CN115754015A - Electromagnetic ultrasonic and eddy current combined probe and working method thereof - Google Patents
Electromagnetic ultrasonic and eddy current combined probe and working method thereof Download PDFInfo
- Publication number
- CN115754015A CN115754015A CN202211520019.XA CN202211520019A CN115754015A CN 115754015 A CN115754015 A CN 115754015A CN 202211520019 A CN202211520019 A CN 202211520019A CN 115754015 A CN115754015 A CN 115754015A
- Authority
- CN
- China
- Prior art keywords
- eddy current
- coil
- electromagnetic ultrasonic
- electromagnetic
- probe
- 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
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a composite probe of electromagnetic ultrasound and eddy current and a working method thereof, wherein the probe comprises the following components: a housing having a magnet disposed therein; the electromagnetic ultrasonic coil is arranged right below the magnet, and an electromagnetic ultrasonic shielding layer is arranged between the electromagnetic ultrasonic coil and the magnet; the eddy current coil is wound on the outer side of the eddy current shielding layer in the shell, the bottom end of the eddy current coil is flush with the electromagnetic ultrasonic coil and is adjacent to the ceramic chip, and the magnet is positioned on the inner side of the eddy current shielding layer; the lead wire of the eddy current coil and the lead wire of the electromagnetic ultrasonic coil are both led out through the reserved space in the shell and the eddy current shielding layer so as to be convenient for joint connection. The composite probe of electromagnetic ultrasonic and eddy current overcomes the defects that eddy current probe detection is insensitive to the interior of a material and electromagnetic ultrasonic detection is insensitive to the surface of the material, and can separate eddy current signals and electromagnetic ultrasonic signals which are mutually coupled and interfered, thereby improving the detection efficiency and accuracy.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to an electromagnetic ultrasonic and eddy current composite probe and a working method thereof.
Background
The traditional ultrasonic detection mostly adopts a piezoelectric transducer, and has the defect that before each detection, the surface of a test piece is polished to a certain degree, and then a couplant is coated, so that the continuity of the detection is limited in the process, and the detection efficiency is reduced. The electromagnetic ultrasonic probe has the characteristic of non-contact and is insensitive to the surface structure of a test piece, so that the target can be rapidly and continuously detected. Electromagnetic ultrasound utilizes the electromagnetic induction principle, arouses corresponding induced current in the test piece through the high frequency alternating current that lets in the coil, and under the effect of powerful magnet, the particle in the test piece receives the effect of lorentz power to produce the ultrasonic elastic wave, because the ultrasonic elastic wave meets defect or sudden change material boundary can reflect, the back wave propagates to probe department, becomes the electrical signal with mechanical signal, thereby realizes the detection to the test piece internal conditions.
For the detection of surface defects, compared with several common nondestructive detection modes such as magnetic particle detection, X-ray detection and the like, the eddy current detection has better sensitivity, and meanwhile, the eddy current detection does not need a coupling agent and can realize rapid and continuous detection. The eddy current detection utilizes an electromagnetic induction principle, intermediate-frequency excitation current is introduced into an eddy current coil, induced current is generated on the surface of a test piece, and the defect on the surface of the test piece can influence the distribution of the induced current, so that the excitation current is influenced, the impedance of the excitation coil is caused to change, and the defect is detected. However, due to the skin effect, the induced current is difficult to penetrate deep into the test piece, so that the eddy current test is more sensitive to surface defects.
In the related art, a combination of an eddy current coil and an electromagnetic ultrasonic coil is used, and is generally used for detecting the thickness of a test piece. However, this solution has a drawback in that the position of the eddy current coil is usually not reasonable, for example, the eddy current coil is located at the upper portion of the probe sensor, and the electromagnetic ultrasonic coil is located at the lower portion of the probe sensor, so that the design may be to reduce mutual interference between the electromagnetic ultrasonic coil and the eddy current coil when electromagnetic induction occurs, but then the eddy current coil is far away from the test piece when in use, and even if the thickness of the test cannot be detected accurately, the defect information on the surface and inside of the test piece cannot be detected accurately, so the solutions in the related art have a problem that the measurement accuracy and the interference resistance between the two coils cannot be considered at the same time.
Therefore, the invention is provided.
Disclosure of Invention
The invention aims to provide an electromagnetic ultrasonic and eddy current composite probe and a working method thereof, which do not need a coupling agent, can realize quick and non-contact measurement of a test piece and can more accurately acquire the surface and internal information of the test piece simultaneously.
In order to solve the above problem, in a first aspect, an embodiment of the present invention provides a composite probe of electromagnetic ultrasound and eddy current, including:
a housing having a magnet disposed therein; the electromagnetic ultrasonic coil is arranged right below the magnet, and an electromagnetic ultrasonic shielding layer is arranged between the electromagnetic ultrasonic coil and the magnet; the eddy current coil is wound on the outer side of the eddy current shielding layer in the shell, the bottom end of the eddy current coil is flush with the electromagnetic ultrasonic coil and is adjacent to the ceramic chip, and the magnet is positioned on the inner side of the eddy current shielding layer; the lead wire of the eddy current coil and the lead wire of the electromagnetic ultrasonic coil are both led out through the reserved space in the shell and the eddy current shielding layer so as to be convenient for joint connection.
Optionally, the geometry of the magnet is a cylinder, and the magnetic pole direction is parallel to the axis of the cylinder, so that a high-strength magnetic field of 0.8-1T can be generated.
Optionally, the electromagnetic ultrasonic shielding layer is made of copper.
Optionally, the electromagnetic ultrasonic coil has a planar spiral geometry, and the size of the electromagnetic ultrasonic coil is slightly smaller than the bottom surface of the magnet.
Optionally, the electromagnetic ultrasonic coil can generate a signal, can also receive the signal, and is a transceiver coil.
Optionally, the excitation current signal introduced into the electromagnetic ultrasonic coil is a high-frequency current, and the frequency is 1-3 MHz.
Optionally, the eddy current coil can generate a signal, can also receive the signal, and is a transceiver coil.
Optionally, the excitation current introduced into the eddy current coil is an intermediate frequency current, and the frequency is 1 to 3kHz.
Optionally, the material of the eddy current shielding layer is iron.
Optionally, the ceramic plate is circular in geometric shape, and the thickness of the ceramic plate is not more than 3mm.
In a second aspect, an embodiment of the present invention provides an operating method of the above electromagnetic ultrasonic and eddy current composite probe, including:
the method comprises the steps of generating intermediate-frequency and high-frequency excitation currents by a signal generator, enabling the excitation currents to pass through an electromagnetic ultrasonic coil impedance matching circuit and an eddy current coil impedance matching circuit respectively, improving the strength of signals, driving the electromagnetic ultrasonic and eddy current composite probe, simultaneously generating eddy current signals and electromagnetic ultrasonic signals, enabling the eddy current signals and surface defects of a test piece to be induced by an eddy current coil after interaction, enabling the electromagnetic ultrasonic signals and internal defects of the test piece to be induced by the electromagnetic ultrasonic coil after interaction, enabling the electromagnetic ultrasonic signals and the internal defects of the test piece to pass through an electromagnetic ultrasonic signal high-pass filter and an eddy current signal low-pass filter respectively to remove mutual electric signal coupling, amplifying signal characteristics through an amplifying circuit, and displaying carried defect information on a multi-channel oscilloscope through a signal processing module.
Compared with the prior art, the invention has the following beneficial effects:
according to the electromagnetic ultrasonic and eddy current combined probe, the electromagnetic ultrasonic probe and the eddy current probe are integrated on the same probe, eddy current signals and surface defects of a test piece are induced by the eddy current coil after interaction, electromagnetic ultrasonic signals and internal defects of the test piece are induced by the electromagnetic ultrasonic coil after interaction, the internal and the surface of the test piece can be simultaneously detected only by one-time detection, the detection is comprehensive, and the electromagnetic ultrasonic and eddy current combined probe has the characteristics of small volume, convenience in carrying and the like.
The electromagnetic ultrasonic and eddy current composite probe has the advantages of non-contact, simplified detection process and greatly improved detection efficiency due to the fact that electromagnetic coupling is used for energy and information conversion.
According to the electromagnetic ultrasonic and eddy current composite probe, the frequency difference of excitation signals of electromagnetic ultrasonic and eddy current is large, so that a required signal can be conveniently extracted from mutually coupled receiving signals, and the detection precision is improved.
The electromagnetic ultrasonic and eddy current composite probe has the advantages that the eddy current coil is wound on the outer side of the eddy current shielding layer and is separated from the electromagnetic ultrasonic coil, the electromagnetic ultrasonic shielding layer is arranged above the electromagnetic ultrasonic coil, the electromagnetic ultrasonic coil and the eddy current coil can be arranged at positions close to a test piece, the defects on the surface and the inside of the test piece are accurately measured, meanwhile, the mutual influence of the eddy current coil and the electromagnetic ultrasonic coil under electromagnetic induction can be reduced, and the contradiction that the measurement accuracy and the anti-interference performance between the two coils cannot be considered is solved.
The working method of the electromagnetic ultrasonic and eddy current composite probe effectively separates the eddy current signal and the electromagnetic ultrasonic signal which are mutually coupled and interfered, improves the identification characteristics of the eddy current signal and the electromagnetic ultrasonic signal, and improves the detection accuracy.
Drawings
Fig. 1 is a schematic structural diagram of an electromagnetic ultrasonic and eddy current composite probe according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an eddy current shielding layer wound around an eddy current coil of a probe according to an embodiment of the present invention.
Fig. 3 is a structural bottom view of a probe shell according to an embodiment of the present invention.
Fig. 4 is a structural diagram of a probe electromagnetic ultrasonic coil according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a probe-matched testing system according to an embodiment of the present invention.
Wherein: 1-an eddy current coil; 2-a vortex shield layer; 3-an electromagnetic ultrasound coil; 4-ceramic plate; 5-electromagnetic ultrasonic shielding layer; 6-strong magnet; 7-a housing; 8-a top cover; 9-electromagnetic ultrasonic coil outgoing line; 10-eddy current coil lead-out wire.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments shown in the drawings. It should be understood that these embodiments are described only to enable those skilled in the art to better understand and to implement the present invention, and are not intended to limit the scope of the present invention in any way.
Referring to fig. 1-4, an embodiment of the present invention provides a composite electromagnetic ultrasonic and eddy current probe, which can simultaneously excite eddy current and elastic wave to detect the surface and the interior of a test piece.
As an example, the combined electromagnetic ultrasound and eddy current probe comprises a housing, generally cylindrical, with a top cover at the top of the housing, the top cover being configured with an opening for guiding the electromagnetic ultrasound coil leads 9 and the eddy current coil leads 10 inside the housing to pass through, thereby facilitating the connection of the electromagnetic ultrasound coil 3 and the eddy current coil 1 to a signal power line at the end of the probe.
The housing 7 is provided with a cavity, a cylindrical strong magnet 6 is arranged in the cavity, the magnetic pole direction of the strong magnet 6 is parallel to the axis of the cylinder, and a high-strength magnetic field of 0.8-1T can be generated. The bottom of the strong magnet 6 is sequentially provided with an electromagnetic ultrasonic shielding layer 5, an electromagnetic ultrasonic coil 3 and a ceramic chip 4, wherein the geometric shape of the electromagnetic ultrasonic coil 3 is a planar spiral shape, and the size of the electromagnetic ultrasonic coil is slightly smaller than the bottom surface of the strong magnet 6. By the design, the electromagnetic ultrasonic coil 3 can be closer to the test piece 11, more accurate test piece detection information can be obtained, and meanwhile, the electromagnetic ultrasonic shielding layer 5 can also reduce the interference of the electromagnetic ultrasonic coil 3 on the eddy current coil 1. The electromagnetic ultrasonic shielding layer 5 may be made of copper.
The shell of the strong magnet 6 is also provided with an eddy current coil shielding layer 2, and the eddy current coil 1 is wound on the outer side of the eddy current shielding layer 2. The bottom end of the eddy current coil 1 is flush with the electromagnetic ultrasonic coil and is adjacent to the ceramic chip 4, so that the eddy current coil 1 and the shielding layer 2 of the test piece 11 are cylindrical and tubular, the inner wall of the eddy current coil 1 is provided with a groove through which a lead wire 9 of the electromagnetic ultrasonic coil can pass, and the outer wall of the eddy current coil 1 is used for winding the eddy current coil 1. The material of the eddy current shield layer 2 is iron. As one example, the vortex is entrained.
The eddy current coil lead wire 10 and the electromagnetic ultrasonic coil lead wire 9 are both led out through the reserved spaces in the shell 7 and the eddy current shielding layer 2 so as to facilitate joint connection.
As an example, the electromagnetic ultrasonic coil 3 can generate signals and receive signals, and is a transceiver coil. The input excitation current signal is high frequency current with frequency of 1-3 MHz. The eddy current coil 1 can generate signals, can receive signals, and is a coil integrating transmission and receiving. The introduced exciting current is intermediate frequency current, and the frequency is 1-3 kHz.
When the electromagnetic ultrasonic coil 3 is introduced with high-frequency alternating current, under the action of the strong magnet 6, transverse waves are generated in the test piece 11 body right below the electromagnetic ultrasonic coil 3 and are transmitted to the inside of the test piece 11, an echo is generated when the position with a geometrical mutation or a material mutation is encountered, the echo is received by the electromagnetic ultrasonic coil 3, and the electromagnetic force induced by the electromagnetic ultrasonic coil 3 is changed, so that the detection is completed.
When eddy current coil 1 lets in medium frequency alternating current, will produce induced current on test piece 11 surface below eddy current coil 1, the defect that test piece 11 surface exists can cause the change of test piece 11 geometry to influence the distribution of test piece 11 surface current, the change of test piece 11 surface current will be received by eddy current coil 1, thereby accomplishes and detects.
As shown in FIG. 5, the experimental system for matching the electromagnetic ultrasonic and eddy current composite probe of the invention comprises a signal generator, an impedance matching circuit of an electromagnetic ultrasonic coil and an eddy current coil, a composite probe, an eddy current signal low-pass filter circuit, an electromagnetic ultrasonic signal high-pass filter circuit, a signal amplification circuit, a signal processing module and a multi-channel oscilloscope which are connected in a logic sequence; the signal generator is used for generating medium-frequency and high-frequency excitation currents, the excitation currents respectively pass through the electromagnetic ultrasonic coil impedance matching circuit and the eddy current coil impedance matching circuit to improve the strength of signals, then the composite probe of electromagnetic ultrasonic and eddy current is driven, eddy current signals and electromagnetic ultrasonic signals are generated simultaneously, the eddy current signals and surface defects of a test piece are induced by the eddy current coil 1 after interaction, the electromagnetic ultrasonic signals and internal defects of the test piece are induced by the electromagnetic ultrasonic coil 3 after interaction, electric signal coupling between the electromagnetic ultrasonic signals and the eddy current signals is relieved through the electromagnetic ultrasonic signal high-pass filter and the eddy current signal low-pass filter respectively, signal characteristics are amplified through the amplifying circuit, and carried defect information is displayed on the multi-channel oscilloscope through the signal processing module. The composite probe of electromagnetic ultrasonic and eddy current overcomes the defects that the eddy current probe is insensitive to the interior of the material and the electromagnetic ultrasonic detection is insensitive to the surface of the material, and can separate eddy current signals and electromagnetic ultrasonic signals which are mutually coupled and interfered, thereby improving the detection efficiency and accuracy.
The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A composite electromagnetic ultrasound and eddy current probe, comprising:
a housing (7), wherein a magnet (6) is arranged in the housing (7); the electromagnetic ultrasonic coil (3) is arranged right below the magnet (6), and an electromagnetic ultrasonic shielding layer (5) is arranged between the electromagnetic ultrasonic coil (3) and the magnet (6); the eddy current coil (1) is wound on the outer side of the eddy current shielding layer (2) in the shell (7), the bottom end of the eddy current coil is flush with the electromagnetic ultrasonic coil (3) and is adjacent to the ceramic plate (4), and the magnet (6) is positioned on the inner side of the eddy current shielding layer (2); the lead wire (10) of the eddy current coil and the lead wire (9) of the electromagnetic ultrasonic coil are both led out through the reserved spaces in the shell (7) and the eddy current shielding layer (2) so as to facilitate joint connection.
2. The combined electromagnetic ultrasound and eddy current probe according to claim 1, wherein the geometry of the magnet (6) is cylindrical, with the direction of the poles parallel to the cylinder axis, capable of generating high-intensity magnetic fields of 0.8-1T.
3. The combined EMR and eddy current probe as claimed in claim 1, wherein the EMR shielding layer (5) is copper.
4. The combined electromagnetic ultrasound and eddy current probe according to claim 1, wherein the geometry of the electromagnetic ultrasound coil (3) is a planar spiral with a size slightly smaller than the bottom surface of the magnet (6).
5. The combined emultrasound and eddy current probe according to claim 1, wherein the emultrasound coil (3) can both generate and receive signals, being a transceiver-integrated coil.
6. The combined electromagnetic ultrasound and eddy current probe as claimed in claim 1, wherein the excitation current signal passed through the electromagnetic ultrasound coil (3) is a high frequency current with a frequency of 1-3 MHz.
7. The combined EMR and eddy current probe as claimed in claim 1, wherein the eddy current coil (1) is a transceiver integrated coil that can both generate and receive signals.
8. The combined probe of electromagnetic ultrasound and eddy current according to claim 1, wherein the excitation current passed through the eddy current coil (1) is a medium frequency current with a frequency of 1 to 3kHz.
9. The combined emr and eddy current probe according to claim 1, wherein the material of the eddy current shield (2) is iron.
10. A method of operating a combined electromagnetic ultrasound and eddy current probe according to any one of claims 1 to 10, comprising:
the method comprises the steps of generating medium-frequency and high-frequency excitation currents by a signal generator, driving a composite probe of electromagnetic ultrasonic and eddy current after the excitation currents respectively pass through an electromagnetic ultrasonic coil impedance matching circuit and an eddy current coil impedance matching circuit to improve the strength of signals, simultaneously generating eddy current signals and electromagnetic ultrasonic signals, inducing the eddy current signals and surface defects of a test piece by an eddy current coil after interaction, inducing the electromagnetic ultrasonic signals and the internal defects of the test piece by the electromagnetic ultrasonic coil after interaction, removing mutual electric signal coupling through an electromagnetic ultrasonic signal high-pass filter and an eddy current signal low-pass filter respectively, amplifying the characteristics of the signals through an amplifying circuit, and displaying carried defect information on a multi-channel oscilloscope through a signal processing module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211520019.XA CN115754015A (en) | 2022-11-30 | 2022-11-30 | Electromagnetic ultrasonic and eddy current combined probe and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211520019.XA CN115754015A (en) | 2022-11-30 | 2022-11-30 | Electromagnetic ultrasonic and eddy current combined probe and working method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115754015A true CN115754015A (en) | 2023-03-07 |
Family
ID=85341546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211520019.XA Pending CN115754015A (en) | 2022-11-30 | 2022-11-30 | Electromagnetic ultrasonic and eddy current combined probe and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115754015A (en) |
-
2022
- 2022-11-30 CN CN202211520019.XA patent/CN115754015A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107064289B (en) | Method, device and system for multi-mode electromagnetic ultrasonic and magnetic leakage detection and sensor | |
| CN110530978B (en) | Electromagnetic ultrasonic probe, flaw detection device and flaw detection method for continuous detection of high-temperature casting and forging | |
| CN111398413B (en) | Double-layer symmetrical differential plane eddy current detection sensor | |
| US4777824A (en) | Electromagnetic acoustic transducer | |
| CN102661995B (en) | Electromagnetic acoustic and magnetic leakage compounded detection method | |
| CN101713642B (en) | Electromagnetic ultrasonic probe | |
| CN105758938B (en) | 550 DEG C of high temperature metallic material electromagnetic acoustic bulk wave methods of detection and its device | |
| CN109507282A (en) | A kind of pipe surface defect inspection method of electromagnetic acoustic monitoring sensor installation point | |
| CN109444270B (en) | Electromagnetic ultrasonic and pulse eddy current composite detection sensor | |
| CN109444262B (en) | Oblique incidence type electromagnetic acoustic sensor based on oblique static magnetic field | |
| CN104792875B (en) | Flexible electromagnetism ultrasonic testing system and detection method based on two coil configuration | |
| CN110514743A (en) | A kind of electromagnetic supersonic flaw detecting method and device of pipeline defect detection | |
| CN111871747B (en) | Capacitance-sensing type electromagnetic ultrasonic transducer | |
| CN105091728A (en) | Placing type far-field eddy current sensor | |
| CN113176342B (en) | Internally-inserted electromagnetic ultrasonic spiral guided wave transducer and working method thereof | |
| CN104198581A (en) | Lorentz force-based electromagnetic acoustic surface wave sensor with high signal to noise ratio | |
| CN107991393B (en) | Dual-frequency electromagnetic ultrasonic detection system | |
| CN115754015A (en) | Electromagnetic ultrasonic and eddy current combined probe and working method thereof | |
| CN103207239B (en) | A kind of integrated adjustable magnetostriction longitudinal wave guide probe | |
| Rieger et al. | Examination of the liquid volume inside metal tanks using noncontact EMATs from outside | |
| Hughes et al. | High-frequency eddy current measurements using sensor-mounted electronics | |
| CN115265428B (en) | Composite ultrasonic thickness gauge and thickness measuring method thereof | |
| CA2510799C (en) | Electromagnetic ultrasound probe | |
| CN103217481A (en) | Magnetoacoustic tomography-with-magnetic-induction probe applying magnetostriction | |
| CN109470774A (en) | Ultrasonic guided wave focusing energy converter based on aluminium sheet defects 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 |