and carry out clear and definite pipeline position indication by indicator.
According to claim 5 described in detecting metal pipeline the device of inditron line position directly perceived, it is characterized in that the axis of described two sensing coils becoming 20～160 ° angle.
According to claim 5 or 6 described in detecting metal pipeline the device of inditron line position directly perceived, the axis angle of described two sensing coils of its feature is preferably 90 °.
According to claim 5 described in detecting metal pipeline the device of inditron line position directly perceived, it is characterized in that described first amplifying unit and second amplifying unit, comprise coil resonance loop, adjustable gain amplifying element and analog filter at least; Wherein, antiresonant circuit is formed in resonant capacitance and sensing coil parallel connection; By operational amplifier, be serially connected in the resistance of operational amplifier input end and the adjustable potentiometer that is attempted by between operational amplifier input end and the output terminal constitutes the adjustable gain amplifying element; Constitute analog filter by second order active band-pass filter circuit.
According to claim 5 described in detecting metal pipeline the device of inditron line position directly perceived, it is characterized in that described phase demodulation unit comprises A/D converting unit and CPU (central processing unit), its A/D converting unit be the multichannel input a/d converter circuit of routine; Its CPU (central processing unit) is conventional microcontroller circuit.
According to claim 5 described in detecting metal pipeline the device of inditron line position directly perceived, it is characterized in that described indicator is LCD LCD, LED light emitting diode, loudspeaker or the earphone that has the respective peripheral accessory circuit.
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| CNB2005100125436A CN100337127C (en) | 2005-05-25 | 2005-05-25 | Method and apparatus for visual indication of line location in metal pipe exploration |
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| CNB2005100125436A CN100337127C (en) | 2005-05-25 | 2005-05-25 | Method and apparatus for visual indication of line location in metal pipe exploration |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100480733C (en) * | 2006-03-13 | 2009-04-22 | 南京工业大学 | Ground measurement method for loading current of underground metal pipeline |
| CN101509979B (en) * | 2009-03-12 | 2011-01-19 | 云南电力试验研究院（集团）有限公司电力研究院 | Ground network detecting and positioning method for electric power |
| CN102590871A (en) * | 2012-02-23 | 2012-07-18 | 江苏三通仪器***有限公司 | Cable path detector |
| CN103837900A (en) * | 2013-09-09 | 2014-06-04 | 北京鼎臣超导科技有限公司 | Underground cable locating method and device based on vector magnetic field detection |
| CN103884965A (en) * | 2014-04-01 | 2014-06-25 | 淄博威纳电气有限公司 | Overhead line grounding failure locating method |
| CN105353415A (en) * | 2015-10-21 | 2016-02-24 | 中国科学技术大学 | Wire detection method and system |
| CN105606883A (en) * | 2015-12-21 | 2016-05-25 | 南宁学院 | Weak current detection system based on FFT filtering |
| CN107817531A (en) * | 2017-09-25 | 2018-03-20 | 西安电子科技大学 | Pipeline instrument receiver loop construction and signal processing method, pipeline instrument receiver |
| CN108398724A (en) * | 2018-02-09 | 2018-08-14 | 李法利 | waveform detection circuit |
| CN110596767A (en) * | 2019-08-06 | 2019-12-20 | 彭龙 | Novel pipeline path instrument |
| CN112904444A (en) * | 2021-01-22 | 2021-06-04 | 陕西中怡信息技术有限公司 | Underground pipeline detecting device |
| CN113074620A (en) * | 2021-05-11 | 2021-07-06 | 北京理工大学 | Metal pipeline composite parameter measuring method and system based on elevation intersection point |
| CN113359194A (en) * | 2021-08-09 | 2021-09-07 | 浙江图维科技股份有限公司 | Trenchless accurate positioning method and instrument for deeply buried underground pipeline |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102010028722A1 (en) * | 2010-05-07 | 2011-11-10 | Robert Bosch Gmbh | Detecting a metallic or magnetic object |
| DE102010031147A1 (en) * | 2010-05-07 | 2011-11-10 | Robert Bosch Gmbh | Detecting a metallic or magnetic object |
| DE102010028723A1 (en) * | 2010-05-07 | 2011-11-10 | Robert Bosch Gmbh | Detecting a metallic or magnetic object |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU600496A1 (en) * | 1975-04-22 | 1978-03-30 | Куйбышевский Ордена Трудового Красного Знамени Институт Имени Академика С.П.Королева | Metal detector |
| CN1119280A (en) * | 1993-03-19 | 1996-03-27 | 郑州大学 | Intelligent detector for underground metallic pipeline and data processing program |
| CN2362135Y (en) * | 1998-12-30 | 2000-02-02 | 蒋志国 | Buried cable detector |
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2005
- 2005-05-25 CN CNB2005100125436A patent/CN100337127C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100480733C (en) * | 2006-03-13 | 2009-04-22 | 南京工业大学 | Ground measurement method for loading current of underground metal pipeline |
| CN101509979B (en) * | 2009-03-12 | 2011-01-19 | 云南电力试验研究院（集团）有限公司电力研究院 | Ground network detecting and positioning method for electric power |
| CN102590871A (en) * | 2012-02-23 | 2012-07-18 | 江苏三通仪器***有限公司 | Cable path detector |
| CN103837900A (en) * | 2013-09-09 | 2014-06-04 | 北京鼎臣超导科技有限公司 | Underground cable locating method and device based on vector magnetic field detection |
| CN103884965A (en) * | 2014-04-01 | 2014-06-25 | 淄博威纳电气有限公司 | Overhead line grounding failure locating method |
| CN105353415A (en) * | 2015-10-21 | 2016-02-24 | 中国科学技术大学 | Wire detection method and system |
| CN105606883A (en) * | 2015-12-21 | 2016-05-25 | 南宁学院 | Weak current detection system based on FFT filtering |
| CN107817531A (en) * | 2017-09-25 | 2018-03-20 | 西安电子科技大学 | Pipeline instrument receiver loop construction and signal processing method, pipeline instrument receiver |
| CN108398724A (en) * | 2018-02-09 | 2018-08-14 | 李法利 | waveform detection circuit |
| CN110596767A (en) * | 2019-08-06 | 2019-12-20 | 彭龙 | Novel pipeline path instrument |
| CN112904444A (en) * | 2021-01-22 | 2021-06-04 | 陕西中怡信息技术有限公司 | Underground pipeline detecting device |
| CN112904444B (en) * | 2021-01-22 | 2024-02-09 | 陕西中怡信息技术有限公司 | Underground pipeline detection device |
| CN113074620A (en) * | 2021-05-11 | 2021-07-06 | 北京理工大学 | Metal pipeline composite parameter measuring method and system based on elevation intersection point |
| CN113074620B (en) * | 2021-05-11 | 2022-04-08 | 北京理工大学 | Metal pipeline composite parameter measuring method and system based on elevation intersection point |
| CN113359194A (en) * | 2021-08-09 | 2021-09-07 | 浙江图维科技股份有限公司 | Trenchless accurate positioning method and instrument for deeply buried underground pipeline |
| CN113359194B (en) * | 2021-08-09 | 2021-11-30 | 浙江图维科技股份有限公司 | Trenchless accurate positioning method and instrument for deeply buried underground pipeline |
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| CN100337127C (en) | 2007-09-12 |
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