CN105910956A - Industrial CT analysis method of object density and density distribution - Google Patents
Industrial CT analysis method of object density and density distribution Download PDFInfo
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Abstract
The invention provides an industrial CT analysis method of object density and density distribution. The method comprises the following steps: a substance with known density which is used as a reference substance and a measured object are placed together onto a detection platform; the distance from the reference substance to the center of the detection platform is consistent with the distance from the measured substance to the center of the detection platform; linear arrays of the two substances are scanned; any tangent plane containing the measured substance and the reference substance in the detection result is used as an analytic object, and beam-hardened ring artifact center is used as the center of a circle to make a basic circle so as to obtain tangent plane positions of the reference object and the measured object with consistent distance to the center on the circumference of the basic circle; any point on the circumference of the basic circle on the tangent plane of the reference substance is used as the center of a circle to make a reference substance circle, the range of which is within the tangent plane of the reference substance; any point on the circumference of the basic circle on the tangent plane of the measured object is used as the center of a circle to make a measured substance circle, the range of which is within the tangent plane of the measured object; the measured substance circle has consistent area with the reference substance circle; analysis of gray is carried out on the two circles by industrial CT to obtain gray scale of the two circles; and density value of the measured object is calculated on the basis of the gray scale.
Description
Technical field
The invention belongs to material property detection technique field, in particular it relates to the method for testing of a kind of object density, especially
Relate to a kind of industry CT object analysis density and the method for Density Distribution.
Background technology
The ultimate principle of industry CT is different through attenuation quotient during different material according to X-ray, passes through radionetric survey
And image processing techniques, utilize Equations of Mathematical Physics solves the attenuation function obtaining different material, thus obtains the inside of material
Information.Testee is divided into multiple sufficiently small voxel cell, and the attenuation quotient of each voxel is considered as constant.By from
Multiple angles carry out CT image scanning, can obtain the attenuation quotient that each voxel is corresponding.In actual applications, declining with water
CT value, CT value=(voxel attenuation quotient-water fade coefficient)/water fade coefficient × 1000 are defined on the basis of subtracting coefficient.
The CT value of voxel is corresponded to the gray value on image, so-called CT image can be obtained.Gray value and material
Density is closely related, in same test, and gray value and density of material linearly dependency relation.Utilize this characteristic, can be right
The object being difficult to measure density measures or the density gradient of object is measured or calculated.
At present research generally uses Archimedes's drainage to carry out the test of density, but the method needs to immerse object
In water, it is impossible to for the density measurement of the objects such as biscuit of ceramics, and the density obtained by the method is the average density of exemplar,
The density gradient of interior of articles zones of different cannot be obtained.
Summary of the invention
For the above-mentioned deficiency of prior art, the technical problem to be solved is, it is provided that a kind of industry CT analysis
Object density and the method for Density Distribution.
For solving above-mentioned technical problem, on the one hand, the method for a kind of industry CT object analysis density provided by the present invention,
Including:
Using the material of known density as reference substance, it is placed on monitor station together with testee；
Described reference substance is consistent with the described testee distance apart from described monitor station center；
Described reference substance and described testee are carried out linear array scanning；
Take and testing result comprises the described testee arbitrary tangent plane with described reference substance for analyzing object, with beam hardening ring artifact
Center be that basic circle is done in the center of circle, obtain reference substance consistent with this centre distance on the circumference of described basic circle and measured object
The tangent plane position of body；
On the tangent plane of reference substance, on the circumference of described basic circle, any point makes reference thing circle for the center of circle, and this circle in-scope is all in institute
Within stating the tangent plane of reference substance；
On the tangent plane of testee, on the circumference of described basic circle, any point does testee circle for the center of circle, and this circle in-scope is equal
Within the tangent plane of described testee；And described testee circle is consistent with the area that described reference substance is justified；
Utilize industry CT that described testee circle and described reference substance circle are carried out gray analysis to obtain both gray scales；
Based on the density value of testee described in obtained gray count.
According to the present invention, utilize the gray value of industry CT Non-Destructive Testing and the linear corresponding relation of density of material, carry out tested
The Statistics of Density analysis of object.And the method using the industry CT object analysis density of the present invention, have highly sensitive, data
Feature reliably, it is possible to effectively object analysis density.
Also, in the present invention, it is also possible to it is, when described reference substance is the uniform material of component, by a known density
Material, as described reference substance, is placed on described monitor station together with described testee.
Also, in the present invention, it is also possible to be, when described reference substance is the uneven material of component, by multiple known close
The material of degree, as described reference substance, is placed on described monitor station together with described testee；Obtain each described reference substance
Described tangent plane position, on the tangent plane of each described reference substance, on the circumference of described basic circle, any point does multiple ginseng for the center of circle
Examining thing circle, each described reference substance circle in-scope is all within the tangent plane of corresponding described reference substance；And obtain multiple described ginseng
Examine the gray scale of thing circle, described in the meansigma methods of gray scale based on multiple described reference substances circle and the gray count of described testee circle
The density value of testee.
On the other hand, a kind of method that present invention also offers industry CT object analysis Density Distribution, including:
Using the material of known density as reference substance, it is placed on monitor station together with testee；
Described reference substance is consistent with the described testee distance apart from described monitor station center；
Described reference substance and described testee are carried out linear array scanning；
Take and testing result comprises the region multiple to be measured of described testee with arbitrary tangent plane of described reference substance for analyzing object, to penetrate
The center of bundle hardening ring artifact is that basic circle is done in the center of circle, obtains on the circumference of described basic circle consistent with this centre distance
The tangent plane position in the region multiple to be measured of reference substance and testee；
On the tangent plane of reference substance, on the circumference of described basic circle, any point makes reference thing circle for the center of circle, and this circle in-scope is all in institute
Within stating the tangent plane of reference substance；
On the tangent plane in the region multiple to be measured of testee, on the circumference of described basic circle, any point does multiple testee for the center of circle
Circle, each described testee circle in-scope is all within the tangent plane in the corresponding region multiple to be measured of described testee；And
Multiple described testees circle is consistent with the area of described reference substance circle；
Utilize industry CT that multiple described testees circle and described reference substance circle are carried out gray analysis to obtain respective gray scale；
The Density Distribution in multiple described regions to be measured is obtained by the gray value in relatively each region to be measured.
In accordance with the invention it is possible on the premise of not damaging tested object, the Density Distribution of the internal zones of different of object analysis,
Carry out the evaluation of material property.
According to following detailed description of the invention and with reference to accompanying drawing, be better understood with the foregoing of the present invention and other purpose,
Feature and advantage.
Accompanying drawing explanation
Fig. 1 is the sectional drawing carrying out certain biscuit of ceramics density measurement with homogeneous object aqueous water for reference substance；
Fig. 2 is with nonuniformity object for the sectional drawing of biscuit of ceramics density measurement during reference substance
Fig. 3 is with nonuniformity object for the linear relationship chart of gray scale, density of material during reference substance；
Fig. 4 is to illustrate the region X to be measured of certain testing sample, the photo in kind of Y location.
Detailed description of the invention
Below in conjunction with the progress being embodied as form and the accompanying drawing substantive distinguishing features and significance so that the present invention to be described.Ying Li
Solving, these embodiments are only used for being further described the present invention, it is impossible to be interpreted as limiting the scope of the invention.
In order to solve in prior art, the invention provides a kind of industry CT object analysis density and the method for Density Distribution.
According to the present invention, utilize the gray value of industry CT Non-Destructive Testing and the linear corresponding relation of density of material, carry out tested
The Statistics of Density analysis of object.And the method using the industry CT object analysis density of the present invention, it is possible to do not damaging measured object
On the premise of body, the Density Distribution of object analysis zones of different, carry out the evaluation of material property.Additionally, the method for the present invention is also
Have highly sensitive, the reliable feature of data.
The method of the industry CT object analysis density of the present invention is linear according to CT gray value in same test and density of material
Corresponding relation, utilizes the density gradient of industry CT test object or investigates object density, by the intensity profile of industry CT and
The known density of reference substance carries out the calculating of density.
The method of the industry CT object analysis density of the present invention relates to a kind of method of testing analyzing homogeneous object density ρ, profit
By the linear corresponding relation of the gray value of industry CT Non-Destructive Testing Yu density of material, calculate the density of homogeneous object.Specifically,
The method of the industry CT object analysis density according to the present invention one embodiment, specifically can comprise the following steps that
(1) can be ρ by a known density0, the uniform material of component as reference substance, be placed on monitor station together with testee.
(2) reference substance is consistent with the distance at testee distance monitor station center, to penetrate during eliminating industry CT detection
The bundle hardening impact on gray value.
(3) taking in testing result the arbitrary tangent plane comprising testee and reference substance is to analyze object, ring-type with beam hardening
The center of artifact is that circle 0 is done in the center of circle, obtains the reference substance consistent with this centre distance and testee on the circumference of circle 0
Tangent plane position.
(4) on the tangent plane of reference substance, on circle 0 circumference, any point does circle 1 for the center of circle, and this circle in-scope is all in ginseng
Within examining the tangent plane of thing.
(5) on the tangent plane of testee, on circle 0 circumference, any point does circle 2 for the center of circle, and this circle in-scope all exists
Within the tangent plane of testee, and circle 2 is consistent with the area of circle 1.
(6) utilizing industry CT that circle 1, circle 2 are carried out gray analysis, both gray scales are respectively g1、g2。
(7) repeat the above steps (4)-(6) three times, it is thus achieved that the average gray of reference substance and testee is g0、g。
(8) then the density value of testee can be calculated as ρ=ρ0·g0/g。
Additionally, when more difficult acquisition component reference substance equably, according to the industry CT analyte of another embodiment of the present invention
The method of body density, specifically can comprise the following steps that
(9) can be ρ by multiple, such as three or above known density1、ρ2、ρ3Material as reference substance, with measured object
Body is placed on monitor station together.
(10) each reference substance is consistent with the distance at testee distance monitor station center, during eliminating industry CT detection
The beam hardening impact on gray value.
(11) taking in testing result the arbitrary tangent plane comprising testee and reference substance is to analyze object, ring-type with beam hardening
The center of artifact is that circle 3 is done in the center of circle, obtains the reference substance consistent with this centre distance and testee on the circumference of circle 3
Tangent plane.
(12) on the tangent plane of each reference substance, on circle 3 circumference any point do for the center of circle circle of the same area 4,5,
6, each round in-scope is all within the tangent plane of corresponding reference substance.
(13) on the tangent plane of testee, on circle 3 circumference, any point does circle 7 for the center of circle, it is desirable to circle 7 areas and circle
4,5,6 is the most identical, and this circle in-scope is all within the tangent plane of testee.
(14) utilizing industry CT that circle 4-7 is carried out gray analysis, the gray value of the most each reference substance and tested inspection object is respectively
For g4、g5、g6、g。
(15) gray value g4、g5、g6With density value ρ1、ρ2、ρ3Between there is linear relationship, matching obtain through
The straight line of 3, brings gray value g into straight line and can obtain the density p of testee.
Additionally, a kind of method that present invention also offers industry CT object analysis Density Distribution, the method relates to a kind of analysis
The method of testing of homogeneous object density distribution, it is possible to the Density Distribution of the internal zones of different of object analysis, carries out commenting of material property
Valency.Specifically, according to the method for the industry CT object analysis Density Distribution of the present invention one embodiment, specifically can include following
Step:
(16) it is ρ by a known density0, the uniform material of component as reference substance, be placed on monitor station together with testee.
(17) reference substance is consistent with the distance at testee distance monitor station center, to penetrate during eliminating industry CT detection
The bundle hardening impact on gray value.
(18) adjust the angles of testee, take region A to be measured and the reference comprising testee in testing result
Arbitrary tangent plane of thing, for analyzing object, is cooked circle 0 with the center of beam hardening ring artifact for the center of circle, obtains the circumference at circle 0
The upper reference substance consistent with this centre distance and the tangent plane position of testee.
(19) on the tangent plane of reference substance, on circle 0 circumference, any point does circle 1 for the center of circle, and this circle in-scope is all in ginseng
Within examining the tangent plane of thing.
(20) on the tangent plane of testee, on circle 0 circumference, any point does circle 2 for the center of circle, and this circle in-scope all exists
Within the tangent plane of testee, and circle 2 is consistent with the area of circle 1.
(21) utilizing industry CT that circle 1, circle 2 are carried out gray analysis, both gray scales are respectively g1、g2。
(22) repeat the above steps (19)-(21) three times, it is thus achieved that the average gray of reference substance and tested object is g0、
gA。
(23) adjust the angles of tested object, take region B to be measured and the reference comprising testee in testing result
Arbitrary tangent plane of thing, for analyzing object, is cooked circle 0 ' with the center of beam hardening ring artifact for the center of circle, obtains the circumference at circle 0 '
The upper reference substance consistent with this centre distance and the tangent plane position of testee.
(24) on the tangent plane of reference substance, on circle 0 ' circumference, any point does circle 1 ' for the center of circle, and this circle in-scope all exists
Within the tangent plane of reference substance.
(25) on the tangent plane of testee, on circle 0 ' circumference, any point does circle 2 ' for the center of circle, and this circle in-scope is equal
Within the tangent plane of testee, and circle 2 ' is consistent with the area of circle 1 '.
(26) utilizing industry CT that circle 1 ', circle 2 ' are carried out gray analysis, both gray scales are respectively g1′、g2′。
(27) step (24)-(26) three times are repeated, it is thus achieved that the average gray of reference substance and tested object is g0′、gB
′。
(28) gray value of region B to be measured is through conversion gB=gB′·g0/g0′。
The Density Distribution of (29) two region A, B can pass through gA、gBCompare.
The method further describing the industry CT object analysis density of the present invention below by way of specific embodiment.
Embodiment 1
Known density can be respectively 1.00g/cm3Aqueous water A be reference substance, certain biscuit of ceramics B is carried out density calculating.
By exemplar A, B away from monitor station center same distance, to be uniformly placed on monitor station.Exemplar is carried out linear array sweep
Retouch.Comprising the arbitrary tangent plane of exemplar A, B in testing result is to analyze object, does with the center of beam hardening ring artifact for the center of circle
Circle 0, circle 0 is by the tangent plane through exemplar A-B body.
On the tangent plane of exemplar A, on above-mentioned circle 0 circumference, any point does circle 1 for the center of circle, and this circle in-scope is all at exemplar
Within the tangent plane of A.Relatively big at the tangent plane of testee B, with above-mentioned round 0 week, upper any point did circle of the same area for the center of circle
2、3.Each round in-scope is all within the tangent plane of corresponding testee.As shown in Figure 1.
Utilize industry CT that circle 1-3 is carried out gray analysis, its gray value gWater、gThing 1、gThing 2Respectively 136.42,
228.47、229.15。
The then density of testee
Embodiment 2
Known density can be respectively 1.07g, 1.56,1.13,0.98g/cm3Porous ceramics C, D, E, F be reference substance, right
Two biscuit of ceramics G, H carry out density calculating.
By exemplar C-H away from monitor station center same distance, to be uniformly placed on monitor station.Exemplar is carried out linear array sweep
Retouch.The arbitrary tangent plane comprising exemplar C-H tangent plane in testing result is analysis object, with the center of beam hardening ring artifact is
Circle 0 is done in the center of circle, and circle 0 is by the tangent plane through exemplar C-H body.
On the tangent plane of reference substance C-F, on above-mentioned circle 0 circumference, any point is round 1-4 of the same area for the center of circle, each
Circle in-scope is all within the tangent plane of corresponding reference substance.On the tangent plane of testee G, H, take up an official post with above-mentioned circle 0 circumference
A little being round 5-7 of the same area for the center of circle, owing to exemplar H is slightly larger, circle 6,7 is positioned on the tangent plane of same exemplar H.Often
Individual round in-scope is all within the tangent plane of corresponding testee.As shown in Figure 2.
Utilize industry CT that circle 1-7 is carried out gray analysis, its gray value g1-g7Be respectively 139.4,196.6,144.4,
124.8 and 208.4,209.8,210.0.
Gray value g1、g2、g3、g4And having linear relationship between the density value of corresponding reference substance, matching obtains through 3 points
Straight line g=120.47 ρ+7.41, as shown in Figure 3.By gray value g5-g7Bring straight line into, testee can be obtained
Density pG=1.67g/cm3And ρH=1.68g/cm3(ρH1And ρH2It is averaged and is ρH)。
Embodiment 3
Can aqueous water be just reference substance, contrast the Density Distribution of zones of different X of certain sample, Y, the position of X, Y such as Fig. 4 institute
Show.
Exemplar and reference substance are uniformly placed on monitor station.Adjust position and the disposing way of exemplar, by the region X of exemplar
Adjust to same level position with reference substance, exemplar is carried out linear array scanning.
Taking the tangent plane of inclusion region X and reference substance in testing result is analysis object, with the center of beam hardening ring artifact
Doing circle 0 for the center of circle, circle 0 is by the tangent plane through region X and reference substance.
On the tangent plane of reference substance, on circle 0 circumference, any point does circle 1 for the center of circle；On the tangent plane of region X, with circle 0
On circumference, any point is that the center of circle is done and circle 1 circle 2 of the same area.Each round in-scope is all within corresponding tangent plane.Such as figure
Shown in 1.
Utilize industry CT that circle 1-2 is carried out gray analysis, the gray value g of reference substance and region X0、gXIt is respectively
158.37、492.28。
Adjust position and the disposing way of exemplar, the region Y of exemplar is adjusted to same level position, to sample with reference substance
Part carries out linear array scanning.Taking the tangent plane of inclusion region Y and reference substance in testing result is analysis object, with beam hardening ring
The center of shape artifact is that circle 0 ' is done in the center of circle, and circle 0 ' is by the tangent plane through region Y and reference substance.
On the tangent plane of reference substance, on circle 0 ' circumference, any point does circle 1 ' for the center of circle；On the tangent plane of region Y, with circle
On 0 ' circumference, any point is that the center of circle is done and circle 1 ' circle 2 ' of the same area.Each round in-scope is all within corresponding tangent plane.
Utilize industry CT that two circles 1 ', 2 ' are carried out gray analysis, the gray value g of reference substance and region Y0′, g ' be respectively
129.35、403.93。
Then the gray value of region Y can be scaledThen region X, Y
Density size is for compare by gray value 492.28,494.55, and region Y is high compared with region X density by about 0.46%.
Under the objective without departing from the basic feature of the present invention, the present invention can be presented as various ways, therefore in the present invention
Embodiment is to be illustrative rather than definitive thereof, and owing to the scope of the present invention is defined by the claims rather than is limited by description, and
The all changes in the scope defined in claim, or the full scope of equivalents of its scope defined that fall are understood to be included in right
In claim.
Claims (4)
1. the method for an industry CT object analysis density, it is characterised in that including:
Using the material of known density as reference substance, it is placed on monitor station together with testee；
Described reference substance is consistent with the described testee distance apart from described monitor station center；
Described reference substance and described testee are carried out linear array scanning；
Take and testing result comprises the described testee arbitrary tangent plane with described reference substance for analyzing object, do basic circle with the center of beam hardening ring artifact for the center of circle, obtain the tangent plane position of reference substance consistent with this centre distance on the circumference of described basic circle and testee；
On the tangent plane of reference substance, on the circumference of described basic circle, any point makes reference thing circle for the center of circle, and this circle in-scope is all within the tangent plane of described reference substance；
On the tangent plane of testee, on the circumference of described basic circle, any point does testee circle for the center of circle, and this circle in-scope is all within the tangent plane of described testee；And described testee circle is consistent with the area that described reference substance is justified；
Utilize industry CT that described testee circle and described reference substance circle are carried out gray analysis to obtain both gray scales；
Based on the density value of testee described in obtained gray count.
Method the most according to claim 1, it is characterised in that
When described reference substance is the uniform material of component, using the material of a known density as described reference substance, it is placed on described monitor station together with described testee.
Method the most according to claim 1, it is characterised in that
When described reference substance is the uneven material of component, using the material of multiple known densities as described reference substance, it is placed on described monitor station together with described testee；Obtaining the described tangent plane position of each described reference substance, on the tangent plane of each described reference substance, on the circumference of described basic circle, any point does multiple reference substance circle for the center of circle, and each described reference substance circle in-scope is all within the tangent plane of corresponding described reference substance；And obtain the gray scale that multiple described reference substance is round, with the density value of testee described in the meansigma methods of gray scale based on multiple described reference substances circle and the gray count of described testee circle.
4. the method for an industry CT object analysis Density Distribution, it is characterised in that including:
Using the material of known density as reference substance, it is placed on monitor station together with testee；
Described reference substance is consistent with the described testee distance apart from described monitor station center；
Described reference substance and described testee are carried out linear array scanning；
Take and testing result comprises the region multiple to be measured of described testee with arbitrary tangent plane of described reference substance for analyzing object, do basic circle with the center of beam hardening ring artifact for the center of circle, obtain the tangent plane position in the region multiple to be measured of reference substance consistent with this centre distance on the circumference of described basic circle and testee；
On the tangent plane of reference substance, on the circumference of described basic circle, any point makes reference thing circle for the center of circle, and this circle in-scope is all within the tangent plane of described reference substance；
On the tangent plane in the region multiple to be measured of testee, on the circumference of described basic circle, any point does multiple testee circle for the center of circle, and each described testee circle in-scope is all within the tangent plane in the corresponding region multiple to be measured of described testee；And multiple described testee circle is consistent with the area that described reference substance is justified；
Utilize industry CT that multiple described testees circle and described reference substance circle are carried out gray analysis to obtain respective gray scale；
The Density Distribution in multiple described regions to be measured is obtained by the gray value in relatively each region to be measured.
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| CN108663287A (en) * | 2018-04-25 | 2018-10-16 | 中国地质大学（北京） | A method of accurately calculating coal petrography density using CT images |
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