CN113702488A - Coaxial circular rectangular double-coil eddy current probe - Google Patents
Coaxial circular rectangular double-coil eddy current probe Download PDFInfo
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- CN113702488A CN113702488A CN202111056334.7A CN202111056334A CN113702488A CN 113702488 A CN113702488 A CN 113702488A CN 202111056334 A CN202111056334 A CN 202111056334A CN 113702488 A CN113702488 A CN 113702488A
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- 239000000523 sample Substances 0.000 title claims abstract description 36
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 9
- 230000010363 phase shift Effects 0.000 abstract 2
- 238000000605 extraction Methods 0.000 abstract 1
- 230000009466 transformation Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 16
- 230000035945 sensitivity Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 7
- 230000006698 induction Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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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
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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
- G01N27/9006—Details, e.g. in the structure or functioning of sensors
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
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Abstract
The invention provides a coaxial circular rectangular double-coil eddy current probe which comprises: an ultrasonic stress measurement system comprising: the ultrasonic signal transmitting device comprises an ultrasonic signal transmitting device, an oscilloscope, an ultrasonic transducer probe and a standard part; one end of an ultrasonic transducer probe is respectively connected with a CH1 port of an oscilloscope, the other end of the ultrasonic transducer probe is connected with a CH2 port of the oscilloscope, the ultrasonic transducer probe is placed on a standard component, after an acoustic elastic constant of a structural component needing stress measurement is measured, Hilbert transformation of a discrete time domain signal is carried out on the signal, a signal frequency domain phase is calculated after wave packet extraction is carried out, and therefore a phase shift value caused by stress of the signal is obtained, and the phase shift value is substituted into an acoustic elastic equation to obtain a stress value with a more accurate measured surface.
Description
Technical Field
The invention belongs to the field of eddy current detection, and particularly relates to a coaxial circular rectangular double-coil eddy current probe.
Background
The eddy current sensor is a traditional non-contact type measuring and sensing device, has excellent characteristics of nondestructive testing, high sensitivity, high response speed, strong anti-interference capability and the like, and is widely applied to displacement measurement, defect detection and device operation state monitoring in various fields such as industrial production and the like.
However, the current eddy current sensor is limited by technical bottlenecks such as optimization of coil structural parameters, innovative design of a detection circuit, dynamic compensation of measurement errors and the like, and has the prominent limitations of poor sensitivity, poor linearity, poor temperature interference resistance and the like, so that the current eddy current sensor is directly limited to popularization and application in the high-precision detection field in various extreme environments.
The invention relates to a double-coil eddy current sensor, which is disclosed in patent CN202010303120.4 of Zhao Zhijian in 2020, and the method adopts double eddy current coils, realizes the transmission of eddy current signals by interconnecting upper and lower through holes, and utilizes a shielding layer to integrate a chip, thereby preventing the crosstalk of the chip, but the method has complex structure and greatly increases the cost;
the invention discloses a micro eddy current sensor based on double coils in patent CN201610034095.8 of Zhai Yao, 2016, the invention provides a micro eddy current sensor based on double coils, which comprises: electrode, exciting coil, induction coil, polyimide, through-hole, glass substrate and connecting wire, wherein: the induction coil is positioned right above the exciting coil; the through hole is positioned in the centers of the exciting coil and the induction coil and is used for respectively connecting the electrode and the exciting coil and the electrode and the induction coil; the polyimide is used for insulating and supporting the induction coil and the exciting coil, the glass substrate is located at the lowest part, and the connecting wire is used for connecting the through hole and the electrode. According to the sensor, the original first probe is detected by utilizing an eddy current, the lower working area is provided with the second coil mounting structure and the second detection window, the second detection window is provided with the second probe, and the industrial ceramic framework is arranged between the upper working area and the lower working area.
The single coil mainly comprises a rectangular column coil and a cylindrical coil, and the rectangular column coil has obvious gradient change of the axial magnetic field intensity, so that the impedance parameter of the rectangular column coil is particularly sensitive to the change of the lifting distance, the displacement sensitivity is high, and the single coil is relatively suitable for the field of displacement detection; the cylindrical coil is easy to excite the large-area eddy current effect in the measured medium due to the relatively large magnetic field intensity, and is particularly suitable for the field of defect detection. In the defect detection field, the cylindrical coil has obvious advantages due to the comprehensive performance of the magnetic field intensity, but the problem of poor precision generally exists in crack width detection because the magnetic field is mainly concentrated in a single axis direction.
In the displacement detection field, although the rectangular column coil has high displacement sensitivity, the rectangular column coil is limited by the magnetic field intensity, and the linear detection range of the rectangular column coil has certain limitation. For this reason, some researchers have tried to optimally arrange a plurality of cylindrical coils, and have proposed a spatial multi-coil structure, aiming to improve the displacement sensitivity and expand the linear range by using the high-intensity magnetic field characteristics of the cylindrical coils. In the defect detection field, the cylindrical coil has obvious advantages due to the comprehensive performance of the magnetic field intensity, but the problem of poor precision generally exists in crack width detection because the magnetic field is mainly concentrated in a single axis direction.
The coaxial double-cylinder coil has a certain inhibiting effect on magnetic cross-linking, and the magnetic field energy distribution is more concentrated, so that the sensitivity is relatively high, and the coaxial double-cylinder coil is more widely applied due to the compact structure. However, although the simple double rectangular column coil or the double cylindrical coil can exert respective advantages, the respective disadvantages are also highlighted
Disclosure of Invention
In order to overcome the defects, the invention provides the coaxial circular rectangular double-coil eddy current probe, which can take the advantages of a rectangular cylindrical coil and a cylindrical coil into consideration, can weaken the respective defects, can be used for displacement detection and defect detection, and has the advantages of high sensitivity, wide linear range, high precision, strong inhibition effect on magnetic cross-links and the like.
The invention is realized by the following method:
a coaxial circular rectangular double-coil eddy current probe:
the probe comprises a rectangular coil, a cylindrical coil, a coil bracket, a protective shell, a probe bracket and an extension cable;
the rectangular coil and the cylindrical coil are coaxial, the rectangular coil is arranged in the cylindrical coil, and coil wiring is reserved on the rectangular coil and the cylindrical coil;
the rectangular coil and the cylindrical coil are arranged on the coil support;
the coil support is installed on the top end of the probe support, the protective shell is installed on the probe support, and the extension cable penetrates through the probe support and is connected with the rectangular coil and the cylindrical coil.
Furthermore, the probe receives a high-frequency oscillation signal sent by the front-end device, the change of the impedance of the double coils outputs a direct-current voltage which is in direct proportion to the distance, and the measurement of the displacement, the rotating speed, the eccentricity, the thickness and the like of a measured object is realized by measuring the eddy current.
The invention has the beneficial effects
(1) The double-coil eddy current probe with the coaxial rectangular column coil and the cylindrical coil is designed and can be applied to an eddy current sensor, the double-coil eddy current probe sends a high-frequency oscillation signal through the receiving pre-positioning device, and electromagnetic induction can be generated on an object to be measured according to the Lenz law. The change of the impedance of the double coils outputs a direct current voltage which is in direct proportion to the distance, so that the measurement of the displacement, the rotating speed, the eccentricity, the thickness and the like of a measured object can be realized through the measurement of the size of the eddy current.
(2) The invention adopts the double coils, which can enhance the signal receiving; meanwhile, the coaxial design is adopted, so that the inhibition effect on magnetic cross-linking is strong; the double-coil rectangular cylinder coil and the double-coil cylindrical coil can well take the advantages of the rectangular cylinder coil and the cylindrical coil into consideration, and have the characteristics of high sensitivity, large linear range and high precision.
Drawings
FIG. 1 is a schematic drawing of a standard part according to the present invention;
FIG. 2 is a schematic diagram of the measurement of the acoustic elastic constant according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
With reference to fig. 1 to 2;
a coaxial circular rectangular double-coil eddy current probe:
the probe comprises a rectangular coil, a cylindrical coil, a coil bracket, a protective shell, a probe bracket and an extension cable;
the rectangular coil and the cylindrical coil are coaxial, the rectangular coil is arranged in the cylindrical coil, and coil wiring is reserved on the rectangular coil and the cylindrical coil;
the rectangular coil and the cylindrical coil are arranged on the coil support;
the coil support is installed on the top end of the probe support, the protective shell is installed on the probe support, and the extension cable penetrates through the probe support and is connected with the rectangular coil and the cylindrical coil.
The probe receives a high-frequency oscillation signal sent by the front-end device, and electromagnetic induction can be generated on an object to be detected according to the Lenz law. The change of the impedance of the double coils outputs a direct current voltage which is in direct proportion to the distance, and the measurement of the displacement, the rotating speed, the eccentricity, the thickness and the like of the measured object is realized by measuring the eddy current.
The coaxial circular rectangular double-coil eddy current probe provided by the invention is described in detail above, the principle and the implementation mode of the invention are explained, and the description of the above embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (2)
1. The utility model provides a circular double coil eddy current probe of rectangle with axle center which characterized in that:
the probe comprises a rectangular coil, a cylindrical coil, a coil bracket, a protective shell, a probe bracket and an extension cable;
the rectangular coil and the cylindrical coil are coaxial, the rectangular coil is arranged in the cylindrical coil, and coil wiring is reserved on the rectangular coil and the cylindrical coil;
the rectangular coil and the cylindrical coil are arranged on the coil support;
the coil support is installed on the top end of the probe support, the protective shell is installed on the probe support, and the extension cable penetrates through the probe support and is connected with the rectangular coil and the cylindrical coil.
2. The probe of claim 1, wherein:
the probe receives a high-frequency oscillation signal sent by the front-end device, the change of impedance of the double coils outputs a direct-current voltage which is in direct proportion to the distance, and the displacement, the rotating speed, the eccentricity, the thickness and the like of a measured object are measured by measuring the eddy current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111056334.7A CN113702488B (en) | 2021-09-09 | 2021-09-09 | Coaxial circular rectangular double-coil eddy current probe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111056334.7A CN113702488B (en) | 2021-09-09 | 2021-09-09 | Coaxial circular rectangular double-coil eddy current probe |
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| CN113702488A true CN113702488A (en) | 2021-11-26 |
| CN113702488B CN113702488B (en) | 2024-10-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076563A (en) * | 2021-12-13 | 2022-02-22 | 安徽见行科技有限公司 | Differential displacement sensor easy to realize high-precision installation and zero setting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114076563A (en) * | 2021-12-13 | 2022-02-22 | 安徽见行科技有限公司 | Differential displacement sensor easy to realize high-precision installation and zero setting method thereof |
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