CN111337569A - Novel pulse near-field and far-field combined eddy current sensor - Google Patents
Novel pulse near-field and far-field combined eddy current sensor Download PDFInfo
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- CN111337569A CN111337569A CN202010298675.4A CN202010298675A CN111337569A CN 111337569 A CN111337569 A CN 111337569A CN 202010298675 A CN202010298675 A CN 202010298675A CN 111337569 A CN111337569 A CN 111337569A
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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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- 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
- G01N27/9013—Arrangements for scanning
- G01N27/902—Arrangements for scanning by moving the sensors
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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
- G01N27/9046—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 by analysing electrical signals
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention belongs to the field of nondestructive detection of industrial pipelines in the basic chemical industry and the petroleum refining industry, and particularly relates to a novel pulse near-field and far-field combined eddy current sensor. The invention is composed of a six-core quick-connection self-locking plug, an exciting coil, two receiving coils (A/B), a supporting frame, a sliding device and a two-core flexible cable. Wherein, a receiving coil A and an exciting coil are coaxially coupled to realize pulse near-field eddy current; the second receiver coil B is slidable in parallel on the support frame so as to adjust the pitch distance, thus realizing a pulsed "far field eddy current" at a far position (far field position) of the exciter coil. The invention has better focusing and penetrating functions, can detect not only the pipelines or equipment with thicker coating layers and larger wall thickness, but also the pipelines or equipment with the coating layers of galvanized iron sheets (tinplate).
Description
Technical Field
The invention belongs to the field of nondestructive detection of industrial pipelines in the basic chemical industry and the petroleum refining industry, and particularly relates to a novel pulse near-field and far-field combined eddy current sensor.
Background
In the operation process of basic chemical industry and petroleum refining devices, monitoring the wall thickness reduction state of pipelines with high heavy corrosion risks is very necessary, and the traditional ultrasonic thickness gauge is generally adopted for fixed-point thickness measurement.
The existing pulse eddy current sensor (namely, a near-field eddy current part) can generally realize scanning of a certain wall thickness and achieve the purpose of quickly positioning the defect position. But the pipeline with thicker coating layer and thicker wall thickness is difficult to realize rapid penetration, and the defect can be positioned only by adopting means of reducing frequency and the like, so that the intention of rapidly positioning the defect position by the pulse eddy current cannot be met.
For pipelines or equipment with cladding layers, the pipelines or equipment with the cladding layers are rainproof and moistureproof, a protective layer needs to be arranged outside the cladding layers, the existing protective layer is generally made of an aluminum sheet, a stainless steel sheet or a galvanized iron sheet (tinplate), and different from the aluminum sheet and the stainless steel sheet, the galvanized iron sheet (tinplate) has high relative magnetic conductivity and can shield pulse eddy current detection signals, and the existing pulse eddy current sensor cannot detect the pipelines with the cladding layers, of which the protective layers are galvanized iron sheets (tinplates).
Disclosure of Invention
In order to overcome the defects, the invention provides a novel pulse near-field and far-field combined flow vortex sensor device.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a novel pulsed near-field, far-field combined eddy current sensor, comprising: exciting coil, receiving coil A, receiving coil B, connecting piece, support frame, slider, wherein:
the excitation coil is connected with the host, fixed at one end of the support frame and used for receiving pulse current;
the receiving coil A is wound outside the exciting coil and is coaxial with the exciting coil;
the sliding device is arranged on the support frame and can slide freely;
the receiving coil B and the sliding device are combined to form a sliding receiving coil B;
the exciting coil, the receiving coil A and the receiving coil B are all connected to the connecting piece and used for being connected with external equipment.
The receiving coil A and the exciting coil form a pulse near-field eddy current detection unit which is used for detecting a near-field eddy current area generated in the pipe wall to be detected.
The sliding receiving coil B and the exciting coil form a pulse far-field eddy current detection unit which is used for detecting a far-field eddy current area generated in the pipe wall to be detected.
The receiving coil A is as high as the exciting coil.
And the wire diameter of the receiving coil A and the receiving coil B is smaller than that of the exciting coil.
The sliding range of the sliding device is 50mm-1000mm away from the exciting coil.
The exciting coil receives a pulse signal transmitted by external equipment, so that a magnetic field attenuated instantaneously is generated in the exciting coil.
The pulse signal is an instant off current.
An impulse type instant attenuation magnetic field is excited by loading instant turn-off current in an excitation coil, so that attenuation eddy current is generated in the pipe wall to be detected; and the receiving coil A receives a secondary attenuated magnetic field in a near-field eddy current area in the pipe wall or the receiving coil B receives a secondary attenuated magnetic field in a far-field eddy current area in the pipe wall, and outputs a corresponding attenuated induction voltage signal for analyzing the condition of an abnormal area of the pipe wall.
The conditions of the abnormal area of the pipe wall comprise: metal loss due to corrosion, cracking, slag inclusions, stress concentration defects.
The invention has the following beneficial effects and advantages:
1. the invention can simultaneously realize the detection functions of the pulse near-field eddy current and the pulse far-field eddy current.
2. The device can detect the device with the coating thickness less than 150mm and the device or the steel pipeline with the wall thickness less than 40mm, and increases the detection precision on the basis of increasing the penetration capacity.
3. The invention has better focusing and penetrating functions, can detect not only the pipelines or equipment with thicker coating layers and larger wall thickness, but also the pipelines or equipment with the coating layers of galvanized iron sheets (tinplate).
Drawings
FIG. 1 is a block diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a novel pulsed near-field far-field combined flow vortex sensor device is invented. The combined flow vortex sensor device with the pulse near field and the far field is composed of a six-core quick-connection self-locking plug, an exciting coil, two receiving coils (A/B), a supporting frame, a sliding device and a two-core flexible cable.
The receiving coil A and the exciting coil are coaxial to form a pulse near-field eddy current detection system. Wherein, two lines of the exciting coil are connected to the six-core quick-connection self-locking plug, and two lines of the receiving coil are also connected to the six-core quick-connection self-locking plug.
The receiving coil B is outside the exciting coil and combined with the sliding device to form a sliding receiving coil B. The distance of the sliding receiving coil B can be adjusted through the supporting rod, and a pulse far-field eddy current detection system is formed (the distance of a far-field area is finely adjusted according to different pipe diameters).
The pulse far-field eddy current sensor device consists of an exciting coil, a receiving coil A, a receiving coil B, a supporting frame and a sliding device. Wherein the receiving coil A is coaxial with the exciting coil.
The receiving coil B is outside the exciting coil and combined with the sliding device to form a sliding receiving coil B. The distance of the sliding receiving coil B can be adjusted through the supporting rod, and a pulse far-field eddy current detection system is formed.
In the patent, the wire diameter of the exciting coil is 0.2mm-2mm, the number of turns of the exciting coil is 50-1500 turns, and the exciting coil is selected according to the thickness and the wall thickness of a coating layer.
The wire diameter of the receiving coil A is 0.1mm-1mm, the number of turns of the receiving coil A is 100 and 2000 turns, and the receiving coil A is selected according to the thickness and the wall thickness of the coating layer.
The wire diameter of the receiving coil B is 0.1mm-1mm, the number of turns of the receiving coil A is 100 and 2000 turns, and the receiving coil B is selected according to the thickness and the wall thickness of the coating layer.
The exciting coil is fixed on the supporting frame, and the supporting frame is insulated.
The sliding range of the sliding device is 50mm-1000 mm.
The invention can simultaneously realize the detection functions of the pulse near-field eddy current and the pulse far-field eddy current.
The device is connected with the pulse vortex main machine, and can realize the detection of the device with the coating thickness less than 150mm and the equipment or steel pipeline wall thickness less than 40mm through the pulse vortex wall thickness measurement algorithm software, and meanwhile, the detection precision is increased. The software for the pulse eddy current wall thickness measurement algorithm can obtain wall thickness values corresponding to different positions when the probe moves according to the slope of the late signal of the voltage curve corresponding to the secondary magnetic field of the receiving coil.
The invention can realize the thickness detection of the cladding layer pipeline or equipment with the protective layer of galvanized steel (tinplate).
The invention relates to a pulse near-field and far-field combined eddy current sensor, which is characterized in that: the detection of thick coating layer and pipeline or equipment with larger wall thickness can be realized, and the detection of high precision and high penetration capability can be carried out on the coating layer pipeline or equipment with a protective layer made of galvanized steel (iron sheet) by the device. Due to the combined sensor, the obtained comprehensive feedback signals of two areas (an eddy current attenuation near field area and an eddy current attenuation far field area) of the pipeline position covered by the magnetic field of the excitation probe are obtained, and the two comprehensive signals have wide information content and multiple meanings. Through algorithm analysis, data feedback of a near field region and data feedback of a far field region can be obtained.
According to the invention, a (pulse type) rapid attenuation magnetic field can be excited by loading (pulse type) instant turn-off current in the excitation coil, and the attenuation magnetic field can also generate attenuation eddy current in the pipe wall to be measured. The decaying eddy current in the pipe wall can generate a secondary decaying magnetic field, and the secondary decaying magnetic field can be received in the receiving coil to output a corresponding decaying induction voltage (signal).
If the pipeline is defective, the condition of attenuation eddy current on the loading pipeline is influenced, the secondary attenuation magnetic field is influenced, and the attenuation induction voltage on the receiving coil is influenced. The secondary attenuation magnetic field induces attenuation voltage in the receiving coil, and actually contains comprehensive information such as metal thickness. The specific position and severity of the defect can be obtained by algorithm analysis.
For the receive coil a, which is coaxial with the excitation coil, the near field eddy current region is received. The secondary attenuation magnetic field intensity of the region is stronger (namely, the eddy current density is higher), the sensitivity is higher, but the permeability is weaker; for the receive coil B, the corresponding second-order decaying magnetic field is the far-field eddy current region. The secondary attenuation magnetic field intensity of the region is weaker (namely, the eddy current density is lower), the sensitivity is lower, but the permeability is stronger, and the region can penetrate through the insulating layer with larger wall thickness and the wall thickness.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto. Any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention, and all the equivalents or changes thereof are covered within the protection scope of the present invention.
Claims (10)
1. A novel pulsed near-field far-field combined eddy current sensor is characterized by comprising: exciting coil, receiving coil A, receiving coil B, connecting piece, support frame, slider, wherein:
the excitation coil is connected with the host, fixed at one end of the support frame and used for receiving pulse current;
the receiving coil A is wound outside the exciting coil and is coaxial with the exciting coil;
the sliding device is arranged on the support frame and can slide freely;
the receiving coil B and the sliding device are combined to form a sliding receiving coil B;
the exciting coil, the receiving coil A and the receiving coil B are all connected to the connecting piece and used for being connected with external equipment.
2. The novel pulsed near-field far-field combined eddy current sensor according to claim 1, wherein the receiving coil a and the exciting coil form a pulsed near-field eddy current detection unit for detecting a near-field eddy current region generated in a pipe wall to be detected.
3. The novel pulsed near-field far-field combined eddy current sensor according to claim 1, wherein the sliding receiving coil B and the exciting coil form a pulsed far-field eddy current detection unit for detecting a far-field eddy current region generated in a pipe wall to be detected.
4. The novel pulsed near-field far-field combined eddy current sensor as claimed in claim 1, wherein the receiving coil a is as high as the exciting coil.
5. The novel pulsed near-field far-field combined eddy current sensor as claimed in claim 1, wherein the wire diameter of the receiving coil a and the receiving coil B is smaller than that of the exciting coil.
6. The novel pulsed near-field far-field combined eddy current sensor as claimed in claim 1, wherein the sliding means sliding range is 50mm-1000mm from the excitation coil.
7. The novel pulsed near-field far-field combined eddy current sensor as claimed in claim 1, wherein the exciting coil receives a pulse signal transmitted from an external device, so that a momentarily attenuated magnetic field is generated in the exciting coil.
8. The novel pulsed near-field far-field combined eddy current sensor as claimed in claim 7, wherein the pulsed signal is an instantaneous off current.
9. The novel pulsed near-field far-field combined eddy current sensor according to claim 1, wherein a pulsed instantaneous attenuated magnetic field is excited by loading an instantaneous turn-off current in an excitation coil, so that attenuated eddy currents are generated in the pipe wall to be measured; and the receiving coil A receives a secondary attenuated magnetic field in a near-field eddy current area in the pipe wall or the receiving coil B receives a secondary attenuated magnetic field in a far-field eddy current area in the pipe wall, and outputs a corresponding attenuated induction voltage signal for analyzing the condition of an abnormal area of the pipe wall.
10. A novel pulsed near-field, far-field combined eddy current sensor as claimed in claim 9, wherein the condition of abnormal area of the tube wall includes: metal loss due to corrosion, cracking, slag inclusions, stress concentration defects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010298675.4A CN111337569A (en) | 2020-04-16 | 2020-04-16 | Novel pulse near-field and far-field combined eddy current sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010298675.4A CN111337569A (en) | 2020-04-16 | 2020-04-16 | Novel pulse near-field and far-field combined eddy current sensor |
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| CN106290560A (en) * | 2016-08-18 | 2017-01-04 | 广西电网有限责任公司电力科学研究院 | A kind of electromagnetic detection coupling probe |
| CN106501355A (en) * | 2016-12-14 | 2017-03-15 | 中国计量大学 | A kind of metallic conduit defect detecting device based on far-field eddy |
| CN107505388A (en) * | 2017-07-25 | 2017-12-22 | 西安交通大学 | A kind of flexible magnetic saturation Pulsed eddy current testing probe and detection method |
| WO2018007640A2 (en) * | 2016-07-07 | 2018-01-11 | Heinrich Hirdes Gmbh | Method and system for electromagnetic detection and inspection of an area for metallic interference masses |
| CN109444270A (en) * | 2018-11-20 | 2019-03-08 | 四川沐迪圣科技有限公司 | A kind of electromagnetic acoustic and impulse eddy current compound detection sensor |
| CN209624482U (en) * | 2018-12-31 | 2019-11-12 | 长沙航空职业技术学院 | Pulse precursor in far field tandem differential probe |
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2020
- 2020-04-16 CN CN202010298675.4A patent/CN111337569A/en active Pending
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| US5461313A (en) * | 1993-06-21 | 1995-10-24 | Atlantic Richfield Company | Method of detecting cracks by measuring eddy current decay rate |
| US5623203A (en) * | 1994-08-01 | 1997-04-22 | Tokyo Gas Co., Ltd. | Remote field flaw sensor including an energizing coil, first and second receiving coil groups oriented perpendicular and a third receiving coil oriented parallel to pipe |
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| DE10127806A1 (en) * | 2001-06-07 | 2002-12-19 | Siemens Ag | Process for acquiring and/or monitoring material properties of electrically conducting material used in rolling mills comprises using electromagnetic eddy current technique with eddy current excitation and detection |
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