CN111982967A - Permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method - Google Patents
Permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method Download PDFInfo
- Publication number
- CN111982967A CN111982967A CN202010852766.8A CN202010852766A CN111982967A CN 111982967 A CN111982967 A CN 111982967A CN 202010852766 A CN202010852766 A CN 202010852766A CN 111982967 A CN111982967 A CN 111982967A
- Authority
- CN
- China
- Prior art keywords
- ferromagnetic material
- eddy current
- permanent magnet
- heating coil
- thermal infrared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 51
- 238000011156 evaluation Methods 0.000 title claims abstract description 13
- 239000003302 ferromagnetic material Substances 0.000 claims abstract description 95
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 230000007547 defect Effects 0.000 claims abstract description 41
- 230000005284 excitation Effects 0.000 claims abstract description 36
- 230000006698 induction Effects 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000009826 distribution Methods 0.000 claims description 23
- 230000035699 permeability Effects 0.000 claims description 11
- 230000035515 penetration Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 6
- 238000009659 non-destructive testing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
Abstract
A magnetic saturation pulse eddy current infrared nondestructive evaluation method based on a permanent magnet comprises the steps that a program controller is controlled through a computer to synchronously trigger an induction heater and a thermal infrared imager, the induction heater receives a trigger signal and applies a pulse current excitation to a heating coil connected with a heating head, and a cooling device cools the induction heater, the heating head and the heating coil at the same time; a strong static magnetic field is generated around the permanent magnet, the ferromagnetic material reaches magnetic saturation under the action of the permanent magnet, then joule heat is generated under the action of the heating coil, and the change of the surface temperature of the material is caused by heat conduction; and finally, acquiring the temperature change through a thermal infrared imager and performing defect nondestructive evaluation on the ferromagnetic material through analyzing the acquired image sequence. Compared with the traditional pulsed eddy current infrared nondestructive detection method, the method has larger detection depth for the ferromagnetic material and has wide application prospect.
Description
Technical Field
The invention relates to the field of ferromagnetic material defect pulse eddy current infrared nondestructive testing, in particular to a permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method.
Background
The ferromagnetic material is one of the main support materials in modern industrial and agricultural production, the product of the ferromagnetic material is an index representing the economic development degree of a country, and the demand of the ferromagnetic material can roughly reflect the national standard of living of a country. As a basic functional material, ferromagnetic materials are applied in various aspects of life, and at present, ferromagnetic materials are mainly applied in the aspects of telecommunications, motors, storage devices of televisions, computers, and the like. Ferromagnetic materials and various defects in workpieces are serious hidden dangers of modern industrial equipment, products and weapons, and therefore, in industrial production, the ferromagnetic materials must be strictly detected.
The pulse eddy current infrared is a novel nondestructive testing technology and has the advantages of non-contact, large observation range, high resolution and the like. The pulsed eddy current infrared nondestructive testing technology applies an alternating magnetic field to an object through high-frequency excitation current in an excitation coil, then an infrared thermal imager is used for collecting an image sequence of the surface temperature change of the object, and finally the nondestructive testing and nondestructive evaluation can be carried out on the object through analyzing the temperature image sequence.
Because the excitation frequency adopted by the pulse eddy current infrared is very high, and the relative magnetic permeability of the ferromagnetic material is very high, the penetration depth of an eddy current field is small, namely the depth of a joule heat source is very small in the process of detecting the ferromagnetic material by using the pulse eddy current infrared nondestructive detection method, so that the defect at a relatively deep position in the ferromagnetic material is difficult to detect. Fortunately, the ferromagnetic material can reach a magnetic saturation state in an external magnetic field with a certain intensity, namely the relative magnetic permeability is reduced, and the penetration depth of the eddy current field is increased, namely the depth of a joule heat source is increased. Therefore, from the mechanical analysis, the detection of ferromagnetic materials in a magnetically saturated state using the pulsed eddy current infrared nondestructive detection method will enable detection of defects at deeper positions.
Disclosure of Invention
In order to achieve the aim of detecting the defects of the ferromagnetic material by using the pulse eddy current infrared nondestructive testing method, the invention aims to provide a permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method, and an experimental device of the method consists of a computer, a program controller, an induction heater, a heating head, a heating coil, a cooling device, a permanent magnet and an infrared thermal imager; when the method is realized, firstly, the computer is used for controlling the program controller to synchronously trigger the induction heater and the thermal infrared imager, the induction heater receives a trigger signal and applies a pulse current excitation to a heating coil connected with a heating head, and the cooling device simultaneously cools the induction heater, the heating head and the heating coil; the ferromagnetic material can reach magnetic saturation under the action of the permanent magnet, then joule heat is generated under the action of the heating coil, and the change of the surface temperature of the material is caused by heat conduction; and finally, acquiring the temperature change through a thermal infrared imager and performing defect nondestructive evaluation on the ferromagnetic material through analyzing the acquired image sequence. Compared with the traditional pulsed eddy current infrared nondestructive detection method, the method has larger detection depth for the ferromagnetic material and has wide application prospect.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method is used for positioning and quantitatively evaluating defects in a ferromagnetic material and comprises the following steps:
step 1: building an experimental device, wherein the experimental device consists of a computer, a program controller, an induction heater, a cooling device, a heating head, a heating coil, a permanent magnet and a thermal infrared imager; the computer is used for controlling the program controller and receiving an image sequence collected by the thermal infrared imager, and the program controller synchronously triggers the induction heater and the thermal infrared imager; the induction heater applies pulse excitation current to a heating coil connected with the heating head after receiving the trigger signal, the heating coil and the permanent magnet are placed above the ferromagnetic material, and meanwhile, the cooling device cools the induction heater, the heating head and the heating coil; the thermal infrared imager starts to acquire an image sequence of the ferromagnetic material and transmits the image sequence to the computer after receiving a trigger signal from the program controller;
step 2: firstly, opening a cooling device, placing a permanent magnet and a heating coil above a ferromagnetic material, then carrying out temperature calibration on a thermal infrared imager, and carrying out focusing operation after the calibration is finished, so as to ensure that an image of the ferromagnetic material in the thermal infrared imager is clear, and simultaneously, the distance between the thermal infrared imager and the heating coil and the distance between the thermal infrared imager and the permanent magnet are both required to be larger than 500mm, so that the magnetic field generated by the heating coil and the magnetic field generated by the permanent magnet are prevented from influencing the performance of the thermal infrared imager;
and step 3: setting parameters of an excitation current applied to a heating coil by an induction heater in a program controller, including: current amplitude, excitation frequency and excitation time; then setting parameters of an infrared thermal imager for acquiring an image sequence in a program controller, wherein the parameters comprise: sampling frequency and total acquisition time; the total acquisition time must be greater than the excitation time;
and 4, step 4: the computer is used for controlling the program controller to simultaneously provide a trigger signal for the induction heater and the thermal infrared imager, the induction heater receives the trigger signal and simultaneously applies a pulse excitation current to the heating coil, and the expression of the excitation wave is shown as the formula (1); meanwhile, when the infrared thermal imager receives a trigger signal sent by the program controller, the change of the surface temperature of the ferromagnetic material is collected;
I(t)＝I0×(1-e-10000t)×sin(ωt) (1)
in the formula: i (t) represents the excitation current value at time t, I0Representing the amplitude of the pulse excitation current, omega is the angular frequency of the pulse excitation current, and t is time;
the pulse current in the heating coil can excite an alternating magnetic field in space, and the ferromagnetic material can generate eddy current in the alternating magnetic field; under the action of a constant magnetic field generated by the permanent magnet, the ferromagnetic material reaches a magnetic saturation state, and the magnetic conductivity of the ferromagnetic material is reduced, so that the penetration depth of eddy current in the ferromagnetic material is increased; according to joule's law, part of eddy current is converted from electric energy to heat energy in the material, and the generated joule heat Q is proportional to the eddy current density JsAnd electric field density E:
in the formula: σ represents the electrical conductivity of the ferromagnetic material; j. the design is a squaresRepresents the eddy current density; e represents the electric field intensity, and its expression is represented by formula (3);
in the formula: a represents a magnetic vector position, and can be obtained by formula (4); t represents time;
in the formula: μ represents the permeability of the ferromagnetic material;
joule heat Q generated by the eddy current will propagate inside the ferromagnetic material, the propagation law of which follows equation (5);
in the formula: ρ represents the density of the ferromagnetic material; cpRepresents the specific heat capacity of the ferromagnetic material; k represents the thermal conductivity of the ferromagnetic material; t represents a temperature; q represents Joule heat;
when defects exist on the surface or inside of the ferromagnetic material, the defects influence the distribution of an eddy current field (namely influence the distribution of a joule heat source) on one hand and influence the heat conduction process on the other hand, so that the temperature distribution on the surface of the ferromagnetic material is uneven, and the defects can be finally reflected in an image sequence acquired by a thermal infrared imager; under the action of a constant magnetic field generated by the permanent magnet, the relative magnetic permeability of the ferromagnetic material is reduced, the penetration of eddy current is increased, and the depth of heat conduction is larger, so that compared with the traditional pulsed eddy current infrared nondestructive detection method, the method disclosed by the invention has the advantage that the detection capability of the method for the defects in a deeper position is enhanced;
and 5: positioning and quantifying defects in the ferromagnetic material through an image sequence acquired by a thermal infrared imager; because the defects on the surface or inside of the ferromagnetic material can influence the heat conduction process, the temperature distribution near the defects and the temperature distribution without the defects have larger difference, and the defects in the ferromagnetic material can be positioned and quantified by analyzing the temperature distribution cloud images on the image sequence acquired by the thermal infrared imager.
Compared with the prior art, the invention has the following advantages:
1) compared with the traditional ferromagnetic material measuring method, the method has the advantages of non-contact, large observation range, high resolution, high detection speed and the like;
2) compared with the traditional pulse eddy current infrared nondestructive detection method, the method has the advantages of larger detection depth of the defects of the ferromagnetic material, simple and convenient construction of an experimental system, simple operation and wide application prospect.
Drawings
FIG. 1 is a schematic diagram showing the connection of the components of the permanent magnet based magnetic saturation pulse eddy current infrared nondestructive evaluation system.
Fig. 2 is a diagram illustrating the change of relative permeability of a ferromagnetic material with the intensity of a magnetic field.
Fig. 3(a) is a schematic plan view of disturbance of defects in a test piece of a measured ferromagnetic material on eddy current field distribution.
FIG. 3(b) is a schematic front view of disturbance of defects in a tested ferromagnetic material specimen on eddy current field distribution in the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
for the ferromagnetic material piece to be tested shown in fig. 1, the detection steps of the method of the present invention are: the experimental device adopted by the method shown in fig. 1 consists of a computer, a program controller, an induction heater, a cooling device, a heating head, a heating coil, a permanent magnet and a thermal infrared imager. The computer is connected with the program controller according to the connection mode shown in figure 1, and the computer synchronously triggers the induction heater and the thermal infrared imager which are connected with the program controller through the program controller. The induction heater receives the trigger signal and applies a pulse current excitation to a heating coil connected with the heating head. The induction heater, the heating head and the heating coil are connected with a cooling device, and the cooling device cools the induction heater, the heating head and the heating coil by using cooling water circulating in the device. As can be seen from fig. 2, the relative permeability of the ferromagnetic material decreases with increasing magnetic field strength, and eventually reaches saturation. The ferromagnetic material reaches magnetic saturation in the magnetic field generated by the permanent magnet shown in fig. 1, and then eddy current is generated by the heating coil, and the eddy current in turn generates joule heat, thereby causing a change in the surface temperature of the material. When defects are present in the ferromagnetic material, as shown in fig. 3(a) and 3(b), the defects affect the distribution of eddy currents, which in turn affects the distribution of the temperature field at the surface of the material. And finally, acquiring the temperature change through a thermal infrared imager and carrying out nondestructive evaluation on the ferromagnetic material through analyzing the acquired image sequence. The present invention will be described in further detail with reference to specific examples.
A permanent magnet-based magnetic saturation pulse eddy current infrared experiment system and a nondestructive evaluation method comprise the following steps:
step 1: building an experimental device, wherein the experimental device consists of a computer, a program controller, an induction heater, a cooling device, a heating head, a heating coil, a permanent magnet and a thermal infrared imager; the computer is used for controlling the program controller and receiving an image sequence collected by the thermal infrared imager, and the program controller synchronously triggers the induction heater and the thermal infrared imager; the induction heater applies pulse excitation current to a heating coil connected with the heating head after receiving the trigger signal, the heating coil and the permanent magnet are placed above the ferromagnetic material, and meanwhile, the cooling device cools the induction heater, the heating head and the heating coil; the thermal infrared imager starts to acquire an image sequence of the ferromagnetic material and transmits the image sequence to the computer after receiving a trigger signal from the program controller;
step 2: firstly, opening a cooling device, placing a permanent magnet and a heating coil above a ferromagnetic material, then carrying out temperature calibration on a thermal infrared imager, and carrying out focusing operation after the calibration is finished, so as to ensure that an image of the ferromagnetic material in the thermal infrared imager is clear, and simultaneously, the distance between the thermal infrared imager and the heating coil and the distance between the thermal infrared imager and the permanent magnet are both required to be larger than 500mm, so that the magnetic field generated by the heating coil and the magnetic field generated by the permanent magnet are prevented from influencing the performance of the thermal infrared imager;
and step 3: setting parameters of an excitation current applied to a heating coil by an induction heater in a program controller, including: current amplitude, excitation frequency and excitation time; then setting parameters of an infrared thermal imager for acquiring an image sequence in a program controller, wherein the parameters comprise: sampling frequency and total acquisition time; the total acquisition time must be greater than the excitation time;
and 4, step 4: the computer is used for controlling the program controller to simultaneously provide a trigger signal for the induction heater and the thermal infrared imager, the induction heater receives the trigger signal and simultaneously applies a pulse excitation current to the heating coil, and the expression of the excitation wave is shown as the formula (1); meanwhile, when the infrared thermal imager receives a trigger signal sent by the program controller, the infrared thermal imager starts to acquire the change of the surface temperature of the ferromagnetic material.
I(t)＝I0×(1-e-10000t)×sin(ωt) (1)
In the formula: i (t) represents the excitation current value at time t, I0Representing the amplitude of the pulse excitation current, omega is the angular frequency of the pulse excitation current, and t is time;
the pulse current in the heating coil can excite an alternating magnetic field in space, and the ferromagnetic material can generate eddy current in the alternating magnetic field. Under the action of the constant magnetic field generated by the permanent magnet, the ferromagnetic material reaches a magnetic saturation state, and the magnetic permeability of the ferromagnetic material is reduced, so that the penetration depth of eddy current in the ferromagnetic material is increased. According to joule's law, part of eddy current is converted from electric energy to heat energy in the material, and the generated joule heat Q is proportional to the eddy current density JsAnd electric field density E:
in the formula: σ represents the electrical conductivity of the ferromagnetic material; j. the design is a squaresRepresents the eddy current density; e represents the electric field intensity, and its expression is represented by formula (3).
In the formula: a represents a magnetic vector position, and can be obtained by formula (4); t represents time.
In the formula: μ represents the permeability of the ferromagnetic material;
joule heat Q generated by the eddy current will propagate inside the ferromagnetic material, and the propagation rule thereof follows equation (5).
In the formula: ρ represents the density of the ferromagnetic material; cpRepresents the specific heat capacity of the ferromagnetic material; k represents the thermal conductivity of the ferromagnetic material; t represents a temperature; q represents Joule heat.
When defects exist on the surface or inside of the ferromagnetic material, the defects influence the distribution of an eddy current field, namely the distribution of a joule heat source, and influence the heat conduction process, so that the surface temperature distribution of the ferromagnetic material is uneven, and the defects can be finally reflected in an image sequence acquired by a thermal infrared imager. Under the action of a constant magnetic field generated by the permanent magnet, the relative magnetic permeability of the ferromagnetic material is reduced, the penetration of eddy current is increased, and the depth of heat conduction is larger, so that compared with the traditional pulsed eddy current infrared nondestructive detection method, the method disclosed by the invention has the advantage that the detection capability of the method for the defects in a deeper position is enhanced.
And 5: positioning and quantifying defects in the ferromagnetic material through an image sequence acquired by a thermal infrared imager; because the defects on the surface or inside of the ferromagnetic material can influence the heat conduction process, the temperature distribution near the defects and the temperature distribution without the defects have larger difference, and the defects in the ferromagnetic material can be positioned and quantified by analyzing the temperature distribution cloud images on the image sequence acquired by the thermal infrared imager.
Claims (1)
1. A permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method is characterized by comprising the following steps: the method is used for positioning and quantitatively evaluating defects in the ferromagnetic material and comprises the following steps:
step 1: building an experimental device, wherein the experimental device consists of a computer, a program controller, an induction heater, a heating head, a heating coil, a cooling device, a permanent magnet and a thermal infrared imager; the computer is used for controlling the program controller and receiving an image sequence collected by the thermal infrared imager, and the program controller synchronously triggers the induction heater and the thermal infrared imager; the induction heater applies pulse excitation current to a heating coil connected with the heating head after receiving the trigger signal, the heating coil and the permanent magnet are placed above the ferromagnetic material, and meanwhile, the cooling device cools the induction heater, the heating head and the heating coil; the thermal infrared imager starts to acquire an image sequence of the ferromagnetic material and transmits the image sequence to the computer after receiving a trigger signal from the program controller;
step 2: firstly, opening a cooling device, placing a permanent magnet and a heating coil above a ferromagnetic material, then carrying out temperature calibration on a thermal infrared imager, and carrying out focusing operation after the calibration is finished, so as to ensure that an image of the ferromagnetic material in the thermal infrared imager is clear, and simultaneously, the distance between the thermal infrared imager and the heating coil and the distance between the thermal infrared imager and the permanent magnet are both required to be larger than 500mm, so that the magnetic field generated by the heating coil and the magnetic field generated by the permanent magnet are prevented from influencing the performance of the thermal infrared imager;
and step 3: setting parameters of an excitation current applied to a heating coil by an induction heater in a program controller, including: current amplitude, excitation frequency and excitation time; then setting parameters of an infrared thermal imager for acquiring an image sequence in a program controller, wherein the parameters comprise: sampling frequency and total acquisition time; the total acquisition time must be greater than the excitation time;
and 4, step 4: the computer is used for controlling the program controller to simultaneously provide a trigger signal for the induction heater and the thermal infrared imager, the induction heater receives the trigger signal and simultaneously applies a pulse excitation current to the heating coil, and the expression of the excitation wave is shown as the formula (1); meanwhile, when the infrared thermal imager receives a trigger signal sent by the program controller, the change of the surface temperature of the ferromagnetic material is collected;
I(t)＝I0×(1-e-10000t)×sin(ωt) (1)
in the formula: i (t) represents the excitation current value at time t, I0Representing the amplitude of the pulse excitation current, omega is the angular frequency of the pulse excitation current, and t is time;
the pulse current in the heating coil can excite an alternating magnetic field in space, and the ferromagnetic material can generate eddy current in the alternating magnetic field; under the action of the constant magnetic field generated by the permanent magnet, the ferromagnetic material reaches a magnetic saturation state,the magnetic permeability of the ferromagnetic material is reduced, so that the penetration depth of the eddy current in the ferromagnetic material is increased; according to joule's law, the eddy current is converted from electric energy to heat energy in the material, and the generated joule heat Q is proportional to the eddy current density JsAnd electric field intensity E:
in the formula: σ represents the electrical conductivity of the ferromagnetic material; j. the design is a squaresRepresents the eddy current density; e represents the electric field intensity, and its expression is represented by formula (3);
in the formula: a represents a magnetic vector position, and can be obtained by formula (4); t represents time;
in the formula: μ represents the permeability of the ferromagnetic material;
joule heat Q generated by the eddy current will propagate inside the ferromagnetic material, the propagation law of which follows equation (5);
in the formula: ρ represents the density of the ferromagnetic material; cpRepresents the specific heat capacity of the ferromagnetic material; k represents the thermal conductivity of the ferromagnetic material; t represents a temperature; q represents Joule heat;
when defects exist on the surface or inside of the ferromagnetic material, the defects influence the distribution of an eddy current field, namely the distribution of a joule heat source, and influence the heat conduction process, so that the temperature distribution on the surface of the ferromagnetic material is not uniform, and the defects are finally reflected in an image sequence acquired by a thermal infrared imager; under the action of a constant magnetic field generated by the permanent magnet, the magnetic conductivity of the ferromagnetic material is reduced, and the penetration depth of the eddy current is increased, so that the depth of a joule heat source and heat conduction is larger, and the detection capability of the defect at a deeper position is enhanced;
and 5: positioning and quantifying defects in the ferromagnetic material through an image sequence acquired by a thermal infrared imager; because defects on the surface or inside of the ferromagnetic material can influence the distribution of a joule heat source and the heat conduction process, the temperature distribution near the defects and the temperature distribution without the defects have larger difference, and the defects in the ferromagnetic material can be positioned and quantified by analyzing a temperature distribution cloud chart on an image sequence acquired by a thermal infrared imager.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010852766.8A CN111982967A (en) | 2020-08-22 | 2020-08-22 | Permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010852766.8A CN111982967A (en) | 2020-08-22 | 2020-08-22 | Permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111982967A true CN111982967A (en) | 2020-11-24 |
Family
ID=73443000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010852766.8A Pending CN111982967A (en) | 2020-08-22 | 2020-08-22 | Permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111982967A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740380A (en) * | 2021-08-17 | 2021-12-03 | 华中科技大学 | Crack magnetic powder detection method based on temperature difference |
| CN114354354A (en) * | 2021-12-09 | 2022-04-15 | 万向一二三股份公司 | Method for evaluating influence of subcritical abuse on performance of lithium ion battery |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08160008A (en) * | 1994-12-05 | 1996-06-21 | Mitsubishi Heavy Ind Ltd | Non-destructive inspecting method for defect |
| JP4756409B1 (en) * | 2011-02-18 | 2011-08-24 | 大日機械工業株式会社 | Nondestructive inspection apparatus and nondestructive inspection method using alternating magnetic field |
| CN103499636A (en) * | 2013-10-11 | 2014-01-08 | 中国科学院大学 | Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force |
| CN104764770A (en) * | 2015-03-30 | 2015-07-08 | 南京航空航天大学 | Pulsed eddy current infrared thermal imaging detection system and method for steel rail cracks |
| CN104950039A (en) * | 2015-06-23 | 2015-09-30 | 西安交通大学 | Ferromagnetic pipeline quantitative lossless evaluating method based on nonlinear magnetic saturation pulsed eddy current |
| CN105784763A (en) * | 2016-05-05 | 2016-07-20 | 电子科技大学 | Inductive thermal image nondestructive detector based on magnetic core encircled coil structure |
| CN106950278A (en) * | 2017-03-07 | 2017-07-14 | 重庆大学 | Nondestructive detection system and method based on impulse eddy current thermo-acoustic technology |
| 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 |
| CN108195884A (en) * | 2018-01-12 | 2018-06-22 | 西南科技大学 | A kind of lossless detection method and system based on current vortex pulse thermal imaging |
| CN110261469A (en) * | 2019-04-25 | 2019-09-20 | 北京工业大学 | A kind of electromagnetism mixing detection method for the detection of ferrimagnet fatigue damage |
-
2020
- 2020-08-22 CN CN202010852766.8A patent/CN111982967A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08160008A (en) * | 1994-12-05 | 1996-06-21 | Mitsubishi Heavy Ind Ltd | Non-destructive inspecting method for defect |
| JP4756409B1 (en) * | 2011-02-18 | 2011-08-24 | 大日機械工業株式会社 | Nondestructive inspection apparatus and nondestructive inspection method using alternating magnetic field |
| CN103499636A (en) * | 2013-10-11 | 2014-01-08 | 中国科学院大学 | Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force |
| CN104764770A (en) * | 2015-03-30 | 2015-07-08 | 南京航空航天大学 | Pulsed eddy current infrared thermal imaging detection system and method for steel rail cracks |
| CN104950039A (en) * | 2015-06-23 | 2015-09-30 | 西安交通大学 | Ferromagnetic pipeline quantitative lossless evaluating method based on nonlinear magnetic saturation pulsed eddy current |
| CN105784763A (en) * | 2016-05-05 | 2016-07-20 | 电子科技大学 | Inductive thermal image nondestructive detector based on magnetic core encircled coil structure |
| CN106950278A (en) * | 2017-03-07 | 2017-07-14 | 重庆大学 | Nondestructive detection system and method based on impulse eddy current thermo-acoustic technology |
| 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 |
| CN108195884A (en) * | 2018-01-12 | 2018-06-22 | 西南科技大学 | A kind of lossless detection method and system based on current vortex pulse thermal imaging |
| CN110261469A (en) * | 2019-04-25 | 2019-09-20 | 北京工业大学 | A kind of electromagnetism mixing detection method for the detection of ferrimagnet fatigue damage |
Non-Patent Citations (6)
| Title |
|---|
| CHANGHANG XU等: "An improved method of eddy current pulsed thermography to detect subsurface defects in glass fiber reinforced polymer composites", 《COMPOSITE STRUCTURES》 * |
| ZONGFEI TONG 等: "An efficient electromagnetic and thermal modelling of eddy current pulsed thermography for quantitative evaluation of blade fatigue cracks in heavy-duty gas turbines", 《MECHANICAL SYSTEMS AND SIGNAL PROCESSING》 * |
| 左宪章等: "脉冲涡流热成像裂纹检测机理仿真分析", 《激光与红外》 * |
| 敬好青等: "非铁磁性管件电磁超声检测的混合仿真方法", 《应用力学学报》 * |
| 白利兵: "电涡流脉冲热成像无损检测技术研究", 《中国博士学位论文全文数据库工程科技Ⅰ辑》 * |
| 蔡瑞等: "金属小径管损伤电磁超声导波检测的高效混合仿真方法及导波换能器可行性研究", 《机械工程学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740380A (en) * | 2021-08-17 | 2021-12-03 | 华中科技大学 | Crack magnetic powder detection method based on temperature difference |
| CN113740380B (en) * | 2021-08-17 | 2022-07-12 | 华中科技大学 | Crack magnetic powder detection method based on temperature difference |
| CN114354354A (en) * | 2021-12-09 | 2022-04-15 | 万向一二三股份公司 | Method for evaluating influence of subcritical abuse on performance of lithium ion battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Liu et al. | Natural crack diagnosis system based on novel L-shaped electromagnetic sensing thermography | |
| CN103163216B (en) | A kind of metallic conductor defect recognition based on giant magnetoresistance sensor and method of estimation | |
| Oswald-Tranta | Thermoinductive investigations of magnetic materials for surface cracks | |
| CN103257181B (en) | Sheet metal defect detecting device and method under a kind of high-speed motion state | |
| Cheng et al. | Enhanced laser-based magneto-optic imaging system for nondestructive evaluation applications | |
| CN111982967A (en) | Permanent magnet-based magnetic saturation pulse eddy current infrared nondestructive evaluation method | |
| CN209589902U (en) | A kind of infrared thermal imagery method concrete crack detector based on electromagnetic induction heating | |
| He et al. | Research on temperature distribution law around crack using the moving mode of eddy current thermography | |
| Yang et al. | Logarithmic analysis of eddy current thermography based on longitudinal heat conduction for subsurface defect evaluation | |
| CN111982968A (en) | Magnetic management self-adaptive magnetic saturation eddy current infrared evaluation method based on controllable excitation | |
| He et al. | Defect identification and evaluation based on three-dimensional magnetic field measurement of pulsed eddy current | |
| Zhang et al. | Mechanism study for directivity of TR probe when applying Eddy current testing to ferro-magnetic structural materials | |
| Ma et al. | Influence of hysteresis effect on contrast of welding defects profile in magneto-optical image | |
| Li et al. | Microcracks detection based on shuttle-shaped electromagnetic thermography | |
| US20070230536A1 (en) | Method and apparatus for detection of flaws in a metal component | |
| CN106645289A (en) | Nondestructive detection system and method based on infrared magneto-optic imaging | |
| CN110376249A (en) | A kind of current vortex thermal imaging testing method and device | |
| Singh et al. | Thickness evaluation of aluminium plate using pulsed eddy current technique | |
| CN106770625A (en) | A kind of alternating magnetic field magneto-optic imaging detection device and system | |
| Roy et al. | An electromagnetic sensing device for microstructural phase determination of steels through non-destructive evaluation | |
| CN206671257U (en) | A kind of alternating magnetic field magneto-optic imaging detection device and system | |
| CN101581699B (en) | Pulse eddy nondestructive testing method based on time gate | |
| Liu et al. | Numerical simulation of defect inspection using electromagnetically stimulated thermography | |
| CN113030164B (en) | Metal material thermal parameter comprehensive evaluation method based on induction heating | |
| Cao et al. | Research on the device of differential excitation type eddy current testing for metal defect detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201124 |
|
| RJ01 | Rejection of invention patent application after publication |