CN108981822A - A kind of reflected light removing method of temperature deformation synchro measure - Google Patents
A kind of reflected light removing method of temperature deformation synchro measure Download PDFInfo
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- CN108981822A CN108981822A CN201810986688.3A CN201810986688A CN108981822A CN 108981822 A CN108981822 A CN 108981822A CN 201810986688 A CN201810986688 A CN 201810986688A CN 108981822 A CN108981822 A CN 108981822A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
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Abstract
本公开涉及一种温度形变同步测量的反射光消除方法，所述方法包括:获取被测件的参考点的初始温度、参考点的初始光强；加热被测件；采集被测件的图像，确定图像上的像素点的第一辐射光强；根据像素点的第一辐射光强、参考点的初始温度、初始光强，计算像素点的第一温度和蓝光通道的辐射光强；确定像素点的蓝光通道的反射光强；对像素点的第一辐射光强进行修正，得到像素点的修正辐射光强；根据像素点的修正辐射光强和参考点的修正辐射光强以及初始温度，计算像素点的第二温度；若每一个像素点的第二温度和第一温度的差值满足收敛条件时，将每一个像素点的第二温度确定为被测件表面的温度。能够有效消除反射光的影响，提高测量的精度。
The present disclosure relates to a method for eliminating reflected light in synchronous measurement of temperature and deformation, the method comprising: acquiring an initial temperature of a reference point of a test piece and an initial light intensity of the reference point; heating the test piece; collecting an image of the test piece, Determine the first radiation intensity of the pixel on the image; calculate the first temperature of the pixel and the radiation intensity of the blue channel according to the first radiation intensity of the pixel, the initial temperature of the reference point, and the initial light intensity; determine the pixel The reflected light intensity of the blue light channel of the point; correct the first radiant light intensity of the pixel point to obtain the corrected radiant light intensity of the pixel point; according to the corrected radiant light intensity of the pixel point, the corrected radiant light intensity of the reference point and the initial temperature, Calculate the second temperature of the pixel; if the difference between the second temperature of each pixel and the first temperature satisfies the convergence condition, determine the second temperature of each pixel as the temperature of the surface of the measured object. It can effectively eliminate the influence of reflected light and improve the accuracy of measurement.
Description
Technical field
This disclosure relates to field of measuring technique more particularly to a kind of reflected light removing method of temperature deformation synchro measure.
Background technique
Using CCD camera, is designed by reasonable optical path, light source and filter, the reflected light and spoke of body surface can be made
It penetrates light and is received processing respectively.The temperature of radiant light reactant, for calculating the temperature field of object.Reflected light reflects object table
The pattern in face, for calculating the displacement and Deformation Field of object.
Currently, the high ambient temperatures of actual test are generally in 3000K hereinafter, according to blackbody radiation theory, spoke at this time
Penetrate that energy red channel (R) wave band in visible light region is most strong, and green channel (G) is taken second place, and blue channel (B) is most weak.Therefore,
Blue channel is selected to be used to test displacement and Deformation Field as reflection optical channel, red channel and green channel are respectively as radiation
Optical channel, combines red channel and green channel is used to test temperature field.It selects red channel to compare with green channel, passes through ratio
Color method temperature-measurement principle, assuming that emissivity can be eliminated and varied with temperature in the case where material emissivity approximation and unrelated wavelength
Influence, correct object materials emissivity and temperature relationship.Select blue light source synchronous as temperature deformation under hot environment
The light source of measurement is the influence in order to avoid blue light source to radiation temperature measurement.
Colorimetric method thermometry principle is based on being completely absent ideally being derived for reflected light, actual environment
In there are reflected lights.When there are reflected light, superposition reflective light is needed to be calculated.Although original records figure can be passed through
The brightness of picture as reflected light, the brightness of subsequent image subtract original records image brightness eliminate reflected light influence, but by
It is temperature dependent in the reflectivity of object materials, therefore, reflected light can not be eliminated well, cause calculated result inaccurate.
Summary of the invention
In view of this, can effectively disappear the present disclosure proposes a kind of temperature-deformation synchro measure reflected light removing method
Except the influence of reflected light in temperature deformation synchro measure, synchronizing as a result, improving temperature deformation for temperature deformation synchro measure is corrected
The precision of measurement.
According to the one side of the disclosure, a kind of reflected light removing method of temperature deformation synchro measure, the side are proposed
Method includes:
Before step 1, heating measured piece, the initial temperature T of the reference point of measured piece is obtained0And the reference of measured piece
Initial beam intensity (the B of pointR0, BG0, BB0), wherein BR0Indicate the initial beam intensity of red channel, BG0Indicate the initial light of green channel
By force, BB0Indicate the initial beam intensity of blue channel；
Step 2, heating measured piece；
Step 3, the image for acquiring measured piece, and determine according to described image the of each pixel in described image
One radiation light intensity (BR1, BG1), wherein BR1、BG1After being illustrated respectively in heating measured piece, the radiation of the red channel of each pixel
The radiation light intensity of light intensity and green channel；
Step 4, for each pixel in described image, according to the first of the pixel the radiation light intensity (BR1,
BG1) and reference point initial temperature T0, initial beam intensity (BR0, BG0, BB0), the picture is calculated using enhancing colorimetric method temperature-measurement principle
First temperature T1 of the vegetarian refreshments and radiation light intensity B of blue channelB1, wherein BB1For the blue light of the pixel after heating measured piece
The radiation light intensity in channel；
Step 5, for each pixel in described image, according to blue channel the Relationship of Light intensity and the pixel
BB1, determine the reflective light intensity B of the blue channel of the pixelref；
Step 6, for each pixel in described image, according to the B of the pixelrefCorrect the B of the pixelR1、
BG1, obtain the red channel of the pixel and the amendment radiation light intensity B of green channelR1' and BG1'；
Step 7, for each pixel in described image, light intensity and reference point are radiated according to the amendment of the pixel
Amendment radiation light intensity and T0, using enhancing colorimetric method temperature-measurement principle, calculate the second temperature T2 of the pixel；
It is if the difference of the T2 and T1 of step 8, each pixel meet the condition of convergence, the T2 of each pixel is true
It is set to the temperature on measured piece surface.
In one possible implementation, the method also includes:
If the difference of the T2 and T1 of any one pixel are unsatisfactory for the condition of convergence, the amendment of reference point is radiated into light intensity
(BR0', BG0') and blue channel radiation light intensity BB0' it is determined as the prompt radiation light intensity of reference point, by each on image
The amendment of pixel radiates light intensity (BR1', BG1') it is determined as the first radiation light intensity of each pixel, return to step 4.
In one possible implementation, step 4 includes:
For each pixel in described image, according to the B of the pixelR1And BG1, reference point initial beam intensity BR0
And BG0And T0, using enhancing colorimetric method temperature-measurement principle, calculate the first temperature T1 of the pixel；
For each pixel in described image, according to T0、BR0、BB0And the B of the pixelR1, the first temperature
T1 calculates the radiation light intensity B of the blue channel of the pixel using enhancing colorimetric method temperature-measurement principleB1。
In one possible implementation, in step 5 according to blue channel the Relationship of Light intensity and the B of the pixelB1,
Determine the reflective light intensity B of the blue channel of the pixelref, comprising:
By the total light intensity B of the blue channel of the pixeltolWith radiation light intensity BB1Blue channel of the difference as the pixel
Reflective light intensity Bref。
In one possible implementation, the method also includes:
Obtaining the blue channel on image influences the radiant light influence of COEFFICIENT K 1, green channel on the radiant light of red channel
COEFFICIENT K 2.
In one possible implementation, the B according to the pixel in step 6refCorrect the B of the pixelR1、
BG1, obtain the red channel of the pixel and the amendment radiation light intensity B of green channelR1' and BG1', comprising:
According to the reflective light intensity B of the blue channel of the pixelrefThe B of the pixel is corrected with K1R1, obtain the pixel
Red channel amendment radiate light intensity BR1'；
According to the reflective light intensity B of the blue channel of the pixelrefThe B of the pixel is corrected with K2G1, obtain the pixel
Green channel amendment radiate light intensity BG1’。
In one possible implementation, step 8 includes:
It is when the average value of the difference of the T2 and T1 of all pixels point meets the condition of convergence, the T2 of each pixel is true
It is set to the temperature on measured piece surface.
In one possible implementation, step 8 includes:
When the maximum value in the absolute value of the difference of the T2 and T1 of all pixels point meets the condition of convergence, by each picture
The T2 of vegetarian refreshments is determined as the temperature on measured piece surface.
Image after being heated by the measured piece that acquisition image the obtains and feux rouges for calculating each pixel on image is logical
The radiation light intensity in road and the radiation light intensity of green channel, initial beam intensity, initial temperature in conjunction with reference point utilize enhancing colorimetric method
Temperature-measurement principle calculates the first temperature of each pixel and the radiation light intensity of blue channel；Then according to blue channel the Relationship of Light intensity
It can be concluded that the reflective light intensity of blue channel, so as to the spoke according to the reflective light intensity of calculated blue channel to pixel
It penetrates light intensity to be modified, effectively eliminates influence of the reflected light to measurement result.
Second temperature is calculated by further radiating light intensity according to revised amendment, the of each pixel
In the case that the difference of two temperature and the first temperature meets the condition of convergence, the second temperature of each pixel is determined as being tested
The temperature on part surface.
It is synchronous that temperature deformation can be effectively eliminated according to the reflected light removing method of the temperature deformation synchro measure of the disclosure
The influence of reflected light in measurement, amendment temperature deformation synchro measure as a result, improve temperature deformation synchro measure precision.
According to below with reference to the accompanying drawings to detailed description of illustrative embodiments, the other feature and aspect of the disclosure will become
It is clear.
Detailed description of the invention
Comprising in the description and constituting the attached drawing of part of specification and specification together illustrates the disclosure
Exemplary embodiment, feature and aspect, and for explaining the principles of this disclosure.
Fig. 1 shows the structural schematic diagram of the temperature deformation synchronized measurement system according to one embodiment of the disclosure.
Fig. 2 shows the flow charts according to the reflected light removing method of the temperature deformation synchro measure of one embodiment of the disclosure.
Fig. 3 shows the flow chart of the reflected light removing method of the temperature deformation synchro measure according to one embodiment of the disclosure.
Fig. 4 A shows the result schematic diagram for not eliminating reflected light in an exemplary temperature deformation synchro measure.
Fig. 4 B shows the result schematic diagram that reflected light is eliminated in the exemplary temperature deformation synchro measure of the disclosure one.
Fig. 5 shows the result schematic diagram of the exemplary temperature deformation synchro measure of the disclosure one.
Specific embodiment
Various exemplary embodiments, feature and the aspect of the disclosure are described in detail below with reference to attached drawing.It is identical in attached drawing
Appended drawing reference indicate element functionally identical or similar.Although the various aspects of embodiment are shown in the attached drawings, remove
It non-specifically points out, it is not necessary to attached drawing drawn to scale.
Dedicated word " exemplary " means " being used as example, embodiment or illustrative " herein.Here as " exemplary "
Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.
In addition, giving numerous details in specific embodiment below to better illustrate the disclosure.
It will be appreciated by those skilled in the art that without certain details, the disclosure equally be can be implemented.In some instances, for
Method, means, element and circuit well known to those skilled in the art are not described in detail, in order to highlight the purport of the disclosure.
Fig. 1 shows the temperature according to one embodiment of the disclosure-deformation synchronized measurement system structural schematic diagram.
As shown in Figure 1, the system may include: measured piece 1, Laboratory Module 2, wind tunnel window 3, sensation lens 4, filter plate
5, image acquisition units 6, blue light source 7, infrared radiation thermometer 8, sync control device 9, image processing unit 10.
Wherein, blue light source 7 is electrically connected with sync control device 9, and image acquisition units 6, infrared radiation thermometer 8 pass through respectively
Signal wire is electrically connected with sync control device 9, and sync control device 9 and image processing unit 10 are electrically connected.In Image Acquisition list
6 front of member sets gradually filter plate 5, sensation lens 4.Blue light source 7 passes through the measured piece 1 that wind tunnel window 3 is in Laboratory Module 2
Lighting source is provided.Image acquisition units 6 acquire the image of measured piece 1 by wind tunnel window 3, and infrared radiation thermometer 8 passes through wind
The temperature data of the acquisition measured piece 1 of hole observation window 3.
Wherein, measured piece 1 can be made of thermally protective materials, such as carbofrax material, modifying carbon/carbon material etc..It is tested
Part 1 can be made into plate, and the shape of plate can be rectangle, square etc..
Laboratory Module 2 can be set in arc tunnel, the ablation test for measured piece 1.Wherein, when arc tunnel is run
High pressure draught can be heated through electro-arc heater, be accelerated by nozzle expansion, high temp jet be formed, to being mounted on nozzle exit
Measured piece in Laboratory Module carries out ablation test.Temperature in Laboratory Module 2 can be 700~2600 degrees Celsius, can be used to pair
Measured piece 1 carries out the synchro measure of the temperature deformation under hot environment.
Wind tunnel window 3 may be mounted on the wall of Laboratory Module 2, and the phase of measured piece 1 can be acquired by wind tunnel window 3
Close data.Wind tunnel window 3 can install one or more, and the shape of wind tunnel window 3 can be rectangle, circle etc., for example,
It can be circle, can make 1 light of measured piece more uniform in this way.
Sensation lens 4 can be the component in image acquisition units 6, can recorde light variation, and light is transformed into
Electric signal transmission is to image acquisition units 6.
Filter plate 5 may be mounted between sensation lens 4 and image acquisition units 6.Filter plate 5 can be used to filter out feux rouges
The light of wave band, green light band makes feux rouges, green light largely decay, the light of blue wave band can be made all to pass through, in such manner, it is possible to
Influence of the reflected light to the deformation data of measured piece 1 caused by feux rouges, green light is reduced, the essence of the deformation data of measured piece 1 is improved
Degree.Image acquisition units 6 can be used to (for example, analog-to-digital conversion, storage etc.) is handled to the electric signal received, obtain by
Survey the image of part 1.Image acquisition units 6 can be CMOS camera CCD camera etc..
Blue light source 7 can be the light source for referring to issue electromagnetic wave of the wavelength between 400nm-450nm, such as: LED
Blue-ray light etc..Blue light source 7 can be used as the light source of temperature deformation synchro measure, radiant light can be avoided to test temperature as far as possible
Influence.
Infrared radiation thermometer 8 can be used to obtain the temperature of measured piece 1.Infrared radiation thermometer 8 can be by object itself spoke
The measurement for the infrared energy penetrated accurately measures its surface temperature.Infrared radiation thermometer 8 can be point Wen Yi, thermal infrared imager
Deng.
Sync control device 9 can control infrared radiation thermometer 8, image acquisition units 6 work asynchronously.Sync control device 9
It can be PLC (Programmable Logic Controller, programmable logic controller (PLC)) etc..
The quilt that image processing unit 10 can receive the temperature signal of the transmission of infrared radiation thermometer 8, image acquisition units 6 acquire
Survey the image of part 1.According to the image of the measured piece 1 of acquisition, each picture on the image of the available measured piece 1 of image processing unit 10
The radiation light intensity value of vegetarian refreshments.
Fig. 2 shows the flow charts according to the reflected light removing method of the temperature deformation synchro measure of one embodiment of the disclosure.
This method can be applied to system shown in FIG. 1, such as applied to image processing unit 10.As shown in Fig. 2, this method can wrap
It includes:
Step 1, before heating measured piece 1, the initial temperature T of the reference point of measured piece 1 is obtained0And the ginseng of measured piece 1
Initial beam intensity (the B of examination pointR0, BG0, BB0), wherein BR0Indicate the initial beam intensity of red channel, BG0Indicate the initial of green channel
Light intensity, BB0Indicate the initial beam intensity of blue channel.
In one possible implementation, as shown in Figure 1, can be selected on measured piece 1 before heating measured piece 1
Take the reference point a a little as measured piece 1.Image processing unit 10 opens blue light source by sync control device 9.At image
Reason unit 10 can control the initial temperature T that infrared radiation thermometer 8 obtains the reference point a of measured piece 1 by sync control device 90,
The image that measured piece 1 is acquired by image acquisition units 6 can obtain measured piece 1 according to the image of the measured piece 1 of acquisition and refer to
Initial beam intensity (the B of point aR0, BG0, BB0).For example, acquiring the image of the reference point a of measured piece 1, energy by image acquisition units 6
The brightness value for accessing R, G, B of reference point a, using softwares such as MATLAB, according to the light intensity of pixel and the line of its brightness value
Sexual intercourse, analysis obtain the initial beam intensity (B of reference point aR0, BG0, BB0)。
The above initial temperature of reference point for obtaining measured piece and the mode of initial beam intensity are only that some of the disclosure show
Example, the present disclosure is not limited thereto, can also determine the initial temperature value and initial beam intensity of the reference point of measured piece by other means
Value, for example, it is also possible to record the light intensity of each pixel during scanning measured piece by devices such as interference microscopes
Deng being not listed one by one.
Step 2, measured piece is heated.
In one possible implementation, measured piece can be heated under vacuum conditions.
In one example, as shown in Figure 1, closing the Laboratory Module of arc tunnel, Laboratory Module inside is carried out to vacuumize place
Reason, when treated Laboratory Module meets vacuum condition when, image processing unit 10 opens electric arc by sync control device 9, right
Measured piece 1 carries out Aerodynamic Heating.
Step 3, the image of measured piece is acquired, and determines according to described image of each pixel in described image
One radiation light intensity (BR1, BG1), wherein BR1、BG1After being illustrated respectively in heating measured piece, the radiation of the red channel of each pixel
The radiation light intensity of light intensity and green channel；
Wherein, each pixel in described image may include pixel corresponding with reference point a.
In one possible implementation, as shown in Figure 1, image processing unit 10 passes through after heating measured piece 1
Sync control device 9 can control the image that image acquisition units 6 acquire measured piece 1, can obtain the image of measured piece 1 in real time
On each pixel R, G, B brightness value, using softwares such as MATLAB, according to the radiation light intensity of pixel and its brightness
The linear relationship of value, analysis obtain the first radiation light intensity (B of each pixelR1, BG1), obtain the red of each pixel
The radiation light intensity B of optical channelR1, green channel radiation light intensity BG1。
Step 4, for each pixel in described image, according to the first of the pixel the radiation light intensity (BR1,
BG1) and reference point initial temperature T0, initial beam intensity (BR0, BG0, BB0), the picture is calculated using enhancing colorimetric method temperature-measurement principle
First temperature T1 of the vegetarian refreshments and radiation light intensity B of blue channelB1, wherein BB1For the blue light of the pixel after heating measured piece
The radiation light intensity in channel.
In one possible implementation, as shown in Figure 1, in step 3, obtaining every on the image of measured piece 1
First radiation light intensity (B of one pixelR1, BG1), lighting source of the blue light source 7 as arc tunnel, therefore, measured piece 1
Image on the red channel of each pixel, green channel there are radiant light caused by blue light source 7 and reflected light, because
This, needs to effectively eliminate influence of the blue light source to measurement temperature.
According to the initial beam intensity (B for the 1 reference point a of measured piece that step 1 obtainsR0, BG0, BB0), initial temperature T0, Yi Jibu
Rapid 3 the first obtained radiation light intensity (BR1, BG1), according to enhancing colorimetric method temperature-measurement principle, the of each pixel can be calculated
The radiation light intensity of the blue channel of each pixel after one temperature T1 and measured piece 1 heat.
Specifically, step 4 may include:
Step 41, for each pixel in described image, according to the B of the pixelR1And BG1, reference point just
Beginning light intensity BR0And BG0And T0, using enhancing colorimetric method temperature-measurement principle, calculate the first temperature T1 of the pixel.
According to blackbody radiation law and enhance colorimetric method temperature-measurement principle, the red channel of each available pixel,
Relational expression between the radiation light intensity and temperature of green channel are as follows:
Wherein, BRG0For measured piece 1 reference point a red channel initial beam intensity and green channel initial beam intensity ratio,
BRG1For the ratio of the first radiation light intensity of the red channel and green channel of some pixel on the image of measured piece 1, C2
For radiation constant, λRThe wavelength of the feux rouges of the radiation of red channel, λ when being heated for measured piece 1GGreen light is logical when heating for measured piece 1
The wavelength of the green light of the radiation in road, T1 are the first temperature value after measured piece 1 heats, T0For the initial temperature of 1 reference point a of measured piece
Degree.
For each pixel, light intensity (B is radiated by the first of pixelR1, BG1) and reference point a initial beam intensity
(BR0, BG0), initial temperature T0It is updated in above-mentioned relation formula, the first temperature T1 of each pixel can be calculated:
Step 42, for each pixel in described image, according to T0、BR0、BB0And the B of the pixelR1,
One temperature T1 calculates the radiation light intensity B of the blue channel of the pixel using enhancing colorimetric method temperature-measurement principleB1。
According to blackbody radiation law and enhance colorimetric method temperature-measurement principle, the red channel of each available pixel,
Relational expression between the radiation light intensity and temperature of blue channel are as follows:
Wherein, BRB0For the initial beam intensity of the initial beam intensity and blue channel of the red channel of the reference point a of measured piece 1
Ratio, BRB1For the ratio of the first radiation light intensity of the red channel and blue channel of some pixel on the image of measured piece 1
Value, λBFor the wavelength for the blue light that blue light source issues.
After the first temperature T1 for calculating pixel in step S41, light intensity B is radiated by the first of pixelR1, temperature
Initial beam intensity (the B of T1 and reference point aR0, BB0), initial temperature T0It is updated in above-mentioned relation formula, can be calculated each
The amendment of the blue channel of a pixel radiates light intensity BB1:
For reference point a, in order to be distinguished with initial beam intensity, the blue light for the reference point being calculated by the above process
The radiant light hypermnesia in channel is BB0’。
By above procedure, it can be calculated and radiate light intensity caused by blue light source 7.
Step 5, for each pixel in described image, according to blue channel the Relationship of Light intensity and the pixel
BB1, determine the reflective light intensity B of the blue channel of the pixelref。
The red channel of each pixel, green channel, blue channel can receive reflected light and radiant light respectively, because
This, the total light intensity of each optical channel can for the optical channel reflective light intensity and radiation light intensity and.By taking blue channel as an example, such as
Shown in Fig. 1, the image of measured piece 1, each picture on the image of available measured piece 1 are acquired by image acquisition units 6
The total light intensity B of the blue channel of vegetarian refreshmentstol.The radiation light intensity of the blue channel of each pixel is calculated according to step 4
BB1.Therefore, the reflective light intensity of the blue channel of each pixel on the image of measured piece 1 can be Bref=Btol-BB1。
Step 6, for each pixel in described image, according to the B of the pixelrefCorrect the B of the pixelR1、
BG1, obtain the red channel of the pixel and the amendment radiation light intensity B of green channelR1' and BG1'；
Each pixel as described above, lighting source of the blue light source 7 as arc tunnel, on the image of measured piece 1
There are the reflected lights that blue light source 7 generates for point.According to blue light source 7 to the red channel of each pixel, green channel
The reflective light intensity B of the blue channel of the influence coefficient and pixel of radiant lightref, the feux rouges of each pixel can be corrected
Channel, green channel radiation light intensity, obtain the red channel of each pixel amendment radiation light intensity BR1' and green channel
Amendment radiate light intensity BG1' and 1 reference point a of measured piece amendment radiation light intensity be (BR0', BG0’)。
In one possible implementation, the method can also include: obtain image on blue channel to feux rouges
The radiant light in channel influences COEFFICIENT K 1, the radiant light of green channel influences COEFFICIENT K 2.
Wherein, K1 and K2 is related to the response of blue light source 7 and the bandwidth of filter plate 5 with image acquisition units 6, wherein
Image acquisition units 6 influence blue light source to the responding to height of feux rouges, green light to the response curve of blue light source 7.Image Acquisition
When unit 6 dispatches from the factory, the response curve of blue light source 7 has been determined, then, blue light source is also true to the responding to height of feux rouges, green light
It is fixed constant.The bandwidth of filter plate 5 can influence the wave band by light source, and bandwidth is wider, by optical band it is wider, have one
Divide unwanted light to pass through, influences measurement accuracy.The bandwidth of filter plate 5 is narrower, by optical band it is narrower, measurement accuracy is got over
It is high.For example, the bandwidth of filter plate 5 is narrower in the case where image acquisition units 6 have been determined, the value of K1 and K2 are smaller, measurement accuracy
It is higher.
In one example, image processing unit 10 can be according to image acquisition units 6 to the response parameter of blue light source 7
With the bandwidth calculation K1 and K2 of filter plate 5.
In another example, above-mentioned calculated K1 and K2 can also be stored in local by image processing unit 10, every time
It is obtained when needing.
In the present embodiment, step 6 may include:
Step 61, according to the reflective light intensity B of the blue channel of the pixelrefThe B of the pixel is corrected with K1R1, it is somebody's turn to do
The amendment of the red channel of pixel radiates light intensity BR1’。
Illustratively, image processing unit 10 can calculate repairing for the red channel of each pixel according to the following formula
Positive radiation light intensity BR1':
B′R1=BR1- K1 ﹡ Bref。
Step 62, according to the blue channel reflective light intensity B of the pixelrefThe B of the pixel is corrected with K2G1, obtain the picture
The amendment of the green channel of vegetarian refreshments radiates light intensity BG1’。
Illustratively, image processing unit 10 can calculate repairing for the green channel of each pixel according to the following formula
Positive radiation light intensity BG1':
B′G1=BG1- K2 ﹡ Bref。
The mode for correcting the red channel of each pixel and the radiant light of green channel above is only the disclosure
Some examples, the present disclosure is not limited thereto, can also correct the radiation of pixel red channel and green channel by other means
Light is not listed one by one.
Image after being heated by the measured piece that acquisition image the obtains and feux rouges for calculating each pixel on image is logical
The radiation light intensity in road and the radiation light intensity of green channel, initial beam intensity, initial temperature in conjunction with reference point utilize enhancing colorimetric method
Temperature-measurement principle calculates the first temperature of each pixel and the radiation light intensity of blue channel；Then according to blue channel the Relationship of Light intensity
It can be concluded that the reflective light intensity of blue channel, so as to the spoke according to the reflective light intensity of calculated blue channel to pixel
It penetrates light intensity to be modified, effectively eliminates influence of the reflected light to measurement result.
Step 7, for each pixel in described image, light intensity and reference point are radiated according to the amendment of the pixel
Amendment radiation light intensity and T0, using enhancing colorimetric method temperature-measurement principle, calculate the second temperature T2 of the pixel；
As shown in Figure 1, the red channel of each pixel on the image of measured piece 1 can be obtained according to step 6
Amendment radiation light intensity BR1', the amendment of green channel radiate light intensity BG1', the radiation light intensity B of blue channelB1And measured piece 1
The amendment of reference point a radiates light intensity (BR0', BG0') and blue channel radiation light intensity BB0’。
By the amendment radiation light intensity of the red channel of each pixel on the image of measured piece 1 and repairing for green channel
Positive radiation light intensity, reference point a red channel amendment radiation light intensity and the amendment radiation light intensity of green channel, reference point a
Initial temperature T0, it is updated in the relational expression between red channel, green channel and the temperature of each pixel:
The second temperature T2 of the pixel is calculated,
By further according to revised amendment radiate light intensity calculate second temperature can be further to calculated the
One temperature is calibrated.
Step 8, if the difference of the T2 and T1 of each pixel meet the condition of convergence, the T2 of each pixel is true
It is set to the temperature on measured piece surface.
As shown in Figure 1, the first of each pixel being calculated according to step 4, step 7 on the image of measured piece 1
Temperature T1 and second temperature T2.
Ask the difference of second temperature T2 and the first temperature T1, each pixel on the image of available measured piece 1
Temperature residual error r, i.e. r=T2-T1.It is when temperature residual error meets the condition of convergence, the second temperature T2 of each pixel is true
It is set to the temperature of measured piece 1.
In one possible implementation, when the average value of the difference of the T2 and T1 of all pixels point meets the condition of convergence
When, the T2 of each pixel is determined as to the temperature on measured piece surface；
Maximum value in alternatively possible implementation, in the absolute value of the difference of the T2 and T1 of all pixels point
When meeting the condition of convergence, the T2 of each pixel is determined as to the temperature on measured piece surface.
Wherein, the condition of convergence can be set to 10 degrees Celsius.As example, in one example, when the image of measured piece 1
On each pixel the residual absolute value of the difference of temperature in maximum value be less than or equal to 10 degrees Celsius when judgement meet convergence item
Part.For example, working as | rmax| when≤10, the second temperature T2 of each pixel is determined as to the temperature of measured piece.
In another example, when the average value of the temperature residual error of each pixel on the image of measured piece 1 is less than
Judgement meets the condition of convergence when equal to 10 degrees Celsius, for example, the temperature residual error of each pixel is respectively r1、r2、r3……
rn, then the average value of the temperature residual error of pixelAs r≤10, by the second temperature of each pixel
Degree T2 is determined as the temperature on measured piece surface.
Certainly, the condition of convergence may be arranged as less than 5 degrees Celsius, 30 degrees Celsius etc., and the occurrence of the condition of convergence can be according to
It flexibly sets according to requirement of experiment, is not construed as limiting here.
Second temperature is calculated by further radiating light intensity according to revised amendment, the of each pixel
In the case that the difference of two temperature and the first temperature meets the condition of convergence, the second temperature of each pixel is determined as being tested
The temperature on part surface.
It is synchronous that temperature deformation can be effectively eliminated according to the reflected light removing method of the temperature deformation synchro measure of the disclosure
The influence of reflected light in measurement, amendment temperature deformation synchro measure as a result, improve temperature deformation synchro measure precision.
Image processing unit 10 can separate blue channel, obtain the radiant light and reflected light of blue channel, and according to anti-
Light is penetrated to make to obtain the deformation data of the image of measured piece 1.
Fig. 3 shows the flow chart of the reflected light removing method of the temperature deformation synchro measure according to one embodiment of the disclosure.
As shown in figure 3, the difference of the second temperature T2 of each pixel on the image of measured piece and the first temperature T1
When meeting the condition of convergence, second temperature T2 is determined as to the temperature on measured piece surface.
When the difference of the second temperature T2 and the first temperature T1 of any one pixel on the image of measured piece are unsatisfactory for
When the condition of convergence, the amendment of the reference point of measured piece is radiated into light intensity (BR0', BG0') and blue channel radiation light intensity BB0' really
It is set to the initial beam intensity of the reference point of measured piece, the amendment of each pixel on image is radiated into light intensity (BR1', BG1') really
Be set to each pixel first radiation light intensity, return to step 4, continue according to step 4- step 7 calculate the first temperature and
Whether second temperature, the first temperature and second temperature after then judging iteration again meet the condition of convergence, if being unsatisfactory for convergence item
Part, still repeatedly above procedure, until meeting the condition of convergence.
As shown in Figure 1, the difference of second temperature T2 and the first temperature T1 when each pixel on the image of measured piece 1
When value is unsatisfactory for the condition of convergence, the amendment of the red channel of each pixel on the image of measured piece 1 is radiated into light intensity
BR1', the amendment of green channel radiate light intensity BG1' it is determined as the first radiation light intensity of second of iteration, by 1 reference point a of measured piece
Amendment radiate light intensity (BR0', BG0') and blue channel radiation light intensity BB0' it is determined as the initial beam intensity of second of iteration, join
The initial temperature of examination point a remains as T0。
Fig. 4 A shows the result schematic diagram for not eliminating reflected light in an exemplary temperature deformation synchro measure.
As shown in Figure 4 A, x, y-axis respectively indicate the position of pixel.The right is 700-1000 degrees Celsius of corresponding temperature face
Vitta.When electric arc heated, measured piece temperature is gradually successively decreased around by center, and the temperature of center is high, edge
Temperature is minimum.By temperature color item it is found that temperature is higher, color is more shallow；Temperature is lower, and color is deeper.It is same based on temperature deformation
The temperature color of the measured piece of pacing amount is gradually deepened around by center, but the color of the edge of measured piece compared to
The color of center position is more shallow.It follows that being based on temperature since there are reflected lights in the environment of temperature deformation synchro measure
The temperature measurement result of the measured piece of deformation synchro measure is not inconsistent with temperature true value trend, measurement result inaccuracy.
Fig. 4 B is shown according to the result schematic diagram for eliminating reflected light in the exemplary temperature deformation synchro measure of the disclosure one.
According to the measurement result of the temperature deformation synchro measure reflected light removing method of the disclosure, if Fig. 4 B is it is found that be based on
The temperature color of the measured piece of temperature deformation synchro measure is gradually deepened around by center, i.e., the temperature of measured piece is by centre bit
Gradually successively decrease around at the place of setting.It follows that the temperature of the measured piece based on temperature deformation synchro measure reflected light removing method
Measurement result is consistent with the trend of temperature true value, can be improved the precision of temperature measurement.
Fig. 5 shows the result schematic diagram according to the exemplary temperature deformation synchro measure of the disclosure one.
As shown in figure 5, x-axis represents the position of pixel, y-axis represents temperature value corresponding to each pixel.Wherein,
Box is the temperature true value of measured piece, true value distribution trend approximate Gaussian distribution, wherein the true value of measured piece can refer to
In the case where any ambient light, measured piece is heated, the temperature value for the measured piece that infrared radiation thermometer measures is passed through；Dotted line is reflection
The temperature value of the measured piece of temperature deformation synchro measure before light elimination；Solid line is that the temperature deformation after reflected light is eliminated is same
The temperature value of the measured piece of pacing amount.It follows that the temperature value that reflected light obtains after eliminating is compared to there are reflected lights
The temperature value of temperature deformation synchro measure measured piece is closer to temperature true value.Therefore, it is based on temperature-deformation synchro measure measured piece
Reflected light removing method, the influence of reflected light in temperature-deformation synchro measure can be effectively eliminated, amendment temperature deformation is synchronous
Measurement as a result, it is possible to improve temperature-deformation synchro measure precision.
The presently disclosed embodiments is described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.The selection of term used herein, purport
In the principle, practical application or technological improvement to the technology in market for best explaining each embodiment, or lead this technology
Other those of ordinary skill in domain can understand each embodiment disclosed herein.
Claims (8)
1. a kind of reflected light removing method of temperature deformation synchro measure, which is characterized in that the described method includes:
Before step 1, heating measured piece, the initial temperature T of the reference point of measured piece is obtained0And the reference point of measured piece is first
Beginning light intensity (BR0, BG0, BB0), wherein BR0Indicate the initial beam intensity of red channel, BG0Indicate the initial beam intensity of green channel, BB0
Indicate the initial beam intensity of blue channel；
Step 2, heating measured piece；
Step 3, the image for acquiring measured piece, and determine according to described image the first spoke of each pixel in described image
Penetrate light intensity (BR1, BG1), wherein BR1、BG1After being illustrated respectively in heating measured piece, the radiation light intensity of the red channel of each pixel
With the radiation light intensity of green channel；
Step 4, for each pixel in described image, according to the first of the pixel the radiation light intensity (BR1, BG1) and
The initial temperature T of reference point0, initial beam intensity (BR0, BG0, BB0), the of the pixel is calculated using enhancing colorimetric method temperature-measurement principle
The radiation light intensity B of one temperature T1 and blue channelB1, wherein BB1For the spoke of the blue channel of the pixel after heating measured piece
Penetrate light intensity；
Step 5, for each pixel in described image, according to blue channel the Relationship of Light intensity and the B of the pixelB1,
Determine the reflective light intensity B of the blue channel of the pixelref；
Step 6, for each pixel in described image, according to the B of the pixelrefCorrect the B of the pixelR1、BG1,
Obtain the red channel of the pixel and the amendment radiation light intensity B of green channelR1' and BG1'；
Step 7, for each pixel in described image, according to the amendment radiation light intensity of the pixel and repairing for reference point
Positive radiation light intensity and T0, using enhancing colorimetric method temperature-measurement principle, calculate the second temperature T2 of the pixel；
If the difference of the T2 and T1 of step 8, each pixel meet the condition of convergence, the T2 of each pixel is determined as
The temperature on measured piece surface.
2. reflected light removing method according to claim 1, which is characterized in that the method also includes:
If the difference of the T2 and T1 of any one pixel are unsatisfactory for the condition of convergence, the amendment of reference point is radiated into light intensity
(BR0', BG0') and blue channel radiation light intensity BB0' it is determined as the initial beam intensity of reference point, by each pixel on image
The amendment of point radiates light intensity (BR1', BG1') it is determined as the first radiation light intensity of each pixel, return to step 4.
3. reflected light removing method according to claim 1, which is characterized in that step 4 includes:
For each pixel in described image, according to the B of the pixelR1And BG1, reference point initial beam intensity BR0And BG0
And T0, using enhancing colorimetric method temperature-measurement principle, calculate the first temperature T1 of the pixel；
For each pixel in described image, according to T0、BR0、BB0And the B of the pixelR1, the first temperature T1, utilize
Enhance colorimetric method temperature-measurement principle, calculates the radiation light intensity B of the blue channel of the pixelB1。
4. reflected light removing method according to claim 1, which is characterized in that in step 5 according to blue channel light intensity
The B of relationship and the pixelB1, determine the reflective light intensity B of the blue channel of the pixelref, comprising:
By the total light intensity B of the blue channel of the pixeltolWith radiation light intensity BB1Difference as the pixel blue channel it is anti-
Penetrate light intensity Bref。
5. reflected light removing method according to claim 1, which is characterized in that the method also includes:
Obtaining the blue channel on image influences the radiant light influence coefficient of COEFFICIENT K 1, green channel on the radiant light of red channel
K2。
6. reflected light removing method according to claim 5, which is characterized in that the B according to the pixel in step 6ref
Correct the B of the pixelR1、BG1, obtain the red channel of the pixel and the amendment radiation light intensity B of green channelR1' and BG1',
Include:
According to the reflective light intensity B of the blue channel of the pixelrefThe B of the pixel is corrected with K1R1, obtain the red of the pixel
The amendment of optical channel radiates light intensity BR1'；
According to the reflective light intensity B of the blue channel of the pixelrefThe B of the pixel is corrected with K2G1, obtain the green of the pixel
The amendment of optical channel radiates light intensity BG1’。
7. reflected light removing method according to claim 1, which is characterized in that step 8 includes:
When the average value of the difference of the T2 and T1 of all pixels point meets the condition of convergence, the T2 of each pixel is determined as
The temperature on measured piece surface.
8. reflected light removing method according to claim 1, which is characterized in that step 8 includes:
When the maximum value in the absolute value of the difference of the T2 and T1 of all pixels point meets the condition of convergence, by each pixel
T2 be determined as the temperature on measured piece surface.
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