CN106950128A - A kind of online dynamic ablation measurement apparatus and its measuring method for applying shock loading - Google Patents
A kind of online dynamic ablation measurement apparatus and its measuring method for applying shock loading Download PDFInfo
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0075—Strain-stress relations or elastic constants
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
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Abstract
The invention discloses a kind of online dynamic ablation measurement apparatus and its measuring method for applying shock loading.The measurement apparatus of the present invention includes：Dynamic ablation platform, shock loading bringing device, flame heating device, laser velocimeter, temperature measurement system, sample holding device, the first to the 3rd video camera and image processing system；The present invention uses shock loading bringing device, shock loading is loaded in the ablation process of test specimen, the size and material of suitable alluvium can be selected according to actual condition, and selection conflicting model and angle, and then the situation that is actually hit of simulation sample work simulates effect there is provided the sample closer to practical service environment；In combination with temperature measurement system and image processing system, the dynamic deformation that the temperature quantitative measurment to material oxidation ablation process, dynamic ablation process picture catching and sample can be achieved is measured.
Description
Technical field
The present invention relates to structural deformation e measurement technology, and in particular to a kind of online dynamic ablation measurement for applying shock loading
Device and its measuring method.
Background technology
Engine is the core component of aircraft, is aircraft mobility, voyage, reliability, economy and ambient influnence
One of deciding factor.Aero-engine Service Environment is severe, factor is complicated, and response of the material to environment has coupling and imitated
Should, rather than single environment exercising result superposition.Therefore, various countries in corresponding great investigation of materials in the works, all by material
Environmental performance simulation as main contents, aircraft composite plan that such as U.S. is formulated for 1988, nineteen ninety NASA,
The advanced heat engine ceramic technology plan that DOE and DoD joints are formulated is advanced with the following steam turbine generator of formulation in Japanese 1993
Material planning (AMG) etc. all coincidentally requires that the environmental performance for setting up material is characterized and database, and has developed ring first
Border analogy method, including experimental simulation and the aspect of numerical simulation two.
In terms of experimental simulation, two methods are presently, there are：The first is to use full ambient engine factorial experiments, directly obtains material
The result of the test of material.Although full ambient engine analogy method and equipment increasingly approaching to reality environment, shortcoming are also evident from, that is just
It is that the investment of analog machine and the cost of environment certification test rise at double.Second is the thing interacted from environment and material
Reason and chemical nature are set out, Development of Novel analog theory and experimental method.The characteristics of these methods is with material damage and destruction
Environmental control factor and material property governing factor be foundation, full ambient engine factor stimulation is reduced to the experiment mould of governing factor
Intend.For the environment and material simulation of engine structural material, the research of the overwhelming majority at present also focuses on material in itself
Physical and chemical performance, the property examination to material is concentrated mainly on ablation test aspect, and for the coupling of environment in ablation process
Close effect analog and consider seldom.Especially in actual use because engine sucks foreign particle or engine this body structure
Breakage, engine structure material can be hit by some particulate matters.Sometimes, hard thing can also hit aero-engine high temperature
The turbo blade at end, causes the badly damaged of thermal barrier coating.The slight crack of blade inlet edge will develop into fatigue crack, and spread and
Make whole blade damage.For simulating for the shock loading that may be subject in material actual operating conditions, due to ablation test sheet
The difficulty that the complexity and experiment porch of body are built, causes at present to apply impact load under the conditions of ablation not to material
The consideration of lotus, and there is obvious gap with the operating mode being subject in practice of material in this, therefore can not more accurately simulate description
Response of the material under real operating environments.Therefore the online work for applying shock loading this respect is carried out extremely important, to carrying
High material military service performance is also to play vital effect.
The content of the invention
For problems of the prior art, the present invention proposes a kind of online dynamic ablation for applying shock loading and surveyed
Measure device and its measuring method, can be achieved that material or structure are online during ablation to apply shock loading, simulation material or
Structural member is hit the situation of load in actual use, is burnt while entering trip temperature quantitative collection, dynamic to process of the test
Lose procedural image seizure, the picture catching of sample deformation situation；And propose that material or structural member are being rushed on this device basic
Ablation method of testing under the conditions of hitting.
It is an object of the present invention to propose a kind of online dynamic ablation measurement apparatus for applying shock loading.
The dynamic ablation measurement apparatus of the online application shock loading of the present invention includes：Dynamic ablation platform, shock loading
Bringing device, flame heating device, laser velocimeter, temperature measurement system, sample holding device, the first to the 3rd video camera and
Image processing system；Wherein, sample holding device is arranged on dynamic ablation platform；Sample is arranged in sample holding device,
The front of sample is striking face, and the face relative with striking face is the back side；Shock loading bringing device is just pacified to the striking face of sample
On dynamic ablation platform；Laser velocimeter is set between shock loading bringing device and the striking face of sample；Flame adds
The striking face of the nozzle alignment sample of thermal；Striking face of the temperature measurement system against sample；First video camera is against sample
Striking face, second and the 3rd video camera be located at different angles respectively against the back side of sample；First to the 3rd video camera point
Image processing system is not connected to it；Before ablation, the two dimensional image of the striking face of the first camera acquisition sample, and second and
The 3-D view at the back side of three camera acquisition samples, is used as initial reference image；The nozzle alignment sample of flame heating device
Striking face carry out ablation, while the image of the first to the 3rd camera acquisition test specimen；Temperature measurement system gathers hitting for sample
The temperature in face is hit, upon reaching a predetermined temperature, shock loading bringing device launching shock thing hits the striking face of sample；Laser
Tachymeter measures the speed of alluvium, so as to obtain Impact energy；First video camera obtains the striking face of sample in ablation process
Changed ablation image, image processing system analysis striking face changed ablation image, obtain hit before and hit after
The variable quantity of ablation velocity；Second and the 3rd video camera obtain the different angles at the back side of sample in ablation process in real time respectively
Image, image processing system obtains the 3 D deformation at the back side according to the principle of binocular stereo vision；Impact energy is inputted to figure
As processing system, the relation between image processing system analysis Impact energy and variable quantity and the 3 D deformation field of ablation velocity,
So as to obtain influence of the Impact energy to test specimen.
Shock loading bringing device includes base, inflation inlet, gas-filled switching tube, emission switch, air chamber, alluvium, gun tube, bullet
Support and bullet support recover；Wherein, floor installation is on dynamic ablation platform；In one end of air chamber, gun tube is set；Air chamber and gun tube
On base, striking face of the gun tube just to sample；Bullet support is set in gun tube, and alluvium is placed in bullet support, in gun tube
Top set bullet support recover；Air chamber the other end set inflation inlet, be respectively arranged with inflation inlet gas-filled switching tube and
Emission switch；Gas-filled switching tube is controlled, is inflated by inflation inlet into air chamber；Emission switch is opened, using draught head, by high pressure gas
Body discharges from gun tube, promotes bullet delivery to move, so that alluvium be launched from gun tube, bullet support is stayed in gun tube by bullet support recover
It is interior.The bullet support of corresponding size is selected according to the size of emitting substance and material.By controlling inflation inlet to chamber inflated, air chamber is controlled
Interior air pressure, so as to control the emission rate of alluvium；Single-impact or continuous several times impact can be applied.The axis of gun tube is punching
The center line of load bringing device is hit, alluvium and the center line of bullet support are overlapped with the axis of gun tube.
Flame heating device includes conduit and nozzle；Wherein, conduit is connected to nozzle, striking face of the nozzle just to test specimen；
Using modes such as gas heating or electric arc heateds；The array constituted using a nozzle or using multiple nozzles.
Temperature measurement system includes infrared radiation thermometer and computer；Wherein, infrared radiation thermometer is connected to computer；Infrared survey
Warm instrument gathers the temperature of test specimen striking face, sends data to computer.
Laser velocimeter, infrared radiation thermometer and first are arranged on dynamic by respective support respectively to the 3rd video camera
On ablation platform.
Sample, which accommodates device, includes specimen mounting base, support frame, rotating shaft, runing rest and clamping plate；Wherein, specimen mounting base
It is fixed on dynamic ablation platform；The bottom of runing rest is arranged on specimen mounting base by rotating shaft, the top of runing rest
Fixed by support frame with specimen mounting floor installation；Sample is by Boards wall on runing rest；Sample is centrally located at punching
On the center line for hitting load bringing device；Sample is set to form different angles from the direction of the launch of alluvium by rotating shaft.
It is another object of the present invention to provide a kind of online dynamic ablation measuring method for applying shock loading.
The dynamic ablation measuring method of the online application shock loading of the present invention, comprises the following steps：
1) before ablation, the two dimensional image of the striking face of the first camera acquisition sample, and second and the 3rd video camera
The 3-D view at the back side of sample is gathered, initial reference image is used as；
2) striking face of the nozzle alignment sample of flame heating device carries out ablation, while the first to the 3rd camera acquisition
The image of test specimen, temperature measurement system gathers the temperature of the striking face of sample in real time；
3) upon reaching a predetermined temperature, shock loading bringing device launching shock thing, hits the striking face of sample；
4) laser velocimeter measures the speed of alluvium, so as to obtain Impact energy；
5) the first video camera obtains the image of the changed ablation of the striking face of sample in ablation process, image processing system point
The image of the changed ablation of striking face is analysed, the variable quantity of the ablation velocity before hitting and after shock is obtained；
6) second and the 3rd video camera respectively in real time obtain ablation process in sample the back side different angles image, figure
As processing system obtains the 3 D deformation at the back side according to the principle of binocular stereo vision；
7) stress field of test specimen is obtained according to the elastic modelling quantity and Poisson's ratio of test specimen；
8) Impact energy is inputted to image processing system, the change of image processing system analysis Impact energy and ablation velocity
Relation between change amount and 3 D deformation, so as to obtain influence of the Impact energy to test specimen.
Wherein, in step 4) in, the speed of laser velocimeter measurement alluvium is v, according to the weight m of alluvium, can be asked
Obtain the Impact energy Q that alluvium has：
In step 5) in, the image of the changed ablation of the striking face of sample in ablation process is obtained by the first video camera,
The variable quantity of the ablation velocity before hitting and after shock is obtained, following steps are specifically included：
A) the first video camera shoots the image of the striking face changed ablation process of obtained sample, by slowing down high-speed photography
Ablation process animation is obtained, the generation of striking face oxide, flowing and the dynamic process developed of sample is observed and analyze；
B) by the image of the striking face changed ablation process of sample, the ablated area of striking face of sample is calculated with the time
Situation of change, obtain the ablation velocity function u of sample before impingement1, and sample bear hit after ablating rate function u2,
The variation delta u of ablation velocity is：Δ u=u2-u1。
In step 6) in, second and the 3rd video camera respectively in real time obtain ablation process in sample the back side different angles
Image, image processing system obtains the 3 D deformation at the back side according to the principle of binocular stereo vision, specifically includes following step
Suddenly：
A) 3 D stereo demarcation is carried out to the second video camera and the 3rd video camera before ablation starts；
B) according to the principle of binocular stereo vision, the second video camera and the 3rd video camera are clapped by the result demarcated in advance
Take the photograph the point matched in obtained image and carry out three-dimensional reconstruction, obtain the three-dimensional coordinate at the at a time back side of institute's test specimens；
C) former and later two not in the same time gained space coordinate difference be the point three-D displacement (u, v, w), pass through contraposition
Move the 3 D deformation (ε at the back side that field asks gradient to try to achieve samplex,εy,εxy)。
Advantages of the present invention：
The present invention uses shock loading bringing device, and shock loading is loaded in the ablation process of test specimen, can be according to reality
Border operating mode selects the size and material of suitable alluvium, and selection conflicting model and angle, and then simulates sample work
The situation that is actually hit simulates effect there is provided the sample closer to practical service environment；In combination with temperature measurement system with
Image processing system, can be achieved to the temperature quantitative measurment of material oxidation ablation process, dynamic ablation process picture catching and
The dynamic deformation measurement of sample.
Brief description of the drawings
Fig. 1 is the schematic diagram of the dynamic ablation measurement apparatus of the online application shock loading of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, by specific embodiment, the present invention is expanded on further.
As shown in figure 1, the dynamic ablation measurement apparatus of the online application shock loading of the present embodiment includes：Dynamic ablation is put down
Platform 1, shock loading bringing device, flame heating device 31 and 32, laser velocimeter 4, temperature measurement system 51 and 52, specimen holder
Hold device, the first to the 3rd video camera 71~73 and image processing system 8；Wherein, sample holding device is arranged on dynamic and burnt
Lose on platform 1；Sample 0 is arranged in sample holding device, and the front of sample 0 is striking face, and the face relative with striking face is the back of the body
Face；Shock loading bringing device is just arranged on dynamic ablation platform to the striking face of sample；Shock loading bringing device with
Laser velocimeter is set between the striking face of sample；The striking face of the nozzle alignment sample of flame heating device；Temperature survey system
Striking face of the system against sample 0；Striking face of first video camera 71 just to sample, second and the 3rd video camera 72 and 73 difference position
In different angles against the back side of sample 0；First to the 3rd video camera is respectively connecting to image processing system.
Shock loading bringing device includes base 21, inflation inlet 22, gas-filled switching tube 23, emission switch 24, air chamber 25, impact
Thing 26, gun tube 27, bullet support 28 and bullet support recover 29；Wherein, base 21 is arranged on dynamic ablation platform 1；In air chamber 25
One end sets gun tube 27；Air chamber 25 and gun tube 27 are arranged on base；The support of bullet 28 is set in gun tube 27, and alluvium 26 is placed on
In bullet support 28, bullet support recover 29 is set on the top of gun tube 27；Inflation inlet 22 is set in the other end of air chamber 25, in inflation inlet
Gas-filled switching tube 23 and emission switch 24 are respectively arranged with 22.
Flame heating device includes conduit 32 and nozzle 31；Wherein, conduit 32 is connected to nozzle 31, and nozzle is just to test specimen
Striking face.
Temperature measurement system includes infrared radiation thermometer 51 and computer 52；Wherein, infrared radiation thermometer 51 is connected to computer
52。
Sample, which accommodates device, includes specimen mounting base 61, support frame 62, rotating shaft 63, runing rest 64 and clamping plate 65；Wherein,
Specimen mounting base 61 is fixed on dynamic ablation platform 1；The bottom of runing rest 64 is arranged on specimen mounting base by rotating shaft 63
On 61, the top of runing rest is fixed by support frame with specimen mounting floor installation；Sample 0 is fixed on rotation branch by clamping plate 65
On frame 64；Sample is centrally located on the center line of shock loading bringing device；Make the transmitting of sample and alluvium by rotating shaft
Direction forms different angles.
The dynamic ablation measuring method of the online application shock loading of the present embodiment, comprises the following steps：
1) before ablation, the two dimensional image of the striking face of the first camera acquisition sample, and second and the 3rd video camera
The image at the back side of sample is shot from different angles, and image processing system obtains the back side of sample according to Binocular Vision Principle
3-D view, is used as initial reference image.
2) striking face of the nozzle alignment sample of flame heating device carries out ablation, while the first to the 3rd camera acquisition
The image of test specimen, temperature measurement system gathers the temperature of the striking face of sample in real time.
3) upon reaching a predetermined temperature, shock loading bringing device launching shock thing, hits the striking face of sample.
4) speed of laser velocimeter measurement alluvium is v, and according to the weight m of alluvium, can try to achieve alluvium is had
Impact energy Q：
5) the first video camera obtains the image of the changed ablation of the striking face of sample in ablation process, image processing system point
The image of the changed ablation of striking face is analysed, the variable quantity of the ablation velocity before hitting and after shock is obtained：
A) the first video camera shoots the image of the striking face changed ablation process of obtained sample, by slowing down high-speed photography
Ablation process animation is obtained, the generation of striking face oxide, flowing and the dynamic process developed of sample is observed and analyze；
B) by the image of the striking face changed ablation process of sample, the ablated area of striking face of sample is calculated with the time
Situation of change, obtain the ablation velocity function u of sample before impingement1, and sample bear hit after ablating rate function u2,
The variation delta u of ablation velocity is：Δ u=u2-u1。、
6) second and the 3rd video camera respectively in real time obtain ablation process in sample the back side different angles image, figure
As processing system obtains the 3 D deformation at the back side according to the principle of binocular stereo vision：
A) 3 D stereo demarcation is carried out to the second video camera and the 3rd video camera before ablation starts；
B) according to the principle of binocular stereo vision, the second video camera and the 3rd video camera are clapped by the result demarcated in advance
Take the photograph the point matched in obtained image and carry out three-dimensional reconstruction, obtain the three-dimensional coordinate at the at a time back side of institute's test specimens；
C) former and later two not in the same time gained space coordinate difference be the point three-D displacement (u, v, w), pass through contraposition
Move the 3 D deformation (ε at the back side that field asks gradient to try to achieve samplex,εy,εxy)。
7) stress field of test specimen is obtained according to the elastic modelling quantity and Poisson's ratio of test specimen.
8) Impact energy is inputted to image processing system, the change of image processing system analysis Impact energy and ablation velocity
Relation between change amount and 3 D deformation, so as to obtain influence of the Impact energy to test specimen.
It is finally noted that, the purpose for publicizing and implementing example is that help further understands the present invention, but this area
Technical staff be appreciated that：Without departing from the spirit and scope of the invention and the appended claims, it is various to replace and repair
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh
The scope that sharp claim is defined is defined.
Claims (9)
1. a kind of online dynamic ablation measurement apparatus for applying shock loading, it is characterised in that the measurement apparatus includes：Dynamic
Ablation platform, shock loading bringing device, flame heating device, laser velocimeter, temperature measurement system, sample holding device,
First to the 3rd video camera and image processing system；Wherein, the sample holding device is arranged on dynamic ablation platform；It is described
Sample is arranged in sample holding device, and the front of sample is striking face, and the face relative with striking face is the back side；The impact is carried
Lotus bringing device is just arranged on dynamic ablation platform to the striking face of sample；In the shock of shock loading bringing device and sample
Laser velocimeter is set between face；The striking face of the nozzle alignment sample of the flame heating device；The temperature measurement system
Against the striking face of sample；First video camera against sample striking face, second and the 3rd video camera respectively be located at difference
Angle against the back side of sample；Described first to the 3rd video camera is respectively connecting to image processing system；Before ablation, first takes the photograph
Camera collection sample striking face two dimensional image, and second and the 3rd camera acquisition sample the back side 3-D view,
It is used as initial reference image；The striking face of the nozzle alignment sample of flame heating device carries out ablation, while first to the 3rd takes the photograph
Camera gathers the image of test specimen；The temperature of the striking face of temperature measurement system collection sample, upon reaching a predetermined temperature, impact is carried
Lotus bringing device launching shock thing, hits the striking face of sample；Laser velocimeter measures the speed of alluvium, so as to be hit
Energy；First video camera obtains the image of the changed ablation of the striking face of sample in ablation process, and image processing system analysis is hit
The image of the changed ablation in face is hit, the variable quantity of the ablation velocity before hitting and after shock is obtained；Second and the 3rd video camera point
The image of the different angles at the back side of sample in ablation process is not obtained not in real time, and image processing system is according to binocular stereo vision
Principle obtains the 3 D deformation at the back side；Impact energy is inputted to image processing system, image processing system analysis Impact energy
Relation between variable quantity and the 3 D deformation field of ablation velocity, so as to obtain influence of the Impact energy to test specimen.
2. measurement apparatus as claimed in claim 1, it is characterised in that the shock loading bringing device includes base, inflation
Mouth, gas-filled switching tube, emission switch, air chamber, alluvium, gun tube, bullet support and bullet support recover；Wherein, the floor installation is dynamic
On state ablation platform；In one end of air chamber, gun tube is set；The air chamber and gun tube are arranged on base, and gun tube is just hit to sample
Hit face；Bullet support is set in gun tube, and alluvium is placed in bullet support, bullet support recover is set on the top of gun tube；In air chamber
The other end sets inflation inlet, and gas-filled switching tube and emission switch are respectively arranged with inflation inlet；Gas-filled switching tube is controlled, passes through inflation
Mouth is inflated into air chamber；Emission switch is opened, using draught head, gases at high pressure are discharged from gun tube, promotes bullet delivery dynamic, so that
Alluvium is launched from gun tube, bullet support recover stays in bullet support in gun tube.
3. measurement apparatus as claimed in claim 1, it is characterised in that the flame heating device includes conduit and nozzle；Its
In, the conduit is connected to nozzle, striking face of the nozzle just to test specimen；Mode of heating is heated or electric arc heated using gas；Adopt
The array constituted with a nozzle or using multiple nozzles.
4. measurement apparatus as claimed in claim 1, it is characterised in that the temperature measurement system includes infrared radiation thermometer and meter
Calculation machine；Wherein, the infrared radiation thermometer is connected to computer；The infrared radiation thermometer gathers the temperature of test specimen striking face, by number
According to transmitting to computer.
5. measurement apparatus as claimed in claim 1, it is characterised in that the sample, which accommodates device, includes specimen mounting base, branch
Support, rotating shaft, runing rest and clamping plate；Wherein, the specimen mounting base is fixed on dynamic ablation platform；The runing rest
Bottom be arranged on by rotating shaft on specimen mounting base, the top of runing rest is consolidated by support frame and specimen mounting floor installation
It is fixed；Sample is by Boards wall on runing rest；Sample is centrally located on the center line of shock loading bringing device；Pass through
Rotating shaft makes sample form different angles from the direction of the launch of alluvium.
6. a kind of online dynamic ablation measuring method for applying shock loading, it is characterised in that the measuring method includes following
Step：
1) before ablation, the two dimensional image of the striking face of the first camera acquisition sample, and second and the 3rd camera acquisition
The 3-D view at the back side of sample, is used as initial reference image；
2) striking face of the nozzle alignment sample of flame heating device carries out ablation, while the first to the 3rd camera acquisition test specimen
Image, temperature measurement system gathers the temperature of the striking face of sample in real time；
3) upon reaching a predetermined temperature, shock loading bringing device launching shock thing, hits the striking face of sample；
4) laser velocimeter measures the speed of alluvium, so as to obtain Impact energy；
5) the first video camera obtains the image of the changed ablation of the striking face of sample in ablation process, and image processing system analysis is hit
The image of the changed ablation in face is hit, the variable quantity of the ablation velocity before hitting and after shock is obtained；
6) second and the 3rd video camera obtain the images of the different angles at the back side of sample in ablation process in real time respectively, at image
Reason system obtains the 3 D deformation at the back side according to the principle of binocular stereo vision；
7) stress field of test specimen is obtained according to the elastic modelling quantity and Poisson's ratio of test specimen；
8) Impact energy is inputted to image processing system, image processing system analyzes the variable quantity of Impact energy and ablation velocity
Relation between 3 D deformation, so as to obtain influence of the Impact energy to test specimen.
7. measuring method as claimed in claim 6, it is characterised in that in step 4) in, laser velocimeter measurement alluvium
Speed is v, according to the weight m of alluvium, tries to achieve the Impact energy Q that alluvium has：
8. measuring method as claimed in claim 6, it is characterised in that in step 5) in, ablation is obtained by the first video camera
During sample striking face changed ablation image, obtain hit before and hit after ablation velocity variable quantity, specifically
Comprise the following steps：
A) the first video camera shoots the image of the striking face changed ablation process of obtained sample, is obtained by slowing down high-speed photography
Ablation process animation, observes and analyzes the generation of striking face oxide, flowing and the dynamic process developed of sample；
B) by the image of the striking face changed ablation process of sample, calculate sample striking face ablated area with the time change
Change situation, obtains the ablation velocity function u of sample before impingement1, and sample bear hit after ablating rate function u2, ablation
The variation delta u of speed is：Δ u=u2-u1。
9. measuring method as claimed in claim 6, it is characterised in that in step 6) in, second and the 3rd video camera it is real respectively
When obtain the images of the different angles at the back side of sample in ablation process, image processing system is according to the principle of binocular stereo vision
The 3 D deformation at the back side is obtained, following steps are specifically included：
A) 3 D stereo demarcation is carried out to the second video camera and the 3rd video camera before ablation starts；
B) according to the principle of binocular stereo vision, the second video camera and the 3rd video camera are shot by the result demarcated in advance
To image in the point that matches carry out three-dimensional reconstruction, obtain the three-dimensional coordinate at the at a time back side of institute's test specimens；
C) former and later two not in the same time gained space coordinate difference be the point three-D displacement (u, v, w), by displacement field
Gradient is sought, the 3 D deformation (ε at the back side of sample is tried to achievex,εy,εxy)。
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