CN108871585B - Temperature field measuring system and method based on one camera - Google Patents
Temperature field measuring system and method based on one camera Download PDFInfo
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- CN108871585B CN108871585B CN201810769907.2A CN201810769907A CN108871585B CN 108871585 B CN108871585 B CN 108871585B CN 201810769907 A CN201810769907 A CN 201810769907A CN 108871585 B CN108871585 B CN 108871585B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
Abstract
The invention discloses a kind of temperature field measuring system and method based on one camera, including measuring device and computing device；Measuring device includes entrance window, plate spectroscope, the first reflection microscope group, the second reflection microscope group, narrow band filter group and camera；Computing device includes temperature subscription module, image receiver module, matching module and temperature computation module；Entrance window is directed at test specimen to be measured when measurement, light is divided into light beam one and light beam two after entrance window injects plate spectroscope, light beam one and light beam two are injecting camera after the reflection of the first reflection microscope group and the second reflection microscope group, to which there are two pictures in the image of camera shooting, and then the temperature field of part to be measured can be calculated by color comparison temperature measurement formula.The present invention only needs a camera that can take the picture having there are two target image, while being suitable for hyperthermic temperature field and high-speed temperature field measurement, and measurement accuracy is very high.
Description
Technical field
The invention belongs to infrared heat field of measuring technique, survey more particularly, to a kind of temperature field based on one camera
Measure system and method.
Background technique
Measurement material surface temperature field is of great significance in fields such as space flight and aviation, machine-building, Vehicle Engineerings.
It is using high temperature as main feature applied to the development of engine in the engineerings such as aviation, automobile, steamer, engine turbine blade is made
For heated critical component, accurately measuring its surface temperature field distribution is the important link assessed its performance, predict its service life, is
Turbo blade reasonable material, Cooling Design, the prerequisite of thermal barrier coating protection design.However current engine turbine blade table
The temperature field measurement in face is high by internal engine temperature, narrow space, a series of unfavorable factors such as turbo blade high speed rotation
Restrict, conventional contact thermo detector not only response speed it is slow, can only single-point thermometric, but also material surface may be caused brokenly
It is bad, therefore it is not suitable for the temperature field measurement of turbo blade, and surveyed by the non-contact infrared of representative of two band color comparison temperature measurement method
Temperature meter can not only measure material surface whole audience temperature, but also have response fast, high resolution, measurement apart from adjustable, temperature-measuring range is wide etc.
Many advantages, therefore become the main method of engine turbine blade surface temperature field measurement in the engineerings such as aviation, automobile, steamer.
It is just necessary in order to improve the intensity and reliability of increasing material manufacturing product with the continuous development of increases material manufacturing technology
It is monitored on-line and is regulated and controled in the fabrication process.During metal increasing material manufacturing, high energy laser beam is by fusion of metal powder
Molten bath is generated, the temperature field information in molten bath plays a significant role analysis forming quality of products, residual stress, intensity etc., accurately
The temperature field in measurement molten bath is conducive to improve the accuracy of manufacture of increases material manufacturing technology.However during increasing material manufacturing molten bath range
Especially small, pace of change is especially fast, and temperature is especially high, using its temperature field of common infrared heat image instrument measuring, by thermal infrared imager
Resolution ratio and measurement frame per second limitation, often precision is difficult to reach requirement obtained measurement result；And increasing material manufacturing equipment
Integrated development trend makes certain limitation to the volume of temperature field measurement equipment；To sum up, one is needed in increasing material manufacturing engineering
Kind have high-resolution, high shooting frame rate, compact high-temperature temperature field measurement device.
Currently, having had more research for color comparison temperature measurement apparatus and method.For example, in Publication No.
In the Chinese patent of CN106755683A, a kind of blast-furnace roasting band temperature field detection device based on colorimetric method is disclosed, is used for
The thermo parameters method of real-time monitoring blast-furnace roasting band；The patent joined pretreatment in data handling, blackbody furnace demarcates whereabouts,
The reductions such as improved colorimetric method computation model, post-processing calculate error；However Patent design double camera measures optical path,
And two computers are needed to be controlled, one side higher cost, whole device volume is larger, and control and debugging are more multiple
Miscellaneous, on the other hand, light path design makes region to be measured different to the light path of two cameras, thus the figure for shooting two cameras
As of different sizes, increasing the later period makees the matched difficulty of image, brings certain error for temperature field measurement；Also, using double
Camera carries out temperature field measurement, it is difficult to ensure that double camera triggers simultaneously, this in the engineerings such as aerospace, automobile, steamer for sending out
High-speed rotating turbo blade in motivation, the needs high speed such as metal bath of Fast transforms is surveyed with ultrahigh speed in increasing material manufacturing industry
The field of amount, it will generate biggish measurement error.
In the Chinese patent of Publication No. CN107167249A, for the online prison of bath temperature during increasing material manufacturing
Survey technology, discloses a kind of one camera two band color comparison temperature measurement method and system, and this method can be surveyed using high speed camera
Temperature meets the demand of high speed measuring of temperature field of molten pool；This method devises one camera thermometric optical path simultaneously, reduces apparatus body
Product, meets the integrated demand of bath temperature field measurement device；But thermometric optical path shortcoming designed by the patent exists
In beam splitting system does not use plate spectroscope, but uses one piece of prism and be divided；Utilize plate spectroscope point
Light is with the difference being divided using prism, and light beam can be divided into two beams by 1:1 by plate spectroscope, this two-beam it is strong
Degree and Wavelength distribution are identical, and it is also identical to acquire its image with camera；And light beam cannot be divided by prism
Why two beams can take the piece image of two pictures in region to be measured through prism with camera, be due to prism difference
Face refraction action, the two-beam that region to be measured is issued projects to simultaneously on the target surface of camera, at this time camera phase
Region to be measured is shot when in from two angles, obtained two images are also not quite identical, and there are parallaxes；And it is to be measured
The radiation intensity of region in different directions is generally different, which will transmit through the two-beam of prism and unanimously locate according to intensity
Reason, increases Temperature calculating error.
In the Chinese patent of Publication No. CN101358881A, disclose a kind of double based on single colourful CCD camera
Wave band color comparison temperature measurement method, this method are filtered using two waveband interferometric filter, are then adopted using a colorful CCD camera
Collection image simultaneously calculates temperature field, avoids double camera and measures existing dispersion problem；But color camera chooses visible light wave
Section measures, and is easy to be influenced by object under test intrinsic colour, so that camera acquired image brightness is not exclusively object
Body selected wave band radiance, to bring error to calculated result；And it is high for high speed and ultrahigh speed measurement demand
Fast color camera is higher relative to high speed black and white camera cost.
Thermal infrared imager is common measuring tool in current temperature field measurement, but the common thermometric model of thermal infrared imager
1500 DEG C are trapped among hereinafter, be unable to measure 1500 DEG C or more of hyperthermic temperature field, and the spatial discrimination of general thermal infrared imager
Rate and spatial resolution are all lower, and for some high-precisions, high-resolution, high speed measurement demand, common thermal infrared imager is often
It is difficult to meet.
In addition, need to match collected two width correspondence image when carrying out Temperature calculating using colorimetric method,
Find the positional relationship of their corresponding points, but camera it is collected for calculating the original image in temperature field, usually do not have
Enough characteristic points are prepared enough, this is just to do images match to increase difficulty；And at present for the figure in colorimetric method temperature field measurement
As matching technique, also rare document is referred to.
Therefore, developing a kind of low in cost, compact, can flexibly debug, spatial resolution is high, and measurement accuracy is high,
And it is suitable for the temperature field measuring apparatus and method of high temperature and superhigh temperature amount, high speed and ultrahigh speed temperature field measurement, is infrared
High Temperature Measurement Technique field technical problem urgently to be resolved.
Summary of the invention
In view of this, the present invention provides a kind of temperature field measuring system and method based on one camera.It solves existing
Low, the at high cost problem of temperature field measurement precision to part to be measured in technology.
To solve the above-mentioned problems, the invention proposes a kind of temperature field measuring systems based on one camera, including measurement
Device and computing device；
The measuring device includes entrance window, plate spectroscope, the first reflection microscope group, the second reflection microscope group, narrow-band-filter
Piece group and camera；
The entrance window is one piece of transparent glass sheet, and the sheet glass is to each optical filter in the narrow band filter group
The light transmission rate of penetrated wave band is identical, the light issued for receiving part to be measured；The plate spectroscope and the entrance window
Between angle be the first predetermined angle；The plate spectroscope is used to the light received from the entrance window being bisected into two
The identical light beam one of beam and light beam two；
The first reflection microscope group includes the first reflecting mirror and the second reflecting mirror, and first reflecting mirror is respectively used to receive
And the light beam one is reflected, second reflecting mirror is for receiving and reflecting the light beam two；First reflecting mirror and described
Second reflecting mirror is symmetrical about plate spectroscope face, and the spectroscopical central point of the plate and first reflecting mirror
The distance of the central point of central point and second reflecting mirror is identical；
The second reflection microscope group includes third reflecting mirror and the 4th reflecting mirror, is respectively used to receive and reflect described first
The light beam one and the light beam two that reflection microscope group reflects；And between the third reflecting mirror and the 4th reflecting mirror
Angle be the second predetermined angle, the opening of second predetermined angle is towards the plate spectroscope, the third reflecting mirror and institute
It is symmetrical about plate spectroscope face to state the 4th reflecting mirror；
The narrow band filter group includes the first optical filter and the second optical filter, is respectively used to receive second reflecting mirror
The light beam one and the light beam two that group reflects；First optical filter and second optical filter be generally aligned in the same plane and
The second reflection microscope group is disposed side by side on far from the spectroscopical side of the plate, and first optical filter and described the
Two optical filters are symmetrical about plate spectroscope face；The central wavelength of first optical filter and second optical filter is not
Together, and the absolute value of the difference of the central wavelength of first optical filter and the second optical filter is less than 150nm；First optical filter
760nm is all larger than with the central wavelength of the second optical filter；
Camera setting in the narrow band filter group far from the spectroscopical side of the plate, and the camera
The middle position of narrow band filter group described in camera lens face；The light beam one and the light beam two pass through first reflecting mirror
The camera is injected after group, the second reflection microscope group and the narrow band filter group；
The computing device is used for the image taken according to the camera, calculates the temperature field on the part surface to be measured.
Further, the angle between the plate spectroscope and the entrance window is 45 °；
Angle between first reflecting mirror and second reflecting mirror and the plate spectroscope is respectively θ, described
The opening direction of angle theta is towards entrance window side, and 0 ° < θ < 20 °.
Further, the computing device includes:
Temperature subscription module, the target temperature value being heated for receiving the part to be measured, according to the target temperature value
Calibration coefficient K is determined with calibration coefficient curve, wherein the calibration coefficient curve is the correlation curve of temperature and calibration coefficient；
Image receiver module includes the first mesh on the target image for receiving the target image of the camera shooting
Mark region and the second target area；The first object region is the corresponding virtual image of the light beam one；Second target area
For the corresponding virtual image of the light beam two；The first object region and second target area are in mirror；Described first
It include N number of mark point on target area and second target area, the mark point is to clap to the part to be measured
Before taking the photograph, to the labels different from unmarked region degree of roughness of the part surface production to be measured；
Matching module, for executing following steps:
Mirror transformation is done to second target area using any straight line as axis, obtains third target area；
By each pixel unit on the first object region and each pixel on the third target area
Unit corresponds, and the pixel unit is pixel or sub-pix point；
Temperature computation module, described in corresponding one on the first object region and the third target area
Pixel unit is calculated using the following equation the corresponding temperature of the pixel unit on the part to be measured:
Wherein, C2Indicate second radiation constant, λ1、λ2Respectively indicate first optical filter and second optical filter
Central wavelength, η1、η2The camera is respectively indicated in λ1And λ2Spectral response value under wavelength, N1And N2Respectively indicate described
The gray value of a corresponding pixel unit on one target area and the third target area, K are calibration system
Number.
Further, the temperature subscription module determines the calibration coefficient curve using following methods:
The entrance window of measuring device described in fire door face by blackbody furnace；
It is stepped up the temperature of the blackbody furnace within the scope of default temperature, obtains a experimental temperature T1、T2···
Ta, wherein the target temperature value is located within the scope of the default temperature；
It for each experimental temperature, takes pictures respectively to the furnace wall of the blackbody furnace, obtains a reference image,
In, it is described referring to image include the first reference object region and the second reference object region, first reference object region and
Second reference object region is in mirror；
For, referring to image, doing mirror image change to second target area using any straight line as axis described in each
It changes, obtains third reference object region, it will be each on first reference object region and third reference object region
A pixel unit matches one by one, each described experimental temperature is brought into respectively in the formula (1), finds out each described reality
Test the corresponding calibration coefficient K of temperature；
The calibration coefficient curve is formed using experimental temperature described in each and each calibration coefficient K.
Further, the matching module uses following steps by each pixel unit on the first object region
It is corresponded with each pixel unit on the third target area:
The first object region and the third target area are respectively divided into p*q sub-regions, described in each
It all include several mark points on subregion；The subregion is square and side length is 2M pixel, and M is positive integer；
Any one of subregion in the first object region is chosen as first object subregion；
Subregion described in each of described third target area is successively chosen as third target subregion, use with
Lower formula calculates the correlation between the third target subregion and the first object subregion:
Wherein, C is the value of correlation, and the smaller expression correlation of C value is stronger, described in f (x, y) and g (x', y') are respectively indicated
The coordinate of first object subregion and the third target subregion, fmAnd gmThe respectively described first object subregion and described
The average gray value of third target subregion；
The strongest third target subregion of correlation with the first object subregion is chosen, with first object
Region is matched, and the central point of the first object subregion and the central point of the selected third target subregion are
For match point；
All subregions in all first object regions are successively chosen as the first object subregion,
It is matched by the formula (2) with the third target subregion in the third target area, obtains the first object
The matching relationship of all pixels unit in region and the third target area.
Further, the matching module uses following steps by each pixel unit on the first object region
It is corresponded with each pixel unit on the third target area:
The coordinate of each mark point is substituted into following equation group, goes out the third mesh by the solving equations
The general image for marking subregion is displaced U, Y-axis the first of X-direction relative to the general image of the first object subregion
Second displacement V and rotation angle, θ on direction；
Wherein, N is the quantity of the mark point, and N >=3, xi、yiFor i-th of mark point in the first object region
Coordinate；
xi'、yi' for the third target area i-th of mark point coordinate；
It, will be described by geometrical relationship according to the value of the first displacement U, the second displacement V and the rotation angle, θ
The position of each pixel unit on each pixel unit and the third target area on first object region carries out
It matches one by one.
To solve the above-mentioned problems, the invention also provides a kind of temperature field measurement methods based on one camera, including with
Lower step:
The target temperature value that part to be measured is heated is received, it is true according to the target temperature value and preset calibration coefficient curve
Determine COEFFICIENT K, wherein the calibration coefficient curve is the correlation curve of temperature and calibration coefficient；
Receive the image for the part to be measured that measuring device takes, wherein the image of the part to be measured includes mirror each other
As the first object region and the second target area of relationship；Be preset with N number of mark point on the part to be measured, the mark point be
Before being shot to the part to be measured, to the marks different from unmarked region degree of roughness of the part surface production to be measured
Note, wherein the measuring device is measuring device described in any one of claims 1 to 6；
Mirror transformation is done to second target area using any straight line as axis, obtains third target area；
By each pixel unit on the first object region and each pixel on the third target area
Unit is matched one by one, obtains all pixels unit in the first object region and all pictures of the third target area
Corresponding relationship between plain unit, the pixel unit are pixel or sub-pix point；
Pixel unit on the first object region described for one and with the pixel unit on the first object region
Pixel unit on the corresponding third target area, is calculated using the following equation the temperature T of the pixel unit,
Wherein, C2Indicate second radiation constant, λ1、λ2Respectively indicate the first optical filter of the measuring device and described
The central wavelength of second optical filter of measuring device, η1、η2The camera of the measuring device is respectively indicated in λ1And λ2Under wavelength
Spectral response value, N1And N2It respectively indicates on the first object region and the third target area described in corresponding one
The gray value of pixel unit, K are the calibration coefficient；
The temperature value that each pixel unit on the first object region is calculated separately by the formula (1), obtains
To the temperature field of the part to be measured.
Further, the entrance window of measuring device described in the fire door face by blackbody furnace；
It is stepped up the temperature of the blackbody furnace within the scope of default temperature, obtains a experimental temperature T1、T2···
Ta, wherein the target temperature value is located within the scope of the default temperature；
It for each experimental temperature, takes pictures respectively to the furnace wall of the blackbody furnace, obtains a reference image,
In, it is described referring to image include the first reference object region and the second reference object region, first reference object region and
Second reference object region is in mirror；
For, referring to image, doing mirror image to second reference object region using any straight line as axis described in each
Transformation, obtains third reference object region, will be every on first reference object region and third reference object region
One pixel unit matches one by one, each described experimental temperature is brought into respectively in the formula (1), is found out described in each
The corresponding calibration coefficient K of experimental temperature；
The calibration coefficient curve is formed using experimental temperature described in each and each calibration coefficient K.
Further, by the first object region each pixel unit with it is every on the third target area
The step of one pixel unit is matched one by one include:
The first object region and the third target area are divided into p*q sub-regions, each described sub-district
It all include several mark points on domain；The subregion is square and side length is 2M pixel, and M is positive integer；
Any one of subregion in the first object region is chosen as first object subregion；
Subregion described in each of described third target area is successively chosen as third target subregion, use with
Lower formula calculates the correlation between the third target subregion and the first object subregion:
Wherein, C is the value of correlation, and the smaller expression correlation of C value is stronger, described in f (x, y) and g (x', y') are respectively indicated
The coordinate of first object subregion and the third target subregion, fmAnd gmThe respectively described first object subregion and described
The average gray value of third target subregion；
The strongest third target subregion of correlation with the first object subregion is chosen, with first object
Region is matched, and the central point of the first object subregion is with the selected third target subregion central point
Match point；
All subregions in all first object regions are successively chosen as the first object subregion,
It is matched by the formula (2) with the third target subregion in the third target area, obtains the first object
The matching relationship of all pixels unit in region and the third target area.
Further, by the first object region each pixel unit with it is every on the third target area
The step of one pixel unit is matched one by one include:
The coordinate of each mark point is substituted into following equation group, goes out the third mesh by the solving equations
The general image for marking subregion is displaced U, Y-axis the first of X-direction relative to the general image of the first object subregion
Second displacement V and rotation angle, θ on direction；
Wherein, N is the quantity of the mark point, and N >=3, xi、yiFor i-th of mark point in the first object region
Coordinate；xi'、yi' for the third target area i-th of mark point coordinate；
According to the value of the first displacement U, the second displacement V and the rotation angle θ, by geometrical relationship by described the
The position of each pixel unit on each pixel unit and the third target area on one target area carries out one
One matching.
Compared with prior art, the temperature field measuring system and method provided by the invention based on one camera, is at least realized
It is following the utility model has the advantages that
One, incident light is divided into two bundles by the present invention by plate spectroscope, and by the first reflection microscope group and second
It reflects after the reflection of microscope group and enters the camera lens of camera simultaneously, there are two mesh so that the present invention only needs a camera that can take tool
The picture of logo image, avoiding two cameras in the prior art is inconvenient to synchronize the defect of triggering, improves measurement accuracy, simultaneously
It reduces costs；
Two, the present invention acquires calibration coefficient by experiment before calculating part temperature field to be measured by color comparison temperature measurement formula
Curve, and corresponding calibration coefficient K is selected according to the target temperature of part to be measured in specific detection, color comparison temperature measurement can be corrected
Cause due to wavelength bandwidth factor, by object under test approximation as factor, the non-uniform factor of system light splitting of black matrix etc. in method
Error, improve measurement accuracy；
Three, the present invention is by each sub-regions in each sub-regions and target area three on target area one
The correlation of the two is calculated by correlation calculations formula, it is ensured that the picture on first object region and third target area
It is more accurate that plain unit carries out matched result；
Four, the present invention carries out temperature measurement using colorimetric method, and measurement range covers high temperature and superhigh temperature field, overcomes
Existing thermal infrared imager is unable to measure the defect of hyperthermic temperature field；
Five, high-resolution camera can be used in camera in the present invention, greatly improves the spatial resolution in temperature field, meets
Temperature field high-resolution measurement demand compensates for the existing lower deficiency of thermal infrared imager resolution ratio；
Six, high speed and ultrahigh speed camera can be used in camera in the present invention, is applicable not only to middle low speed temperature field measurement, also fits
Temperature field measurement rate is greatly improved compared to common thermal infrared imager for high speed and ultrahigh speed temperature field measurement.
Certainly, implementing any of the products of the present invention specific needs while must not reach all the above technical effect.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
It is combined in the description and the attached drawing for constituting part of specification shows the embodiment of the present invention, and even
With its explanation together principle for explaining the present invention.
Fig. 1 is the structural schematic diagram of the temperature field measuring system based on one camera；
Fig. 2 is the module diagram of computing device；
Fig. 3 is to obtain the method flow diagram of calibration coefficient curve；
Fig. 4 is calibration coefficient curve synoptic diagram；
Fig. 5 is the signal to the matching process principle of each pixel unit on first object region and third target area
Figure；
Fig. 6 is the method flow diagram for carrying out actual measurement to part to be measured and calculating part temperature field to be measured.
In figure, 1, part to be measured；2, measuring device；3, computing device；301, temperature subscription module；302, image receives mould
Block；303, matching module；304, temperature computation module；4, entrance window；5, plate spectroscope；6, the second reflecting mirror；7, first is anti-
Penetrate mirror；81, third reflecting mirror；82, the 4th reflecting mirror；9, the second optical filter；10, the first optical filter；11, camera；12, the second mesh
Mark region；13, first object region；14, third target area.
Specific embodiment
Carry out the various exemplary embodiments of detailed description of the present invention now with reference to attached drawing.It should also be noted that unless in addition having
Body explanation, the unlimited system of component and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally
The range of invention.
Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to the present invention
And its application or any restrictions used.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Embodiment 1:
A kind of temperature field measuring system based on one camera is present embodiments provided, for measuring the temperature on part surface to be measured
, it is as shown in Figure 1 the structural schematic diagram of the temperature field measuring system based on one camera, including measuring device 2 and calculating dress
Set 3；
Measuring device 2 includes entrance window 4, the reflection of plate spectroscope 5, first microscope group, the second reflection microscope group, narrow band filter
Group and camera 11, and installed according to position shown in FIG. 1；When measuring the temperature field on 1 surface of part to be measured, first to be measured
Part 1 carries out heated load, then part 1 to be measured is placed at the position of face entrance window 4, due to part 1 to be measured itself can issue it is red
Outside line is being divided into identical light beam one and light beam two after plate spectroscope 5, and light beam one and light beam two are passing through first
Enter camera 11 after reflecting microscope group, the second reflection microscope group and narrow band filter slice group, therefore camera 11 is in the figure taken
In piece, can there are two pictures, respectively second target area in the first object region 13 of the formation of light beam one and the formation of light beam two
12.By two-color thermometry, the temperature on 1 surface of part to be measured can be found out according to first object region 13 and the second target area 12
?.
Specifically, entrance window 4 is one piece of transparent glass sheet, light of the sheet glass to two penetrated wave bands of narrow band filter
Transmitance is identical, the light issued for receiving part 1 to be measured；Usually entrance window 4 is vertically arranged, the inclination of plate spectroscope 5 is set
It sets, makes in a certain angle between plate spectroscope 5 and entrance window 4, defining the angle is the first predetermined angle, the first reflection microscope group packet
The first reflecting mirror 7 and the second reflecting mirror 6 are included, and the first reflecting mirror 7 and the second reflecting mirror 6 are faced about the plate spectroscope
Claim.First reflecting mirror 7 is for receiving simultaneously the reflected beams one, and the second reflecting mirror 6 is used to receive and the reflected beams two, and plate point
The central point of light microscopic 5 is identical at a distance from the central point of the first reflecting mirror 7 and the central point of the second reflecting mirror 6, so that light
The time for reaching the first reflecting mirror 7 and the second reflecting mirror 6 from plate spectroscope 5 is equal.
Second reflection microscope group includes third reflecting mirror 81 and the 4th reflecting mirror 82, is respectively used to receive and reflect the first reflection
The light beam one and light beam two that microscope group reflects；And in a certain angle between third reflecting mirror 81 and the 4th reflecting mirror 82 is set
It sets, the defined herein angle is the second predetermined angle, and the opening of the second predetermined angle is towards plate spectroscope 5；And third reflecting mirror
81 and the 4th reflecting mirror 82 it is symmetrical about plate spectroscope face.Second reflection microscope group receive light beam one and light beam two it
After light beam one and light beam two can be reflected at 11 camera lens of camera, with complete take pictures.
Narrow band filter group includes the first optical filter 10 and the second optical filter 9, and it is anti-to be respectively used to reception the second reflection microscope group
The light beam one and light beam two of injection；First optical filter 10 and the second optical filter 9 are generally aligned in the same plane and are disposed side by side on second instead
Side namely narrow band filter group setting of the microscope group far from plate spectroscope 5 are penetrated between camera 11 and the second reflection microscope group；And
And first optical filter 10 and the second optical filter 9 it is symmetrical about 5 face of plate spectroscope；The plane of symmetry of the plane of symmetry and the second reflection microscope group
It is identical.
Allow optical signal to pass through in specific wave band it should be noted that narrow band filter refers to, and deviates this wave band
The optical filter that two optical signals in addition are prevented from, it is narrow for usually defining 5% optical filter below that passband is center wavelength value
Band optical filter.First optical filter 10 is different with the central wavelength of the second optical filter 9, and the first optical filter 10 and the second optical filter 9
Central wavelength absolute value of the difference be less than 150nm；The central wavelength of first optical filter 10 and the second optical filter 9 is all larger than
760nm；So that light beam one and light beam two only have wavelength 760nm's or more after through narrow band filter group in remaining light
Infrared ray, and the first optical filter 10 is different but close with the central wavelength of the second optical filter 9, therefore passes through light beam one and light
The image that beam two is shot can acquire the temperature field of the image by color comparison temperature measurement formula.
Side of the narrow band filter group far from plate spectroscope 5, and the camera lens face institute of camera 11 is arranged in camera 11
State the middle position of narrow band filter group；Light beam one and light beam two are by the first reflection microscope group, the second reflection microscope group and narrowband
Camera 11 is injected after filter set；Camera 11 can be black and white camera, color camera, high speed camera etc., and concrete model can root
According to the size of part 1 to be measured, measuring speed, measurement accuracy and measurement apart from flexible type selecting.In the figure that camera 11 takes
As in, the second target area 12 that the first object region 13 and light beam two that will include the formation of light beam one are formed, due to light beam one
It is equidistant with light beam two from what the camera lens of the first reflection microscope group to camera 11 was passed through, so first object region 13 and second
Size of the target area 12 in same image is essentially equal, and is mirror.
Computing device 3 is used for the image taken according to camera 11, calculates the temperature field on 1 surface of part to be measured.
Compared with prior art, the present embodiment has the advantage that
Incident light is divided into two bundles by plate spectroscope, and is reflecting microscope group by the first reflection microscope group and second
Enter the camera lens of camera after reflection simultaneously, so that the present invention only needs a camera that can take tool must scheme there are two target image
Piece avoids the defect that two cameras in the prior art are not easy synchronous triggering, improves measurement accuracy, while reducing into
This.
Embodiment 2:
The present embodiment on the basis of embodiment 1, provides a kind of temperature field measuring system for being preferably based on one camera,
Related place is referred to the description of embodiment 1, the present embodiment only to the positional relationship between element each in measuring device into
Row explanation.
With continued reference to FIG. 1, the angle between plate spectroscope 5 and entrance window 4 is preferably 45 °, so that from part 1 to be measured
Level injects the light of plate spectroscope 5, and a part is converted into the light beam one of horizontal direction, and another part is the light of vertical direction
Beam two.Angle between first reflecting mirror 7 and the second reflecting mirror 6 and plate spectroscope 5 is respectively θ, the opening direction court of angle theta
To entrance window side, and 0 ° < θ < 20 °.Angle between third reflecting mirror 81 and the 4th reflecting mirror 82 is acute angle, specifically can root
The distance adjustment of the distance and 11 distance second of camera reflection microscope group of microscope group is reflected, according to the second reflection microscope group distance first with energy
The light beam one and light beam two that the first reflection microscope group reflects enough are received, and light beam one and light beam two are reflected into 11 camera lens of camera
Subject to.Angle in the present embodiment between third reflecting mirror 81 and the 4th reflecting mirror 82 is 60 °.Further, it can also use
The prism of isosceles triangular structure replaces, and keeps the structure of the second reflection microscope group more stable.
Embodiment 3:
The present embodiment provides a kind of temperature field measurement system based on one camera on the basis of embodiment 1 and embodiment 2
System, related place can be with the description of reference implementation example 1 and embodiment 2.Computing device is described further in the present embodiment.
Fig. 2 is the module diagram of computing device, and computing device 3 includes: combined with Figure 1 and Figure 2,
Temperature subscription module 301, the target temperature value being heated for receiving part 1 to be measured, according to target temperature value and mark
Determine coefficient curve and determine calibration coefficient K, wherein calibration coefficient curve is the correlation curve of temperature and calibration coefficient；K is colorimetric survey
The coefficient of a calibration in warm formula, the value of K change with the temperature change of part 1 to be measured, can correct colorimetric by COEFFICIENT K
Since wavelength bandwidth factor, system are divided error caused by non-uniform factor etc., raising measurement accuracy in thermometry.
Image receiver module 302 includes first object area on target image for receiving the target image of the shooting of camera 11
Domain 13 and the second target area 12；First object region 13 is the corresponding virtual image of light beam one；Second target area 12 is light beam two
The corresponding virtual image；First object region 13 and second target area 12 are in mirror；
Before taking pictures to part 1 to be measured, staff is needed to mark N number of mutually different label on part 1 to be measured
Point can specifically use the equipment such as laser marking machine in the mark point of the 1 suitable size of surface marking of part to be measured, so that at mark point
It is more coarse compared to other parts, by the degree of roughness at the mark point, when taking pictures with xenon lamp light filling, at mark point pair
The light degree of reflection through wave band of two selected narrow band filters has significant difference with the place not marked point, in this way
Could the image with mark point clearly be photographed using camera 11.It furthermore can also be equal on 1 surface of part to be measured by oil pen
The mark point of suitable size is smeared, principle is to change the degree of roughness on 1 surface of part to be measured.
Matching module 303, with following steps by first object region 13 each pixel unit and third target area
Each pixel unit on domain 14 corresponds: where pixel unit is pixel or sub-pix point；
First object region 13 and third target area 14 are respectively divided into p*q sub-regions, in each sub-regions
It all include several mark points；Subregion is square and side length is 2M pixel；
Any one subregion in first object region 13 is chosen as first object subregion；
Each of third target area 14 subregion is successively chosen as third target subregion, using following formula
Calculate the correlation between third target subregion and first object subregion:
Wherein, C is the value of correlation, and the smaller expression correlation of C value is stronger, and f (x, y) and g (x', y') respectively indicate first
The coordinate of target subregion and third target subregion, fmAnd gmRespectively first object subregion and third target subregion
Average gray value；
The strongest third target subregion of correlation with first object subregion is chosen, is carried out with first object subregion
Matching, first object subregion central point and selected third target subregion central point are match point；
All subregions in all first object regions 13 are successively chosen as first object subregion, pass through formula
(2) it is matched with the third target subregion in third target area 14, obtains first object region 13 and third target area
The matching relationship of all pixels unit in domain 14.
It can be calculated on third target subregion and first object region 13 on third target area 14 by formula (2)
The value of correlation between first object subregion, obtaining size by relevance values may determine that third target subregion and
Whether one target subregion is same sub-regions on part 1 to be measured.To all subregions in institute's first object region 13
It finds in third target area 14 after each sub-regions corresponding with first object region 13, it can complete the first mesh
Mark the matching of all pixels unit on region 13 and third target area 14.In order in the color comparison temperature measurement formula for calculating temperature field
In, smoothly obtain corresponding parameter.
Temperature computation module 304, for a pixel corresponding on first object region 13 and third target area 14
Unit is calculated using the following equation the corresponding temperature of pixel unit on part 1 to be measured:
Wherein, C2Indicate second radiation constant, λ1、λ2Respectively indicate the first optical filter 10 and second optical filter 9
Central wavelength, η1、η2Camera 11 is respectively indicated in λ1And λ2Spectral response value under wavelength, N1And N2Respectively indicate first object area
The gray value of a corresponding pixel unit on domain and third target area；K is calibration coefficient, is determining the heating of part 1 to be measured
Target temperature value after, i.e., the corresponding calibration coefficient K of target temperature is obtained by calibration coefficient curve, next will be described in detail
How calibration coefficient curve is obtained.
Fig. 3 is to obtain the method flow diagram of calibration coefficient curve, and Fig. 4 is calibration coefficient curve synoptic diagram, such as Fig. 3 and Fig. 4
It is shown,
Determine the method for calibration coefficient curve specifically includes the following steps:
S101: by the entrance window of the fire door face measuring device of blackbody furnace；
S102: it is stepped up the temperature of blackbody furnace within the scope of default temperature, obtains a experimental temperature T1、T2···
Ta, wherein target temperature value is located within the scope of default temperature；Preset temperature range is usually to measure part temperature field to be measured
Temperature range will be generally greater than 600 DEG C of temperature in the art and be defined as high temperature, and the temperature of the heated load of part to be measured is usually not
Less than 600 DEG C.Such as preset temperature range is 600 DEG C -1000 DEG C, and corresponding a experiment can be set according to accuracy requirement
Temperature, for example, in preset temperature at interval of 50 DEG C take an experimental temperature to get the experimental temperature arrived be 600,650,700,
750,800,850,900,950,1000, unit be degree Celsius, amount to 9 experimental temperatures.
S103: for each experimental temperature, respectively taking pictures to the furnace wall of blackbody furnace, obtains a reference image,
In, it include the first reference object region and the second reference object region, the first reference object region and described second referring to image
Reference object region is in mirror；
S104: for each referring to image, mirror image change is done to second target area using any straight line as axis
It changes, obtains third reference object region, by each pixel list on the first reference object region and third reference object region
Member matches one by one, each experimental temperature is brought into respectively in formula (1), the corresponding calibration coefficient of each experimental temperature is found out
K, last available a calibration coefficient K.
S105: calibration coefficient curve is formed using each experimental temperature and each calibration coefficient K.That is, in a coordinate system
X-axis be temperature, y-axis is calibration coefficient K, and the maximum and minimum of x-axis are including preset temperature range, by primary real
It tests after obtaining the curve, in the subsequent multiple measurement carried out by this test device, does not need repeatedly this step and ask
Calibration coefficient curve can be obtained pair each time to the detection of part to be measured by the calibration coefficient curve simulated
Then the calibration coefficient K answered can be acquired the temperature of each pixel unit of part to be measured by formula (2), be obtained to be measured
The temperature field on part surface.
It should be noted that the curve drawn in Fig. 4, is merely illustrative, the curve of actual calibration coefficient can
Can be entirely different with the curve in Fig. 4, but it is ensured that each preset target temperature value, can be in calibration
The value of corresponding COEFFICIENT K is found on number curve.The application does not carry out calibration coefficient curve any only to illustrate
It limits.
In addition, when more demanding to measurement accuracy, such as in 600 DEG C -1000 DEG C of preset temperature range, theoretically
Multiple experimental temperatures can be taken to be tested, to acquire more accurate calibration coefficient curve.It is commonly referred to as 600 in the art
DEG C or more temperature be high-temperature temperature, 1500 DEG C or more of temperature is hyperthermic temperature.
Compared with prior art, the present embodiment has the advantages that
One, before calculating part temperature field to be measured by color comparison temperature measurement formula, calibration coefficient curve is acquired by experiment, and
Corresponding calibration coefficient K is selected according to the target temperature of part to be measured in specific detection, can correct in two-color thermometry by
It is divided error caused by non-uniform factor etc. in wavelength bandwidth factor, factor, system by object under test approximation as black matrix,
Improve measurement accuracy；
Two, by passing through phase to each sub-regions in each sub-regions and target area three on target area one
Closing property calculation formula calculates the correlation of the two, it is ensured that the pixel unit on first object region and third target area
It is more accurate to carry out matched result；
Three, the present invention carries out temperature measurement using colorimetric method, and measurement range covers high temperature and superhigh temperature field, overcomes
Existing thermal infrared imager is unable to measure the defect of hyperthermic temperature field.
Embodiment 4:
The present embodiment provides a kind of temperature based on one camera on the basis of embodiment 1, embodiment 2 and embodiment 3
Field measurement system, related place can with the description of reference implementation example 1, embodiment 2 and embodiment 3, the present embodiment mainly for
With, for the matching process of each pixel unit on first object region and third target area, proposing other one in module
Kind solution, so that matching process is faster.
Fig. 5 is the signal to the matching process principle of each pixel unit on first object region and third target area
Figure, the dotted line between third target area 14 and the second target area 12 are symmetry axis.Referring to Figure 5, specifically, use with
Lower method matches each pixel unit on first object region 13 and third target area 14:
The coordinate of each mark point is substituted into following equation group, the whole of third target area is solved by equation group
Body image relative to first object region general image the first displacement U of X-direction, the second displacement V in Y direction,
And rotation angle, θ；
Wherein, N >=3, xi、yiFor the coordinate of i-th of mark point in first object region；
xi'、yi' for the third target area i-th of mark point coordinate；Same tag point refers on part to be measured
Obtain the same mark point, the mark point showed respectively in target area one and target area three.
This method is equivalent to that a plane is established in the plane of first object region 13 and the second target area 12 is straight
Angular coordinate system, and minimum only three mark points of needs, it can first object region 13 and the second target area 12 are carried out
Overall conversion can refer to 3 points of principles for determining a plane.By each mark point on third target area 14 relative to
Unique and rotation angle of the corresponding mark point in X-axis, Y-axis, can ask according to geometrical relationship on first object region 13
Third target area 14 is whole corresponding with first object region 13 by translation and rotation calculating, obtain third target area
Each pixel unit obtains corresponding relationship with each pixel unit on first object region 13 on 14.
It is provided in this embodiment based on single-phase compared to the temperature field measuring system based on one camera that embodiment 3 provides
In the temperature field measuring system of machine, matching process quicker can be obtained to first object area due to only needing three mark points
Each pixel unit is matched on domain 13 and third target area 14.
Embodiment 5:
The present embodiment provides a kind of based on single-phase on the basis of embodiment 1, embodiment 2, embodiment 3 and embodiment 4
The temperature field measurement method of machine, this method can carry out actual measurement to part to be measured and calculate part temperature field to be measured, wherein count
When calculating temperature field, needs to acquire calibration coefficient, various pieces will be described in detail below.
(1), by testing the method for acquiring calibration coefficient curve, calibration coefficient curve can be obtained with reference to shown in Fig. 3
Method flow diagram, comprising the following steps:
S101: the entrance window of measuring device described in the fire door face by blackbody furnace；
S102: it is stepped up the temperature of the blackbody furnace within the scope of default temperature, obtains a experimental temperature T1、
T2···Ta, wherein the target temperature value is located within the scope of the default temperature；
S103: for each experimental temperature, respectively taking pictures to the furnace wall of the blackbody furnace, obtains a referring to figure
Picture, wherein described to include the first reference object region and the second reference object region, first reference object area referring to image
Domain and second reference object region are in mirror；
S104: for, referring to image, making mirror to second target area using any straight line as axis described in each
As transformation, third reference object region is obtained, it will be on first reference object region and third reference object region
Each pixel unit matches one by one, each described experimental temperature is brought into respectively in the formula (1), finds out each institute
State the corresponding calibration coefficient K of experimental temperature；
S105: the calibration coefficient curve is formed using experimental temperature described in each and each calibration coefficient K.
In the temperature field measurement method based on one camera that the embodiment provides, when calculating calibration coefficient curve, use is black
Body furnace is tested, and in the case where known black matrix furnace temperature, is taken pictures with measuring device to blackbody furnace furnace wall, also with
Black matrix furnace temperature is substituted into the T of formula (1) kind, the experiment temperature can be obtained by two-color thermometry, experimental temperature known for one
The corresponding calibration coefficient K of degree, it is available since this method chooses multiple experimental temperatures within the scope of default temperature
The corresponding calibration coefficient K of multiple experimental temperatures, to obtain calibration coefficient curve.User is carrying out actual measurement to part to be measured
When, it obtains corresponding calibration coefficient K on calibration coefficient curve according to preset temperature first, recycles color comparison temperature measurement formula meter
Calculate the temperature field of part to be measured.
(2), the method for carrying out actual measurement to part to be measured and calculating part temperature field to be measured can be treated with reference to shown in Fig. 6
Part is surveyed to carry out actual measurement and calculate the method flow diagram in part temperature field to be measured.
It mainly comprises the steps that
S201: receiving the target temperature value that the part to be measured is heated, bent according to the target temperature value and calibration coefficient
Line determines calibration coefficient K；
S202: the image for the part to be measured that measuring device takes is received, wherein the image of the part to be measured includes mutual
For the first object region and the second target area of mirror；N number of mark point, the mark point are preset on the part to be measured
To be made to the part surface to be measured different from unmarked region degree of roughness before being shot to the part to be measured
Label；
More specifically, carrying out light filling using xenon lamp when taking pictures to the part to be measured with mark point.At mark point pair
The light degree of reflection through wave band of two selected narrow band filters has significant difference with the place not marked point, in this way
Could the image with mark point clearly be photographed using camera.
S203: mirror transformation is done to second target area using any straight line as axis, obtains third target area；
Since first object region and the second target area are mirror, third target is being obtained to the second target area mirror transformation
Behind region, third target area can be completely corresponding with first object region.
S204: by each pixel unit on the first object region and each on the third target area
Pixel unit is matched one by one, obtains all pixels unit in the first object region and the institute of the third target area
There is the corresponding relationship between pixel unit；
S205: pixel unit on the first object region described for one and with the pixel on the first object region
Pixel unit on the corresponding third target area of unit, is calculated using the following equation the temperature T of the pixel unit,
Wherein, C2Indicate second radiation constant, λ1、λ2Respectively indicate first optical filter and second optical filter
Central wavelength, η1、η2Camera is respectively indicated in λ1And λ2Spectral response value under wavelength, N1And N2Respectively indicate first object area
The gray value of a corresponding pixel unit on domain and the third target area, K is calibration coefficient, is specifically being demarcated
Corresponding calibration coefficient K is acquired according to the target temperature value of part to be measured in coefficient curve.
S206: the temperature of each pixel unit on the first object region is calculated separately by the formula (1)
Value, obtains the temperature field information of part to be measured.
It is the key step for the method that actual measurement is carried out to part to be measured and calculates part temperature field to be measured above, " by institute
It states each pixel unit on first object region and each pixel unit on the third target area carries out one by one
In the step of matching ", two kinds of specific matching process are present embodiments provided.
The first matching process, comprising the following steps:
First object region and third target area are respectively divided into p*q sub-regions, all wrapped in each sub-regions
Containing several mark points；Subregion is square and side length is 2M pixel, and M is positive integer；
Any one subregion in first object region is chosen as first object subregion；
Each of third target area subregion is successively chosen as third target subregion, using following formula meter
Calculate the correlation between third target subregion and first object subregion:
Wherein, C is the value of correlation, and the smaller expression correlation of C value is stronger, and f (x, y) and g (x', y') respectively indicate first
The coordinate of target subregion and third target subregion, fmAnd gmRespectively first object subregion and third target subregion
Average gray value；
The strongest third target subregion of correlation with first object subregion is chosen, is carried out with first object subregion
Matching, first object subregion central point and selected third target subregion central point are match point；
All subregions in all first object regions are successively chosen as first object subregion, are passed through formula (2)
It is matched with the third target subregion in third target area, obtains owning in first object region and third target area
The matching relationship of pixel unit.
By this method to each of each of first object region pixel and the second target area pixel into
Row matching need to use more mark point, therefore accuracy is also higher.
Second of matching process, comprising the following steps:
The coordinate of each mark point is substituted into following equation group, the whole of third target area is solved by equation group
Body image relative to first object region general image the first displacement U of X-direction, the second displacement V in Y direction,
And rotation angle, θ；
Wherein, N >=3, xi、yiFor the coordinate of i-th of mark point in first object region；
xi'、yi' for the third target area i-th of mark point coordinate；Same tag point refers on part to be measured
Obtain the same mark point, the mark point showed respectively in target area one and target area three.
According to the value of U, V and θ, it can be asked according to geometrical relationship and integrally calculate third target area by translation and rotation
It is corresponding with first object region, obtain each pixel unit and each picture on first object region on third target area
Plain unit obtains corresponding relationship.The pixel unit on first object region and the second target area is matched by this method,
Matching can be more quickly finished, compared to a upper matching process, time cost can be saved, reduce workload.
Although some specific embodiments of the invention are described in detail by example, the skill of this field
Art personnel it should be understood that example above merely to being illustrated, the range being not intended to be limiting of the invention.The skill of this field
Art personnel are it should be understood that can without departing from the scope and spirit of the present invention modify to above embodiments.This hair
Bright range is defined by the following claims.
Claims (7)
1. a kind of temperature field measuring system based on one camera, which is characterized in that including measuring device and computing device；
The measuring device includes entrance window, plate spectroscope, the first reflection microscope group, the second reflection microscope group, narrow band filter group
And camera；
The entrance window is one piece of transparent glass sheet, and the sheet glass is saturating to each optical filter institute in the narrow band filter group
The light transmission rate for crossing wave band is identical, the light issued for receiving part to be measured；Between the plate spectroscope and the entrance window
Angle be the first predetermined angle；The plate spectroscope is used to the light received from the entrance window being bisected into two beams complete
Exactly the same light beam one and light beam two；
The first reflection microscope group includes the first reflecting mirror and the second reflecting mirror, and first reflecting mirror is for receiving and reflecting institute
Light beam one is stated, second reflecting mirror is for receiving and reflecting the light beam two；First reflecting mirror and second reflection
Mirror is symmetrical about the plate spectroscope mirror surface, and the central point of the spectroscopical central point of the plate and first reflecting mirror
And the distance of the central point of second reflecting mirror is identical；
The second reflection microscope group includes third reflecting mirror and the 4th reflecting mirror, is respectively used to receive and reflect first reflection
The light beam one and the light beam two that microscope group reflects；And the folder between the third reflecting mirror and the 4th reflecting mirror
Angle is the second predetermined angle, and the opening of second predetermined angle is towards the plate spectroscope, the third reflecting mirror and described the
Four reflecting mirrors are symmetrical about the plate spectroscope mirror surface；
The narrow band filter group includes the first optical filter and the second optical filter, and it is anti-to be respectively used to receive the second reflection microscope group
The light beam one and the light beam two projected；First optical filter and second optical filter are generally aligned in the same plane and side by side
Setting reflects microscope group far from the spectroscopical side of the plate described second, and first optical filter and described second is filtered
Mating plate is symmetrical about the plate spectroscope mirror surface；First optical filter is different with the central wavelength of second optical filter,
And the absolute value of the difference of the central wavelength of first optical filter and the second optical filter is less than 150nm；First optical filter and
The central wavelength of second optical filter is all larger than 760nm；
Camera setting in the narrow band filter group far from the spectroscopical side of the plate, and the camera lens of the camera
The middle position of narrow band filter group described in face；The light beam one and the light beam two are by the first reflection microscope group, institute
The camera is injected after stating the second reflection microscope group and the narrow band filter group；
The computing device is used to calculate the temperature field on the part surface to be measured according to the image that the camera takes, comprising:
Temperature subscription module, image receiver module, matching module, temperature computation module；
The temperature subscription module for receiving the target temperature value that the part to be measured is heated, according to the target temperature value and
Calibration coefficient curve determines calibration coefficient K, wherein the calibration coefficient curve is the correlation curve of temperature and calibration coefficient；
Described image receiving module is used to receive the target image of the camera shooting, includes first object on the target image
Region and the second target area；The first object region is the corresponding virtual image of the light beam one；Second target area is
The corresponding virtual image of the light beam two；The first object region and second target area are in mirror；First mesh
Marking includes N number of mark point on region and second target area, and the mark point is to shoot to the part to be measured
Before, to the labels different from unmarked region degree of roughness of the part surface production to be measured；
The matching module is for executing following steps: doing mirror image change to second target area using any straight line as axis
It changes, obtains third target area；It will be on each pixel unit and the third target area on the first object region
Each pixel unit correspond；The pixel unit is pixel or sub-pix point；
The temperature computation module, described in corresponding one on the first object region and the third target area
Pixel unit is calculated using the following equation the corresponding temperature of the pixel unit on the part to be measured:
Wherein, C2Indicate second radiation constant, λ1、λ2It respectively indicates in first optical filter and second optical filter
Cardiac wave is long, η1、η2The camera is respectively indicated in λ1And λ2Spectral response value under wavelength, N1And N2Respectively indicate first mesh
The gray value of a corresponding pixel unit on region and the third target area is marked, K is the calibration coefficient.
2. the temperature field measuring system according to claim 1 based on one camera, which is characterized in that
Angle between the plate spectroscope and the entrance window is 45 °；
Angle between first reflecting mirror and second reflecting mirror and the plate spectroscope is respectively θ, the angle theta
Opening direction towards the entrance window side, and 0 ° < θ < 20 °.
3. the temperature field measuring system according to claim 1 based on one camera, which is characterized in that the temperature subscribes mould
Block determines the calibration coefficient curve using following methods:
The entrance window of measuring device described in fire door face by blackbody furnace；
It is stepped up the temperature of the blackbody furnace within the scope of default temperature, obtains a experimental temperature T1、T2···Ta,
In, the target temperature value is located within the scope of the default temperature；
It for each experimental temperature, takes pictures respectively to the furnace wall of the blackbody furnace, obtains a referring to image, wherein institute
Stating referring to image includes the first reference object region and the second reference object region, first reference object region and described the
Two reference object regions are in mirror；
For, referring to image, doing mirror transformation described in each to second target area using any straight line as axis, obtaining
To third reference object region, by each pixel on first reference object region and third reference object region
Unit matches one by one, each described experimental temperature is substituted into respectively in the formula (1), finds out each described experimental temperature
Corresponding calibration coefficient K；
The calibration coefficient curve is formed using experimental temperature described in each and each calibration coefficient K.
4. the temperature field measuring system according to claim 1 based on one camera, which is characterized in that
The matching module uses following steps by each pixel unit and the third mesh on the first object region
Each pixel unit marked on region corresponds:
The coordinate of each mark point is substituted into following equation group, goes out the third target area by the solving equations
The general image in domain relative to the first object region general image in the first displacement U of X-direction, in Y direction
Second displacement V and rotation angle, θ；
Wherein, N is the quantity of the mark point, and N >=3, xi、yiFor the seat of i-th of mark point in the first object region
Mark；
xi'、yi' for the third target area i-th of mark point coordinate；
According to the value of the first displacement U, the second displacement V and the rotation angle, θ, by geometrical relationship by described first
The position of each pixel unit on each pixel unit and the third target area on target area carries out one by one
Matching.
5. a kind of temperature field measurement method based on one camera, which comprises the following steps:
The target temperature value that part to be measured is heated is received, mark is determined according to the target temperature value and preset calibration coefficient curve
Determine COEFFICIENT K, wherein the calibration coefficient curve is the correlation curve of temperature and calibration coefficient；
Receive the image for the part to be measured that measuring device takes, wherein the image of the part to be measured is closed including mirror image each other
The first object region and the second target area of system；N number of mark point is preset on the part to be measured, the mark point is to institute
It states before part to be measured shot, to the labels different from unmarked region degree of roughness of the part surface production to be measured,
In, the measuring device is measuring device described in any one of Claims 1-4；
Mirror transformation is done to second target area using any straight line as axis, obtains third target area；
By each pixel unit on the first object region and each pixel unit on the third target area
It is matched one by one, obtains all pixels unit in the first object region and all pixels list of the third target area
Corresponding relationship between member, the pixel unit are pixel or sub-pix point；
Pixel unit on the first object region described for one and opposite with the pixel unit on the first object region
The pixel unit on the third target area answered, is calculated using the following equation the temperature T of the pixel unit,
Wherein, C2Indicate second radiation constant, λ1、λ2Respectively indicate the measuring device the first optical filter and the measurement
The central wavelength of second optical filter of device, η1、η2The camera of the measuring device is respectively indicated in λ1And λ2Spectrum under wavelength
Response, N1And N2Respectively indicate a corresponding pixel on the first object region and the third target area
The gray value of unit, K are the calibration coefficient；
The temperature value that each pixel unit on the first object region is calculated separately by the formula (1), obtains institute
State the temperature field of part to be measured.
6. the temperature field measurement method according to claim 5 based on one camera, which is characterized in that obtain by the following method
Obtain calibration coefficient curve:
The entrance window of measuring device described in fire door face by blackbody furnace；
It is stepped up the temperature of the blackbody furnace within the scope of default temperature, obtains a experimental temperature T1、T2···Ta,
In, the target temperature value is located within the scope of the default temperature；
It for each experimental temperature, takes pictures respectively to the furnace wall of the blackbody furnace, obtains a referring to image, wherein institute
Stating referring to image includes the first reference object region and the second reference object region, first reference object region and described the
Two reference object regions are in mirror；
For, referring to image, doing mirror image change to second reference object region using any straight line as axis described in each
It changes, obtains third reference object region, it will be each on first reference object region and third reference object region
A pixel unit matches one by one, each described experimental temperature is brought into respectively in the formula (1), finds out each described reality
Test the corresponding calibration coefficient K of temperature；
The calibration coefficient curve is formed using experimental temperature described in each and each calibration coefficient K.
7. the temperature field measurement method according to claim 5 based on one camera, which is characterized in that
By each pixel unit on the first object region and each pixel unit on the third target area
The step of being matched one by one include:
The coordinate of each mark point is substituted into following equation group, goes out the third target area by the solving equations
The general image in domain relative to the first object region general image in the first displacement U of X-direction, in Y direction
Second displacement V and rotation angle, θ；
Wherein, N is the quantity of the mark point, and N >=3, xi、yiFor the seat of i-th of mark point in the first object region
Mark；xi'、yi' for the third target area i-th of mark point coordinate；
According to the value of the first displacement U, the second displacement V and the rotation angle θ, by geometrical relationship by first mesh
The position for marking each pixel unit on region and each pixel unit on the third target area carries out one by one
Match.
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| CN110954222B (en) * | 2019-12-18 | 2020-11-03 | 北京理工大学 | Optimized temperature measurement method based on single-camera colorimetric temperature measurement system |
| CN111351578B (en) * | 2020-02-27 | 2021-08-06 | 北京理工大学 | Temperature measurement system and method based on pixelized dual-waveband narrow-band optical filter array |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476939A (en) * | 2009-02-12 | 2009-07-08 | 清华大学 | Double-CCD temperature field measuring apparatus and method |
| CN101487740A (en) * | 2009-02-12 | 2009-07-22 | 清华大学 | Three-CCD temperature field measuring apparatus and method |
| CN104568158A (en) * | 2014-11-25 | 2015-04-29 | 广东电网有限责任公司电力科学研究院 | Temperature field measurement device and method of heating surface under high-temperature smoke flow |
| CN107167249A (en) * | 2017-06-05 | 2017-09-15 | 北京理工大学 | One camera two waveband molten bath color comparison temperature measurement method and system |
| CN108225569A (en) * | 2017-12-31 | 2018-06-29 | 北京工业大学 | A kind of normal temperature method based on double spectral line characteristics |
-
2018
- 2018-07-13 CN CN201810769907.2A patent/CN108871585B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476939A (en) * | 2009-02-12 | 2009-07-08 | 清华大学 | Double-CCD temperature field measuring apparatus and method |
| CN101487740A (en) * | 2009-02-12 | 2009-07-22 | 清华大学 | Three-CCD temperature field measuring apparatus and method |
| CN104568158A (en) * | 2014-11-25 | 2015-04-29 | 广东电网有限责任公司电力科学研究院 | Temperature field measurement device and method of heating surface under high-temperature smoke flow |
| CN107167249A (en) * | 2017-06-05 | 2017-09-15 | 北京理工大学 | One camera two waveband molten bath color comparison temperature measurement method and system |
| CN108225569A (en) * | 2017-12-31 | 2018-06-29 | 北京工业大学 | A kind of normal temperature method based on double spectral line characteristics |
Non-Patent Citations (1)
| Title |
|---|
| 基于单台CCD的双波段比色测温方法;郝策等;《北京力学会第二十四届学术年会会议论文集》;20180228;第19-20页 |
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