CN2795875Y - Device for directly indicating pipeline position in metal pipeline detection - Google Patents
Device for directly indicating pipeline position in metal pipeline detection Download PDFInfo
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- CN2795875Y CN2795875Y CN 200520024148 CN200520024148U CN2795875Y CN 2795875 Y CN2795875 Y CN 2795875Y CN 200520024148 CN200520024148 CN 200520024148 CN 200520024148 U CN200520024148 U CN 200520024148U CN 2795875 Y CN2795875 Y CN 2795875Y
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Abstract
The utility model relates to a method and a device thereof for intuitively indicating the position of a pipeline in the detection of a metal pipeline, which belongs to the technical field of detection. A signal transmitting device injects an alternating current into the pipeline, and magnetic field signals generated by the alternating current in the pipeline are inducted by the two sensing coils of a signal receiving device; amplification, filtration, analog to digital conversion, Fourier analysis are carried out on the signals inducted by the two coils, and the amplitude value and the phase position of the horizontal and vertical components of the two magnetic field signals are respectively resolved; according to the similarity and the difference of the two components, the position of the metal pipeline to be measured is determined and definite indication is carried out by an indicator. The utility model adopts a method of phase position comparison, enhances the work efficiency of pipeline detection and the antijamming capability of the detection device by utilizing the advantage of digital signal processing, reduces the work intensity of the detection, is especially suitable for a complicated area where a plurality of pipelines are laid in parallel, is suitable for occasions of various occasions of strong electromagnetic interference, and can be widely used for the detection field of the general survey of an underground pipe network, the path tracking of the metal pipeline or a power cable, etc.
Description
Technical field
The utility model belongs to the field of detecting of object, relates in particular to a kind of device 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 problem to be solved in the utility model provide a kind of in detecting metal pipeline the device 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.
The technical solution of the utility model is: provide a kind of in detecting metal pipeline the device of inditron line position directly perceived, comprise 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 sensing coil, first amplifying unit, second amplifying unit, phase demodulation unit and the indicator of two angled arrangements; 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.
Further, 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.
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 phase demodulation unit is the simulation phase discriminator.
Its described indicator is LCD LCD, LED light emitting diode, loudspeaker or the earphone that has the respective peripheral accessory circuit.
Particularly, its described amplifying unit is made of operational amplifier U101A, B, capacitor C 101, C102, C103, potentiometer VR101, resistance R 101, R102, R103 and R104, wherein, capacitor C 101 and sensing coil parallel connection, form antiresonant circuit, resonance frequency is that transmitter is added in the AC current frequency on the pipeline; "-" input end of operational amplifier U101A is connected with an end of sensing coil through resistance R 101, "+" input end grounding of operational amplifier U101A, its output terminal is connected with "+" input end of operational amplifier U101B with C102 through resistance R 102, and through resistance R 102 and R103 ground connection, be connected with the output terminal of capacitor C 103 with operational amplifier U101B through resistance R 102 simultaneously, potentiometer VR101 is attempted by between "-" input end and output terminal of operational amplifier U101A; "-" input end grounding of operational amplifier U101B, resistance R 104 are attempted by between "+" input end and output terminal of operational amplifier U101B, and the harmonious vibration frequency of its centre frequency is identical.
Compared with the prior art, the utility model has the advantages that:
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
Below in conjunction with drawings and Examples the utility model is described further.
Fig. 1 is the connection diagram of pick-up unit when using this method to determine to show pipeline position in detecting metal pipeline;
Fig. 2 is optimal way of the present utility model and signal phase synoptic diagram thereof;
Fig. 3 is the functional-block diagram of packaged type signal receiving device;
Fig. 4 is the functional-block diagram of packaged type signal receiving device embodiment;
Fig. 5 is the embodiment wiring diagram of first, second amplifying unit of packaged type signal receiving device;
Fig. 6 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, 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. 2, 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, program run time long, needed hardware resource is many, so generally use the orthogonal arrangement mode of twin coil axis to be advisable.
Among Fig. 3, 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. 2.
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. 4, the phase demodulation unit is made of A/D converting unit and CPU (central processing unit), all the other same Fig. 3.
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, (Wang Jihao writes as " Basic Analog Electronics ", Shandong science tech publishing house, March in 2002 the 1st edition) active band-pass filter (P204) in, computing and treatment circuit (P177), ratio circuit (P177) and the active band-pass filter chapters and sections such as (P204) of signal.
Among Fig. 5, aforesaid 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 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.
Particularly, its amplifying unit is by operational amplifier U101A, B, capacitor C 101, C102, C103, potentiometer VR101, resistance R 101, R102, R103 and R104 constitute, wherein, capacitor C 101 and sensing coil parallel connection, form antiresonant circuit, "-" input end of operational amplifier U101A is connected with an end of sensing coil through resistance R 101, "+" input end grounding of operational amplifier U101A, its output terminal is connected with "+" input end of operational amplifier U101B with C102 through resistance R 102, and through resistance R 102 and R103 ground connection, be connected with the output terminal of capacitor C 103 with operational amplifier U101B through resistance R 102 simultaneously, potentiometer VR101 is attempted by between "-" input end and output terminal of operational amplifier U101A; "-" input end grounding of operational amplifier U101B, resistance R 104 are attempted by between "+" input end and output terminal of operational amplifier U101B.
The integrated circuit that is adopted in the signal receiving device of the utility model, 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. 6, 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 utility model 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 utility model 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 utility model 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 (9)
1. the device of an 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 sensing coil, first amplifying unit, second amplifying unit, phase demodulation unit and the indicator of two angled arrangements; 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 1 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 1 or 2 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 1 described in detecting metal pipeline the device of inditron line position directly perceived, the angle of laying the plane at described two sensing coils of its feature 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.
According to claim 1 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 1 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 1 described in detecting metal pipeline the device of inditron line position directly perceived, it is characterized in that described phase demodulation unit is the simulation phase discriminator.
According to claim 1 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.
According to claim 1 or 5 described in detecting metal pipeline the device of inditron line position directly perceived, it is characterized in that described amplifying unit is made of operational amplifier U101A, B, capacitor C 101, C102, C103, potentiometer VR101, resistance R 101, R102, R103 and R104, wherein, capacitor C 101 and sensing coil parallel connection, form antiresonant circuit, resonance frequency is that transmitter is added in the AC current frequency on the pipeline; "-" input end of operational amplifier U101A is connected with an end of sensing coil through resistance R 101, "+" input end grounding of operational amplifier U101A, its output terminal is connected with "+" input end of operational amplifier U101B with C102 through resistance R 102, and through resistance R 102 and R103 ground connection, be connected with the output terminal of capacitor C 103 with operational amplifier U101B through resistance R 102 simultaneously, potentiometer VR101 is attempted by between "-" input end and output terminal of operational amplifier U101A; "-" input end grounding of operational amplifier U101B, resistance R 104 are attempted by between "+" input end and output terminal of operational amplifier U101B, and the harmonious vibration frequency of its centre frequency is identical.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520024148 CN2795875Y (en) | 2005-05-25 | 2005-05-25 | Device for directly indicating pipeline position in metal pipeline detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200520024148 CN2795875Y (en) | 2005-05-25 | 2005-05-25 | Device for directly indicating pipeline position in metal pipeline detection |
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| CN2795875Y true CN2795875Y (en) | 2006-07-12 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353415A (en) * | 2015-10-21 | 2016-02-24 | 中国科学技术大学 | Wire detection method and system |
| CN106597553A (en) * | 2017-01-23 | 2017-04-26 | 金华马卡科技有限公司 | Concealed feature location device and method |
| 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 |
| CN110989012A (en) * | 2019-12-18 | 2020-04-10 | 浙江省特种设备科学研究院 | Accurate electromagnetic measuring method for underground pipeline depth and pipeline instrument device |
-
2005
- 2005-05-25 CN CN 200520024148 patent/CN2795875Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353415A (en) * | 2015-10-21 | 2016-02-24 | 中国科学技术大学 | Wire detection method and system |
| CN106597553A (en) * | 2017-01-23 | 2017-04-26 | 金华马卡科技有限公司 | Concealed feature location device and method |
| CN106597553B (en) * | 2017-01-23 | 2019-04-16 | 金华马卡科技有限公司 | A kind of covert features positioning device and localization method |
| 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 |
| CN110989012A (en) * | 2019-12-18 | 2020-04-10 | 浙江省特种设备科学研究院 | Accurate electromagnetic measuring method for underground pipeline depth and pipeline instrument device |
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Granted publication date: 20060712 Termination date: 20130525 |