CN105823575A - Calibration method and temperature measuring method for pixel-level thermochromic liquid crystals - Google Patents
Calibration method and temperature measuring method for pixel-level thermochromic liquid crystals Download PDFInfo
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- CN105823575A CN105823575A CN201610293607.2A CN201610293607A CN105823575A CN 105823575 A CN105823575 A CN 105823575A CN 201610293607 A CN201610293607 A CN 201610293607A CN 105823575 A CN105823575 A CN 105823575A
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- calibration element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
- G01K11/16—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials
- G01K11/165—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials of organic liquid crystals
Abstract
The invention relates to a calibration method and a temperature measuring method for pixel-level thermochromic liquid crystals. The calibration method includes the steps of: manufacturing a calibration part which is the same in shape and size as a part to be subjected to temperature measurement; spraying thermochromic liquid crystals on the calibration part; shooting pictures of the calibration part at different temperatures, and the position of the calibration part, the illumination intensity of the calibration part and the position of a device used for shooting relative to that of the calibration part being kept unchanged in a shooting process; and according to each picture obtained by shooting, determining a curve of a relation between temperature and a chromatic value of each pixel point in the calibration part, and using the relation curve as a calibration curve of the corresponding pixel point in the part to be subjected to temperature measurement. According to the calibration method, the position and illumination intensity of the calibration part and the position of the device used for shooting relative to that of the calibration part are kept unchanged in the shooting process when the calibration part is photographed, and the difference in the shooting position and illumination of the pictures can be eliminated, thereby improving the accuracy of thermochromic liquid temperature measurement.
Description
Technical field
The present invention relates to thermometry field, especially relate to scaling method and the thermometry of a kind of Pixel-level thermochromic liquid crystal.
Background technology
Thermochromic liquid crystal has the advantages such as response fast, spatial resolution high, contactless, real time temperature measurement, non-source test due to it, is therefore widely used in the thermometric of air stage combustion.Before using thermochromic liquid crystal to carry out thermometric, need it is demarcated.So-called demarcation utilizes camera to shoot the chromatic value of the thermochromic liquid crystal obtained and the relation of each known temperature exactly, then simulates the curve between colourity-temperature.During actual thermometric, utilize the chromatic value of the thermochromic liquid crystal of spraying on the measuring piece of camera shooting reality, then obtain the temperature value of correspondence according to the colourity-temperature curve of matching, it follows that the temperature of measuring piece.
At present, conventional thermochromic liquid crystal scaling method is single-point calibration, i.e. a measuring surface is only chosen a specific position, obtains the relation that the colourity of this position is corresponding with temperature, and fitted calibration curve, be used in the measurement of whole by this calibration curve.There may be the difference of camera shooting angle and illumination at timing signal, these differences will cause the presented different colourity of thermochromic liquid crystal, it will causes the error of thermochromic liquid crystal thermometric.
Summary of the invention
For disadvantages described above, the present invention provides scaling method and the thermometry of a kind of Pixel-level thermochromic liquid crystal, can eliminate the difference between the shooting angle of picture and illumination, improves the precision of thermochromic liquid crystal thermometric.
First aspect, the scaling method of the Pixel-level thermochromic liquid crystal that the present invention provides includes:
The calibration element that making is the most identical with the shape and size treating temperature measurement one；
Described calibration element sprays thermochromic liquid crystal；
Shoot described calibration element picture at different temperatures, and all keep constant in the intensity of illumination suffered by the position of calibration element described in shooting process, described calibration element and shooting equipment therefor relative to the position of described calibration element；
Each picture obtained according to shooting, determines the relation curve between temperature and the chromatic value of each pixel in described calibration element, and as described, this relation curve is treated the calibration curve of corresponding pixel points in temperature measurement one.
Optionally, on described calibration element, with described, the thickness of the thermochromic liquid crystal of spraying treats that the expection coating thickness of thermochromic liquid crystal on temperature measurement one is identical.
Optionally, the described calibration element of described shooting picture at different temperatures, including:
Heating described calibration element, regulation heating power is at different temperature, and shoots described calibration element picture at different temperatures.
Optionally, determine the relation curve between temperature and the chromatic value of each pixel in described calibration element, including:
Each pixel chromatic value at different temperatures in described calibration element is extracted from each picture that shooting obtains；
Chromatic value and temperature to each pixel carry out curve fitting, and obtain the relation curve between the temperature of each pixel and chromatic value.
Optionally, before shooting described calibration element picture at different temperatures, described method also includes:
Described calibration element is arranged on fixed support, and the position of shooting equipment therefor and the light fixture providing illumination is fixed.
Optionally, in determining described calibration element before relation curve between temperature and the chromatic value of each pixel, described method also includes:
Each picture photographed being carried out cutting, retains the coloured moiety of each pictures during cutting, the pixel quantity making each picture after cutting is identical.
Second aspect, the thermometry that the present invention provides includes that the scaling method described in any of the above, described method also include:
Treat to spray on temperature measurement one thermochromic liquid crystal described, and coating thickness is identical with the thickness of the thermochromic liquid crystal of spraying on described calibration element；
Treat the picture of temperature measurement one described in shooting, and treat that the position of temperature measurement one, suffered intensity of illumination, shooting equipment therefor and the described relative position treated between temperature measurement one and the position of described calibration element, suffered intensity of illumination, relative position between shooting equipment therefor and described calibration element are corresponding the most identical described in making during shooting；
The chromatic value of each pixel on temperature measurement one is treated described in extracting from the described picture treating temperature measurement one；
Chromatic value according to each pixel and calibration curve, determine the temperature of this pixel；
According to the temperature of each pixel, determine described in treat the temperature of temperature measurement one.
In the scaling method of the Pixel-level thermochromic liquid crystal that the present invention provides and thermometry, the relative invariant position kept in shooting process between the position of described calibration element, suffered intensity of illumination and shooting equipment therefor and calibration element is kept when calibration element is taken pictures, i.e. can eliminate the difference between the shooting angle of picture and illumination, improve the precision of thermochromic liquid crystal thermometric.And, relation curve between temperature and the chromatic value of each pixel in calibration element is determined, so that it is determined that treat the calibration curve of each pixel on temperature measurement one, relative to the mode of single-point calibration by the present invention, the probability producing error can be reduced, improve the precision of thermochromic liquid crystal thermometric.
Accompanying drawing explanation
By being more clearly understood from inventive feature information and advantage with reference to accompanying drawing, accompanying drawing is schematic and should not be construed as the present invention is carried out any restriction, in the accompanying drawings:
Fig. 1 shows the schematic flow sheet of scaling method one embodiment according to present invention pixel level thermochromic liquid crystal；
Fig. 2 shows the scheme of installation of the light fixture of calibration element in scaling method one embodiment according to present invention pixel level thermochromic liquid crystal, shooting equipment therefor and offer illumination；
1-calibration element；2-provides the light fixture of illumination；3-shoots equipment therefor；4-fixed support.
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, with detailed description of the invention, the present invention is further described in detail below in conjunction with the accompanying drawings.It should be noted that in the case of not conflicting, the feature in embodiments herein and embodiment can be mutually combined.
Elaborate a lot of detail in the following description so that fully understanding the present invention; but; the present invention can implement to use other to be different from other modes described here, and therefore, protection scope of the present invention is not limited by following public specific embodiment.
The present invention provides the scaling method of a kind of Pixel-level thermochromic liquid crystal, as it is shown in figure 1, the method includes:
S101, make and treat the calibration element that the shape and size of temperature measurement one are the most identical；
S102, on described calibration element spray thermochromic liquid crystal；
S103, shoot described calibration element picture at different temperatures, and all keep constant in the intensity of illumination suffered by the position of calibration element described in shooting process, described calibration element and shooting equipment therefor relative to the position of described calibration element；
S104, each picture obtained according to shooting, determine the relation curve between temperature and the chromatic value of each pixel in described calibration element, and as described, this relation curve treated the calibration curve of corresponding pixel points in temperature measurement one.
In the scaling method that the present invention provides, the relative invariant position kept in shooting process between the position of described calibration element, suffered intensity of illumination and shooting equipment therefor and calibration element is kept when calibration element is taken pictures, i.e. can eliminate the difference between the shooting angle of picture and illumination, improve the precision of thermochromic liquid crystal thermometric.And, relation curve between temperature and the chromatic value of each pixel in calibration element is determined, so that it is determined that treat the calibration curve of each pixel on temperature measurement one, relative to the mode of single-point calibration by the present invention, the probability producing error can be reduced, improve the precision of thermochromic liquid crystal thermometric.
In the specific implementation, on described calibration element, with described, the thickness of the thermochromic liquid crystal of spraying treats that the expection coating thickness of thermochromic liquid crystal on temperature measurement one is identical as far as possible, such that it is able to eliminate due to calibration element and treat the error that temperature measurement one causes due to the difference in thickness of thermochromic liquid crystal, improve the precision of thermochromic liquid crystal thermometric further.
In the specific implementation, the detailed process shooting described calibration element picture at different temperatures in S103 may include that
Heating described calibration element, regulation heating power is at different temperature, and shoots described calibration element picture at different temperatures.
Certainly, it should shoot again after the temperature stabilization of calibration element as far as possible.
In the specific implementation, S104 determining, the process of the relation curve between temperature and the chromatic value of each pixel in described calibration element can specifically include not shown in figure:
S1041, from each picture of obtaining of shooting, extract each pixel chromatic value at different temperatures in described calibration element；
S1042, chromatic value and temperature to each pixel carry out curve fitting, and obtain the relation curve between the temperature of each pixel and chromatic value.
Here, by the way of matching, obtain the relation curve between the temperature of each pixel and chromatic value, simple, convenient.Furthermore, it is possible to use the pixel value of RGB-HSV each pixel of formulas Extraction.
In the specific implementation, before shooting described calibration element picture at different temperatures in S103, with reference to Fig. 2, the scaling method that the present invention provides can also include:
Described calibration element 1 is arranged on fixed support 4, and the position of shooting equipment therefor 3 and the light fixture 2 providing illumination is fixed.
Here to calibration element, shooting equipment therefor, provide the light fixture of illumination to carry out position and fix, in order to follow-up in whole shooting process shooting angle keep constant.
In the specific implementation, before determining the relation curve between temperature and the chromatic value of each pixel in described calibration element in S104, the scaling method that the present invention provides can also include:
Each picture photographed being carried out cutting, retains the coloured moiety of each pictures during cutting, the pixel quantity making each picture after cutting is identical.
Here by the mode of cutting, obtain the picture of one group of same pixel size at different temperatures, in order to follow-up chromatic value extraction work.
Second aspect, the present invention also provides for a kind of thermometry, and the method includes any of the above scaling method, and thermometry also includes not shown in figure:
S105, treat to spray on temperature measurement one thermochromic liquid crystal described, and coating thickness is identical with the thickness of thermochromic liquid crystal sprayed on described calibration element；
Treat the picture of temperature measurement one described in S106, shooting, and treat that the position of temperature measurement one, suffered intensity of illumination, shooting equipment therefor and the described relative position treated between temperature measurement one and the position of described calibration element, suffered intensity of illumination, relative position between shooting equipment therefor and described calibration element are corresponding the most identical described in making during shooting；
S107, from the described picture treating temperature measurement one extract described in treat the chromatic value of each pixel on temperature measurement one；
S108, according to the chromatic value of each pixel and calibration curve, determine the temperature of this pixel；
S109, temperature according to each pixel, determine described in treat the temperature of temperature measurement one.
In the thermometry that the present invention provides, shooting when temperature measurement one until the position of temperature measurement one, suffered intensity of illumination, shoot equipment therefor and the relative position between temperature measurement one and shooting calibration element time the position of calibration element, suffered intensity of illumination, relative position between shooting equipment therefor and calibration element corresponding the most identical, eliminate at timing signal different, to improve thermometric precision with the chromatic value that same pixel when measuring causes due to the difference such as camera shooting angle, illumination at the same temperature.
Although being described in conjunction with the accompanying embodiments of the present invention, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, within the scope of such amendment and modification each fall within and be defined by the appended claims.
Claims (7)
1. the scaling method of a Pixel-level thermochromic liquid crystal, it is characterised in that including:
The calibration element that making is the most identical with the shape and size treating temperature measurement one；
Described calibration element sprays thermochromic liquid crystal；
Shoot described calibration element picture at different temperatures, and all keep constant in the intensity of illumination suffered by the position of calibration element described in shooting process, described calibration element and shooting equipment therefor relative to the position of described calibration element；
Each picture obtained according to shooting, determines the relation curve between temperature and the chromatic value of each pixel in described calibration element, and as described, this relation curve is treated the calibration curve of corresponding pixel points in temperature measurement one.
Scaling method the most according to claim 1, it is characterised in that with described, the thickness of the thermochromic liquid crystal of spraying treats that the expection coating thickness of thermochromic liquid crystal on temperature measurement one is identical on described calibration element.
Scaling method the most according to claim 1, it is characterised in that the described calibration element of described shooting picture at different temperatures, including:
Heating described calibration element, regulation heating power is at different temperature, and shoots described calibration element picture at different temperatures.
Scaling method the most according to claim 1, it is characterised in that determine the relation curve between temperature and the chromatic value of each pixel in described calibration element, including:
Each pixel chromatic value at different temperatures in described calibration element is extracted from each picture that shooting obtains；
Chromatic value and temperature to each pixel carry out curve fitting, and obtain the relation curve between the temperature of each pixel and chromatic value.
Scaling method the most according to claim 1, it is characterised in that before shooting described calibration element picture at different temperatures, described method also includes:
Described calibration element is arranged on fixed support, and the position of shooting equipment therefor and the light fixture providing illumination is fixed.
Scaling method the most according to claim 1, it is characterised in that in determining described calibration element before relation curve between temperature and the chromatic value of each pixel, described method also includes:
Each picture photographed being carried out cutting, retains the coloured moiety of each pictures during cutting, the pixel quantity making each picture after cutting is identical.
7. a thermometry, it is characterised in that including the arbitrary described scaling method of claim 1-6, described method also includes:
Treat to spray on temperature measurement one thermochromic liquid crystal described, and coating thickness is identical with the thickness of the thermochromic liquid crystal of spraying on described calibration element；
Treat the picture of temperature measurement one described in shooting, and treat that the position of temperature measurement one, suffered intensity of illumination, shooting equipment therefor are distinguished corresponding the most identical with the position of described calibration element, suffered intensity of illumination, shooting equipment therefor relative to the position of described calibration element relative to the position of described calibration element described in making during shooting；
The chromatic value of each pixel on temperature measurement one is treated described in extracting from the described picture treating temperature measurement one；
Chromatic value according to each pixel and calibration curve, determine the temperature of this pixel；
According to the temperature of each pixel, determine described in treat the temperature of temperature measurement one.
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| CN201610293607.2A CN105823575B (en) | 2016-05-05 | 2016-05-05 | The scaling method and thermometry of Pixel-level thermochromic liquid crystal |
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Cited By (6)
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| CN106679848A (en) * | 2017-03-27 | 2017-05-17 | 成都天衡电科科技有限公司 | Method for fast measuring temperature by using normal temperature sensor |
| CN106706155A (en) * | 2016-11-30 | 2017-05-24 | 维沃移动通信有限公司 | Temperature detection method and device |
| CN108303194A (en) * | 2018-01-11 | 2018-07-20 | 南京航空航天大学 | A kind of revolving part temperature measuring equipment and method based on thermochromic liquid crystal |
| CN108982577A (en) * | 2018-06-25 | 2018-12-11 | 浙江大学 | Composite phase-change material fusing/process of setting phase boundary gauge and method based on thermochromic liquid crystal |
| CN109603941A (en) * | 2019-01-11 | 2019-04-12 | 京东方科技集团股份有限公司 | Micro-fluidic chip system and micro-fluidic chip |
| CN113008405A (en) * | 2021-03-09 | 2021-06-22 | 云南中烟工业有限责任公司 | Chrominance feedback temperature measuring device and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706155A (en) * | 2016-11-30 | 2017-05-24 | 维沃移动通信有限公司 | Temperature detection method and device |
| CN106679848A (en) * | 2017-03-27 | 2017-05-17 | 成都天衡电科科技有限公司 | Method for fast measuring temperature by using normal temperature sensor |
| CN108303194A (en) * | 2018-01-11 | 2018-07-20 | 南京航空航天大学 | A kind of revolving part temperature measuring equipment and method based on thermochromic liquid crystal |
| CN108982577A (en) * | 2018-06-25 | 2018-12-11 | 浙江大学 | Composite phase-change material fusing/process of setting phase boundary gauge and method based on thermochromic liquid crystal |
| CN108982577B (en) * | 2018-06-25 | 2020-06-16 | 浙江大学 | Phase interface measuring device and method for melting/solidifying process of composite phase change material based on thermochromatic liquid crystal |
| CN109603941A (en) * | 2019-01-11 | 2019-04-12 | 京东方科技集团股份有限公司 | Micro-fluidic chip system and micro-fluidic chip |
| CN113008405A (en) * | 2021-03-09 | 2021-06-22 | 云南中烟工业有限责任公司 | Chrominance feedback temperature measuring device and method |
| CN113008405B (en) * | 2021-03-09 | 2024-03-22 | 云南中烟工业有限责任公司 | Chroma feedback temperature measuring device and method |
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Effective date of registration: 20211021 Address after: 1701-3, block a, building 1, No. 10, Ronghua Middle Road, Beijing Economic and Technological Development Zone, Daxing District, Beijing 100176 Patentee after: Beijing Feiqing Technology Co.,Ltd. Address before: 100191 No. 37, Haidian District, Beijing, Xueyuan Road Patentee before: BEIHANG University |
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