CN104613888B - Smog deformation of body measuring method is passed through under a kind of flame smoky environment - Google Patents
Smog deformation of body measuring method is passed through under a kind of flame smoky environment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
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- 230000010354 integration Effects 0.000 claims description 9
- 238000003708 edge detection Methods 0.000 claims description 4
- 206010061619 Deformity Diseases 0.000 claims description 3
- 230000001815 facial effect Effects 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
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- 230000036244 malformation Effects 0.000 abstract description 2
- 230000001066 destructive effect Effects 0.000 abstract 1
- 238000004364 calculation method Methods 0.000 description 9
- 238000011084 recovery Methods 0.000 description 5
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Abstract
Through the deformation of body measuring method of smog under a kind of flame smoky environment, belong to malformation measurement and optical measurement mechanics field of measuring technique.The present invention irradiates surface and prepares the testee surface for having high temperature reflective mirror speckle by LASER Light Source or narrow-band light source, with CCD camera of the camera lens with optical filter object under test surface is shot through flame smog, obtain body surface minute surface speckle blurred picture, the clear original image that testee surface speckle is not obscured by flame smog is recovered by Phase Retrieve Algorithm, body surface is calculated by the body surface speckle shape profile variations during testee temperature distortion to deform, realize real-time measurement of full field testee areal deformation strain and displacement.The present invention is solved through flame smog to the real-time measurement of full field of deformation of body, be can be used under flame smoky environment object in stress or is heated etc. and to cause to carry out real-time full field deformation measure in deformation even destructive process.
Description
Technical field
The present invention relates to pass through smog deformation of body measuring method under a kind of flame smoky environment, belong to malformation measurement
With optical measurement mechanics field of measuring technique.
Background technology
It is the problem that a people pay close attention to research for a long time through scattering medium blur ed image restoration, by some image procossings
Method, be attempted to by object by scattering medium into blur ed image restoration through scattering medium the clear preimage of object,
This has been made that many research work in astronomical observation and medically through bio-tissue imaging research field.From the upper world seven
Since the ten's, recovering blurred picture by Phase Retrieve Algorithm turns into a study hotspot, seeks the laser sent from object
Or the method that narrow band light goes out the clear artwork of object through the blur ed image restoration that nonisotropic scattering medium is obtained.Subsequent more than 30 years
In, people propose many methods and respective algorithms for different situations, for example relax average alternating reflex method (Luke,
And phase controlling HIO methods (Harder et al. .2010) etc. 2005).
Optical measurement mechanics is the important method of deformation measurement, has the advantages that noncontact whole-field measuring.Modern optical measurement mechanics is borrowed
The development of digital image processing techniques and computer technology is helped, has developed a set of Digital Image Correlation Method measurement test specimen or structure
Deform under load.Digital Image Correlation Method makes random speckle image by test specimen surface, by digital correlation
Algorithm calculates the displacement of each speckle subregion on the front and rear test specimen of deformation, so as to obtain the overall strain of test specimen.By
Simple in party's subtraction unit, simple operation obtains extensive use in engineering structure part deformation measurement.Rim detection is directed to number
The computer digital image algorithm at word image detection testee edge, object structures part deformation in can to body surface some
Mark detects its edge, by the deformation for marking the deformation of profile to embody testee.However, Digital Image Correlation Method
In it is very sensitive to the change of the brightness fluctuation of light source lighting speckle, it is and due to environmental disturbances in some test environments, such as high
Warm heating environment Flame smog wraps up test specimen, and camera shoots the surface of test piece speckle image for obtaining and is distorted even
It is smudgy, cannot directly be deformed with digital image methods using blurred picture and calculated.
The content of the invention
The purpose of the present invention is to propose to pass through smog deformation of body measuring method under a kind of flame smoky environment, with phase
Recovery algorithms go out the clear artwork of object from object through the blur ed image restoration that nonisotropic scattering medium is obtained, with reference to digital picture
Edge detection method, deformation of body is calculated using testee surface speckle profile variations.
Technical scheme is as follows：Flame smog deformation of body measuring method is passed through under a kind of hot environment, including
Following steps：
1) reflective high temperature resistant minute surface speckle is made on testee surface；
2) testee of the surface with speckle is put into the chamber filled with flame smog, is placed in the hot loading bench of power
On, object under test is wrapped up by flame and smog, with light source lighting testee surface, clapped with the CCD camera with optical filter
The body surface minute surface speckle wrapped up by flame smog is taken the photograph, the body surface blurred picture of minute surface speckle reflection is obtained, will be shot
The incoming image computing module of blurred picture for obtaining；
3) image computing module uses Phase Retrieve Algorithm, and it is not fiery that body surface blur ed image restoration is gone out into testee
The fuzzy clear initial surface minute surface speckle image of flame smog, Phase Retrieve Algorithm uses iterative method, iteration until final acquisition
The clear initial surface minute surface speckle image that testee is not obscured by flame smog；
4) the hot loading bench of power is loaded to testee, and body surface is obtained with edge detection algorithm respectively before and after loading
Minute surface speckle edge contour, is shaped as reference pattern, by minute surface speckle wheel before taking loading for each minute surface speckle edge contour
Wide change calculations go out body surface minute surface speckle minute surface speckle deformation gradient F preceding relative to deformation after deformation, further obtain Green
Strain tensor E：
F in formulaTIt is the transposition of deformation gradient F, I is unit tensor, and object is obtained by the strain interpolation of each minute surface speckle
The strain of the whole audience, in the case of small deformation, small strain strain tensor is that Cauchy strain tensor ε is equal to above-mentioned Green strain tensor E,
Tri- component ε=(ε of ε ≈ E, whole audience strain field εx,εy,γxy), wherein x directions normal strain εx, y directions normal strain εyShould with shearing
Become γxyDefinition be respectively：
Wherein u, v be followed successively by body surface in the x-direction, the displacement of y directions；Thing is obtained by body surface whole audience strain field integration
Body surface facial disfigurement displacement field (u, v)：
Wherein C is path of integration, uO、vOPath of integration starting point x directions, the displacement constant in y directions are followed successively by,C1It is integral constant,
Reflective high temperature resistant minute surface speckle of the present invention is sprayed at testee surface, minute surface using aluminum oxide or silver
Being shaped as speckle is square, rhombus or triangle.The transmission peak wavelength of CCD camera optical filter of the present invention is in light source used
Cardiac wave is long.
The present invention compared with prior art, with advantages below and high-lighting effect：By digital image processing method application
Measured in deformation of body under flame smoky environment, overcome Fuzzy Influence of the flame smog to image, solve extremely complicated ring
The body surface deformation measurement wrapped up by flame smog under border.
Brief description of the drawings
Fig. 1 is shown through the structure of smog deformation of body measuring method embodiment under the flame smoky environment that the present invention is provided
It is intended to.
Fig. 2 is the body surface speckle shape example used by the present invention.
Fig. 3 is that testee surface speckle profile variations of the present invention survey body surface deformation principle schematic diagram.
In accompanying drawing：1- chambers；2- watch windows；3- flame fog guns；The hot loading bench of 4- power；5- light sources；6-CCD phases
Machine；7- image computing modules；8- testees.
Specific embodiment
Specific embodiment of the invention is further illustrated below in conjunction with the accompanying drawings, but protection of the invention should not be limited with this
Scope.
Through the structural representation of smog deformation of body measuring method embodiment under the flame smoky environment that Fig. 1 present invention is provided
Figure.Testee surface aluminum oxide or silvery make can reflection light minute surface speckle, speckle shape is square, rhombus or triangle
Shape, speckle surface it is smooth present minute surface can reflected illumination to its surface light, the body surface used by the present embodiment as shown in Figure 2
Special shape speckle example.
Testee of the surface with minute surface speckle is put into the chamber filled with flame smog, power heat loading is positioned over
On platform, object under test is wrapped up by flame and smog, and testee surface is illuminated with LASER Light Source, and testee is received on loading bench
Power or temperature distortion, the body surface wrapped up by flame smog is shot with the CCD camera with optical filter, obtains minute surface speckle
The body surface blurred picture of reflection, the incoming image computing module of blurred picture that shooting is obtained, image computing module uses phase
Bit recovery algorithm recovers the clear initial surface speckle image that testee is not obscured by flame smog, uses edge detection algorithm
Body surface speckle edge contour is obtained, body surface speckle profile is obtained respectively before and after being loaded to testee, for every
Individual speckle is shaped as reference pattern before taking deformation, and body surface whole audience strain field and position after deforming are calculated by speckle profile variations
Move field.
Operation principle of the invention is as follows：
Shot through non-uniform dielectric and obtain the picture rich in detail that blur ed image restoration is not blurred, calculated using phase recovery
Method, its algorithm is：
Wherein operatorFourier transformation operator and inverse Fourier transform operator are followed successively by, f (x, y) is survey
The clear original image gray scale of body surface speckle is taken the photograph, (x, y) is the pixel point coordinates of gray level image, and F (u, v) is f's (x, y)
Fourier transformation valueI is imaginary unitK is iterative steps, φk(u, v) is gk(x,
Y) phase of Fourier transformation value, θ 'k(u, v) is G'kThe phase of (u, v) inverse Fourier transform value, γ is decision space on (x, y),
For example (x, y) in γ (x, y) ∈ γ g'k(x, y) value is negative, and (x, y) be not in γG'k(x, y) value
It is nonnegative number, iterative initial value g1(x, y) is random distribution gray-scale map, and the variance of calculation error is：
As calculation error variance EkGo to zero, iterative calculation terminates, it is believed that the g for calculatingk+1(x, y) is and is not blurred
The clear original image of object.It is f'(x that camera directly shoots the original image that testee surface obtains, y), can by following formula
To obtain the mould of Fourier transformation value F (u, v) of f (x, y) | F (u, v) |：
W (x, y) is calculation window function in above formula, and typically using rectangular window, window size recovers speckle with body surface
Area size is roughly the same.I.e. according to recovery region filter function is calculated, the value outside window is taken as zero for its effect.
On the basis of above-mentioned Phase Retrieve Algorithm formula (I), some iteration qualifications can be increased and accelerate convergence rate,
Different calculation windows for example is used in different iterative calculation steps, is recovered image size and is fallen in calculation window, iterated to calculate
Only within calculation window, iterated conditional can also be exported using mixed iteration, i.e., the g in γ domainsk+1(x, y)=gk(x,y)-β
g'k(x, y), wherein β are the real number between 0 to 1.According to actual conditions, can be changed using different in different iteration steps
For condition, increase convergence rate.
By the body surface image with speckle to recovering, go out surface speckle profile using rim detection, by thing
Deform caused surface speckle profile variations in body thermal histories to be calculated the displacement field of body surface deformation, by position
Move field further calculate testee temperature distortion in real time, the strain field of the whole audience.
The speckle picture rich in detail that testee surface is not obscured by smog is restored with phase recovery method, in object stand under load
In deformation process, speckle profile also changes.Speckle profile is obtained by rim detection, is calculated by speckle profile variations and obtained
Speckle deformation gradient F, as shown in figure 3, can directly calculate strain field by deformation gradient, it is to avoid by displacement field once differentiation
The error for calculating strain field is amplified.Real deformation process is original minute surface speckle shape D0It is changed into shape D through deformation gradient F,
After trying to achieve deformation gradient F by minute surface speckle profile variations, for Finite-Deformation Problems, typically directly Green strain is obtained using F
Tensor E：
F in formulaTIt is the transposition of deformation gradient F, I is unit tensor.Object is obtained by the strain interpolation of each minute surface speckle
The strain of the surface whole audience, in the case of small deformation, conventional small strain strain tensor is that Cauchy strain tensor ε is equal to above-mentioned Green
Tri- component ε=(ε of strain tensor E, ε ≈ E, whole audience strain field εx,εy,γxy), wherein x directions normal strain εx, y directions normal strain
εyWith shear strain γxyDefinition be respectively：
Wherein u, v be followed successively by body surface in the x-direction, the displacement of y directions.Thing is obtained by body surface whole audience strain field integration
Body surface facial disfigurement displacement field (u, v)：
Wherein C is path of integration, uO、vOPath of integration starting point x directions, the displacement constant in y directions are followed successively by,C1It is integral constant,
Claims (5)
1. smog deformation of body measuring method is passed through under a kind of flame smoky environment, it is characterised in that the method includes following step
Suddenly：
1) reflective high temperature resistant minute surface speckle is made on testee (8) surface；
2) testee (8) of the surface with speckle is put into the chamber filled with flame smog (1), is placed in power heat loading
On platform (4), object under test is wrapped up by flame and smog, testee surface is illuminated with light source (5), with optical filter
CCD camera (6) shoots the body surface minute surface speckle wrapped up by flame smog, and the body surface for obtaining minute surface speckle reflection is obscured
Image, will shoot the incoming image computing module (7) of blurred picture for obtaining；
3) image computing module (7) uses Phase Retrieve Algorithm, and it is not fiery that body surface blur ed image restoration is gone out into testee
The fuzzy clear initial surface minute surface speckle image of flame smog, Phase Retrieve Algorithm uses iterative method, iteration until final acquisition
The clear initial surface minute surface speckle image that testee is not obscured by flame smog；
4) testee (8) is loaded using the hot loading bench of power (4), thing is obtained with edge detection algorithm respectively before and after loading
Body surface face minute surface speckle edge contour, is shaped as reference pattern, by minute surface before taking loading for each minute surface speckle edge contour
Speckle profile variations calculate body surface minute surface speckle minute surface speckle deformation gradient F preceding relative to deformation after deformation, further
Obtain Green strain tensor E：
F in formulaTIt is the transposition of deformation gradient F, I is unit tensor, and the object whole audience is obtained by the strain interpolation of each minute surface speckle
Strain, in the case of small deformation, small strain strain tensor is that Cauchy strain tensor ε is equal to above-mentioned Green strain tensor E, ε=E,
Body surface whole audience strain field Cauchy strain tensor ε has three component ε=(εx,εy,γxy), wherein x directions normal strain εx, y side
To normal strain εyWith shear strain γxyDefinition be respectively：
Wherein u, v be followed successively by body surface in the x-direction, the displacement of y directions；Object table is obtained by body surface whole audience strain field integration
Facial disfigurement displacement field (u, v)：
Wherein C is path of integration, uO、vOPath of integration starting point x directions, the displacement constant in y directions are followed successively by,C1It is integral constant,
2., according to smog deformation of body measuring method is passed through under a kind of flame smoky environment described in claim 1, its feature exists
Testee surface is sprayed at using aluminum oxide or silver in the reflective high temperature resistant minute surface speckle.
3., according to smog deformation of body measuring method is passed through under a kind of flame smoky environment described in claim 1, its feature exists
Square, rhombus or triangle are shaped as in the reflective high temperature resistant minute surface speckle.
4., according to smog deformation of body measuring method is passed through under a kind of flame smoky environment described in claim 1, its feature exists
LASER Light Source or narrow-band light source are used in the light source.
5., according to smog deformation of body measuring method is passed through under a kind of flame smoky environment described in claim 1, its feature exists
In：In step 2) described in the transmission peak wavelength of CCD camera optical filter be light source center wavelength used.
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| CN113808029A (en) * | 2021-05-25 | 2021-12-17 | 南京航空航天大学 | Strain smoothing method in digital image correlation |
| CN114018177B (en) * | 2021-11-18 | 2023-12-26 | 南昌航空大学 | Three-dimensional measurement method for mirror surface object based on speckle pattern |
| CN115616027B (en) * | 2022-10-13 | 2023-10-13 | 江苏瑞亿扬材料科技有限公司 | PVC calendering membrane temperature resistance detection device and detecting system |
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