CN108918657A - A kind of workpiece, defect detection system - Google Patents
A kind of workpiece, defect detection system Download PDFInfo
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- CN108918657A CN108918657A CN201810818695.2A CN201810818695A CN108918657A CN 108918657 A CN108918657 A CN 108918657A CN 201810818695 A CN201810818695 A CN 201810818695A CN 108918657 A CN108918657 A CN 108918657A
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- 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
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/85—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using magnetographic methods
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Abstract
The invention discloses a kind of workpiece, defect detection systems, including：Magnetic field generation device, for generating magnetic vector in the magnetic field of Space Rotating to detected workpiece；Magnetic field distribution corresponding record for being detected Distribution of Magnetic Field on workpiece to polarize photoinduction, and is light distribution image by first sensor；Second sensor, for measuring the magnetic field strength on detected workpiece respectively in three orthogonal directions, simultaneously corresponding record is electric signal；Processing unit, the light distribution image for that will measure exports display, and is calculated according to the electric signal waveform of second sensor record and be detected the position of defect and depth information on workpiece.Workpiece, defect detection system of the present invention, it can be applied to the defect condition of on-line checking workpiece in welding process, it is able to detect the surface defect, near surface flaw and internal flaw of workpiece, the topographical information of workpiece, defect can be obtained by the light distribution image of acquisition, and can relatively precisely obtain the depth and location information of workpiece, defect.
Description
Technical field
The present invention relates to defect detecting technique fields, more particularly to a kind of workpiece, defect detection system.
Background technique
In recent years, laser welding occupies increasingly consequence in the industrial production, and the height of welding quality is directly determined
The quality level of fixed output quota product.Due to being influenced by a variety of disturbing factors of welding scene, welding process often will appear unstable shape
Condition, so cause to crack, be unfused, lack of penetration, welding defects, these defects such as recess, slag inclusion or stomata can be reduced
Section of weld joint product, reduces bearing capacity, generates stress and concentrates, reduces fatigue strength, and weldment rupture is easily caused to lead to brittle failure,
Maximum middle harm is weld crack and incomplete fusion.Therefore, to ensure welding quality, welding defect shape is detected in the welding process
Condition becomes particularly important.
Comprehensive domestic and international present Research, lossless detection method mainly include visual inspection, ray detection method, ultrasonic wave inspection
This five kinds of methods of survey method, Liquid penetrant testing method and Magnetic testing method, the cardinal principle of above-mentioned various detection methods are as follows：
(1) visual inspection need to be scarce by means of manually carrying out in conjunction with relevant speciality rudimentary knowledge abundant and empirical analysis
Sunken detection and identification, it is relatively high to the technical requirements of testing staff.
(2) ray detection method is to penetrate workpiece using ray (x-ray or gamma-rays), using film everywhere gray scale difference as remembering
Record information is to differentiate defect.This method requires the simple shape for being detected material, and ray has injury to human body, needs to examine
Consider the security protection problem of human body, overall cost is higher.
(3) ultrasonic detection method is solid propagation characteristic based on ultrasound, that is, is being detected fault location sound in material
Wave is different, by record to acoustic wave energy and processing, shows the waveform of different height and spacing, and then to determine in material
The size and location of portion's defect.This method is less intuitive to the display result of defect and is not easy to persistence, it is difficult to butt welding
It connects the information such as pattern, the position of defect and does accurate quantitative analysis.
(4) Liquid penetrant testing method is a kind of than older method, and Liquid penetrant testing method includes bleeding agent, cleaning agent and imaging agent three
Part.By applying the bleeding agent containing color or fluorescent material in detected workpiece surface, make to seep based on capillary theory
Saturating agent is penetrated into and is stayed in defect, washes away the bleeding agent of excess surface, then coat one layer of developer, is made by means of capillary attraction effect
Bleeding agent in defect is sucked out.It is shone by color comparison or ultraviolet light irradiation excitation fluorescent material, thus by the figure of defect
As displaying.The surface opening that this method is mainly used in detection non-absorbent material (such as steel, non-ferrous metal etc.) lacks
It falls into, the shape and size being unable to inside the depth and defect of display defect.
(5) Magnetic testing method is by ferrimagnet direct-electrifying stream or to be placed in magnetic field, makes its magnetization.After magnetization
The magnetic line of force of material distribution is detected when encountering defect, it is discontinuous due to fault location, it can make to be detected material table around defect
The magnetic line of force distribution in face generates the leakage field of local distortion, and magnetic flux leakage will attract magnetic powder, and show magnetic by certain illumination condition
Powder trace detects the information such as the size of defect, position using the discontinuity of magnetic powder trace indirectly.This method cannot be examined
Survey the internal flaw of workpiece, it is difficult to determine the depth of defect.
In the above various detection methods, visual inspection, Liquid penetrant testing method and Magnetic testing method are not suitable for on-line checking
The defect condition of welding workpiece, though and ray detection method and ultrasonic Detection Method can be used in on-line checking, be individually present one
Determine drawback, and all can not achieve the depth that defect can be relatively precisely obtained while obtaining workpiece, defect topographical information and
Location information.
Summary of the invention
The object of the present invention is to provide a kind of workpiece, defect detection systems, can be applied to on-line checking work in welding process
The defect condition of part is able to detect the surface defect, near surface flaw and internal flaw of workpiece, can obtain the pattern of defect
Information, and relatively precisely obtain the depth and location information of defect.
To achieve the above object, the present invention provides the following technical solutions：
A kind of workpiece, defect detection system, including：
Magnetic field generation device, for generating magnetic vector in the magnetic field of Space Rotating to detected workpiece；
First sensor, for being detected Distribution of Magnetic Field on workpiece described in photoinduction to polarize, and by magnetic field distribution
Corresponding record is light distribution image；
Second sensor, for measuring on the detected workpiece magnetic field strength respectively in three orthogonal directions and right
It should be recorded as electric signal；
Processing unit, the light distribution image for that will measure exports display, and is remembered according to the second sensor
The electric signal waveform of record calculates the position of defect and depth information on the detected workpiece.
Preferably, the first sensor includes light source, the first polarizer, reflecting element, deielectric-coating, reflecting surface,
Two polarizers and image device；
First polarizer is used to the light that the light source issues being converted to polarised light；
The reflecting element is used to reflex to the light being emitted the deielectric-coating by first polarizer, and light passes through institute
The reflecting surface is incident on after giving an account of plasma membrane；
The image device, which is used to receive, successively passes through the deielectric-coating, described second by the light that the reflective surface returns
Light after polarizer, record form light distribution image.
Preferably, first polarizer and the deielectric-coating, the reflecting surface are located at mutually orthogonal direction, described
Reflecting element is 45 degree of settings with the angle of reflecting surface and the direction of the first polarizer emergent light.
Preferably, the magnetic field generation device, which is located at, is detected workpiece side, and the first sensor and described second passes
Sensor is located at the detected workpiece other side, and the deielectric-coating of the first sensor, the reflecting surface are towards the quilt
Detect workpiece.
Preferably, the first sensor, the second sensor are disposed side by side in same box body.
Preferably, voltage sensor data line, magneto-optic sensing data line and the AC power source being connect with the first sensor
Wiring is drawn to outside box body；
The position that the first sensor is corresponded on the outside of the box body is provided with power switch, pause button and electric current
Regulation button；
The position that the second sensor is corresponded on the outside of the box body is provided with connecting plate, passes through the company by screw
It fishplate bar, the box body plate and penetrates the second sensor second sensor is installed.
Preferably, the magnetic field generation device includes two pairs of magnetic yokes, line and another pair magnetic yoke between one pair of them magnetic yoke
Between line intersect；
The workpiece, defect detection system further include be respectively connected with two pairs of magnetic yokes, for being passed through respectively to two pairs of magnetic yokes
The AC power source of sinusoidal ac with preset phase difference.
The workpiece, defect detection system further include be respectively connected with two pairs of magnetic yokes, for being passed through respectively to two pairs of magnetic yokes
The AC power source of sinusoidal ac with preset phase difference.
Preferably, further include：For placing the motion platform of the detected workpiece, and for driving the movement flat
The mobile miniature Industrial Control Computer of platform, the motion platform is can be in the triaxial movement platform of three-dimensional direction moving.
Preferably, the processing unit is also used to extract the light distribution image characteristic processing and model is known
Other places reason, and determine the type of defect on the detected workpiece.
As shown from the above technical solution, workpiece, defect detection system provided by the present invention, including magnetic field generation device,
One sensor, second sensor and processing unit.Wherein, magnetic field generation device generates magnetic vector in the magnetic of Space Rotating to workpiece
?.Distribution of Magnetic Field corresponding record is light distribution image to polarize Distribution of Magnetic Field on photoinduction workpiece by first sensor, the
Magnetic field strength and corresponding record on two sensor measurement workpiece respectively in three orthogonal directions are electric signal, and processing unit will
The light distribution image of measurement exports display, and the pattern of workpiece, defect, and root can be observed according to the light distribution image of display
The position of defect and depth information on workpiece are calculated according to the electric signal waveform of second sensor record.
Workpiece, defect detection system provided by the invention can be applied to the defect shape of on-line checking workpiece in welding process
Condition is able to detect the surface defect, near surface flaw and internal flaw of workpiece, can be obtained by the light distribution image of acquisition
The topographical information of workpiece, defect is obtained, and can relatively precisely obtain the depth and location information of workpiece, defect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of schematic diagram of workpiece, defect detection system provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of two pairs of magnetic yokes in magnetic field generation device in the embodiment of the present invention；
Fig. 3 is the schematic diagram of first sensor in the embodiment of the present invention；
Fig. 4 (a) is Distribution of Magnetic Field schematic diagram of the magnetic direction with weld seam when parallel；
Fig. 4 (b) is Distribution of Magnetic Field schematic diagram of the magnetic direction with weld seam when vertical；
Fig. 5 is in the embodiment of the present invention in the Distribution of Magnetic Field schematic diagram being detected at workpiece, defect；
Fig. 6 is that first sensor and second sensor are disposed side by side on the intracorporal signal of same box in the embodiment of the present invention
Figure.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
The embodiment of the present invention provides a kind of workpiece, defect detection system, including：
Magnetic field generation device, for generating magnetic vector in the magnetic field of Space Rotating to detected workpiece；
First sensor, for being detected Distribution of Magnetic Field on workpiece described in photoinduction to polarize, and by magnetic field distribution
Corresponding record is light distribution image；
Second sensor, for measuring on the detected workpiece magnetic field strength respectively in three orthogonal directions and right
It should be recorded as electric signal；
Processing unit, the light distribution image for that will measure exports display, and is remembered according to the second sensor
The electric signal waveform of record calculates the position of defect and depth information on the detected workpiece.
Wherein, first sensor is based on m-o effect and measures magnetic field distribution on detected workpiece, by magnetic field strength point
Cloth corresponding record is light intensity distributions image.Second sensor measures the magnetic being detected on workpiece respectively in three orthogonal directions
Field intensity can measure to obtain the electric signal waveform of fluctuating change with the rotationally-varying of space magnetic field locating for workpiece.
The light intensity distributions image output display that processing unit measures first sensor, can be intuitively according to image
Observe the topographical informations such as size, shape of defect on workpiece.Also, the telecommunications that processing unit can be recorded according to second sensor
Number waveshape is detected the position of defect and depth information on workpiece.
From the foregoing, it can be seen that workpiece, defect detection system provided in this embodiment, can be applied to examine online in welding process
The defect condition for surveying workpiece, is able to detect the surface defect, near surface flaw and internal flaw of workpiece, can obtain workpiece and lack
Sunken topographical information, and can relatively precisely obtain the depth and location information of workpiece, defect.
The present embodiment workpiece, defect detection system is described in detail with reference to the accompanying drawings and detailed description.
Referring to FIG. 1, a kind of workpiece, defect detection system provided in this embodiment includes that magnetic field generation device 1, first passes
Sensor, second sensor and processing unit 5.
Magnetic field generation device 1 is used to generate magnetic vector in the magnetic field of Space Rotating to detected workpiece 8.It is being embodied
When, magnetic field generation device 1 may include two pairs of magnetic yokes, referring to FIG. 2, between one pair of them magnetic yoke (including magnetic yoke 10 and magnetic yoke 11)
Line between line and another pair magnetic yoke (including magnetic yoke 12 and magnetic yoke 13) intersects.This workpiece, defect detection system further includes with two
To the AC power source 4 that magnetic yoke is respectively connected with, the AC power source 4 to two pairs of magnetic yokes for being passed through with preset phase difference respectively
Sinusoidal ac.Two pairs of magnetic yokes generate two magnetic directions and magnitude of field intensity all changing magnetic fields in the case where exchanging electro ultrafiltration,
The direction that a pair of magnetic yoke generates magnetic field is changed periodically along the line between corresponding two magnetic yokes.Rotating excitation field then by this two
It is a to be added to be formed along the continually changing magnetic field of straight line, i.e., rotating excitation field, two alternation magnetic are generated by two alternating magnetic field superpositions
Field has certain phase difference.
First sensor is used for polarize and be detected Distribution of Magnetic Field on workpiece 8 described in photoinduction, and by magnetic field distribution
Corresponding record is light distribution image.
In a specific embodiment, referring to FIG. 3, the first sensor includes light source 20, the first polarizer
21, reflecting element 22, deielectric-coating 23, reflecting surface 24, the second polarizer 25 and image device 26；First polarizer 21
Light for issuing the light source 20 is converted to polarised light；The reflecting element 22 is used for will be by first polarizer 21
The light of outgoing reflexes to the deielectric-coating 23, and light is incident on the reflecting surface 24 after the deielectric-coating 23；The imager
Part 26 is used to receive the light that is reflected back by the reflecting surface 24 successively after the deielectric-coating 23, second polarizer 25
Light, record form light distribution image.
The first sensor is based on faraday's m-o effect and realizes to polarize photoinduction and be detected Distribution of Magnetic Field on workpiece
Distribution of Magnetic Field variation corresponding record is light distribution image by variation.Faraday's m-o effect is specially：When a branch of polarised light
When being propagated in magnet-optical medium, if applying an external magnetic field along the direction of light propagation, after polarised light passes through medium, the vibration of light
Face can rotate.
Working principle based on first sensor in this present embodiment is：Magnetic field generation device is generated to detected workpiece
Magnetic field can be distorted in fault location Distribution of Magnetic Field, the vertical magnetic field component at the position is caused to change, polarisation-affecting light
The rotation angle of vibration plane after deielectric-coating.It is different that there is the polarised light of return different vibration plane rotation angles will lead to
Light intensity forms gray value different in image, the topographical information of workpiece, defect can be obtained according to light distribution image, including lack
Fall into size, shape information.
In this sensor, light source 20 can be LED light source, or be also possible to the light source of other types.The imager
Part 26 can be COMS image device, or be also possible to other types of photoelectronic imaging device, in the scope of the present invention
It is interior.Reflecting element 22 can be reflecting mirror, specifically can be the right-angle prism that right-angle surface is reflecting surface.
Further specifically, in this sensor can will first polarizer 21 and the deielectric-coating 23, it is described instead
It penetrates face 24 and is located at mutually orthogonal direction, the reflecting element 22 is with the side of reflecting surface and 21 emergent light of the first polarizer
To angle be 45 degree setting, can refer to shown in Fig. 3.
In practical applications, incorporated by reference to shown in Fig. 3 and Fig. 1, magnetic field generation device 1 can be located at and is detected workpiece 8 one
Side, the first sensor and the second sensor, which are located at, is detected the workpiece other side, the deielectric-coating of the first sensor
23, reflecting surface 24 can refer to shown in Fig. 3 towards detected workpiece 8.By the deielectric-coating 23, reflecting surface 24 and quilt of first sensor
Detecting workpiece 8 keeps plane parallel, can more precisely incude the Distribution of Magnetic Field variation of workpiece area, obtain and be detected workpiece
The magneto optic images.
Fig. 4 (a) and Fig. 4 (b) are please referred to, Fig. 4 (a) is Distribution of Magnetic Field schematic diagram of the magnetic direction with weld seam when parallel, Fig. 4
(b) be Distribution of Magnetic Field schematic diagram of the magnetic direction with weld seam when vertical, compare two figures it is found that make magnetic direction as far as possible with weld seam side
To vertical, the distortion that magnetic field occurs is more obvious, and the magnetic flux leakage of generation is bigger, and obtained the magneto optic images include that weld information is more clear
Clear, the position while welding of detection is more accurate.And the direction in direct current constant magnetic field is single, is only applicable to straight bead tracking, it is difficult to full
The multidirectional of sufficient weld seam.Therefore, magnetic field generation device generates magnetic vector in the magnetic field of Space Rotating in this system, makes it possible to
Clearly light distribution image is obtained, can reflect clearly defect pattern.
The second sensor is used to measure the magnetic field strength on the detected workpiece respectively in three orthogonal directions
And corresponding record is electric signal.The measuring principle of second sensor is：It is in defective workpiece in the magnetic field of rotation, due to
Fault location air reluctance becomes larger, and magnetic field will will appear distortion, generates a magnetic flux leakage, leakage field field intensity and defect on the surface of the material
Depth is related with size.I.e. second sensor is based on Hall effect, and the magnetic field of fault location magnetic field in three orthogonal directions is become
Change is respectively converted into electric signal (voltage) variation.As shown in connection with fig. 5, vertical direction By changes of magnetic field generates voltage peak and peak valley
Distance is characterization defect change width, and the peak value that horizontal direction Bx changes of magnetic field generates is characterization depth of defect variation.
Based on this, the light distribution image of measurement is exported display, and the electricity recorded according to second sensor by processing unit 7
Signal waveform, which calculates, is detected the position of defect and depth information on workpiece.
It can be seen from the above, workpiece, defect detection system provided in this embodiment, can be applied to examine online in welding process
The defect condition for surveying workpiece, is able to detect the surface defect, near surface flaw and internal flaw of workpiece, can obtain workpiece and lack
Sunken topographical information, and can relatively precisely obtain the depth and location information of workpiece, defect.
Further, referring to FIG. 6, first sensor 2, second sensor 3 are disposed side by side in same box body, in this way will
First sensor and the integrated installation of second sensor, are more convenient in practical applications.Specifically, with the first sensor 2
Voltage sensor data line 30, magneto-optic sensing data line 31 and the AC power source wiring 32 of connection are drawn to outside box body；In the box
The position that external side corresponds to the first sensor 2 is provided with power switch 33, pause button 34 and current regulation button 35；
The position that the second sensor 3 is corresponded on the outside of the box body is provided with connecting plate 36, passes through the connection by screw 37
It plate 36, the box body plate and penetrates the second sensor 3 second sensor is installed.
It is further preferred that the processing unit 5 is also used to extract characteristic processing and mould to light distribution image
Type identifying processing, and determine the type of defect on the detected workpiece.For the light distribution image of acquisition, to image zooming-out
Feature simultaneously carries out model identification, can determine the type of existing defects on detected workpiece, for example be crackle, lack of penetration, unmelted
The defects of closing, being recessed type.
In the specific implementation, processing unit 5 can be computer.
Further, the present embodiment workpiece, defect detection system further includes the movement for placing the detected workpiece 8
Platform 6, and the miniature Industrial Control Computer 7 for driving the motion platform 6 mobile, the motion platform 6 is can be in three-dimensional
The mobile triaxial movement platform in direction.
A kind of workpiece, defect detection system provided by the present invention is described in detail above.Tool used herein
Principle and implementation of the present invention are described for body example, the above embodiments are only used to help understand this hair
Bright method and its core concept.It should be pointed out that for those skilled in the art, not departing from the present invention
, can be with several improvements and modifications are made to the present invention under the premise of principle, these improvement and modification also fall into right of the present invention
It is required that protection scope in.
Claims (9)
1. a kind of workpiece, defect detection system, which is characterized in that including：
Magnetic field generation device, for generating magnetic vector in the magnetic field of Space Rotating to detected workpiece；
First sensor, for being detected Distribution of Magnetic Field on workpiece described in photoinduction to polarize, and magnetic field distribution is corresponding
It is recorded as light distribution image；
Second sensor, for measuring magnetic field strength and corresponding note on the detected workpiece respectively in three orthogonal directions
Record is electric signal；
Processing unit, the light distribution image for that will measure export display, and according to second sensor record
Electric signal waveform calculates the position of defect and depth information on the detected workpiece.
2. workpiece, defect detection system according to claim 1, which is characterized in that the first sensor include light source,
First polarizer, reflecting element, deielectric-coating, reflecting surface, the second polarizer and image device；
First polarizer is used to the light that the light source issues being converted to polarised light；
The reflecting element is used to reflex to the light being emitted the deielectric-coating by first polarizer, and light is by being given an account of
The reflecting surface is incident on after plasma membrane；
The image device is used to receive the light returned by the reflective surface successively by the deielectric-coating, second polarization
Light after element, record form light distribution image.
3. workpiece, defect detection system according to claim 2, which is characterized in that first polarizer with given an account of
Plasma membrane, the reflecting surface are located at mutually orthogonal direction, and the reflecting element is emitted with reflecting surface and first polarizer
The angle in the direction of light is 45 degree of settings.
4. workpiece, defect detection system according to claim 2, which is characterized in that the magnetic field generation device is located at tested
Workpiece side is surveyed, the first sensor and the second sensor are located at the detected workpiece other side, and described first passes
The deielectric-coating of sensor, the reflecting surface are towards the detected workpiece.
5. workpiece, defect detection system according to claim 1, which is characterized in that the first sensor, described second
Sensor is disposed side by side in same box body.
6. workpiece, defect detection system according to claim 5, which is characterized in that the electricity being connect with the first sensor
Pressure sensing data line, magneto-optic sensing data line and AC power source wiring are drawn to outside box body；
The position that the first sensor is corresponded on the outside of the box body is provided with power switch, pause button and current regulation
Button；
The position that the second sensor is corresponded on the outside of the box body is provided with connecting plate, passes through the connection by screw
It plate, the box body plate and penetrates the second sensor second sensor is installed.
7. workpiece, defect detection system according to claim 1, which is characterized in that the magnetic field generation device includes two pairs
Magnetic yoke, the line between one pair of them magnetic yoke intersect with the line between another pair magnetic yoke；
The workpiece, defect detection system is respectively connected with two pairs of magnetic yokes, has for being passed through respectively to two pairs of magnetic yokes
The AC power source of the sinusoidal ac of preset phase difference.
8. workpiece, defect detection system according to claim 1-7, which is characterized in that further include：For placing
The motion platform of the detected workpiece, and the miniature Industrial Control Computer for driving the motion platform mobile, the fortune
Moving platform is can be in the triaxial movement platform of three-dimensional direction moving.
9. workpiece, defect detection system according to claim 1-7, which is characterized in that the processing unit is also used
In extracting characteristic processing and model identifying processing to the light distribution image, and determines and lacked on the detected workpiece
Sunken type.
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| CN111751257A (en) * | 2019-03-26 | 2020-10-09 | 中国石油化工股份有限公司 | Rock crack observation device and method |
| CN112857197A (en) * | 2021-04-09 | 2021-05-28 | 中国石油大学(华东) | Rotating electromagnetic field non-ferromagnetic material crack size measurement method |
| CN113664166A (en) * | 2021-06-30 | 2021-11-19 | 武汉钢铁有限公司 | Method for measuring depth of vibration mark |
| CN117252486A (en) * | 2023-11-14 | 2023-12-19 | 长春师范大学 | Automobile part defect detection method and system based on Internet of things |
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