CN110108788B - Pipeline magnetic flux leakage internal detection integrated probe based on pulse eddy current and detection method - Google Patents
Pipeline magnetic flux leakage internal detection integrated probe based on pulse eddy current and detection method Download PDFInfo
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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
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- 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 invention provides an integrated probe for detecting pipeline magnetic leakage internally based on pulse eddy current, which is characterized by comprising a pulse eddy current detection unit and a three-dimensional magnetic leakage detection unit. The invention further provides a pipeline magnetic leakage internal detection method based on the pulse eddy current by adopting the probe. The magnetic flux leakage and eddy current integrated probe solves the problems that the conventional magnetic flux leakage detector adopts two probes, so that the detector cost is increased, the elbow passing performance and the deformation adaptability are poor, and blocking is easy to occur. The method provided by the invention has the advantages of high response speed, high sensitivity, low power consumption and accurate inner and outer wall defect distinguishing, and can be applied and popularized in engineering.
Description
Technical Field
The invention belongs to the technical field of pipeline magnetic flux leakage internal detection, and relates to a three-dimensional magnetic flux leakage measurement and inner and outer wall defect distinguishing integrated probe for detecting defects in a pipeline and an identification and evaluation method.
Background
The pipeline magnetic leakage internal detection is that under the condition of not influencing the normal conveying of oil and gas pipeline media, a magnetization system in a detection device is utilized to carry out local magnetization on a pipeline, and the vector size, direction and distribution of magnetic leakage flux signals at the position of a defect are detected through a Hall sensor, so that the geometric dimension of the defect is accurately quantized. The traditional magnetic leakage internal detector adopts a two-section probe structure: the first section of structure comprises a Hall sensor used for quantitatively measuring the size and the direction of the defect; the second section of the structure contains an inner and outer wall defect distinguishing sensor for qualitatively distinguishing whether the defect is on the inner wall or the outer wall of the pipeline. At present, eddy current detection based on phase sensitive detection is often adopted as a method for distinguishing the inner wall from the outer wall. The eddy current detection method is a non-destructive detection method of non-contact measurement, and is mainly suitable for defect detection of metal materials. The traditional eddy current detection technology takes periodic sine waves as excitation signals, adopts two paths of synchronous and orthogonal phase-sensitive detection reference signals, obtains resistance components and inductive reactance components of the eddy current detection coil after low-pass filtering, and finally calculates amplitude information and phase information of signals at the defect position through digital signal processing. The amplitude reflects the length and height information of the defect, and the lag and lead of the phase reflects whether the defect is located on the inner or outer wall of the pipe. The method adopts the digital signal processor, which brings the problems of complex circuit structure, high consumption and slow response speed, thereby greatly influencing the detection speed of the detection in the pipeline magnetic leakage.
The pulsed eddy current inspection technology is a novel inspection method developed on the basis of the traditional eddy current inspection technology. The pulse eddy current detection is based on the Faraday electromagnetic induction principle, and when a detection coil which is communicated with a rectangular wave is gradually close to a metal test piece to be detected, eddy current can be induced in the test piece. And a secondary induction magnetic field generated by the eddy current can react on the detection coil, so that voltage is induced on the detection coil. The magnitude of the induced voltage is influenced by the size and shape of the defect, and whether the pipe wall has the defect can be deduced by measuring the induced voltage. The pulse eddy current detection technology has the advantages of rich frequency spectrum, high response speed and strong deep defect detection capability.
Chinese patent CN 102798660B introduces a device and a method for detecting defects of inner and outer walls of a pipeline based on three-dimensional magnetic flux leakage and eddy current. Leakage magnetic detector and eddy current detector be located the both sides of data processing and memory respectively, both intervals are 0.5m at least, only when leakage magnetic detector detects abnormal signal, eddy current detector just opens. This patent magnetic leakage and vortex are located different positions, adopt multi-way switch to switch over, belong to detection device's design, do not relate to pulse vortex technique, do not more relate to the design of test probe in the pipeline.
Chinese patent application CN 102192953A introduces a low-power consumption intelligent three-dimensional magnetic flux leakage detection probe, which can perform X, Y and Z quantitative measurement on defects, and cannot judge whether the defects are located on the inner wall or the outer wall.
In the literature, "identification technology research for defects inside and outside a pipe wall in an eddy current pipeline", an eddy current impedance analysis method is used, a sinusoidal alternating current signal is used as a coil excitation signal, and when a coil touches a defect, the total impedance of a circuit at the defect can cause the change of voltage. This patent has designed bridge type vortex probe and peripheral hardware circuit, carries out real-time acquisition, storage to the amplitude of eddy current testing output signal, realizes the differentiation of pipeline inside and outside wall defect. But the method does not relate to the pulsed eddy current detection technique per se, nor to the signal acquisition method.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the traditional magnetic flux leakage detector adopts two probes, adopts separated installation, and has large equipment volume, mechanical failure caused by heavy weight and high cost.
In order to solve the technical problems, one technical scheme of the invention provides an integrated probe for detecting magnetic leakage of a pipeline based on pulse eddy current, wherein N integrated probes are uniformly arranged along the circumferential direction of the pipeline to be detected;
the pulse eddy current detection unit is used for measuring whether the defect of the pipeline is positioned on the inner wall or the outer wall of the pipeline to obtain the position information of the defect, and comprises a pulse eddy current excitation circuit, a pulse eddy current bridge, a differential current measurement circuit, a differential voltage measurement circuit and a central processing unit, wherein:
the pulse eddy current excitation circuit is used for generating an eddy current excitation signal under the control of the central processing unit;
the pulse eddy current bridge comprises a measuring bridge arm and a reference bridge arm, an eddy current excitation signal is loaded to the measuring bridge arm and the reference bridge arm to emit a space alternating magnetic field, electromagnetic excitation is carried out on a pipeline, and differential currents and differential voltages of the measuring bridge arm and the reference bridge arm are respectively detected by a differential current measuring circuit and a differential voltage measuring circuit; when the inner wall of the pipe wall has no defect, the pulse eddy current bridge reaches balance; when the inner wall of the pipe wall has defects, the central processing unit acquires and obtains differential current and differential voltage output by the differential current measuring circuit and the differential voltage measuring circuit;
and the central processing unit calculates to obtain differential conductance according to the collected differential current and differential voltage, and obtains the position information of the defect according to a data curve of the differential conductance.
Preferably, the device further comprises a data acquisition circuit, which is used for converting the differential current and the differential voltage into digital quantity and outputting the digital quantity to the central processing unit.
Preferably, the three-dimensional magnetic flux leakage detection unit comprises a plurality of three-axis hall sensors arranged in parallel in an array manner, and the number of the three-axis hall sensors is determined according to the width of the integrated probe and the width of each three-axis hall sensor.
Preferably, the pulsed eddy current bridges have at least one group, and all the pulsed eddy current bridges are arranged in tandem along the axial direction of the pipe.
Preferably, the measuring bridge arm comprises a measuring coil and a resistor connected in series with the measuring coil, and the eddy current excitation signal is loaded to the measuring coil and then emits the space alternating magnetic field; the reference bridge arm comprises a reference coil and a resistor connected with the reference coil in series, and the eddy current excitation signal is loaded to the reference coil and then emits the space alternating magnetic field.
The invention also provides a pipeline magnetic leakage internal detection method adopting the integrated probe, which is characterized in that the structure and position information of the defects of the pipeline are obtained by combining a three-dimensional magnetic leakage signal and a pulse eddy current signal to finish nondestructive detection, and the method comprises the following steps:
step 1: three-dimensional quantitative measurement of defects
The N integrated probes are uniformly arranged along the circumferential direction of the pipeline to be detected, and when the N integrated probes slide in the pipeline along the axial direction, the three-dimensional magnetic flux leakage detection unit continuously performs radial, axial and circumferential three-dimensional magnetic flux leakage quantitative measurement on the pipe wall of the pipeline to obtain size information of the length, width and height of the defect;
step 2: the pulsed eddy current excitation circuit loads the output eddy current excitation signal to a measurement bridge arm and a reference bridge arm, and the measurement bridge arm and the reference bridge arm emit a spatial alternating magnetic field to electromagnetically excite the pipeline;
and step 3: eddy current bridge arm electrical signal measurement
If the pipeline through which the integrated probe passes has no inner wall defect, the pulse eddy current bridge is balanced; if the inner wall of the pipeline through which the integrated probe passes has defects, the central processing unit acquires the formed differential voltage and differential current through the differential current measuring circuit and the differential voltage measuring circuit;
and 4, step 4: differential conductance calculation
The central processing unit calculates to obtain differential conductance according to the measured differential voltage and differential current;
and 5: the central processing unit forms a differential conductance waveform according to the calculated differential conductance, and when the integrated probe passes through the pipeline and has a defect on the inner wall, the measured differential conductance waveform has a waveform with a front positive peak value and a back negative peak value; when the inner wall of the pipeline has no defect, no peak signal is generated in the differential conductance waveform;
and 6: defect location determination
When the data curve of the radial component of the three-dimensional magnetic flux leakage signal has a waveform with a front negative peak value and a rear positive peak value, a defective signal can be judged; when a defect signal is measured by the three-dimensional magnetic flux leakage, combining the step 5, if the waveform of the differential conductance has a front positive peak value and a rear negative peak value, judging that the defect is positioned on the inner wall of the pipeline; when a defect signal is measured by the three-dimensional magnetic flux leakage, and the differential conductance waveform has no peak value waveform, the defect is positioned on the outer wall of the pipeline.
Preferably, the eddy current excitation signal is a rectangular PWM wave having a duty ratio of 50%.
The invention provides a magnetic flux leakage internal detection integrated probe and a detection method. The probe adopts the principle of pulse eddy current, designs a novel signal acquisition circuit and a novel detection method, and solves the problems that the conventional pulse eddy current probe can only detect defects and cannot judge whether the defects are positioned on the inner wall or the outer wall. Meanwhile, the probe integrates a three-dimensional magnetic flux leakage sensor, and can quantitatively measure the defects to obtain the structural information of the defects.
The magnetic leakage and eddy current integrated probe solves the problems that the conventional magnetic leakage detector adopts two probes, so that the detector cost is increased, the elbow trafficability and the deformation adaptability are poor, and the blockage is easy to occur. The method provided by the invention has the advantages of high response speed, high sensitivity, low power consumption and accurate inner and outer wall defect distinguishing, and can be applied and popularized in engineering.
Drawings
FIG. 1 is a schematic view of the placement of an integrated probe in a pipeline;
FIG. 2 is a schematic diagram of the positions of an integrated probe three-dimensional magnetic flux leakage detection unit and a pulsed eddy current detection unit;
FIG. 3 is a schematic diagram of eddy current bridge measurement;
FIG. 4 is a diagram of an eddy current bridge circuit;
FIG. 5 is a pulsed eddy current excitation circuit;
FIG. 6 is a REF generation circuit;
FIG. 7 is an eddy current coil current measurement circuit;
FIG. 8 is an eddy current bridge differential voltage measurement circuit;
FIG. 9 is an analog-to-digital conversion circuit;
FIG. 10 is an eddy current bridge signal waveform sampling timing sequence;
FIG. 11 is an eddy current bridge signal acquisition process;
FIG. 12 is a method of discriminating between inner and outer walls of a pipe defect.
Detailed Description
The invention is further elucidated with reference to the drawing. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The layout of the integrated probe for detecting the leakage flux of the pipeline based on the pulsed eddy current in the embodiment is shown in fig. 1, wherein 1-1 is the pipeline, and 1-2 is a series of integrated probes provided by the invention and arranged along the circumferential direction of the pipeline. 1-3 are Hall sensors inside the integrated probe, and the Hall sensors are placed along the circumferential direction of the pipeline 1-1. 1-4 is an eddy current measuring coil inside the integrated probe, 1-5 is an eddy current reference coil inside the integrated probe, and the eddy current measuring coil 1-4 and the eddy current reference coil 1-5 are axially arranged along the pipeline 1-1.
In this embodiment, the integrated probe provided by the invention includes a three-dimensional magnetic flux leakage detection unit and a pulsed eddy current detection unit, and the positions of the three-dimensional magnetic flux leakage detection unit and the pulsed eddy current detection unit are schematically shown in fig. 2. The three-dimensional magnetic leakage detection unit consists of 5 three-axis Hall sensors H1, H2, H3, H4 and H5 which are arranged along the circumferential direction of the pipeline, and the circumferential center distance of every two of the 5 three-axis Hall sensors H1, H2, H3, H4 and H5 is 5mm, so that the three-dimensional magnetic leakage detection unit is used for measuring the magnetic leakage strength of the defect in the X-Y-Z three directions. The number of the three-axis Hall sensors is determined according to the width of the three-axis Hall sensors and the total width of the integrated probe provided by the invention, so that the three-axis Hall sensors can be conveniently installed. The three-axis Hall sensors H1, H2, H3, H4 and H5 in the embodiment have 16-bit magnetic field resolution, can detect the magnetic field strength of 1050mT, and have the advantages of small size, low power consumption and the like. The pulse eddy current detection unit is arranged behind the three-dimensional magnetic flux leakage detection unit and comprises two groups of eddy current detection bridges. Each set of eddy current sensing bridges includes a measurement coil and a reference coil. The measuring coil and the reference coil are eddy current coils which are formed by winding enamelled wires with 50 turns, the inner diameter of 6.2mm and the wire diameter of 0.1 mm. The circumferential center distance of the eddy current coil is 21mm, and the axial center distance is 23.5mm. The front eddy current coil and the rear eddy current coil on the pulse eddy current detection unit are respectively a measuring coil and a reference coil to form a group of eddy current detection bridges, namely, a first series resistor of the eddy current measuring coil MEA1 and a second series resistor of the eddy current reference coil REF1 form a group of eddy current bridges, and a third series resistor of the eddy current measuring coil MEA2 and a fourth series resistor of the eddy current reference coil REF2 form another group of eddy current bridges.
The two sets of eddy current tests use the same test principle. One set of measurement principles for eddy current testing is shown in fig. 3. When the pipeline has no inner wall defect, the eddy current detection bridge is balanced by resistors R1 and R2 which are connected in series on the measurement bridge arm and the reference bridge arm. When the eddy current detection bridge touches a pipeline with inner wall defects such as corrosion, cracks and the like, the bridge arm of the eddy current detection bridge can be in contact with the pipeline due to the fact that the time for the measurement coil MEA1 and the time for the reference coil REF1 to get in and out of the defects are differentCausing a voltage difference. The differential voltage measurement circuit collects the differential voltage V between the measurement coil and the reference coil through a designed differential operational amplification circuit DIFF1 ＝V 1 -V 2 . Meanwhile, the existence of defects can lead to the inconsistency of the currents in the measuring coil and the reference coil, and differential current is formed. The differential current measuring circuit converts bridge arm currents on the measuring coil and the reference coil into a voltage U through transimpedance amplification I1 And U I2 The central processing unit (in this embodiment, the central processing unit uses CPLD) mathematically operates the two voltages U I1 And U I2 Converted into a differential current I between the measuring and reference bridge arms DIFF1 . The differential conductance C = I of the eddy current bridge can be obtained by dividing the differential voltage by the differential current DIFF1 /U DIFF1 . According to the waveform of the differential conductance, whether the defect is positioned on the inner wall or the outer wall of the pipeline can be obtained.
Fig. 4 is a circuit configuration diagram of any one set of eddy current detecting bridges. The device consists of a pulse eddy current excitation circuit, a measuring coil, a reference coil, a measuring coil current sampling circuit, a reference coil current sampling circuit, an eddy current bridge arm differential voltage sampling circuit, an analog/digital conversion circuit and a CPLD. The output of the eddy current bridge arm differential voltage sampling circuit is the voltage difference between the measuring coil and the reference coil.
FIG. 5 is a pulsed eddy current excitation circuit. In the figure, PWMA drives an analog switch by a square wave signal with 33k frequency and symmetric positive and negative under the control of the CPLD. The output of the analog switch is processed by an operational amplifier following circuit to enhance the driving capability of the eddy current excitation signal MOA, and the eddy current excitation signal MOA is a voltage signal of 1.65 +/-1.5V. R3=5.1k, R4=5.1k, R5=24k, R6=27k.
When PWMA = 1:
when PWMA = 0:
as shown in fig. 6, the +3.3VA divides the voltage through two equivalent resistors, and the voltage follower circuit is used to improve the driving capability of the signal, wherein VREF = +1.65V.
FIG. 7 is an eddy current measurement coil current measurement circuit. Current through the eddy current measuring coil I 1 Trans-impedance amplification into voltage signal V I1 Magnification factor of R g . The current I of the coil is measured 1 Is I 1 ＝V I1 /R g
Similarly, the current I of the eddy current reference coil 2 Is converted into V through transimpedance amplification I2 . Then the differential current I DIFF1 ＝I 1 -I 2 。
FIG. 8 is a differential voltage measurement circuit. The circuit comprises two operational amplifiers which form a differential amplification circuit. The voltages of the measuring coil and the reference coil are respectively sent to the in-phase input end of the operational amplifier to generate a bridge arm differential voltage V DIFF1 。V DIFF1 ＝V 1 -V 2 。
Fig. 9 is an analog/digital conversion circuit. The signal acquisition circuit adopts a 16-bit SAR type ADC in consideration of the conversion speed of the signal. The power supply voltage of the ADC is +3.3V, the reference is set to be +2.5V, and a single-end connection method is adopted.
Fig. 10 is a sampling timing chart of a bit signal waveform. An eddy current excitation signal MOA of 30us period is applied to the eddy current coil (the frequency of the signal will vary with the speed at which the inner detector is travelling). The cycle is divided into three parts:
a first part: a positive half cycle measuring period, from the 5us of the period, the data acquisition circuit ADC will read the differential voltage value V in turn DIFF1 Eddy current measuring bridge arm current I 1 Corresponding voltage V I1 And eddy current reference bridge arm current I 2 Corresponding voltage VI 2 。
A second part: a negative half-axis measurement cycle, from which cycle the data acquisition circuit ADC reads the differential voltage V DIFF1 Eddy current measuring bridge arm current I 1 Corresponding voltage V I1 And vortex parameterTest bridge arm current I 2 Corresponding voltage V I2 。
And a third part: calculating the period, from the 10 th us of the positive half cycle and the negative half cycle of the eddy current excitation, the central processing unit CPLD calculates the differential current of the eddy current bridge arm to obtain I DIFF1 ＝I 1 -I 2 And calculating the conductance value of the defect according to the measured differential voltage and differential current
The purpose of adopting two sets of eddy current testing bridges to be placed in parallel is to increase the coverage of defects, and the specific implementation is as follows: when two sets of eddy current bridges have signals with front positive peaks and back negative peaks, two situations may occur, the first is that the two sets of eddy current bridges detect the large defect of the same inner wall, and the second is that the two sets of eddy current bridges detect two or more adjacent inner wall defects. Specifically, the judgment needs to be finished by waiting for the internal detection, namely, after the probe provided by the invention scans the whole pipeline in the axial direction and off-line derives data, the first type or the second type is judged according to an inversion algorithm. If the first group of the two groups of eddy current bridges has a signal with a positive front peak value and a negative back peak value, and the second group of the two groups of eddy current bridges has no peak value signal, the first group can be judged to be an inner wall defect, and the second group needs to be combined with a leakage magnetic signal to judge whether the outer wall defect or the outer wall defect exists.
Fig. 11 is a signal acquisition process of the invention. After the program starts, the central processing unit always acquires three-dimensional magnetic flux leakage data and starts eddy current excitation. Differential conductance is obtained by collecting differential voltage and differential current at the measurement coil and the reference coil. And then, the program judges the magnetic leakage signal, and when the magnetic leakage signal is judged to have a peak value signal, whether the defect is on the inner wall or the outer wall is obtained according to the peak value information of the differential conductance. And when the leakage flux is judged to have no signal, ending the program and entering the next cycle.
Fig. 12 shows a method for detecting leakage flux inside a pipe based on a pulsed eddy current. When the probe passes through the defects of the inner wall of the pipeline, the waveform of the positive peak value and the negative peak value is generated on the differential conductance of the pulse eddy current detection unit, and the waveform of the negative peak value and the positive peak value is generated on the radial component of the three-axis Hall sensor of the three-dimensional magnetic flux leakage detection unit. When the probe passes through the defects of the outer wall of the pipeline, the pulse eddy current conductance does not have the waveform of a peak value, and the radial component of the three-axis Hall sensor has the waveform of a negative peak value firstly and then a positive peak value. Therefore, the position of the defect can be distinguished by combining the three-dimensional magnetic leakage signal with the pulse eddy current signal, namely the position of the defect on the inner wall or the outer wall of the pipeline. And the three-dimensional magnetic leakage detection unit can measure the magnetic leakage components of X, Y and Z and carry out quantitative analysis on the structure of the defect.
Claims (7)
1. An integrated probe for detecting leakage flux of a pipeline based on pulse eddy current, wherein N integrated probes are uniformly arranged along the circumferential direction of the pipeline to be detected, and is characterized in that each integrated probe comprises a pulse eddy current detection unit and a three-dimensional leakage flux detection unit,
the three-dimensional magnetic flux leakage detection unit is used for carrying out three-dimensional magnetic flux leakage measurement on the radial direction, the axial direction and the circumferential direction of the defect of the pipeline to obtain the structural information of the defect; when the integrated probe passes through the defects of the outer wall of the pipeline, the radial component of the three-dimensional magnetic flux leakage detection unit has a waveform generation of a negative peak value and a positive peak value;
the pulse eddy current detection unit is used for measuring whether the defect of the pipeline is positioned on the inner wall or the outer wall of the pipeline to obtain the position information of the defect, and comprises a pulse eddy current excitation circuit, a pulse eddy current bridge, a differential current measurement circuit, a differential voltage measurement circuit and a central processing unit, wherein:
the pulse eddy current excitation circuit is used for generating an eddy current excitation signal under the control of the central processing unit;
the pulse eddy current bridge comprises a measuring bridge arm and a reference bridge arm, an eddy current excitation signal is loaded to the measuring bridge arm and the reference bridge arm to emit a space alternating magnetic field, electromagnetic excitation is carried out on a pipeline, and differential currents and differential voltages of the measuring bridge arm and the reference bridge arm are respectively detected by a differential current measuring circuit and a differential voltage measuring circuit; when the inner wall of the pipe wall has no defect, the pulse eddy current bridge reaches balance; when the inner wall of the pipe wall has defects, the central processing unit acquires and obtains differential current and differential voltage output by the differential current measuring circuit and the differential voltage measuring circuit;
and the central processing unit calculates to obtain differential conductance according to the acquired differential current and differential voltage, and obtains the position information of the defect according to a data curve of the differential conductance.
2. The integrated probe for the internal detection of the pipeline magnetic leakage based on the pulsed eddy current as claimed in claim 1, further comprising a data acquisition circuit for converting the differential current and the differential voltage into digital values and outputting the digital values to the central processing unit.
3. The integrated probe for detecting pipeline leakage magnetic inner detection based on pulsed eddy current as claimed in claim 1, wherein the three-dimensional leakage magnetic detection unit comprises a plurality of three-axis hall sensors arranged in parallel array, and the number of the three-axis hall sensors is determined according to the width of the integrated probe and the width of each three-axis hall sensor.
4. The integrated probe for the internal inspection of the pipeline leakage flux based on the pulsed eddy current as claimed in claim 1, wherein there is at least one group of the pulsed eddy current bridges, and all the pulsed eddy current bridges are arranged in tandem along the axial direction of the pipeline.
5. The integrated probe for the internal detection of the pipeline magnetic leakage based on the pulsed eddy current as claimed in claim 4, wherein the measuring bridge arm comprises a measuring coil and a resistor connected in series with the measuring coil, and the eddy current excitation signal is loaded to the measuring coil and then emits the space alternating magnetic field; the reference bridge arm comprises a reference coil and a resistor connected with the reference coil in series, and the eddy current excitation signal is loaded to the reference coil and then emits the space alternating magnetic field.
6. A method for detecting leakage flux of a pipeline by using the integrated probe of claim 1, wherein the structure and position information of the defect of the pipeline are obtained by combining a three-dimensional leakage flux signal and a pulse eddy current signal, so as to complete nondestructive detection, comprising the following steps:
step 1: three-dimensional quantitative measurement of defects
The N integrated probes as claimed in claim 1 are uniformly arranged along the circumferential direction of the pipeline to be detected, and when the N integrated probes slide in the pipeline along the axial direction, the three-dimensional magnetic flux leakage detection unit continuously performs radial, axial and circumferential three-dimensional magnetic flux leakage quantitative measurement on the pipe wall of the pipeline to obtain size information of the length, width and height of the defect;
step 2: the pulsed eddy current excitation circuit loads the output eddy current excitation signal to a measurement bridge arm and a reference bridge arm, and the measurement bridge arm and the reference bridge arm emit a spatial alternating magnetic field to electromagnetically excite the pipeline;
and step 3: eddy current bridge arm electrical signal measurement
If the pipeline through which the integrated probe passes has no inner wall defect, the pulse eddy current bridge reaches balance; if the inner wall of the pipeline through which the integrated probe passes has inner wall defects, the central processor acquires differential voltage and differential current through the differential current measuring circuit and the differential voltage measuring circuit;
and 4, step 4: differential conductance calculation
The central processing unit calculates to obtain differential conductance according to the measured differential voltage and differential current;
and 5: the central processing unit forms a differential conductance waveform according to the calculated differential conductance, and when the integrated probe passes through the pipeline and has a defect on the inner wall, the measured differential conductance waveform has a waveform with a front positive peak value and a back negative peak value; when the inner wall of the pipeline is not defective, the differential conductance waveform does not generate a peak signal;
step 6: defect location determination
When the data curve of the radial component of the three-dimensional magnetic flux leakage signal has a waveform with a front negative peak value and a rear positive peak value, a defective signal can be judged; when a defect signal is measured, combining step 5, if the waveform of the differential conductance has a waveform with a front positive peak value and a back negative peak value, judging that the defect is positioned on the inner wall of the pipeline; when a defect signal is measured and the differential conductance waveform has no peak waveform, the defect is located on the outer wall of the pipe.
7. The pulsed eddy current-based pipeline leakage magnetic internal detection method according to claim 6, wherein the eddy current excitation signal is a rectangular PWM wave with a duty ratio of 50%.
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| CN110793429A (en) * | 2019-11-27 | 2020-02-14 | 中国特种设备检测研究院 | Integrated composite probe for detecting deformation of pipeline |
| CN111337567B (en) * | 2020-03-27 | 2023-10-03 | 南京航空航天大学 | Defect type assessment method based on eddy current and magnetic flux leakage detection signal fusion |
| 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 |
| CN113483650B (en) * | 2021-06-26 | 2023-06-16 | 山东航天电子技术研究所 | Eddy current sensor measuring method |
| 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 |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0619487A2 (en) * | 1993-04-06 | 1994-10-12 | Magnetic Analysis Corporation | System and method for non-desturctive plate examination |
| US5418459A (en) * | 1993-10-08 | 1995-05-23 | Magnetic Analysis Corporation | Method and apparatus for flaw detection using an AC saturating field generated by a first coil and an eddy current sensor second coil |
| CN104297338A (en) * | 2014-10-31 | 2015-01-21 | 江南大学 | Pulse eddy current detecting system based on rectangular difference probe |
| CN104865311A (en) * | 2015-05-04 | 2015-08-26 | 华中科技大学 | Pulsed eddy current probe, testing device and testing method of testing device |
| CN207423884U (en) * | 2017-11-20 | 2018-05-29 | 中国石油化工股份有限公司 | Multichannel geomagnetism detector based on magnetic force chromatographic technique |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101169225B (en) * | 2007-11-23 | 2010-12-22 | 上海核工程研究设计院 | Long conveyance pipe defect positioning method and positioning system |
| CN102192953A (en) * | 2010-08-30 | 2011-09-21 | 中机生产力促进中心 | Low-power consumption intelligent three-dimensional magnetic leakage detecting probe |
| CN102182933B (en) * | 2011-03-22 | 2012-10-31 | 江南大学 | Nondestructive detection system and method for pulsed magnetic flux leakage defects and stresses |
| CN107388048B (en) * | 2017-08-25 | 2023-10-20 | 上海市特种设备监督检验技术研究院 | Sensor for distinguishing defects of inner wall and outer wall of pipeline magnetic leakage inner detection and identification evaluation method |
-
2019
- 2019-05-15 CN CN201910401319.8A patent/CN110108788B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0619487A2 (en) * | 1993-04-06 | 1994-10-12 | Magnetic Analysis Corporation | System and method for non-desturctive plate examination |
| US5418459A (en) * | 1993-10-08 | 1995-05-23 | Magnetic Analysis Corporation | Method and apparatus for flaw detection using an AC saturating field generated by a first coil and an eddy current sensor second coil |
| CN104297338A (en) * | 2014-10-31 | 2015-01-21 | 江南大学 | Pulse eddy current detecting system based on rectangular difference probe |
| CN104865311A (en) * | 2015-05-04 | 2015-08-26 | 华中科技大学 | Pulsed eddy current probe, testing device and testing method of testing device |
| CN207423884U (en) * | 2017-11-20 | 2018-05-29 | 中国石油化工股份有限公司 | Multichannel geomagnetism detector based on magnetic force chromatographic technique |
Non-Patent Citations (3)
| Title |
|---|
| 丁凯,任德志,贾社民.漏磁及电涡流检测技术在生产控制中的应用研究.矿山机械.2003,(第06期),全文. * |
| 刘美全 ; 徐章遂 ; 米东 ; .基于磁阻效应的镀层工件漏磁检测传感系统设计.探测与控制学报.2006,(第03期),全文. * |
| 高玄怡 ; 曹新愿 ; 张卫民 ; 张瑞蕾 ; 邱忠超 ; .基于磁性方法的集成无损检测装置研究.仪表技术与传感器.2017,(第05期),全文. * |
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