CN110108788A - Integration probe and detection method are detected in pipe leakage based on impulse eddy current - Google Patents
Integration probe and detection method are detected in pipe leakage based on impulse eddy current Download PDFInfo
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- CN110108788A CN110108788A CN201910401319.8A CN201910401319A CN110108788A CN 110108788 A CN110108788 A CN 110108788A CN 201910401319 A CN201910401319 A CN 201910401319A CN 110108788 A CN110108788 A CN 110108788A
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- eddy current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The present invention provides detect integration probe in a kind of pipe leakage based on impulse eddy current, which is characterized in that including Pulsed eddy current testing unit and three-dimensional Magnetic Flux Leakage Inspecting unit.There is provided detection methods in a kind of pipe leakage based on impulse eddy current using above-mentioned probe for another technical solution of the invention.The problem of leakage field of the present invention, vortex integrated probe are solved conventional flux leakage detector and are popped one's head in bring detector increased costs using two sections, and elbow passability and deformation adaptability are deteriorated, are easy to appear blocking.It is accurate that method fast response time provided by the present invention, high sensitivity, low in energy consumption, inside and outside wall defect are distinguished, can application in engineering.
Description
Technical field
The invention belongs to pipe leakage inner detection technique field, be related to a kind of pipeline detection defect three-dimensional magnetic leakage measurement and
Inside and outside wall defect area divides integration probe and identification and evaluation method.
Background technique
Detection is under conditions of not influencing oil-gas pipeline medium and normally conveying, using in detection device in pipe leakage
Magnetizing system carries out pipeline local magnetized, by Hall sensor detect the vector size of fault location magnetic leakage signal, direction and
Distribution, the geometric dimension of precise quantification defect.Traditional leakage field internal detector is using two section sonde configurations: the first section structure includes
Hall sensor, for the size and Orientation of quantitative measurment defect；Second section structure includes inside and outside wall defect distinguishing sensor,
It is in inner wall of the pipe or outer wall for qualitative differentiation defect.Currently, through frequently with the EDDY CURRENT conduct based on phase sensitive detection
The method that inside and outside wall is distinguished.Eddy current detection method is a kind of lossless detection method of non-cpntact measurement, is primarily adapted for use in metal material
The defects detection of material.Traditional eddy detection technology is synchronous and orthogonal using two-way using periodic sine wave as pumping signal
Phase sensitive detection reference signal, the resistive component and induction reactance component of test coil of eddy current are obtained after low-pass filtering, is most passed through afterwards
Digital Signal Processing is crossed, the amplitude information and phase information of fault location signal are calculated.The length and height of amplitude reflection defect
Information, the lag and leading reflection defect of phase are the inner wall or outer wall positioned at pipeline.This method is due to using number letter
Number processor brings the problem that circuit structure is complicated, consumption is high, response speed is slow, thus inspection in strong influence pipe leakage
The detection speed of survey.
Pulsed eddy current testing technology is a kind of novel detection side developed on the basis of traditional eddy detection technology
Method.Pulsed eddy current testing based on faraday electromagnetic induction principle, when the detection coil for being connected with rectangular wave move closer to by
When surveying metal specimen, generation vortex can be incuded in test specimen.And secondary induced magnetic field caused by eddy current can react on
Detection coil, to induce voltage in detection coil.The size of induced voltage is influenced by the size and shape of defect, is passed through
Measurement induced voltage can be inferred to tube wall with the presence or absence of defect.There is Pulsed eddy current testing technology frequency spectrum to enrich, response is fast
The advantage that degree is fast, deep zone defect detectability is strong.
102798660 B of Chinese patent CN describes the inner and outer walls of pipeline defects detection based on three-dimensional leakage field and current vortex
Device and method.The flux leakage detector and vortex sensor is located at the two sides of data processing and memory, between the two
Away from least 0.5m, only when flux leakage detector detects abnormal signal, vortex sensor is just opened.The patent leakage field and vortex
It positioned at different parts, is switched over using variable connector, belongs to the design of detection device, be not related to impulse eddy current technology, less
It is related to the design of pipeline detection probe.
102192953 A of Chinese patent CN, describes a kind of low-power consumption intelligent three-dimensional magnetic leakage detecting probe, which can
To carry out X, Y and Z quantitative measurment to defect, it cannot judge that defect is to be located at inner wall or outer wall.
Document " defect recognition technical research inside and outside detection tube wall in eddy current pipeline ", using vortex Impedance Analysis, uses
Sinusoidal ac signal is as coil excitation signals, and when coil encounters defect, the total impedance of fault location circuit can cause voltage
Variation.The Patent design bridge-type eddy current probe and peripheral hardware circuit carry out the amplitude of EDDY CURRENT output signal real-time
Acquisition, storage, realize the differentiation of inner and outer walls of pipeline defect.But method itself is not related to Pulsed eddy current testing technology, less relates to
And signal acquisition method.
Summary of the invention
The technical problem to be solved by the present invention is traditional flux leakage detector using two sections pop one's head in, using separate installment,
Equipment volume is huge, heavy caused mechanical failure, cost are big.
In order to solve the above-mentioned technical problem, there is provided a kind of pipes based on impulse eddy current for a technical solution of the invention
Integration probe is detected in road leakage field, N number of integration probe is arranged circumferentially along pipeline to be detected, which is characterized in that each
The integration probe includes Pulsed eddy current testing unit and three-dimensional Magnetic Flux Leakage Inspecting unit, wherein three-dimensional Magnetic Flux Leakage Inspecting unit is used for
Three-dimensional magnetic leakage measurement radially, axially is carried out with circumferential to the defect of pipeline, obtains the structural information of defect；
Pulsed eddy current testing unit, the defect for measuring pipeline are located at inner wall of the pipe or pipeline outer wall, obtain defect
Location information, including impulse eddy current exciting circuit, impulse eddy current electric bridge, difference current measuring circuit, differential voltage measurement electricity
Road and central processing unit, in which:
Impulse eddy current exciting circuit is used to generate vortex pumping signal under the control of central processing unit；
Impulse eddy current electric bridge includes measurement bridge arm and refers to bridge arm, and vortex pumping signal is loaded into measurement bridge arm and with reference to bridge
Emission space alternating magnetic field after arm carries out electromagnetic excitation to pipeline, by difference current measuring circuit and differential voltage measuring circuit
Detection measurement bridge arm and difference current and differential voltage with reference to bridge arm respectively；When the inner wall of tube wall does not have defect, pulse whirlpool
Galvanic electricity bridge reaches balance；When the inner wall existing defects of tube wall, by central processing unit collect difference current measuring circuit and
The difference current and differential voltage of differential voltage measuring circuit output；
Difference conductance is calculated according to collected difference current and differential voltage in central processing unit, according to difference conductance
Data and curves obtain the location information of defect.
It preferably, further include data acquisition circuit, after converting digital quantity for the difference current and differential voltage
It exports to the central processing unit.
Preferably, the three-dimensional Magnetic Flux Leakage Inspecting unit includes three axis Hall sensors of multiple parallel array formulas arrangements, and three
The quantity of axis Hall sensor is determined according to the width of the integration probe and the width of each three axis Hall sensor.
Preferably, the impulse eddy current electric bridge has at least one set, axis of all impulse eddy current electric bridges along the pipeline
It arranges forwards, backwards.
Preferably, the measurement bridge arm include measuring coil and with the concatenated resistance of measuring coil, vortex excitation letter
Emit the space alternating magnetic field after number being loaded into measuring coil；It is described with reference to bridge arm include reference coil and with reference coil string
The resistance of connection, the vortex pumping signal emit the space alternating magnetic field after being loaded into reference coil.
There is provided detection sides in a kind of pipe leakage using above-mentioned integration probe for another technical solution of the invention
Method, which is characterized in that the structure and location information of the defect of pipeline are obtained in conjunction with three-dimensional magnetic leakage signal and impulse eddy current signal, it is complete
At non-destructive testing, comprising the following steps:
Step 1: defect three-dimensional quantitative measurement
N number of above-mentioned integration probe being arranged circumferentially along pipeline to be detected, when N number of integration probe edge in the duct
When sliding axially, three-dimensional Magnetic Flux Leakage Inspecting unit constantly carries out the tube wall of pipeline radially, axially quantitative with circumferential three-dimensional leakage field
Measure the dimension information to obtain defect length；
Step 2: the vortex pumping signal of output is loaded on measurement bridge arm and reference bridge arm by impulse eddy current exciting circuit,
By measurement bridge arm and bridge arm emission space alternating magnetic field is referred to, electromagnetic excitation is carried out to pipeline；
Step 3: vortex bridge arm electric signal measurement
If the pipeline that integration probe passes through is without inner wall defect, impulse eddy current electric bridge reaches balance；If integration probe passes through
Inner wall of the pipe existing defects when, central processing unit collects shape by difference current measuring circuit and differential voltage measuring circuit
At differential voltage and difference current；
Step 4: difference conductance calculates
Difference conductance is calculated according to the differential voltage and difference current of measurement in central processing unit；
Step 5: central processing unit forms differential electrical guided wave shape according to the difference conductance being calculated, when integration probe passes through
When the inner wall of pipeline is defective, there is the waveform of negative peak after preceding positive peak in the differential electrical guided wave shape that measures；Pipeline it is interior
When wall does not have defect, differential electrical guided wave shape does not have peak signal generation；
Step 6: defective locations judgement
The waveform of positive peak, then can determine whether out after having preceding negative peak in the data and curves of three-dimensional magnetic leakage signal radial component
Defective signal；When three-dimensional magnetic leakage measurement is to defective signal, in conjunction with step 5, if having preceding posivtive spike in differential electrical guided wave shape
The waveform of negative peak after value then judges that defect is located at the inner wall of pipeline；When three-dimensional magnetic leakage measurement is to defective signal, and it is poor
Point conductance waveform does not have peak value waveform, then defect is located at the outer wall of pipeline.
Preferably, the vortex pumping signal is the rectangle PWM wave that duty ratio is 50%.
The present invention provides integration probe and detection method are detected in a kind of leakage field.The probe uses the original of impulse eddy current
Reason devises a kind of novel signal acquisition circuit and detection method, and defect can only be detected by solving general pulse eddy current probe,
It cannot judge that defect is the problem of being located at inner wall or outer wall.Meanwhile probe be integrated with three-dimensional leakage field sensor, can to defect into
Row quantitative measurment obtains the structural information of defect.
Leakage field of the present invention, vortex integrated probe are solved conventional flux leakage detector and are popped one's head in bring detector using two sections
The problem of increased costs, elbow passability and deformation adaptability are deteriorated, are easy to appear blocking.Method response provided by the present invention
Speed is fast, high sensitivity, low in energy consumption, the differentiation of inside and outside wall defect is accurate, can application in engineering.
Detailed description of the invention
Fig. 1 is integration probe placement schematic in the duct；
Fig. 2 is integration probe three-dimensional Magnetic Flux Leakage Inspecting unit and Pulsed eddy current testing cell position schematic diagram；
Fig. 3 is vortex bridge measurement principle figure；
Fig. 4 is vortex bridge circuit configuration figure；
Fig. 5 is impulse eddy current exciting circuit；
Fig. 6 is REF generation circuit；
Fig. 7 is eddy current coil current measurement circuit；
Fig. 8 is vortex electric bridge differential voltage measuring circuit；
Fig. 9 is analog/digital conversion circuit；
Figure 10 is vortex bridge signal waveform sampling timing；
Figure 11 is vortex bridge signal collecting flowchart；
Figure 12 is defect of pipeline inside and outside wall differentiating method.
Specific embodiment
With reference to the accompanying drawing, the present invention is further explained.It should be understood that these embodiments are merely to illustrate the present invention and do not have to
In limiting the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art can be with
The present invention is made various changes or modifications, such equivalent forms equally fall within model defined by the application the appended claims
It encloses.
In a kind of pipe leakage based on impulse eddy current provided in this embodiment detect integration probe its inside pipeline
For layout as shown in Figure 1,1-1 is pipeline in figure, 1-2 is a series of integration probes provided by the invention being circumferentially laid out along pipeline.
1-3 is the Hall sensor inside integration probe, and Hall sensor is circumferentially placed along pipeline 1-1.1-4 is inside integration probe
Eddy current measurement coil, 1-5 are the vortex reference coil inside integration probe, eddy current measurement coil 1-4 and vortex reference coil 1-5
It is axially placed along pipeline 1-1.
In the present embodiment, integration probe provided by the invention includes three-dimensional Magnetic Flux Leakage Inspecting unit and Pulsed eddy current testing list
Member, three-dimensional Magnetic Flux Leakage Inspecting unit and the signal of Pulsed eddy current testing cell position are as shown in Figure 2.Three-dimensional Magnetic Flux Leakage Inspecting unit is by 5
Along pipeline circumferential array three axis Hall sensor H1, H2, H3, H4, H5 form, 5 three axis Hall sensor H1, H2, H3,
H4, H5 two-by-two circumferential center away from for 5mm, the leakage field intensity in tri- directions X-Y-Z for measuring defect.Three axis Hall sensors
Quantity determined according to the overall width of the width of three axis Hall sensors itself and integration probe provided by the invention, with convenient
The installation of three axis Hall sensors is advisable.Three axis Hall sensor H1, H2, H3, H4, H5 in the present embodiment possess 16 magnetic fields
Resolution ratio can detecte the magnetic field strength of 1050mT, have many advantages, such as small in size, low in energy consumption.Three-dimensional Magnetic Flux Leakage Inspecting unit
Rear is Pulsed eddy current testing unit, including two groups of EDDY CURRENT electric bridges.Every group of EDDY CURRENT electric bridge includes measuring coil and ginseng
Examine coil.Measuring coil and reference coil be eddy current coil, and eddy current coil is using 50 circles, internal diameter 6.2mm, line footpath 0.1mm
Enameled wire coiling forms.The circumferential center of eddy current coil is away from for 21mm, and axial centre is away from for 23.5mm.Pulsed eddy current testing unit
On former and later two eddy current coils be respectively that measuring coil and reference coil constitute one group of EDDY CURRENT electric bridge, i.e. eddy current measurement line
It encloses MEA1 series resistance one and vortex reference coil REF1 series resistance two constitutes one group of vortex electric bridge, eddy current measurement coil MEA2
Series resistance three and vortex reference coil REF2 series resistance four constitute another group of vortex electric bridge.
Two groups of EDDY CURRENTs use identical testing principle.Wherein the measuring principle of one group of EDDY CURRENT is as shown in Figure 3.When
When pipeline does not have inner wall defect, EDDY CURRENT electric bridge reaches flat by measurement bridge arm and with reference to concatenated resistance R1, R2 on bridge arm
Weighing apparatus.When EDDY CURRENT electric bridge encounters the pipeline with inner wall defects such as burn into crackles, due to measuring coil MEA1 and reference line
The time for enclosing REF1 disengaging defect is different, can cause voltage difference on the bridge arm of EDDY CURRENT electric bridge.Differential voltage measuring circuit
The differential voltage V between measuring coil and reference coil is acquired by the calculus of differences amplifying circuit of designDIFF1=V1-V2.Together
When, the presence of defect will cause the electric current in measuring coil and reference coil inconsistent, form difference current.Difference current is surveyed
Amount circuit is by being converted to voltage U for the bridge arm current in measuring coil and reference coil across resistance amplificationI1And UI2, central processing
Device (in the present embodiment, central processing unit uses CPLD) is by mathematical operation, by two voltage UI1And UI2It is converted to measurement bridge arm
Difference current I between reference bridge armDIFF1.With difference current divided by differential voltage, the differential electrical of vortex electric bridge can be obtained
Lead C=IDIFF1/UDIFF1.According to the waveform of aforementioned difference conductance, it can show that defect is to be located at inner wall of the pipe or outer wall.
Such as the circuit structure diagram that Fig. 4 is any group of EDDY CURRENT electric bridge.By impulse eddy current exciting circuit, measuring coil, ginseng
Examine coil, measure coil currents sample circuit, reference coil current sampling circuit, vortex bridge arm differential voltage sample circuit, mould/
Number conversion circuit and CPLD composition.The output for being vortexed bridge arm differential voltage sample circuit is the voltage of measuring coil and reference coil
Difference.
Fig. 5 is impulse eddy current exciting circuit.In figure, PWMA is the square wave letter that CPLD controls lower Symmetrical, frequency is 33k
Number carry out drive analog switch.The output of analog switch by amplifier follow circuit with enhance vortex pumping signal MOA driving capability,
It is vortexed the voltage signal that pumping signal MOA is 1.65 ± 1.5V.R3=5.1K, R4=5.1K, R5=24K, R6=27K.
As PWMA=1:
As PWMA=0:
In above structure and subsequent conditioning circuit using to voltage reference VREF generation circuit as shown in fig. 6 ,+3.3VA passes through
Two substitutional resistances are divided, and voltage follower circuit is recycled to improve the driving capability of signal, VREF=+1.65V.
Fig. 7 is eddy current measurement coil current measuring circuit.The electric current flowed through in eddy current measurement coil passes through I1Amplify across resistance
Become voltage signal VI1, amplification factor Rg.The then electric current I of measuring coil1For I1=VI1/Rg
Similarly, it is vortexed the electric current I of reference coil2By being converted to V across resistance amplificationI2.Then difference current IDIFF1=I1-I2。
Fig. 8 is differential voltage measuring circuit.The circuit includes two amplifiers, and two amplifiers form differential amplifier circuit.It surveys
The voltage of amount line coil and a reference coil is respectively fed to the non-inverting input terminal of amplifier, generates a bridge arm differential voltage VDIFF1。VDIFF1
=V1-V2。
Fig. 9 is analog/digital conversion circuit.In view of the conversion speed of signal, signal acquisition circuit uses 16 SAR type ADC.
The supply voltage of ADC is+3.3V, and benchmark is set as+2.5V, using single-ended connection.
Figure 10 is the sampling time sequence figure of position signal waveform.Apply the vortex that a cycle is 30us on eddy current coil to motivate
Signal MOA (speed that the frequency of signal can advance with internal detector is different and changes).The period is divided into three parts:
First part: positive half cycle measurement period, since the 5us in the period, data acquisition circuit ADC can be successively read
Differential voltage value VDIFF1, eddy current measurement bridge arm current I1Corresponding voltage VI1Bridge arm current I is referred to vortex2Corresponding voltage
VI2。
Second part: negative semiaxis measurement period, since the 5us in the period, data acquisition circuit ADC can read difference
Voltage VDIFF1, eddy current measurement bridge arm current I1Corresponding voltage VI1Bridge arm current I is referred to vortex2Corresponding voltage VI2。
Part III: calculating cycle, 10us, central processing unit CPLD since vortex excitation positive half cycle and negative half period
The difference current that vortex bridge arm can be calculated obtains IDIFF1=I1-I2, and according to the obtained differential voltage of measurement and differential electrical flowmeter
Calculate the electric conductivity value of fault location
It is the covering surface for increasing defect using the purpose that two groups of EDDY CURRENT electric bridges are placed in parallel, specific implementation detailed rules and regulations are such as
Under: it, then may be there are two types of happening after two groups of vortex electric bridges have preceding positive peak when the signal of negative peak, the first is two
Group vortex electric bridge detects the big defect of the same inner wall, and second is that two groups of vortex electric bridges detect two or more neighbour's inner walls
Defect.Etc. specific judgement is detected and is completed in needing etc., i.e., probe provided by the invention will scan through entire pipeline in the axial direction to count
It is the first or second according to inversion algorithm judgement after offline export.If two groups of vortex electric bridges, first group have before just
The signal of negative peak after peak value, second group does not have peak signal, then may determine that first group is an inner wall defect, and second group
It needs to combine magnetic leakage signal, to judge to be outer wall defect again without defect.
Figure 11 is the signal acquisition process of invention.After program starts, central processing unit can acquire always three-dimensional magnetic flux leakage data,
And open vortex excitation.By the differential voltage and difference current at acquisition measuring coil and reference coil, difference conductance is obtained.
Later, program can judge magnetic leakage signal, when determining leakage field has peak signal, believe further according to the peak value of difference conductance
Breath show that defect is in inner wall or outer wall.When determining leakage field does not have signal, then terminate program, is followed into next
Ring.
Figure 12 is detection method in the pipe leakage based on impulse eddy current.When probe is by inner wall of the pipe defect, pulse
The difference conductance of EDDY CURRENT unit has the waveform generation of negative peak after first positive peak, and three axis of three-dimensional Magnetic Flux Leakage Inspecting unit are suddenly
Your sensor has the waveform generation of positive peak after a first negative peak on the radial component.When probe passes through pipeline outer wall defect
When, impulse eddy current conductance does not have the waveform of peak value to generate, and the radial component of three axis Hall sensors has a first negative peak
The waveform of positive peak generates afterwards.So the position of defect can be distinguished by three-dimensional magnetic leakage signal combination impulse eddy current signal
It sets, is in inner wall of the pipe or outer wall.And three-dimensional Magnetic Flux Leakage Inspecting unit can measure the leakage field component of X, Y and Z, to the knot of defect
Structure carries out quantitative analysis.
Claims (7)
1. detecting integration probe in a kind of pipe leakage based on impulse eddy current, week of N number of integration probe along pipeline to be detected
To being evenly arranged, which is characterized in that each integration probe includes Pulsed eddy current testing unit and three-dimensional Magnetic Flux Leakage Inspecting unit,
Wherein,
Three-dimensional Magnetic Flux Leakage Inspecting unit radially, axially carries out three-dimensional magnetic leakage measurement with circumferential for the defect to pipeline, must fall vacant
Sunken structural information；
Pulsed eddy current testing unit, the defect for measuring pipeline are located at inner wall of the pipe or pipeline outer wall, obtain the position of defect
Confidence breath, including impulse eddy current exciting circuit, impulse eddy current electric bridge, difference current measuring circuit, differential voltage measuring circuit and
Central processing unit, in which:
Impulse eddy current exciting circuit is used to generate vortex pumping signal under the control of central processing unit；
Impulse eddy current electric bridge includes measurement bridge arm and refers to bridge arm, and vortex pumping signal is loaded into measurement bridge arm and with reference to after bridge arm
Emission space alternating magnetic field carries out electromagnetic excitation to pipeline, is distinguished by difference current measuring circuit and differential voltage measuring circuit
Detection measurement bridge arm and difference current and differential voltage with reference to bridge arm；When the inner wall of tube wall does not have defect, impulse eddy current electricity
Bridge reaches balance；When the inner wall existing defects of tube wall, difference current measuring circuit and difference are collected by central processing unit
The difference current and differential voltage of tension measuring circuit output；
Difference conductance is calculated according to collected difference current and differential voltage in central processing unit, according to the number of difference conductance
The location information of defect is obtained according to curve.
2. detecting integration probe in a kind of pipe leakage based on impulse eddy current as described in claim 1, which is characterized in that also
Including data acquisition circuit, for output after converting digital quantity for the difference current and differential voltage to the central processing
Device.
3. detecting integration probe in a kind of pipe leakage based on impulse eddy current as described in claim 1, which is characterized in that institute
State the three axis Hall sensors that three-dimensional Magnetic Flux Leakage Inspecting unit includes multiple parallel array formula arrangements, the quantity of three axis Hall sensors
It is determined according to the width of the width of the integration probe and each three axis Hall sensor.
4. detecting integration probe in a kind of pipe leakage based on impulse eddy current as described in claim 1, which is characterized in that institute
Stating impulse eddy current electric bridge has at least one set, axially back and forth arrangement of all impulse eddy current electric bridges along the pipeline.
5. detecting integration probe in a kind of pipe leakage based on impulse eddy current as claimed in claim 4, which is characterized in that institute
State measurement bridge arm include measuring coil and with the concatenated resistance of measuring coil, after the vortex pumping signal is loaded into measuring coil
Emit the space alternating magnetic field；It is described with reference to bridge arm include reference coil and with the concatenated resistance of reference coil, the vortex
Pumping signal emits the space alternating magnetic field after being loaded into reference coil.
6. detection method in a kind of pipe leakage using integration probe described in claim 1, which is characterized in that leaked in conjunction with three-dimensional
Magnetic signal and impulse eddy current signal obtain the structure and location information of the defect of pipeline, complete non-destructive testing, comprising the following steps:
Step 1: defect three-dimensional quantitative measurement
N number of integration probe as described in claim 1 being arranged circumferentially along pipeline to be detected, when N number of integration probe exists
When sliding axially in pipeline, three-dimensional Magnetic Flux Leakage Inspecting unit constantly carries out the radially, axially three-dimensional with circumferential direction to the tube wall of pipeline
Leakage field quantitative measurment is to obtain the dimension information of defect length；
Step 2: the vortex pumping signal of output is loaded on measurement bridge arm and reference bridge arm by impulse eddy current exciting circuit, by surveying
It measures bridge arm and refers to bridge arm emission space alternating magnetic field, electromagnetic excitation is carried out to pipeline；
Step 3: vortex bridge arm electric signal measurement
If the pipeline that integration probe passes through is without inner wall defect, impulse eddy current electric bridge reaches balance；If the pipe that integration probe passes through
For road inner wall there are when inner wall defect, central processing unit collects difference by difference current measuring circuit and differential voltage measuring circuit
Component voltage and difference current；
Step 4: difference conductance calculates
Difference conductance is calculated according to the differential voltage and difference current of measurement in central processing unit；
Step 5: central processing unit forms differential electrical guided wave shape according to the difference conductance being calculated, when integration probe is through piping
Inner wall it is defective when, have the waveform of negative peak after preceding positive peak in the differential electrical guided wave shape that measures；Pipeline without interior
When wall defect, differential electrical guided wave shape does not have peak signal generation；
Step 6: defective locations judgement
The waveform of positive peak, then can determine whether out scarce after having preceding negative peak in the data and curves of three-dimensional magnetic leakage signal radial component
Fall into signal；When measuring defective signal, in conjunction with step 5, if there is negative peak after preceding positive peak in differential electrical guided wave shape
Waveform then judges that defect is located at the inner wall of pipeline；When measuring defective signal, and differential electrical guided wave shape does not have peak value wave
Shape, then defect is located at the outer wall of pipeline.
7. detection method in a kind of pipe leakage based on impulse eddy current as claimed in claim 6, which is characterized in that the whirlpool
Stream pumping signal is the rectangle PWM wave that duty ratio is 50%.
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| CN201910401319.8A CN110108788B (en) | 2019-05-15 | 2019-05-15 | Pipeline magnetic flux leakage internal detection integrated probe based on pulse eddy current and detection method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337567A (en) * | 2020-03-27 | 2020-06-26 | 南京航空航天大学 | Defect type evaluation method based on eddy current and magnetic flux leakage detection signal fusion |
| CN113030246A (en) * | 2020-12-14 | 2021-06-25 | 陕西泰诺特检测技术有限公司 | Pipeline outer wall magnetic leakage detector |
| CN113483650A (en) * | 2021-06-26 | 2021-10-08 | 山东航天电子技术研究所 | Novel eddy current sensor measuring method |
| CN113933382A (en) * | 2021-12-16 | 2022-01-14 | 国机传感科技有限公司 | Device and method for acquiring and recording pipeline defect data |
| 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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| CN111337567A (en) * | 2020-03-27 | 2020-06-26 | 南京航空航天大学 | Defect type evaluation method based on eddy current and magnetic flux leakage detection signal fusion |
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| CN113030246B (en) * | 2020-12-14 | 2024-04-09 | 陕西泰诺特检测技术有限公司 | Magnetic leakage detector for outer wall of pipeline |
| CN113483650A (en) * | 2021-06-26 | 2021-10-08 | 山东航天电子技术研究所 | Novel eddy current sensor measuring method |
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| CN113933382B (en) * | 2021-12-16 | 2022-03-11 | 国机传感科技有限公司 | Device and method for acquiring and recording pipeline defect data |
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