CN109883344A - A kind of detection method of marine anticorrosion coating surface strain and displacement - Google Patents
A kind of detection method of marine anticorrosion coating surface strain and displacement Download PDFInfo
- Publication number
- CN109883344A CN109883344A CN201910038837.8A CN201910038837A CN109883344A CN 109883344 A CN109883344 A CN 109883344A CN 201910038837 A CN201910038837 A CN 201910038837A CN 109883344 A CN109883344 A CN 109883344A
- Authority
- CN
- China
- Prior art keywords
- measured
- displacement
- coating surface
- cameras
- corrosion
- 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
Abstract
The present invention relates to a kind of detection methods of marine anticorrosion coating surface strain and displacement, comprising the following steps: test specimen surface markers speckle particle to be measured is placed in seawater corrosion device；Two industrial imaging devices are arranged in component Normal plane；Start corrosion device, and opens industrial imaging device and the digital speckle image of coating surface is acquired；Using collected digital picture as input data, relevant matches calculating is carried out, seawater corrosion is obtained and acts on the quantitative deformation data that lower coating is imaged in two cameras；Scaling board is placed in a device, imaging system is demarcated, and obtains the three-dimensional appearance and accurate deformation information of coating surface deformation based on two magazine deformation datas.The detection method precision of marine anticorrosion coating surface strain provided by the invention and displacement is higher, save the cost；It can get the deformation information that corrosion-inhibiting coating is generated due to corrosion under marine environment using the method for the present invention, provide accurate reliable data for the mechanical property research of marine anticorrosion coating.
Description
Technical field:
The present invention relates to engineering detecting field, the especially a kind of marine anticorrosion coating surface that the whole audience is contactless strain with
The detection method of displacement.
Background technique:
Seawater is a kind of strong electrolyte that saliferous rate is about 3%, thus is served in engineering structure surface therein and usually needs
Corrosion-inhibiting coating is coated to resist the corrosion failure of seawater.But as active time increases, corrosion-inhibiting coating surface can be due to seawater
Constantly corrode and gradually deform and fall off, eventually lead to its internal structure is destroyed by fast erosion, or even thus causes serious peace
Full accident.Therefore, the ocean engineering detection field that is deformed into for precisely and easily detecting corrosion-inhibiting coating under marine environment needs
The critical issue of solution.
Currently, the method for the strain of marine anticorrosion coating surface and displacement detecting is mainly resistance strain measurement technology (abbreviation
For electrical measuring method).Electrical measuring method by measuring surface deformation in component surface adhering resistance strain sheets, when structure under external force
Foil gauge can deform therewith when deforming, and the resistance of foil gauge changes immediately, and resistance variations are converted by measuring bridge
Voltage signal finally exports strain value through enhanced processing and analog-to-digital conversion.However, using electrical measuring method Measuring Oceanic corrosion-inhibiting coating
Strain there is following limitation: 1) traditional strain measurement method describes whole audience strain by limited discrete measurement point, no
The full-field distribution of stress-strain can accurately be obtained；2) engineering structure of operation on the sea is different, stress condition is complicated, based on discrete
The traditional measurement method of point strain measurement is difficult the position for predicting that unknown stress collection neutralizes large strain gradient；3) marine environment
Complicated and changeable, the temperature stability of electrical measuring method is very poor, and measurement accuracy not can guarantee；4) the offshore engineering structure scale of construction is usually very big,
Realize that full field deformation measure needs to paste a large amount of foil gauge, it is cumbersome, it is not easy to implement；5) under marine environment, strain
Piece be difficult to be bonded or be bonded it is insecure, be easy to cause loss of data or measured experimental data inaccuracy.
Summary of the invention:
In view of the limitation of above-mentioned technology, the object of the present invention is to provide a kind of simple, accurately contactless ocean is anti-
The detection method of rotten coating surface strain and displacement.
To achieve the above object, the invention adopts the following technical scheme: a kind of strain of marine anticorrosion coating surface and displacement
Detection method, step includes step 1: applying artificial speckle label in surface of test piece to be measured in advance: first to test specimen to be measured
The dumb light paint that surface sprays black is used as background, is then in granular form with white dumb light paint and is sprayed on surface of test piece to be measured,
And make distribution of particles that there is randomness as much as possible, coupon level to be measured is fixed in seawater corrosion device；Step 2: to
Disposed at equal distance or so two industrial digital cameras right above test block, two cameras are identical as test specimen angulation to be measured, and two
The optical axis of camera intersects at test specimen center to be measured, by adjusting the aperture and focal length of camera, it is ensured that the speckle of surface of test piece to be measured
Pattern imaging clearly, and it is as big as possible be covered with whole image, and two cameras are connect with image collecting device；Step 3:
Start digital image acquisition apparatus first, the coating surface digital picture before corrosiveness occurs is acquired, and restarts sea
Aqueous corrosion device, and the digital picture on corrosion process floating coat surface is recorded until coating failure；Step 4: it is based on left and right two-phase
The collected digital picture of machine establishes whole audience displacement and strain information that digital image correlation technique analyzes test specimen to be measured respectively；
Step 5: by the scaling board of known spatial coordinate, the imaging system of two-phase machine composition is demarcated, based on test specimen in left and right
Two magazine whole audience displacement informations rebuild the three-dimensional appearance of coating surface and obtain the accurate three-dimensional deformation information on its surface.This
Invention can quantitatively obtain whole audience strain and the displacement information of surface of test piece to be measured in the case where non-direct contact, overcome biography
The problem of system electric measuring method cannot directly carry out strain and displacement measurement to the structure being on active service in marine environment, so that coating surface
Displacement and strain measurement it is simpler convenient, can analyze by the tracking of real-time quantitative to coating surface 3 D deformation information
The safe service life of marine anticorrosion coating, effectively to avoid security risk.The present invention is applied widely, can not only measure
Engineering structure under marine environment is equally applicable to the engineering structure surface deformation measurement under other corrosivenesses, can be tied
The whole audience on structure surface is displaced and strain information, and precision and stability is higher, can accurately analyze and obtains whole audience any position
Deformation information, it is easier to the practical safe service life promoted for predicting corrosion-inhibiting coating.
In the step 4, it is based on the collected digital picture of left and right camera, acquired image is counted respectively
The analysis of word image correlation technique.The matching process of digital picture related algorithm is as follows:
A) two groups of digital speckle images before and after selective etching in the process, respectively as reference picture and target image；
B) deformation monitoring region is determined in a reference image；
C) sampled point is selected in monitoring region；
D) relevant calculation sub-district is determined, while corresponding position determines region of search in the target image；
E) it is based on following relevant matches criterion, carries out relevant matches calculating in image after deformation:
C (u, v)=∑ ∑ [g (x+u, y+v)-f (x, y)]2
Wherein, C is the related coefficient between two sub-districts, and the coefficient is smaller, illustrates that two sub-districts get over " as "；F (x, y) and
G (x+u, y+v) is respectively the gray value for deforming front and back curtain wall surface corresponding position, and (u, v) is displacement minute of this in the direction x, y
Amount；
F) the smallest position of related coefficient is the position of most probable appearance after the sampling point deformation, the position and initial position
Between coordinate difference be motion vector that this generates under corrosiveness；
G) step d)~f is repeated to sampled point all in monitoring region), the displacement letter of all sampled points can be obtained
Breath；
H) based on the displacement information of these sampled points, the whole field deformation information of entire surface of test piece to be measured is rebuild.
It in the step 5, is demarcated using the imaging system that scaling board forms two-phase machine, the mark of imaging system
Note method is as follows:
It treats any point on test block surface and establishes world coordinate system, wherein any point is expressed as (xw,yw,zw),
The coordinate that this is imaged in left and right camera is respectively (xl,yl)、(xr,yr), then the point on three-dimensional space is in camera plane
Imaging model can indicate are as follows:
Wherein, s is proportionality coefficient, and [R t] is the external system of imaging system, and R is world coordinate system to camera coordinates system
Spin matrix and translation vector, A be camera inner parameter.
By the scaling board of known spatial coordinate, coating is rebuild in the magazine whole audience displacement information in left and right two based on test specimen
The three-dimensional appearance on surface and the accurate three-dimensional deformation information for obtaining its surface.
Technical solution more than present invention use, has the advantage that 1) the present invention is based on the calculations of three-dimensional digital image correlation
Method calculates the whole audience strain and displacement on corrosion-inhibiting coating surface under the conditions of marine corrosion, realizes to corrosion-inhibiting coating surface any position
The quantitative detection of strain and displacement information, several limited accessible positions can only be answered by overcoming traditional deformation measurement method
Become the limitation with displacement measurement；2) present invention by take pictures to corrosion-inhibiting coating surface obtains digital picture, and indirect connects
It is a kind of contactless measurement side to the strain on corrosion-inhibiting coating surface and displacement monitoring in simulating ocean environment that touching, which can be completed,
Method；3) present invention combines digital image correlation technique to complete to detect the corrosion-deformation of marine anticorrosion coating surface, this method tool
Have that simple and convenient, precision and stability is higher, high resolution, applied widely, Practical significance are big, has actual promotional value
The advantages that.
Detailed description of the invention:
Fig. 1 is left and right camera schematic diagram
Fig. 2 is Experimental equipment of the invention.
Fig. 3 is speckle schematic diagram.
Fig. 4 is the coating true picture of left and right camera.
Fig. 5 is scaling board schematic diagram.
In Fig. 1:
1. 3. right 5. image collecting device of industrial camera of left industrial camera 4. of test specimen to be measured of seawater corrosion device 2.
Specific embodiment:
A specific embodiment of the invention is further described below in conjunction with attached drawing:
In conjunction with figure, the present invention including the following steps:
Step 1: apply artificial speckle label in surface of test piece to be measured in advance: spraying black to surface of test piece to be measured first
Dumb light paint be used as background, then paint to be in granular form with white dumb light and be sprayed on surface of test piece to be measured, and make as much as possible
Distribution of particles has randomness, and coupon level to be measured is fixed in seawater corrosion device；
Step 2: the industrial digital cameras of disposed at equal distance or so two right above test specimen to be measured, two cameras with it is to be tested
Part angulation is identical, and the optical axis of two cameras intersects at test specimen center to be measured, by adjusting the aperture and focal length of camera, it is ensured that
The speckle pattern imaging clearly of surface of test piece to be measured, and it is as big as possible be covered with whole image, and two cameras are adopted with image
Acquisition means connection；
Step 3: first starting digital image acquisition apparatus, to corrosiveness occur before coating surface digital picture into
Row acquisition, restarts seawater corrosion device, and records the digital picture on corrosion process floating coat surface until coating failure；
Step 4: based on left and right the collected digital picture of two cameras, establish digital image correlation technique analyze respectively to
The whole audience of test block is displaced and strain information；
Step 5: by the scaling board of known spatial coordinate, the imaging system of two-phase machine composition is demarcated, based on examination
Part rebuilds the three-dimensional appearance of coating surface in the magazine whole audience displacement information in left and right two and obtains the accurate three-dimensional change on its surface
Shape information.
In the step 4, it is based on the collected digital picture of left and right camera, number is carried out to acquired image respectively
Image correlation technique analysis.The matching process of digital picture related algorithm is as follows:
A) two groups of digital speckle images before and after selective etching in the process, respectively as reference picture and target image；
B) deformation monitoring region is determined in a reference image；
C) sampled point is selected in monitoring region；
D) relevant calculation sub-district is determined, while corresponding position determines region of search in the target image；
E) it is based on following relevant matches criterion, carries out relevant matches calculating in image after deformation:
C (u, v)=∑ ∑ [g (x+u, y+v)-f (x, y)]2
Wherein, C is the related coefficient between two sub-districts, and the coefficient is smaller, illustrates that two sub-districts get over " as "；F (x, y) and
G (x+u, y+v) is respectively the gray value for deforming front and back curtain wall surface corresponding position, and (u, v) is displacement minute of this in the direction x, y
Amount；
F) the smallest position of related coefficient is the position of most probable appearance after the sampling point deformation, the position and initial position
Between coordinate difference be motion vector that this generates under corrosiveness；
G) step d)~f is repeated to sampled point all in monitoring region), the displacement letter of all sampled points can be obtained
Breath；
Displacement information based on these sampled points rebuilds the whole field deformation information of entire surface of test piece to be measured.
It in the step 5, is demarcated using the imaging system that scaling board forms two-phase machine, the label of imaging system
Method is as follows:
It treats any point on test block surface and establishes world coordinate system, wherein any point is expressed as (xw,yw,zw),
The coordinate that this is imaged in left and right camera is respectively (xl,yl)、(xr,yr), then the point on three-dimensional space is in camera plane
Imaging model can indicate are as follows:
Wherein, s is proportionality coefficient, and [R t] is the external system of imaging system, and R is world coordinate system to camera coordinates system
Spin matrix and translation vector, A be camera inner parameter.
By the scaling board of known spatial coordinate, coating is rebuild in the magazine whole audience displacement information in left and right two based on test specimen
The three-dimensional appearance on surface and the accurate three-dimensional deformation information for obtaining its surface.
Fig. 2 illustrates Experimental equipment of the invention.First by surface of test piece even application black paint to be measured, then again
Random labelling white paint spot, forms random speckle pattern shown in Fig. 3.Then test specimen to be measured is fixed on seawater corrosion dress
In setting.An industrial camera is each side arranged right above test specimen to be measured, two cameras are identical as test specimen angulation to be measured,
And two cameras are connect with image collecting device.
Picture 5 illustrates scaling board pattern of the invention.The scaling board is replaced by 10 × 10 regular shade lattice blank cell
Composition.As shown, having filled black in the upper left corner of scaling board, the other three angle is blank marks, this four angles are used for phase
Machine identification and label.
Claims (1)
1. a kind of detection method of marine anticorrosion coating surface strain and displacement, it is characterised in that the following steps are included:
Step 1: apply artificial speckle label in surface of test piece to be measured in advance: first to the mute of surface of test piece to be measured spraying black
Then gloss oil paint is in granular form with white dumb light paint as background and is sprayed on surface of test piece to be measured, and make particle as much as possible
Distribution has randomness, and coupon level to be measured is fixed in seawater corrosion device；
Step 2: disposed at equal distance or so two industrial digital cameras, two cameras and test specimen institute to be measured right above test specimen to be measured
It is at an angle of identical, and the optical axis of two cameras intersects at test specimen center to be measured, by adjusting the aperture and focal length of camera, it is ensured that be measured
The speckle pattern imaging clearly of surface of test piece, and it is as big as possible be covered with whole image, and by two cameras and image collector
Set connection；
Step 3: starting digital image acquisition apparatus, the coating surface digital picture before corrosiveness occurs are adopted first
Collection, restarts seawater corrosion device, and records the digital picture on corrosion process floating coat surface until coating failure；
Step 4: based on left and right the collected digital picture of two cameras, establish digital image correlation technique analyze respectively it is to be tested
The whole audience of part is displaced and strain information；
Step 5: by the scaling board of known spatial coordinate, the imaging system of two-phase machine composition is demarcated, is existed based on test specimen
The magazine whole audience displacement information in left and right two rebuilds the three-dimensional appearance of coating surface and obtains the accurate three-dimensional deformation letter on its surface
Breath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910038837.8A CN109883344A (en) | 2019-01-16 | 2019-01-16 | A kind of detection method of marine anticorrosion coating surface strain and displacement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910038837.8A CN109883344A (en) | 2019-01-16 | 2019-01-16 | A kind of detection method of marine anticorrosion coating surface strain and displacement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109883344A true CN109883344A (en) | 2019-06-14 |
Family
ID=66926106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910038837.8A Pending CN109883344A (en) | 2019-01-16 | 2019-01-16 | A kind of detection method of marine anticorrosion coating surface strain and displacement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109883344A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110895217A (en) * | 2019-11-29 | 2020-03-20 | 昆明理工大学 | Method for making spots on surface of water-saturated rock test piece applied to digital speckle correlation method |
| CN111289395A (en) * | 2020-02-24 | 2020-06-16 | 天津商业大学 | Metal stress corrosion image testing method |
| CN112782010A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Anti-explosion coating test equipment and anti-explosion coating test method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4512659A (en) * | 1983-08-10 | 1985-04-23 | Tencor Instruments | Apparatus for calibrating a surface scanner |
| CN201096733Y (en) * | 2007-04-19 | 2008-08-06 | 华东理工大学 | A measuring device for coated layer high-temperature worm distortion |
| CN101346617A (en) * | 2005-12-27 | 2009-01-14 | 3M创新有限公司 | Detection system |
| CN103453839A (en) * | 2013-09-06 | 2013-12-18 | 鞍钢股份有限公司 | Method for measuring thickness of coating in confocal mode |
| CN104483330A (en) * | 2014-11-11 | 2015-04-01 | 浙江大学 | Concrete surface crack real-time monitoring system and cracking risk dynamic assessment method |
| CN106461373A (en) * | 2014-03-12 | 2017-02-22 | 晓温-威廉姆斯公司 | Real-time digitally enhanced imaging for the prediction, application, and inspection of coatings |
| CN108489413A (en) * | 2018-04-28 | 2018-09-04 | 华南理工大学 | A kind of concrete surface heterogeneous strain measuring system and method |
| CN109000578A (en) * | 2018-07-12 | 2018-12-14 | 上海海事大学 | A kind of building curtain wall wind pressure deformation monitoring method that the whole audience is contactless |
-
2019
- 2019-01-16 CN CN201910038837.8A patent/CN109883344A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4512659A (en) * | 1983-08-10 | 1985-04-23 | Tencor Instruments | Apparatus for calibrating a surface scanner |
| CN101346617A (en) * | 2005-12-27 | 2009-01-14 | 3M创新有限公司 | Detection system |
| CN201096733Y (en) * | 2007-04-19 | 2008-08-06 | 华东理工大学 | A measuring device for coated layer high-temperature worm distortion |
| CN103453839A (en) * | 2013-09-06 | 2013-12-18 | 鞍钢股份有限公司 | Method for measuring thickness of coating in confocal mode |
| CN106461373A (en) * | 2014-03-12 | 2017-02-22 | 晓温-威廉姆斯公司 | Real-time digitally enhanced imaging for the prediction, application, and inspection of coatings |
| CN104483330A (en) * | 2014-11-11 | 2015-04-01 | 浙江大学 | Concrete surface crack real-time monitoring system and cracking risk dynamic assessment method |
| CN108489413A (en) * | 2018-04-28 | 2018-09-04 | 华南理工大学 | A kind of concrete surface heterogeneous strain measuring system and method |
| CN109000578A (en) * | 2018-07-12 | 2018-12-14 | 上海海事大学 | A kind of building curtain wall wind pressure deformation monitoring method that the whole audience is contactless |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782010A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Anti-explosion coating test equipment and anti-explosion coating test method |
| CN110895217A (en) * | 2019-11-29 | 2020-03-20 | 昆明理工大学 | Method for making spots on surface of water-saturated rock test piece applied to digital speckle correlation method |
| CN111289395A (en) * | 2020-02-24 | 2020-06-16 | 天津商业大学 | Metal stress corrosion image testing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103575227B (en) | A kind of vision extensometer implementation method based on digital speckle | |
| CN106225678B (en) | Dynamic object positioning based on 3D cameras and volume measuring method | |
| CN109883344A (en) | A kind of detection method of marine anticorrosion coating surface strain and displacement | |
| CN109559348B (en) | Bridge non-contact deformation measurement method based on feature point tracking | |
| CN111947578A (en) | Structure displacement measuring system and measuring method thereof | |
| CN106643965B (en) | Method for accurately identifying liquid level by utilizing template matching | |
| CN102788572B (en) | Method, device and system for measuring attitude of lifting hook of engineering machinery | |
| CN104122560B (en) | Electric transmission line wide area ice condition monitoring method | |
| CN101957203B (en) | High-accuracy star tracking method of star sensor | |
| CN101900531B (en) | Method for measuring and calculating binocular vision displacement measurement errors and measuring system | |
| CN109000578A (en) | A kind of building curtain wall wind pressure deformation monitoring method that the whole audience is contactless | |
| CN110796681A (en) | Visual positioning system and method for cooperative work of ship | |
| CN112381860B (en) | Unmarked computer vision method for measuring dynamic frequency of rotating blade | |
| CN113469178B (en) | Power meter identification method based on deep learning | |
| CN107907064A (en) | A kind of monitoring fractures system and method | |
| CN111723821A (en) | Detection and identification method and device for power plant instrument image | |
| CN109900331A (en) | River discharge online test method based on depth camera signature tracking | |
| CN109060285A (en) | A kind of detection device and method of helical spring dynamic vibration characteristics | |
| CN112212935A (en) | Water level measuring method based on digital image processing | |
| CN106682579B (en) | Unmanned aerial vehicle binocular vision image processing system for detecting icing of power transmission line | |
| CN104515473A (en) | Online diameter detection method of varnished wires | |
| CN214199982U (en) | Structure displacement measuring system | |
| CN116310263A (en) | Pointer type aviation horizon instrument indication automatic reading implementation method | |
| CN112991342B (en) | Water level line detection method, device and system based on water level gauge image | |
| CN108960226A (en) | A kind of pointer instrument class expression value number reading method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190614 |
|
| RJ01 | Rejection of invention patent application after publication |