CN105891323A - Eddy probe array for detecting pipeline deformation - Google Patents
Eddy probe array for detecting pipeline deformation Download PDFInfo
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- CN105891323A CN105891323A CN201410669996.5A CN201410669996A CN105891323A CN 105891323 A CN105891323 A CN 105891323A CN 201410669996 A CN201410669996 A CN 201410669996A CN 105891323 A CN105891323 A CN 105891323A
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Abstract
The invention discloses an eddy probe array for detecting pipeline deformation, and belongs to the technical field of pipeline non-destructive testing. An eddy distance measurement principle is applied to detection on large deformation of pipelines such as pipeline expansion and concaveness. A whole eddy distance measurement probe sensor comprises functional modules of an excitation circuit, a coil, a signal receiving and regulating module and a data acquisition and storage module. A detector with the array type eddy distance measurement probe is adopted to scan inside an oil-gas pipeline, the influence of an alternating magnetic field sensed by the probe on a pipeline wall to equivalent impedance of the excitation coil is converted into variation of voltage and current signals, by virtue of the variation of the electric signals, the variation of the vertical distance D of the eddy probe from the pipeline is measured, and thus geometrical parameters of pipeline expansion and concaves can be obtained. By adopting the eddy probe array, non-contact type continuous measurement on damage such as pipeline expansion and concaveness can be achieved, circumferential full-coverage detection of the probe can be achieved, and the eddy probe array has the characteristics that relatively large expansion can be measured, the sensitivity is high, the frequency response is wide, detection omission can be prevented to the maximum extent, and the like.
Description
Technical field
The invention belongs to pipeline non-destructive testing technical field, relate to a kind of eddy current range finding probe and detection method, be used for detecting oil and gas pipes and expand and depression.
Background technology
Pipeline non-destructive testing technology is to detect whether in-service long distance pipeline has the technology of the potential safety hazard such as deformation, burn into crackle.Oil and gas pipes is detected as seriation process, and point multiple stages are carried out.First pipeline cleaning equipment is thrown in, then throw in deformation detection equipment, detection pipe deforming size, deformation position, identify pipeline feature simultaneously, such as weld seam (spiral weld, girth joint, straight weld), threeway, valve, elbow, trend, to differentiate that subsequent corrosion detects the handling capacity of equipment with crackle etc., it it is the key link carrying out subsequent detection work.Deformation detection probe is mounted on mechanical carrier by Deformation inspection device, utilizes the displacement signal that probe produces when contacting with tube wall deformation position to differentiate deflection size record position.Common variation detection probe majority is contact probe, and expansion large-scale for pipeline cannot detect.Eddy current range finding probe is a kind of non-contacting linearisation metering outfit, based on electromagnetic induction principle, high linearity, high resolution ground can measure and quantify the tested pipeline distance away from detecting head surface, thus realizing the detection of the large deformation such as pipe expansion and depression.
According to faraday electromagnetic induction principle, reguline metal conductor is placed in the magnetic field of change or when making cutting magnetic line movement in magnetic field, and conductor is interior is Vorticose faradic current by generation, and this electric current is current vortex, and above phenomenon is referred to as eddy current effect.Alternating current in excitation coil creates action of alternating magnetic field in metal conductor measured, when tested metallic object is near this magnetic field, faradic current is produced in metal surface, meanwhile this current vortex produces the alternating magnetic field that a direction is in opposite direction with excitation coil, due to its retroaction, the amplitude and the phase place that make excitation coil high frequency electric are changed, i.e. the change of the equiva lent impedance of coil.Coil virtual impedance can use Z=F (б, ξ, τ, D, I, ω) function represents, б be the electrical conductivity of metallic conductor, ξ be pcrmeability, τ be that to be excitation coil with the distance on metallic conductor surface, I be current intensity and ω is frequency, if controlling τ, ξ for size factor, D, б, these parameters of I, ω keep constant, then the characteristic impedance Z of coil just becomes the monotropic function of distance D, that is eddy current causes the change of excitation coil equiva lent impedance, utilizes this change can calculate the distance between coil and conductor.
Summary of the invention
Eddy current distance-finding method is applied in pipe expansion and depression detection by the present invention, it is provided that a kind of defect inspection method for large deformation pipeline, solves common variation detection contact swing arm probe detection range limited, it is impossible to measure a difficult problem for bigger expansion.
Eddy current range finding probe, during detection, is calculated by vortex flow on the change impact of coil equiva lent impedance and judges the deformation of pipeline.The magnetic field that the excitation coil of each eddy current probe produces is perpendicular to pipeline surfaces externally and internally, pops one's head in circumferential, axial arranged in detector mechanical carrier, it is achieved detection probe circumference all standing, it is to avoid missing inspection.
In the present invention, excitation coil carries on the detector, while running in the duct with detector, the current vortex gained alternating magnetic field direction that excitation coil produces in metallic conduit is in opposite direction with the raw magnetic gradient in excitation coil, the intensity of raw magnetic gradient can be weakened, the magnetic field intensity of superposition is set to φ, and coil equiva lent impedance is set to Z.If pipe diameter is normal, then φ and Z stablizes constant.If chance pipe expansion, coil increases with vertical dimension D of metallic conduit, and φ weakens；If meeting depression situation, then D reduces, and φ strengthens.
By the process of detector internal electron circuit, the change of the change of coil impedance Z, i.e. excitation coil Yu vertical dimension D of metallic conduit is changed into the change of voltage or electric current.Will vertical dimension D be judged by the amplitude of output signal, the isoparametric size of equivalence value.Eddy current range finding probe is exactly to realize the measurement to large deformation such as metallic conduit expansion and depressions according to this principle.
Whole eddy current range finding probe module includes the functional modules such as the reception of exiting signal generating circuit, coil, signal and conditioning, Data acquisition and storage.After the voltage of cell winding, current signal are processed, become digital signal by analog digital conversion and store.
The eddy current range finding probe advantage of oil and gas pipes detector involved in the present invention is pipe expansion, depression equivalent damage to be carried out contactless continuous measurement, additionally it is different from conventional deformation detector, also have and can measure the features such as bigger expansion, highly sensitive, frequency response width.
Accompanying drawing explanation
Fig. 1 is that the present invention detects oil and gas pipes expansion and the eddy current rangefinder detector structural representation of depression defect
Fig. 2 is the operation principle schematic diagram of eddy current of the present invention range finding probe detection pipe deforming
Fig. 3 is that the present invention pops one's head at oil and gas pipes internal scanning expansion and the schematic diagram of depression
Fig. 4 is the electrical block diagram of the eddy current range finding probe sensor of the present invention
Detailed description of the invention
The present invention carry out in the following ways eddy current range finding probe design and use:
During pipeline non-destructive testing, deformation detection technology is used for detecting the geometric properties of pipeline.The swing arm probe of deformation detector was popped one's head in for contact in the past, and its port number determines its detection quality.Eddy current distance measuring type deformation detection of the present invention probe is non-contact optical probe, and inner surface of pipeline does not exist any damage, and eddy current sensor coil is the compactest, magnetic circuit wide coverage, and false dismissal probability is the lowest.
In eddy current distance measuring sensor, topmost element is coil, and its shape and size are related to sensitivity and the measurement scope of eddy current range finding probe sensor.First determining the performance parameter of single eddy current range finding probe, with air core coil as model, determined the parameters such as the difference of the internal-and external diameter of coil, thickness and equivalent redius by finite element analysis, the parameter determination for detection coil provides theoretical foundation.
After determining parameter attribute, i.e. determine the concrete size of eddy current range finding probe.The deformation detector mechanical carrier designed by pipeline corresponding to different bores, select most suitable and optimized eddy current probe module, it is mounted on detector skeleton, require probe circumferential array, the arrangement mode that many group circumference probes are interlaced can be used, make probe detection range circumference coverage rate maximum, as shown in Figure 1, wherein Figure 1A is axial view, and Figure 1B is isometric view, is labeled as probe number.
Fig. 2 is that the present invention pops one's head in and utilizes the schematic diagram of electromagnetic field change-detection pipe deforming.In the present invention, the work process of eddy current range finding probe is: when the deformation detector 1 carrying eddy current range finding probe is run in pipeline 2, often group eddy current probe is because being connected with alternating current, an alternating magnetic field E1 can be produced, this alternating magnetic field induces alternation current vortex I1 on perpendicular duct wall, and produced another alternating magnetic field E2 of I1 reacts on probe excitation coil, i.e. E1 and E2 superposition.The direction of E2 is in opposite direction with E1, reduces the intensity of E1 to a certain extent, and the intensity Δ E after magnetic field superposition represents.When running in normal pipeline, Δ E is held essentially constant, and therefore probe coil Z value is basically unchanged, it was demonstrated that vertical dimension D between pipeline and probe is constant, and pipe diameter is normal.When eddy current probe is through pipe expansion or depressed area, increase or reduction due to vertical dimension D, Δ E also can be decreased or increased accordingly, now, the Z value of probe coil also changes, the change of Z value causes the change of oscillating voltage amplitude, and this changes into a numeral amount change with the oscillating voltage of distance change through signal processing, is finally completed this process of detection of vertical dimension D between pipeline and probe.
When pipeline expands, detector runs to time herein, probe increases with pipeline distance D1, the alternating magnetic field E2 that eddy current the produces reduction declines to raw magnetic gradient E1, magnetic field intensity after superposition increases, and oscillating voltage strengthens, and voltage, current amplitude through processing of circuit conversion can increase, the change of this voltage x current amplitude and the relation of vertical dimension D are done quantification treatment, the geometric parameter of pipe expansion can be obtained；The geometric parameter of canal depression in like manner can be obtained when detector runs to canal depression.As shown in Figure 3.
Exciting circuit in the eddy current range-measurement system structure of pipe deforming, signal are received and are controlled by arm processor with the functional module such as conditioning, Data acquisition and storage；For the energy consumption of the system of saving, the MOS full bridge switching circuit that is driven through of coil realizes, ARM be adjusted the parameters such as the switching frequency of full-bridge circuit；Coiler part uses the structure of LC parallel resonance to export bigger voltage, it is simple to follow-up measurement.Electronic system architecture is as shown in Figure 4.
Claims (5)
1. one kind is applied to the eddy current range finding linear transducer array that oil and gas pipes expands and depression detects, it is characterised in that: eddy current probe excitation line
Enclose the deformation that the impact of coil equiva lent impedance is calculated and judges pipeline by the vortex flow produced by sensing.
2. eddy current range finding linear transducer array as claimed in claim 1, the magnetic field that its excitation coil produces is perpendicular to pipeline surfaces externally and internally,
Probe circumferential array, arranged in rows are on detector mechanical carrier, it is achieved detection probe circumference all standing, it is to avoid missing inspection.
3. the Deformation inspection device eddy current range finding linear transducer array as described in claim 1 and claim 2, its excitation coil is mounted in
On detector, while running in the duct with detector, utilize the change of excitation coil equiva lent impedance, judge eddy current probe
With the size of the vertical dimension of metallic conduit, by signal processing, distance value is quantified, and then obtain the characteristic parameter of pipe deforming.
4. eddy current distance-finding method as claimed in claim 3, its implementation is: received and conditioning, number by detector internal signal
According to gathering and the process to signal such as the functional module such as storage, by the change of coil impedance Z, i.e. excitation coil and metallic conduit
The change of vertical dimension changes into the change of voltage or electric current, will vertical dimension be joined by the amplitude of output signal, virtual value etc.
The size of number judges.
5. exciting circuit in eddy current range-measurement system, signal receive and the function such as conditioning, Data acquisition and storage, pass through arm processor
It is controlled.For the energy consumption of the system of saving, the MOS full bridge switching circuit that is driven through of coil realizes, by ARM to full-bridge
The parameters such as the switching frequency of circuit are adjusted.Coiler part uses the structure of LC parallel resonance to export bigger voltage, it is simple to
Follow-up measurement.
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| CN201410669996.5A CN105891323A (en) | 2014-11-21 | 2014-11-21 | Eddy probe array for detecting pipeline deformation |
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| CN201410669996.5A CN105891323A (en) | 2014-11-21 | 2014-11-21 | Eddy probe array for detecting pipeline deformation |
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| CN107830797A (en) * | 2017-11-18 | 2018-03-23 | 中机生产力促进中心 | Wide range current vortex sensor for Deformation inspection and preparation method thereof |
| CN107869972A (en) * | 2017-12-21 | 2018-04-03 | 苏州临点三维科技有限公司 | Cylinder inboard wall planeness measuring apparatus |
| CN109506078A (en) * | 2018-12-21 | 2019-03-22 | 苏州经贸职业技术学院 | A kind of robot for the detection of PCCP pipeline steel wire fracture of wire |
| CN109521088A (en) * | 2018-12-28 | 2019-03-26 | 中国石油大学(华东) | A kind of multichannel Pulsed eddy current testing device and method detecting defect of pipeline |
| CN109791126A (en) * | 2016-10-06 | 2019-05-21 | 新东工业株式会社 | Surface characteristic inspection method and surface characteristic check device |
| CN111076029A (en) * | 2019-12-31 | 2020-04-28 | 中国人民解放军92578部队 | Internal detection device for micro pipeline corrosion eddy |
| CN112066869A (en) * | 2020-09-16 | 2020-12-11 | 上海信朴臻微电子有限公司 | Angular displacement sensing system and angular displacement analysis method |
| CN112114031A (en) * | 2020-10-14 | 2020-12-22 | 西安石油大学 | Detector for measuring metal defects of petroleum pipeline matrix |
| CN112129830A (en) * | 2020-09-02 | 2020-12-25 | 中国人民解放军空军工程大学航空机务士官学校 | Aircraft metal structure burn detection method based on eddy current conductivity |
| CN112394105A (en) * | 2019-08-12 | 2021-02-23 | 中国石油天然气股份有限公司 | Support arm of pipeline detector and pipeline detector |
| CN112505140A (en) * | 2020-12-15 | 2021-03-16 | 爱德森（厦门）电子有限公司 | Method and device for designing variable-diameter eddy current detection sensor |
| CN113340479A (en) * | 2021-05-18 | 2021-09-03 | 上海工程技术大学 | Three-dimensional force flexible touch sensor based on eddy current and piezoelectric principle coupling |
| CN113587798A (en) * | 2021-07-28 | 2021-11-02 | 深圳市华星光电半导体显示技术有限公司 | Height measuring device and height measuring method thereof, repairing equipment and repairing method thereof |
| CN113777155A (en) * | 2021-09-09 | 2021-12-10 | 国家石油天然气管网集团有限公司华南分公司 | Eddy current probe based on Halbach array coil |
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| CN114608437A (en) * | 2022-03-21 | 2022-06-10 | 天津大学 | Method for measuring bending angle of submarine pipeline |
| CN114720038A (en) * | 2022-04-26 | 2022-07-08 | 沈阳工业大学 | Spherical internal detection system for gas pipeline |
| CN114739279A (en) * | 2022-03-17 | 2022-07-12 | 昆明理工鼎擎科技股份有限公司 | Device and method for verifying dynamic test precision of eddy current displacement sensor |
| CN114754664A (en) * | 2022-03-17 | 2022-07-15 | 昆明理工大学 | Device and method for measuring dynamic deformation of cylinder sleeve by using eddy current sensor |
| WO2023015675A1 (en) * | 2021-06-29 | 2023-02-16 | 四川德源管道科技股份有限公司 | Pipeline nondestructive testing device |
| CN117347425A (en) * | 2023-12-06 | 2024-01-05 | 山东扬智汽车科技有限公司 | Deformation testing device for automobile parts |
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Application publication date: 20160824 |