CN105823763B - Fluorescence intensity measurement method for automatic magnetic powder inspection - Google Patents
Fluorescence intensity measurement method for automatic magnetic powder inspection Download PDFInfo
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Abstract
The invention discloses a kind of fluorescence intensity measurement methods for automatic magnetic powder inspection.The method of the present invention includes steps 1, acquire the fluorescent image of measured workpiece；Step 2, it according to fluorescent image, calculates and demarcates the sampled value of picture pick-up device and the linear function slope of fluorescence intensity level；Step 3, fluorescence intensity is calculated using linear function slope.The present invention can the defect fluorescent image automatically to workpiece calculate, to obtain accurate fluorescence intensity, avoid human error.
Description
Technical field
The present invention relates to fluorescence intensity measurement methods, more specifically to the fluorescence intensity for automatic magnetic powder inspection
Measurement method.
Background technique
Magnetic powder inspection using magnetic flux leakage and magnetic powder at workpiece, defect interaction, it be utilized steel product surface and
The difference of near surface flaw (such as crackle, slag inclusion, hairline etc.) magnetic conductivity and steel magnetic conductivity, after magnetization at these material discontinuities
Magnetic field will occur distortion, form workpiece surface at the flux leakage of part and produce magnetic flux leakage, so that magnetic powder be attracted to form defect
The magnetism powder accumulation at place-magnetic trace shows defective locations and shape under illumination condition appropriate, adds to the accumulation of these magnetic powders
To observe and explain, it is achieved that magnetic powder inspection.
The advantages of magnetic powder inspection is: inspection the defects of to steel material or workpiece surface crackle is highly effective；Equipment and
Operation is relatively simple；Examine speed fast, convenient for detecting a flaw at the scene to large scale equipment and workpiece；Expenses of laboratory examination is relatively low.It lacks
Point is: being only applicable to ferrimagnet；It is only capable of showing the length and shape of defect, and is difficult to determine its depth；There is shadow to remanent magnetism
Loud some workpiece also need to demagnetize and clean after magnetic powder inspection.
In wet process fluorescent magnetic particle flaw detection, according to working specification, the ultraviolet light irradiation magnetic using certain brightness is usually required that
Then the workpiece of suspension coating detects fluorescence to determine workpiece, defect.In the process, the intensity of ultraviolet light, in other words its institute
The fluorescence intensity ejected directly affects the effect of defects detection.But in actual operation, often lack online detection
Means rely primarily on artificial experience to judge.Unmanned due to pursuing, this problem is especially prominent in Automatic Magnetic Particle Inspecting System
Out.
For this problem, the present invention is starting detection defects using the industrial CCD camera in Automatic Magnetic Particle Inspecting System
During identification, by the method for industrial CCD camera digital collection and software calculating, on-line measurement practical work piece fluorescence is strong
Degree can provide compensation reference and warning note for automatic magnetic powder inspection.
Summary of the invention
For the means existing in the prior art for lacking on-line checking fluorescence intensity, artificial experience judgement is relied primarily on
Problem, the object of the present invention is to provide the fluorescence intensity measurement methods for automatic magnetic powder inspection.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of fluorescence intensity measurement device for automatic magnetic powder inspection, including ultraviolet source, picture pick-up device, computer,
Fluorescent brightness meter, Calibration Piece for Sensitivity.Ultraviolet source is irradiated measured workpiece, and picture pick-up device shoots the fluorogram of measured workpiece
Picture, and fluorescent image is transmitted to computer.Calibration Piece for Sensitivity is placed on measured workpiece, and including a cross mark, glimmering
The fluorescence intensity of the cross mark of luminometer detection sensitivity test piece.
An embodiment according to the present invention, picture pick-up device are industrial CCD camera.
To achieve the above object, the present invention also adopts the following technical scheme that
A kind of fluorescence intensity measurement method for automatic magnetic powder inspection, comprising the following steps: step 1, acquire tested work
The fluorescent image of part；Step 2, according to fluorescent image, calculate and demarcate picture pick-up device sampled value and fluorescence intensity level it is linear
Function slope；Step 3, fluorescence intensity is calculated using linear function slope.
An embodiment according to the present invention, step 2 calculate operating condition least concentration magnetic flaw detection ink the following steps are included: step 2.1
When cross mark brightness and fluorescence intensity；Step 2.2, the brightness of cross mark and glimmering when calculating nominal situation concentration magnetic flaw detection ink
Luminous intensity；Step 2.3, linear function slope is calculated.
An embodiment according to the present invention, step 2.1 configure operating condition least concentration magnetcisuspension the following steps are included: step A1
Liquid；Step B1 takes A type Calibration Piece for Sensitivity to be placed on workpiece；Step C1, magnetic flaw detection ink is coated on A type Calibration Piece for Sensitivity；Step
Rapid D1 magnetizes workpiece, ultraviolet source irradiation workpiece；Step E1, computer pass through the collected cross mark brightness of picture pick-up device
It is recorded as Vx0；The fluorescence intensity of step F1, the cross mark that fluorescent brightness measures are recorded as Vy0。
An embodiment according to the present invention, step 2.2 configure nominal situation concentration magnetcisuspension the following steps are included: step G1
Liquid；Step H1 takes A type Calibration Piece for Sensitivity to be placed on workpiece；Step I1, magnetic flaw detection ink is coated on A type Calibration Piece for Sensitivity；Step
Rapid J1 magnetizes workpiece, ultraviolet source irradiation workpiece；Step K1, computer pass through the collected cross mark brightness of picture pick-up device
It is recorded as Vx1；The fluorescence intensity of step L1, the cross mark that fluorescent brightness measures are recorded as Vy1。
An embodiment according to the present invention, step 2.3 is the following steps are included: linear function slope
An embodiment according to the present invention, step 3 retain the following steps are included: step 3.1, brightness and uniformity screening
Fluorescence is full, uniform image；Step 3.2, fluorescence intensity level is calculated according to the image and linear function slope that retain.
An embodiment according to the present invention, step 3.1 cut image the following steps are included: step A2, leave behind magnetic powder spy
Hurt X × Y pixel in detection window；Step B2, with 3 × 3 neighborhoods to image median filter, removal interference；Step C2, uses gradient
Edge detection extracts workpiece, defect image；Step D2 calculates defect image pixel intensity mean value Vavg, as present image fluorescence
Brightness value Vx1；Step E2, brightness screening give up average brightness lower than threshold value VsImage, leave the full image of fluorescence；Step
F2, uniformity screening give up unevenness higher than threshold value NsImage, leave the uniform image of fluorescence；Defect image is uneven
Spend calculation method are as follows:Wherein, N is image unevenness, VavgFor mean picture brightness, C
For image pixel quantity, ViFor pixel intensity in image.
An embodiment according to the present invention, step 3.2 is the following steps are included: step G2, former fluorescent brightness value Vx2With it is current
Image fluorescent brightness value VxWeighted filtering obtains existing fluorescent brightness value Vx；Vx=α Vx1+(1-α)Vx2, wherein α is filter factor, is taken
Value is 0~1；Step H2 uses existing fluorescent brightness according to the linear functional relation of the sampled value of picture pick-up device and fluorescence intensity level
Value VxFluorescence intensity level V can be calculatedy；Vy=Vy0+β(Vx-Vx0)。
In the above-mentioned technical solutions, the fluorescence intensity measurement method for automatic magnetic powder inspection of the invention can be automatic right
The defect fluorescent image of workpiece is calculated, to obtain accurate fluorescence intensity, avoids human error.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the present invention for the fluorescence intensity measurement device of automatic magnetic powder inspection；
Fig. 2 is flow chart of the present invention for the fluorescence intensity measurement method of automatic magnetic powder inspection；
Fig. 3 is each sub-steps flow chart that fluorescence intensity is calculated in Fig. 2.
Specific embodiment
Technical solution of the present invention is further illustrated with reference to the accompanying drawings and examples.
Referring to Fig.1, the present invention discloses a kind of fluorescence intensity measurement device for automatic magnetic powder inspection first, mainly wraps
Include ultraviolet source 1, picture pick-up device 3, computer 4, fluorescent brightness meter 5, Calibration Piece for Sensitivity (being not shown).Of the invention takes the photograph
Picture equipment 3 is not limited thereto using picture pick-up device as industrial CCD camera.
As shown in Figure 1, picture pick-up device 3 shoots the fluorescence of measured workpiece 2 when ultraviolet source 1 is irradiated measured workpiece 2
Image, and fluorescent image is transmitted to computer 4.Calibration Piece for Sensitivity is placed on measured workpiece 2, and including a cross trace
Mark, the fluorescence intensity of the cross mark of 5 detection sensitivity test piece of fluorescent brightness meter.
Using above equipment, another emphasis of the invention is to disclose a kind of fluorescence intensity survey for automatic magnetic powder inspection
Amount method is mainly made of 3 steps referring to Fig. 2, and focus on the calibration of step S2 and step S3 and measure this two
A step.
Step S1 acquires the fluorescent image of measured workpiece.
Step S2 is calculated according to fluorescent image and is demarcated the sampled value of picture pick-up device and the linear function of fluorescence intensity level
Slope.
Step S3 calculates fluorescence intensity using linear function slope.
As shown in Fig. 2, step S2 the following steps are included:
Step S2.1, the brightness and fluorescence intensity of cross mark when calculating operating condition least concentration magnetic flaw detection ink, by below
A series of sub-steps are realized:
Step A1 configures operating condition least concentration magnetic flaw detection ink.
Step B1 takes A type Calibration Piece for Sensitivity to be placed on workpiece.
Step C1, magnetic flaw detection ink is coated on A type Calibration Piece for Sensitivity.
Step D1 magnetizes workpiece, ultraviolet source irradiation workpiece.
Step E1, computer are recorded as V by the collected cross mark brightness of picture pick-up devicex0。
The fluorescence intensity of step F1, the cross mark that fluorescent brightness measures are recorded as Vy0。
Step S2.2, the brightness and fluorescence intensity of cross mark when calculating nominal situation concentration magnetic flaw detection ink, by below
A series of sub-steps are realized:
Step G1 configures nominal situation concentration magnetic flaw detection ink.
Step H1 takes A type Calibration Piece for Sensitivity to be placed on workpiece.
Step I1, magnetic flaw detection ink is coated on A type Calibration Piece for Sensitivity.
Step J1 magnetizes workpiece, ultraviolet source irradiation workpiece.
Step K1, computer are recorded as V by the collected cross mark brightness of picture pick-up devicex1。
The fluorescence intensity of step L1, the cross mark that fluorescent brightness measures are recorded as Vy1。
Step S2.3 calculates linear function slope
The final effect of step S2 is that linear function slope is calculated, to use for step S3.
Further, referring to Fig. 3, step S3 the following steps are included:
Step S3.1, brightness and uniformity screening, retain that fluorescence is full, uniform image, by a series of sons below
Step is realized:
Step A2 cuts image, leaves behind X × Y pixel in magnetic powder inspection detection window.
Step B2, with 3 × 3 neighborhoods to image median filter, removal interference.
Step C2 uses gradient edge Detection and Extraction workpiece, defect image.
Step D2 calculates defect image pixel intensity mean value Vavg, as present image fluorescent brightness value Vx1。
Step E2, brightness screening give up average brightness lower than threshold value Vs(VsValue can be with Vx0) identical image, it stays
The full image of lower fluorescence.
Step F2, uniformity screening give up unevenness higher than threshold value NsImage, leave the uniform image of fluorescence.Ns's
Value refers to the actual conditions of detection defects, can take 0.1 or so.
Defect image unevenness calculation method are as follows:
Wherein, N is image unevenness, VavgFor mean picture brightness, C is image pixel quantity, ViFor pixel in image
Brightness.
Step S3.2 calculates fluorescence intensity level according to the image and linear function slope that retain, by a system below
Column sub-steps is realized:
Step G2, former fluorescent brightness value Vx2With present image fluorescent brightness value VxWeighted filtering obtains existing fluorescent brightness value
Vx, it may be assumed that
Vx=α Vx1+(1-α)Vx2, wherein α is filter factor, and value is 0~1, can value in the case where stable conditions
0.1。
Step H2 uses existing fluorescent brightness according to the linear functional relation of the sampled value of picture pick-up device and fluorescence intensity level
Value VxFluorescence intensity level V can be calculatedy, it may be assumed that
Vy=Vy0+β(Vx-Vx0)。
Illustrate the effect of above-mentioned technical proposal below by a specific example.
Under a specific operating condition, calibration is comprised the following steps:
A1: the magnetic flaw detection ink of configuration operating condition lower limit 0.5g/L.
B1: A type Calibration Piece for Sensitivity is taken to be placed on workpiece.
C1: magnetic flaw detection ink is coated on A type Calibration Piece for Sensitivity.
D1: magnetization workpiece, ultraviolet source irradiation workpiece.
E1: computer is recorded as V by the collected cross mark brightness of industrial CCD camerax0=83.
F1: the fluorescence intensity for the cross mark that fluorescent brightness measures is recorded as Vy0=105cd/m2。
G1: configuration nominal situation 1g/L magnetic flaw detection ink.
H1: A type Calibration Piece for Sensitivity is taken to be placed on workpiece.
I1: magnetic flaw detection ink is coated on A type Calibration Piece for Sensitivity.
J1: magnetization workpiece, ultraviolet source irradiation workpiece.
K1: computer is recorded as V by the collected cross mark brightness of industrial CCD camerax1=127.
L1: the fluorescence intensity for the cross mark that fluorescent brightness measures is recorded as Vy1=164cd/m2。
M1: the linear function slope β of CCD camera sampled value and fluorescence intensity level is calculated.
The process for calculating fluorescence intensity, comprises the following steps:
A2: image is cut, M × N pixel in magnetic powder inspection detection window is left behind.
B2: with 3 × 3 neighborhoods to image median filter, place to go interference.
C2: gradient edge Detection and Extraction workpiece, defect image is used.
D2: assuming that defect image pixel intensity mean value Vavg=100.0, as present image fluorescent brightness value Vx1=
100.0。
E2: brightness screening, due to Vx1Greater than threshold values Vs=83, which confirms the validity.
F2: uniformity screening, it is assumed that defect image unevenness N=0.03 is lower than threshold value Ns=0.1, the defect image
It confirms the validity.
G2: former fluorescent brightness value Vx2=106.0 and present image fluorescent brightness value Vx=100.0 weighted filterings obtain fluorescence
Brightness value Vx。
Vx=α Vx1+(1-α)Vx2=0.1 × 100+0.9 × 106=105.4
Wherein α is filter factor, value 0.1.
H2: according to the linear functional relation of CCD camera sampled value and fluorescence intensity level, existing fluorescent brightness value V is usedxIt can be with
Fluorescence intensity level V is calculatedy。
Vy=Vy0+β(Vx-Vx0)=105+1.34 (105.4-83)=135.0 (cd/m2)
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention,
And be not used as limitation of the invention, as long as the change in spirit of the invention, to embodiment described above
Change, modification will all be fallen within the scope of claims of the present invention.
Claims (1)
1. a kind of fluorescence intensity measurement method for automatic magnetic powder inspection, which comprises the following steps:
Step 1, the fluorescent image of measured workpiece is acquired；
Step 2, according to the fluorescent image, calculate and demarcate picture pick-up device sampled value and fluorescence intensity level linear function it is oblique
Rate；The step 2 the following steps are included:
Step 2.1, the brightness and fluorescence intensity of cross mark when calculating operating condition least concentration magnetic flaw detection ink；The step 2.1 includes
Following steps:
Step A1 configures operating condition least concentration magnetic flaw detection ink；
Step B1 takes A type Calibration Piece for Sensitivity to be placed on workpiece；
Step C1, magnetic flaw detection ink is coated on A type Calibration Piece for Sensitivity；
Step D1 magnetizes workpiece, ultraviolet source irradiation workpiece；
Step E1, computer are recorded as V by the collected cross mark brightness of picture pick-up devicex0；
The fluorescence intensity of step F1, the cross mark that fluorescent brightness measures are recorded as Vy0；
Step 2.2, the brightness and fluorescence intensity of cross mark when calculating nominal situation concentration magnetic flaw detection ink；The step 2.2 includes
Following steps:
Step G1 configures nominal situation concentration magnetic flaw detection ink；
Step H1 takes A type Calibration Piece for Sensitivity to be placed on workpiece；
Step I1, magnetic flaw detection ink is coated on A type Calibration Piece for Sensitivity；
Step J1 magnetizes workpiece, ultraviolet source irradiation workpiece；
Step K1, computer are recorded as V by the collected cross mark brightness of picture pick-up devicex1；
The fluorescence intensity of step L1, the cross mark that fluorescent brightness measures are recorded as Vy1；
Step 2.3, linear function slope is calculated；
That is, linear function slope
Step 3, fluorescence intensity is calculated using the linear function slope；The step 3 the following steps are included:
Step 3.1, brightness and uniformity screening, retain that fluorescence is full, uniform image；The step 3.1 the following steps are included:
Step A2 cuts image, leaves behind X × Y pixel in magnetic powder inspection detection window；
Step B2, with 3 × 3 neighborhoods to image median filter, removal interference；
Step C2 uses gradient edge Detection and Extraction workpiece, defect image；
Step D2 calculates defect image pixel intensity mean value Vavg, as present image fluorescent brightness value Vx1；
Step E2, brightness screening give up average brightness lower than threshold value VsImage, leave the full image of fluorescence；
Step F2, uniformity screening give up unevenness higher than threshold value NsImage, leave the uniform image of fluorescence, NsValue
It is 0.1；
Defect image unevenness calculation method are as follows:
Wherein, N is image unevenness, VavgFor mean picture brightness, C is image pixel quantity, ViFor pixel intensity in image；
Step 3.2, fluorescence intensity level is calculated according to the image and linear function slope that retain；The step 3.2 includes following
Step:
Step G2, former fluorescent brightness value Vx2With present image fluorescent brightness value VxWeighted filtering obtains existing fluorescent brightness value Vx；
Vx=α Vx1+(1-a)Vx2, wherein α is filter factor, and value is 0~1；
Step H2 uses existing fluorescent brightness value V according to the linear functional relation of the sampled value of picture pick-up device and fluorescence intensity levelxMeter
Calculation obtains fluorescence intensity level Vy；
That is, Vy=Vy0+β(Vx-Vx0)。
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| CN108414614A (en) * | 2018-01-15 | 2018-08-17 | 上海航天精密机械研究所 | Fluorescentmagnetic particle(powder) automatic flaw detection sense colors image pre-processing method |
| CN109191439A (en) * | 2018-08-20 | 2019-01-11 | 宁波市智能制造产业研究院 | A kind of target workpiece surface knife mark defect inspection method |
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| CN102884417A (en) * | 2010-05-07 | 2013-01-16 | 美哥特株式会社 | Method and apparatus for measuring the concentration of component in inspection liquid used for wet-type fluorescent magnetic particle testing |
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