CN206772898U - A kind of magneto-optic imaging non-destructive detection means - Google Patents
A kind of magneto-optic imaging non-destructive detection means Download PDFInfo
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- CN206772898U CN206772898U CN201720116203.6U CN201720116203U CN206772898U CN 206772898 U CN206772898 U CN 206772898U CN 201720116203 U CN201720116203 U CN 201720116203U CN 206772898 U CN206772898 U CN 206772898U
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Abstract
The utility model discloses a kind of magneto-optic imaging non-destructive detection means, it can be used for the defects of workpiece to detect the quality for example for detecting mould casting, and detection, in the working condition using casting, described device includes direct current electrical interface, exchange electrical interface, controller, magnetic field generator, magneto-optic imaging sensor and computer；The magnetic field generator is electrically connected to direct current electrical interface by the controller and exchanges electrical interface；Direct current electrical interface, it accesses direct current to magnetic field generator；Electrical interface is exchanged, it gives magnetic field generator incoming transport electricity；Magnetic field generator, it gives the workpiece excitation according to the control signal of controller；Magneto-optic imaging sensor, it gathers the magneto optic images of workpiece and is sent to the computer；And it also adjusts the distance of the magnetic pole of the magnetic field generator and workpiece by neck.
Description
Technical field
The present invention relates to the detection field of workpiece, and it is especially a kind of based on the imaging of the magneto-optic of stationary magnetic field and alternating magnetic field
The cannot-harm-detection device, the defects of being applied particularly to workpiece detection for example make for the quality for detecting mould casting, and detection
With the working condition of casting, it includes not welding in the minute scratch marks of workpiece surface, depression, slag inclusion, crackle and welding process
Thoroughly, for fusion, burn-through, overlap, stomata, undercut, arc crater the defects of detect.
Background technology
Automobile, space flight and aviation, steamer etc. all use substantial amounts of metal casting, metallic article and our life breath manner of breathing
Close.Due to the influence for the various random factors such as condition of work is severe, workload is big and quality requirement is high, casting can not can be kept away
Can crack with exempting from, stomata, slag inclusion the defects of.In order to ensure its product quality, it is necessary to detect defect in timely and efficient manner.
In actual production process, except range estimation surface defect is with addition to forming defect, generally also needing to examine using non-destructive testing technology
Survey defect, therefore it is a kind of effectively the defects of lossless detection method have important practical significance.
The Non-Destructive Testing both at home and abroad for defect is concentrated mainly on following several method at present：(1) magnetic powder detection method, i.e.,
Uniformly it is covered with magnetic on workpiece is detected, measured workpiece workpiece, defect can produce the irregular magnetic line of force after magnetization, and these are lacked
Falling into will be shown by the distribution of magnetic.Magnetic testing is generally used for the surface of ferromagnetic workpiece and the inspection of near surface flaw
Survey, its cost is relatively low, and sensitivity is higher and to the requirement of measured workpiece amorphism.But measured workpiece requirement must be paramagnetism
Material, before detection, it is necessary to first workpiece surface is handled, to ensure that workpiece surface is smooth, it is ensured that will not be because of surface not
Flat or scar and influence the distribution of the magnetic line of force, influence testing result.(2) penetrant detecting method, its principle are based on liquid
Capillarity, it is the lossless detection method for detecting workpiece surface flaws, specifically includes two methods of fluorescence and coloring.It is glimmering
The principle of light detection is to immerse measured workpiece in fluorescent liquid, and because of capillarity, fluorescent liquid has been filled inside defect.Remove
Surface liquid, because photoelectric effect fluorescent liquid is under ultraviolet irradiation, sends visible ray and show defect.The original of coloration detection
Reason is similar with fluoroscopic examination, and it does not need Special Equipment, and the coloring liquid adsorbed in defect simply is suctioned out into workpiece with toner
Surface and show defect.This method sensitivity when detecting workpiece surface open-delta winding is high, to surface moisture or painting be present
The sample of layer, meeting extreme influence Detection results, and also the judgement of this method is heavily dependent on the experience of inspector.(3)
Ray detection method, it is that there is certain attenuation law during passing through testee using ray (x-ray, gamma-rays etc.),
A kind of method of inside workpiece defect is detected according to by the transmitted intensity after each position decay of workpiece.Its decay of different objects
Degree is different, the degree of decay by the thickness of object, the material category of object and ray species and determine.Ray detection master
It is used to detect workpiece internal volume type defect, and the thickness of workpiece is not easy more than 80mm, can be according to the decay system of material
Number does corresponding thickening or is thinned.This method testing cost is high, and detection device is larger, caused ray Radiation On Human body injury
Greatly, it is relatively low to the detection sensitivity of micro-crack defect.(4) ultrasonic detection method, its principle are tested using ultrasonic wave
When being propagated in workpiece, it can be influenceed by measured workpiece material acoustics characteristic and the change of its interior tissue, pass through the shadow of ultrasonic wave
The degree of sound and status analysis, to detect the change of material property and structure.The detection efficiency of the detection method is higher, and
Cost is relatively low, but relatively other detection methods, the requirement to operating personnel are higher.The defects of this method is for difference variety classes
There is certain difficulty, the shortcomings that its is maximum is exactly to need couplant when detecting.(5) eddy current detection method, its Cleaning Principle are bases
In electromagnetic induction phenomenon, the magnetic field of change produces vortex in conductor workpiece, if within the workpiece existing defects, be mingled with, conductance
When rate change or structure change, the flowing of vortex can be influenceed so that superposition magnetic field changes, and can sentence according to the change in magnetic field
The defects of disconnected workpiece.This method have detection efficiency it is high, suitable for on-line checking, it is excellent without couplant and non-contact detecting etc.
Point, and the sensitivity near surface or surface defect is higher.But it is only suitable for the detection of conductive material surface and near surface,
It is difficult to species, the shapes and sizes for judging defect.(6) other detection methods.It is by body surface such as laser hologram Non-Destructive Testing
And the defects of inside, by the method for external world's loading, it is caused local deformation in corresponding body surface, use holographic
To observe and more this deformation, and the deformation of the body surface under different extraneous loads effects is recorded, observed
And analysis, then it whether there is defect inside judgment object.Acoustic emission testing technology, be object under extraneous conditioning, lack
Fall into or object abnormal position stress is concentrated and is deformed or is broken, and strain energy is discharged in the form of elastic wave, use instrument
Detect and analyze acoustic emission signal and determine the technology of acoustic emission source.Infrared detection technology, can be constant by one in detection
Hot-fluid injection workpiece, if existing defects in workpiece, because defect area is different from the thermal diffusion coefficient of nondefective zone, then
The Temperature Distribution of workpiece surface will be variant, and the internal defective surface temperature from corresponding to nondefective zone is just different, thus
The infrared waves (heat radiation) sent is also just different, with response infrared ripple and can be converted into corresponding big using infrared detector
The function of small electric signal, point by point scanning workpiece surface are obtained with the distribution situation of workpiece surface temperature, so as to find workpiece
Surface temperature abnormal area, determine the position of inside workpiece defect.
To sum up analysis is understood, lossless detection method used above has its deficiency.Magnetic testing is limited to ferrimagnet,
And there is strict demand to workpiece surface；Liquid penetrant testing is limited to Surface-breaking defect；Ray detection testing cost is high, detection device compared with
Greatly, caused ray Radiation On Human body injury is very big；Requirement of the ultrasound examination to operating personnel is higher, and difference is different types of
Defect has certain difficulty and needs couplant；EDDY CURRENT is only suitable for the detection of conductive material surface and near surface, and is difficult to
Judge species, the shapes and sizes of workpiece, defect；Laser hologram Non-Destructive Testing depends on the defects of interior of articles in outer masterpiece use
The corresponding deformation of body surface can be caused down；Acoustic emission testing technology due to the intensity of acoustic emission signal it is general very weak, it is necessary to
It could be detected by sensitive electronic instrument；Infrared detection technology mainly measures workpiece surface Warm status, not can determine that in workpiece
The Warm status in portion, it is expensive compared with other detecting instruments or routine monitoring equipment.
The content of the invention
It is a primary object of the present invention to overcome the shortcomings of above-mentioned existing workpiece, defect detection technique, there is provided one kind detection essence
Spend the side that magneto-optic imaging non-destructive detects under high, reliable, easy to use, free of contamination constant and low-frequency alternating electromagnet excitation
Method.
To reach above-mentioned purpose, the present invention proposes a kind of magneto-optic imaging non-destructive detection means, and it is used to carry out to workpiece
Non-Destructive Testing, described device include：Direct current electrical interface, exchange electrical interface, controller, magnetic field generator, magneto-optic imaging sensor
And computer；The magnetic field generator is electrically connected to direct current electrical interface by the controller and exchanges electrical interface；Direct current connects
Mouthful, it accesses direct current to magnetic field generator；Electrical interface is exchanged, it gives magnetic field generator incoming transport electricity；Magnetic field generator, its
The workpiece excitation is given according to the control signal of controller；Magneto-optic imaging sensor, it gathers the magneto optic images of workpiece and transmission
To the computer.
Preferably, the direct current electrical interface provides voltage swing adjustable direct current for the magnetic field generator, makes magnetic field
Generator produces the different stationary magnetic field of magnitude of field intensity.
Preferably, the exchange electrical interface will provide voltage swing to the magnetic field generator and frequency is adjustable exchanges
Electricity, electromagnet pole is set to produce frequency and magnetic field size adjustable alternating magnetic field simultaneously.
Preferably, the magnetic field generator produces adjustable stationary magnetic field and low-frequency alternating under the control of the controller
Magnetic field, to obtain stray field in fault location.
Preferably, the magneto-optic imaging sensor produces magneto-optic effect in the presence of the stray field, is imaged magneto-optic
Polarised light in sensor contains workpiece, defect Magnetic Field by producing the different anglecs of rotation during magneto-optic sensor information
Light after polarization spectroscope reflects by the magneto-optic imaging sensor charge coupling device receive and to Distribution of Magnetic Field shape
State real time imagery, generate the magneto optic images of workpiece, defect.
Preferably, it also includes neck, and the neck is used for the position for limiting magnetic field generator so that it is between workpiece
Keep an adjustable gap.
Preferably, the computer receives the magneto optic images for the workpiece, defect that the magneto-optic imaging sensor obtains, and root
Contrast processing is carried out according to the model to be prestored in the magneto optic images and computer, realizes the automatic Classification and Identification to workpiece, defect.
Compared with existing magneto-optic image defects detection technique, the technical solution adopted by the present invention has following beneficial effects：
1) present invention uses DC electromagnet and low-frequency alternating electromagnet technology, and excitation unit does not need large volume coil,
Detection means can be realized integrated, possess small volume, the advantage of light weight.
2) magnetic field generator can produce stationary magnetic field, and induce distorted magnetic field in measured workpiece fault location, can make
Defect information can be intuitively from the magneto optic images in detection process.Workpiece, defect is generated by magneto-optic imaging sensor simultaneously
Image, computer control realize workpiece, defect image recognition and the calculating of workpiece, defect position.
3) magnetic field generator can produce low frequency alternating magnetic field, and induce distorted magnetic field in measured workpiece fault location.No
Under same excitation frequency, magneto-optical sensor can collect the stray field point of defect under different magnetic induction intensity under a cycle
Cloth situation.It can be believed by the contrast of different the magneto optic images with clearer shape, size, distributing position for obtaining defect etc.
Breath.
4) this method can realize the Non-contact nondestructive detection of metal works workpiece, defect, and not only accuracy of detection is high, Er Qieyun
Row is safe and reliable, easy to use, pollution-free.Due to the cooperation of excitation unit, magneto-optic imaging sensor can obtain clearer lack
Fall into information so that computer control can obtain the tiny flaw situation of detected position workpiece, and imaging is clearer, automatically
Change degree is high, and detection speed is fast.
5) gap that this method is realized by neck between workpiece and magnetic pole is adjustable.Due to stationary magnetic field and alternating magnetic field pair
The clearance requirement of workpiece and magnetic pole is different, and the present apparatus has added neck, and the magnetic pole of electromagnet is movable, can adjust magnetic pole and obtain
Specified gap, then with neck fixed magnetic pole, so as to obtain good Detection results.
Brief description of the drawings
Fig. 1 is the equipment bay structure distribution figure of the present invention；
Fig. 2 is the equipment interface distribution map of the present invention；
Fig. 3 is the equipment bay structure distribution structured flowchart of the present invention；
Fig. 4 is the equipment interface distributed architecture block diagram of the present invention；
Fig. 5 is the outward appearance block diagram of the present invention；
Fig. 6 is the outside drawing of the present invention；
Fig. 7 is the job control figure of the present invention.
Each numbering implication in figure：1- handles, 2- output data interfaces, 3- control unit interfaces, 4- direct current electrical interfaces, 5- exchanges
Electrical interface, 6- necks, 7- wheels, 8- magnetic poles, 9- magneto-optical sensors.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The present invention has used Faraday magnetooptical effect principle：When a branch of polarised light passes through medium, if in beam propagation side
To in the presence of an external magnetic field, then this polarised light will be deflected by plane of polarization, and deflection angle depends on magnetic field intensity.
The present invention applies magneto-optic imaging technique, and electromagnet is encouraged with constant current or alternating current by magnetic field generator
Magnetic field is induced on workpiece, and being distributed at workpiece, defect for magnetic field will be distorted, and cause the vertical magnetic field at this
Component changes, and correspondingly changes induced field.Magneto-optic imaging sensor produces magneto-optic effect in the presence of the magnetic field, makes
Polarised light in magneto-optic imaging sensor contains workpiece, defect by producing the different anglecs of rotation during magneto-optic sensor information
Magnetic Field light after polarization spectroscope reflects by charge coupling device receive and real time imagery.
As illustrated, the present invention is a kind of workpiece, defect magneto-optic imaging nondestructive inspection method, including electromagnet and magneto-optic into
As sensor.Magneto-optic imaging under stationary magnetic field excitation and low frequency alternating magnetic field excitation can be carried out and realize Non-Destructive Testing.Sensor
Workpiece is placed in lower section, and send instruction startup magnetic field generator by computer control produces magnetic field at workpiece.The magneto-optic
Imaging sensor major part includes LASER Light Source, the polarizer, cmos sensor, analyzer and magneto-optic chip.Magneto-optic imaging passes
Sensor belongs to non-contact measurement, is imaged directly perceived, good reliability, measurement accuracy is high, the low in energy consumption and rate of information throughput is high.
In the top of workpiece surface while magneto-optic imaging sensor works, by the workpiece for accurately controlling magnetic field generator workpiece
Defect nearby produces induced field, and because workpiece, defect is present, induced field has its special change near weld seam.Work as polarization
Parallel light rotates a certain angle after being reflected by induced field, then by analyzer can pointedly realize it is postrotational partially
Shake light by or cut-off, is finally obtained and is imaged by cmos camera, the image of gained is to contain workpiece, defect information
The magneto optic images.
The work of whole workpiece, defect magneto-optic imaging non-destructive is controlled by computer control system.Controller first
Control magnetic field generator goes out to produce the stationary magnetic field either low frequency alternating magnetic field of prescribed level in magnetic pole, concurrently sets magneto-optic biography
The sample frequency of sensor, synchronous coordination magneto-optic imaging sensor collection workpiece the magneto optic images, and the magneto optic images of acquisition are inputted
To computer control.Then workpiece, defect image is handled by corresponding image recognition algorithm, obtains workpiece, defect
Type and position, realize the real-time detection of workpiece, defect.Workpiece can be detected with hand-held handle, can also computer control setting
Movement velocity realizes automatic detection.Significantly improve the real-time of system and the automaticity of observation and control technology.Used control
System processed can correct measurement error automatically, improve the accuracy of detection of workpiece, defect.
The operation principle of system：During with the present apparatus and method measurement workpiece, defect, the present apparatus is placed on workpiece and caused
Magneto-optic imaging sensor chip aligns workpiece surface.Computer control control magnetic field generator produces magnetic field, synchronous coordination magnetic
Photoimaging sensor gathers the magneto optic images of workpiece, defect, and workpiece, defect the magneto optic images are delivered into computer control, by
Computer control realizes that the image procossing of workpiece, defect, workpiece, defect position calculate and defect type of workpiece identifies.Sensor
Show the information such as the workpiece, defect image detected in real time, classification, size.Because computer control arithmetic speed is fast and image
The development for the treatment of technology, it is possible to achieve the real-time detection of workpiece, defect.
In the case where not departing from spiritual or necessary characteristic of the invention, the present invention can be embodied in other specific forms.Should
The specific embodiment each side is considered merely as illustrative and non-limiting.Therefore, scope of the invention such as appended claims
It is shown in scope rather than shown as indicated above.It is all fall change in the equivalent meaning and scope of claim should be regarded as
Fall in the category of claim.
Claims (7)
1. a kind of magneto-optic imaging non-destructive detection means, it is used to carry out Non-Destructive Testing to workpiece, it is characterised in that described device bag
Include：
Direct current electrical interface, exchange electrical interface, controller, magnetic field generator, magneto-optic imaging sensor and computer；
The magnetic field generator is electrically connected to direct current electrical interface by the controller and exchanges electrical interface；
Direct current electrical interface, it accesses direct current to magnetic field generator；
Electrical interface is exchanged, it gives magnetic field generator incoming transport electricity；
Magnetic field generator, it gives the workpiece excitation according to the control signal of controller；
Magneto-optic imaging sensor, it gathers the magneto optic images of workpiece and is sent to the computer.
2. magneto-optic imaging non-destructive detection means according to claim 1, it is characterised in that
The direct current electrical interface provides voltage swing adjustable direct current for the magnetic field generator, magnetic field generator is produced magnetic
Field intensity stationary magnetic field of different sizes.
3. magneto-optic imaging non-destructive detection means according to claim 1, it is characterised in that
The exchange electrical interface will provide voltage swing and frequency adjustable alternating current to the magnetic field generator, make electromagnetism ferromagnetic
Pole produces frequency and magnetic field size adjustable alternating magnetic field simultaneously.
4. magneto-optic imaging non-destructive detection means according to claim 1, it is characterised in that
The magnetic field generator produces adjustable stationary magnetic field and low frequency alternating magnetic field under the control of the controller, to lack
Fall into place and obtain stray field.
5. magneto-optic imaging non-destructive detection means according to claim 4, it is characterised in that
The magneto-optic imaging sensor produces magneto-optic effect in the presence of the stray field, makes inclined in magneto-optic imaging sensor
Light shake by producing the different anglecs of rotation during magneto-optic sensor information, contains the light of workpiece, defect Magnetic Field through polarization
Received and to magnetic field distribution real time imagery by the charge coupling device of the magneto-optic imaging sensor after dichroic mirror, it is raw
Into the magneto optic images of workpiece, defect.
6. the magneto-optic imaging non-destructive detection means according to one of claim 1-5, it is characterised in that
It also includes neck, and the neck is used for the position for limiting magnetic field generator so that it keeps one adjustable between workpiece
The gap of section.
7. magneto-optic imaging non-destructive detection means according to claim 1, it is characterised in that
The computer receives the magneto optic images for the workpiece, defect that the magneto-optic imaging sensor obtains, and according to the magneto-optic figure
As carrying out contrast processing with the model to be prestored in computer, the automatic Classification and Identification to workpiece, defect is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720116203.6U CN206772898U (en) | 2017-02-08 | 2017-02-08 | A kind of magneto-optic imaging non-destructive detection means |
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| CN201720116203.6U CN206772898U (en) | 2017-02-08 | 2017-02-08 | A kind of magneto-optic imaging non-destructive detection means |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770628A (en) * | 2017-02-08 | 2017-05-31 | 广东工业大学 | A kind of magneto-optic imaging non-destructive detection means |
| RU2753839C1 (en) * | 2021-01-11 | 2021-08-24 | Федеральное государственное автономное образовательное учреждение высшего образования "Крымский федеральный университет имени В.И. Вернадского" | Device for magneto-optical visualization of defects in electrically conductive materials and their automatic fixation |
-
2017
- 2017-02-08 CN CN201720116203.6U patent/CN206772898U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770628A (en) * | 2017-02-08 | 2017-05-31 | 广东工业大学 | A kind of magneto-optic imaging non-destructive detection means |
| RU2753839C1 (en) * | 2021-01-11 | 2021-08-24 | Федеральное государственное автономное образовательное учреждение высшего образования "Крымский федеральный университет имени В.И. Вернадского" | Device for magneto-optical visualization of defects in electrically conductive materials and their automatic fixation |
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Granted publication date: 20171219 Termination date: 20200208 |