CN108982658A - A kind of probe and its system for pipeline detection - Google Patents
A kind of probe and its system for pipeline detection Download PDFInfo
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Abstract
The present disclosure provides a kind of probes and its system for pipeline detection, the probe is attempted for the first time by leakage field sensor and eddy current sensor while being combined in a detection probe, and then the leakage field sensor advantage sensitive to tube wall near surface flaw to tube wall volume type weld defect control advantage and eddy current sensor is organically combined, realization is distinguished and is assessed to the inside and outside wall defect of tube wall, especially there is potential detection may near surface crack defect, have many advantages, such as that detection is accurate, precision is high.
Description
Technical field
The present invention disclose the technical field for being related to pipe detection more particularly to a kind of probe for pipeline detection and its
System.
Background technique
Pipeline is referred to as national energy main artery, for ensureing that national energy supply is of great significance.As pipeline takes
Labour enters aging, due to corrosion and stress, will appear various types of defects inside pipeline.Therefore, it is necessary to pipeline
Regularly effectively detection is carried out, excludes defect, in time to reduce the generation of pipeline breaking accident.
Currently, a variety of nondestructive detection systems about inner wall of the pipe are had proposed both at home and abroad, and such as: Magnetic Flux Leakage Testing System, electricity
Magnetic ultrasonic testing system and eddy detection system etc..Wherein, the magnetic leakage detecting probe used in Magnetic Flux Leakage Testing System has corruption
The advantages of it is high to lose sensibility, is adapted to high temperature, cold and the adverse circumstances such as underwater, but can only be examined using magnetic leakage detecting probe
Measure inner wall of the pipe with axial length, three direction sizes of circumferential width and radial depth volume flaw, and for
Only extend in two directions in inner wall of the pipe, in the crackle of third direction scale very little, is difficult to inspire enough leakage field inspections
The leakage magnetic flux of probing head detection causes testing result inaccurate.In addition, even if magnetic leakage detecting probe can detecte pipeline presence
Defect, but can not distinguish inner wall defect or outer wall defect, it is not accurate there are testing result the problems such as.Eddy detection system is
A kind of lossless detection method on the basis of electromagnetic induction principle is established, there is fast sensing response speed, high sensitivity, non-contact
The advantages that with couplant is not necessarily to, thus especially suitable for the detection to metal pipe internal wall defect.But traditional EDDY CURRENT system
The generally existing consistency of sensor in system is poor, detection signal is deposited vulnerable to the influence of the factors such as lift-off, detection efficiency and resolution ratio
In contradiction and the problems such as to the bad adaptability of test object.
Since the design feature of inner wall of the pipe is more complicated, defective form multiplicity, existing detection system and detection are visited
Head has been unable to satisfy existing detection needs, therefore, how to research and develop a kind of novel detection system, to solve the above problems, at
For people's urgent problem to be solved.
Summary of the invention
In consideration of it, the present disclosure provides a kind of probe and its system for pipeline detection, at least solve with
Past detection system and detection probe is unable to satisfy existing detection demand, does not simply fail to distinguish inside and outside wall defect, and
There is also testing result inaccuracy, it is inaccurate the problems such as.
One aspect of the present invention provides a kind of probe for pipeline detection, comprising: leakage field sensor 11, currents sensing
Device 12, the first communication unit 13, the second communication unit 14, probe control unit 15 and data outputting unit 16；
First output end of the probe control unit 15, the second output terminal control with the leakage field sensor 11 respectively
The connection of the control terminal of end and the eddy current sensor 12；
The output end of the leakage field sensor 11 is connect with the input terminal of first communication unit 13；
The output end of first communication unit 13 is connect with the first input end of the probe control unit 15；
The output end of the eddy current sensor 12 is connect with the input terminal of second communication unit 14；
The output end of second communication unit 14 is connect with the second input terminal of the probe control unit 15；
The third output end of the probe control unit 15 is connect with the input terminal of the data outputting unit 16.
It is preferred that the eddy current sensor 12 includes: driving unit 121, LC concussion exciting circuit unit 122, inductance value survey
Measure unit 123, register logical processing unit 124, threshold value comparison unit 125 and coil；
First output end of the control terminal of the LC concussion exciting circuit unit 122 and the probe control unit 15 connects
It connects；
The output end of the LC concussion exciting circuit unit 122 is connect with the input terminal of the driving unit 121；
The output end of the driving unit 121 is connect with the coil；
The output end of the inductance value measuring unit 123 is connect with the input terminal of the register logical processing unit 124；
The output end of the register logical processing unit 124 is connect with the input terminal of the threshold value comparison unit 125；
The output end of the threshold value comparison unit 125 is connect with the input terminal of second communication unit 14.
Further preferably, the coil in the eddy current sensor 12 is PCB print coil.
Further preferably, the number of the eddy current sensor 12 is two, and linearly distribution.
Further preferably, the distance between two described eddy current sensors 12 are 25mm.
Further preferably, first communication unit 13 uses IIC communications protocol.
Further preferably, second communication unit 14 uses SPI communications protocol.
Another aspect of the present invention additionally provides a kind of system for pipeline detection, comprising: detection probe 1 and data
Collector 2；
The detection probe 1 is any one in above-mentioned probe；
The data collector 2 includes: acquisition control unit 21, clock timing unit 22, flash memory cell 23, waveform
Display unit 24 and data input cell 25；
First output end of the acquisition control unit 21, the second output terminal control with the clock timing unit 22 respectively
The connection of the control terminal of end processed and the data input cell 25；
The output end of the clock timing unit 22 is connect with the first input end of the acquisition control unit 21；
The output end of data outputting unit 16 connects in the input terminal of the data input cell 25 and the detection probe 1
It connects；
The output end of the data input cell 25 is connect with the input terminal of the flash memory cell 23；
The output end of the flash memory cell 23 is connect with the second input terminal of the acquisition control unit 21；
The third output end of the acquisition control unit 21 is connect with the input terminal of the waveform display unit 24.
It is preferred that the output end of the data outputting unit 16 of the input terminal of the data input cell 25 and the probe uses
The connection of spi bus agreement.
Further preferably, the data in the flash memory cell 23 are managed storage using FatFs file system.
Provided by the present invention for the probe of pipeline detection, attempted for the first time by leakage field sensor and eddy current sensor simultaneously
It is combined in a detection probe, and then by leakage field sensor to tube wall volume type weld defect control advantage and eddy current sensor pair
The advantage of tube wall near surface flaw sensitivity organically combines, and realization is distinguished and assessed to the inside and outside wall defect of tube wall, has inspection
The advantages that it is accurate to survey, and precision is high.
Provided by the present invention for the system of pipeline detection, above-mentioned the new detector has been used, not only may be implemented pair
The inside and outside wall defect of tube wall is distinguished and is assessed, and has potential detection may near surface crack defect.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the module map that the present invention discloses a kind of probe for pipeline detection that embodiment provides；
Fig. 2 is the module that the present invention discloses eddy current sensor in a kind of probe for pipeline detection that embodiment provides
Figure；
Fig. 3 is the module that the present invention discloses data collector in a kind of system for pipeline detection that embodiment provides
Figure；
Fig. 4 is the software control process that the present invention discloses a kind of probe for pipeline detection that embodiment provides；
Fig. 5 is that the present invention discloses the specific of data collector in a kind of system for pipeline detection that embodiment provides
The schematic diagram of data acquisition storage；
Fig. 6 is the software that the present invention discloses data collector in a kind of system for pipeline detection that embodiment provides
Control flow chart；
Fig. 7 is the master control schematic diagram of STM32.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device being described in detail in claims, some aspects of the invention are consistent.
It is a kind of module map for pipeline detection probe referring to Fig. 1, wherein the probe is mainly by leakage field sensor
11, eddy current sensor 12, the first communication unit 13, the second communication unit 14, probe control unit 15 and data outputting unit
16 are constituted, wherein probe the first output end of control unit 15, second output terminal respectively with the control terminal of leakage field sensor 11 with
And the control terminal connection of eddy current sensor 12, wherein probe control unit 15 is powered by LDO linear stabilized power supply, leakage field
The output end of sensor 11 is connect with the input terminal of the first communication unit 13, the output end of the first communication unit 13 and the head control
The first input end of unit 15 processed connects, and the output end of eddy current sensor 12 is connect with the input terminal of the second communication unit 14, the
The output end of two communication units 14 is connect with the second input terminal of probe control unit 15, the third output of probe control unit 15
End is connect with the input terminal of data outputting unit 16, wherein the first communication unit 13 preferably uses IIC communications protocol, and second is logical
Believe that unit 14 preferably uses SPI communications protocol.
Multiple leakage field sensors can be simutaneously arranged in above-mentioned probe, the number of leakage field sensor in specific embodiment
It is 4, and the number of eddy current sensor is 2, and linearly distribution, the distance between two eddy current sensors are 25mm.
The specific work process of the probe are as follows: leakage field sensor 11 and eddy current sensor are controlled by control unit 15 respectively
12 work, the pipeline data information that leakage field sensor 11 detects can be sent in real time in the first communication unit 13, and first is logical
Letter unit 13, which changes into the pipeline data information received after IIC communication protocol signal, to be sent in probe control unit 15, and
The pipeline data information that eddy current sensor 12 detects can be sent in real time in the second communication unit 14, and the second communication unit 14 will
The pipeline data information received is sent in probe control unit 15 after changing into SPI communication protocol signal, by probe control system
System 15 carries out the acquisition and storage of pipeline data information, while control unit 15 of popping one's head in will lead to from the first communication unit 13 and second
The pipeline data information that letter unit 14 receives is sent to the output that information is carried out in data outputting unit.
Specific software control process can be found in Fig. 4, after program starts, initialize through oversampling clock, and initialization is interrupted
Start to carry out input and output operating mode, opening timing device after the completion of priority, every 0.4ms interrupts primary, guarantee 2.5KHz
Fixed sampling frequency is sampled, and by distinguishing interrupt flag bit, whether set is to 4 road leakage field sensors and 2 road eddy current sensors
Data are acquired and store, and are exported initial data to driving port by SPI protocol.
In specific embodiment, probe control unit 15 selects STM32F103T8U6 main control chip, wherein the master of STM32
Schematic diagram is controlled referring to Fig. 7,2 road eddy current signal LDC MISO1 and LDC MISO2 are acquired and are stored, to 4 tunnel magnetic leakage signals
TLV SDA1, TLV SDA2, TLV SDA3, TLV SDA4 are acquired and store.
It is referring to fig. 2 the module map of eddy current sensor 12, which, which is mainly shaken by driving unit 121, LC, swashs
Encourage circuit unit 122, inductance value measuring unit 123, register logical processing unit 124, threshold value comparison unit 125 and coil
It constitutes, wherein the control terminal of LC concussion exciting circuit unit 122 is connect with the first output end of probe control unit 15, LC shake
The output end for swinging exciting circuit unit 122 is connect with the input terminal of driving unit 121, the output end and coil of driving unit 121
Connection, the output end of inductance value measuring unit 123 are connect with the input terminal of register logical processing unit 124, register logical
The output end of processing unit 124 is connect with the input terminal of threshold value comparison unit 125, the output end of threshold value comparison unit 125 and
The input terminal of two communication units 14 connects.
The course of work of above-mentioned eddy current sensor 12 are as follows: LC is controlled by probe control unit 15 and shakes exciting circuit unit
122 work, when the circuit communication of LC concussion exciting circuit unit 122 provides driving voltage to driving unit 121, driving unit
Impedance variations occur for 121 driving coils, by inductance value detection unit 123 when Coil Detector is to tube wall inner wall or outer wall defect
The detection of inductance value is carried out, and the inductance value that will test is sent to register logical processing unit 124, by register logical
Reason unit 124 is sent to threshold value comparison unit 125 after being handled, and the is sent to after being compared by threshold value comparison unit 125
In two communication units 14, SPI communications protocol output signal is changed by the second communication unit 14, to judge the defect feelings of tube wall
Condition.
Coil in above-mentioned eddy current sensor 12 preferably uses PCB print coil, instead of traditional manual wound around coil, subtracts
Winding volume space is lacked, has increased the stability of coil, and has been hardly damaged.
The present embodiment offer is a kind of system for pipeline detection, comprising: detection probe 1 and data acquisition
Device 2, wherein detection probe 1 is any one in above-mentioned probe, and referring to Fig. 3, data collector 2 is mainly by acquisition control list
Member 21, clock timing unit 22, flash memory cell 23, waveform display unit 24 and data input cell 25 are constituted, acquisition
First output end of control unit 21, second output terminal respectively with the control terminal and data input cell of clock timing unit 22
25 control terminal connection, wherein acquisition control unit 21 has LDO linear stabilized power supply to be powered, clock timing unit 22
Output end is connect with the first input end of acquisition control unit 21, number in the input terminal and detection probe 1 of data input cell 25
It being connected according to the output end of output unit 16, the output end of data input cell 25 is connect with the input terminal of flash memory cell 23,
The output end of flash memory cell 23 is connect with the second input terminal of acquisition control unit 21, and the third of acquisition control unit 21 is defeated
Outlet is connect with the input terminal of waveform display unit 24.
This is used for the specific work process of data collector in the system of pipeline detection are as follows: is controlled by acquisition control unit 21
The clearing and timing of clock timing unit 22 processed, while clock timing unit 22 can be by timing result feedback to acquisition control unit
In 21, acquisition control unit 21 controls data outputting unit 16 of the data input cell 25 from probe according to the timing result of feedback
Middle interval carries out the acquisition of data, and data input cell 25 sends the data information of acquisition in flash memory cell 23 and carries out
Storage, while flash memory cell 23 sends the data information of storage in acquisition control unit 21, acquisition control unit 21
Progress waveform in waveform display unit 24, which is sent, by the data information received shows that user passes through waveform display unit 24
Waveform show can intuitive judgment pipeline actually detected situation.
Wherein, the output end of the data outputting unit 16 of the input terminal and probe of data input cell 25 uses spi bus
Agreement connects, and the data in flash memory cell 23 are managed storage using FatFs file system.
It is the schematic diagram of a specific data acquisition storage referring to Fig. 5, wherein the detection data in probe is communicated by SPI
CSB, SCLK, SDI, the SDO signal of agreement output pass through transmission line to acquisition system, single-chip microcontroller master control selection
ARM-STM32 family chip.Wherein, CLKIN indicates the input of external timing clock, and the external 15nF capacitor of CLDO connects from pin
It is connected to GND, multiple channels can be connected on identical spi bus by CSB expression, and SCLK indicates that SPI communications protocol clock is defeated
Enter, SDI indicates that the input of SPI data is connected to the MOSI of SPI host, and SDO indicates that the output of SPI data is connected to SPI host
MISO, specific software control process can be found in Fig. 6.
Above-mentioned detection system is tested on defective tube wall, demonstrate the detection system can be realized with
Lower function:
1, inside and outside wall defect is distinguished:
1) when leakage field sensor and eddy current sensor measure wall defects simultaneously, distinguish that this defect is inner surface of tube wall
Defect.
2) when leakage field sensor detects wall defects, and eddy current sensor does not detect this defect, this defect is distinguished
For outer surface of tube wall defect.
2, eddy current data correction-compensation magnetic flux leakage data
The design of two eddy current sensors can effectively judge that current signal is since detector shake causes or inner wall
Caused by defect.
Leakage field sensor is high to the edge contour quantified precision of volume flaw when detecting wall defects, but to depth
Quantified precision up to 78%, can completely does not embody the depth of defect.And eddy current sensor is very sensitive on lift-off value influence,
Lift-off value so as to be parsed using eddy current data is inversely modified magnetic flux leakage data, improves to depth of defect quantified precision.
3, crackle is surveyed
Traditional leakage field sensor is unobvious to tube wall crackle, and eddy current sensor has obviously near surface crackle in tube wall
Variation, may to crack information offer is excavated after fusion magnetic flux leakage data.
4, calorimetric influence area
In the distance of girth joint both ends 20mm, as two segment pipes in the welding process caused by heat affecting be formed by
The variation of magnetic conductivity caused by heat-affected zone causes distortion to magnetic flux leakage, and leakage field method is difficult to measure the area defects information.
Eddy current sensor is utilized in this programme, increases the pick-up capability in heat-affected zone vortex to defect.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (10)
1. a kind of probe for pipeline detection characterized by comprising leakage field sensor (11), eddy current sensor (12),
First communication unit (13), the second communication unit (14), probe control unit (15) and data outputting unit (16)；
First output end of probe control unit (15), the second output terminal control with the leakage field sensor (11) respectively
The connection of the control terminal of end and the eddy current sensor (12)；
The output end of the leakage field sensor (11) is connect with the input terminal of first communication unit (13)；
The output end of first communication unit (13) is connect with the first input end of probe control unit (15)；
The output end of the eddy current sensor (12) is connect with the input terminal of second communication unit (14)；
The output end of second communication unit (14) is connect with the second input terminal of probe control unit (15)；
The third output end of probe control unit (15) is connect with the input terminal of the data outputting unit (16).
2. being used for the probe of pipeline detection according to claim 1, which is characterized in that eddy current sensor (12) packet
Include: driving unit (121), LC concussion exciting circuit unit (122), inductance value measuring unit (123), register logical processing are single
First (124), threshold value comparison unit (125) and coil；
First output end of the control terminal of LC concussion exciting circuit unit (122) and probe control unit (15) connects
It connects；
The output end of LC concussion exciting circuit unit (122) is connect with the input terminal of the driving unit (121)；
The output end of the driving unit (121) is connect with the coil；
The output end of the inductance value measuring unit (123) is connect with the input terminal of the register logical processing unit (124)；
The output end of the register logical processing unit (124) is connect with the input terminal of the threshold value comparison unit (125)；
The output end of the threshold value comparison unit (125) is connect with the input terminal of second communication unit (14).
3. being used for the probe of pipeline detection according to claim 2, which is characterized in that in the eddy current sensor (12)
Coil is PCB print coil.
4. being used for the probe of pipeline detection according to claim 1, which is characterized in that of the eddy current sensor (12)
Number is two, and linearly distribution.
5. being used for the probe of pipeline detection according to claim 4, which is characterized in that two eddy current sensors (12)
The distance between be 25mm.
6. being used for the probe of pipeline detection according to claim 1, which is characterized in that first communication unit (13) is adopted
With IIC communications protocol.
7. being used for the probe of pipeline detection according to claim 1, which is characterized in that second communication unit (14) is adopted
With SPI communications protocol.
8. a kind of system for pipeline detection characterized by comprising detection probe (1) and data collector (2)；
The detection probe (1) is any one in claim 1~7 probe；
The data collector (2) include: acquisition control unit (21), clock timing unit (22), flash memory cell (23),
Waveform display unit (24) and data input cell (25)；
First output end of the acquisition control unit (21), the second output terminal control with the clock timing unit (22) respectively
The connection of the control terminal of end processed and the data input cell (25)；
The output end of the clock timing unit (22) is connect with the first input end of the acquisition control unit (21)；
The output end of data outputting unit (16) connects in the input terminal of the data input cell (25) and the detection probe (1)
It connects；
The output end of the data input cell (25) is connect with the input terminal of the flash memory cell (23)；
The output end of the flash memory cell (23) is connect with the second input terminal of the acquisition control unit (21)；
The third output end of the acquisition control unit (21) is connect with the input terminal of the waveform display unit (24).
9. being used for the system of pipeline detection according to claim 8, which is characterized in that the data input cell (25)
Input terminal is connect with the output end of the data outputting unit (16) of the probe using spi bus agreement.
10. being used for the system of pipeline detection according to claim 8, which is characterized in that the flash memory cell (23)
In data storage is managed using FatFs file system.
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| CN201810766190.6A CN108982658B (en) | 2018-07-12 | 2018-07-12 | Probe for detecting in pipeline and system thereof |
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| CN201810766190.6A CN108982658B (en) | 2018-07-12 | 2018-07-12 | Probe for detecting in pipeline and system thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN117110417A (en) * | 2022-11-22 | 2023-11-24 | 北华航天工业学院 | Eddy current probe circuit system during magnetic leakage-eddy current composite detection |
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