CN114112099A - Temperature measurement method and system based on plane laser-induced fluorescence measurement device - Google Patents
Temperature measurement method and system based on plane laser-induced fluorescence measurement device Download PDFInfo
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Abstract
The invention relates to a temperature measurement method and a temperature measurement system based on a plane laser-induced fluorescence measurement device, wherein the temperature measurement method comprises the following steps: acquiring a fluorescence light field ratio image related to a combustion field based on a planar laser induced fluorescence measuring device; dividing the fluorescence light field ratio image into a plurality of regions, and selecting a plurality of calibration positions in each region; acquiring the corresponding actual temperature of each calibration position in the combustion field; determining the calibration temperature of each area according to the corresponding actual temperature of each calibration position in the combustion field; and respectively calculating the temperature value corresponding to the ratio of the fluorescence light field of each pixel point in each region by using the calibration temperature of each region. According to the invention, the fluorescence light field ratio image is divided into a plurality of areas, the calibration temperature of each area is determined in a multi-point measurement mode in the plurality of areas, and the temperature value corresponding to the fluorescence light field ratio of the pixel point is determined on the basis of the calibration temperature, so that the temperature of each position of the combustion field is comprehensively and accurately measured.
Description
Technical Field
The invention relates to the technical field of combustion field monitoring, in particular to a temperature measurement method and system based on a plane laser-induced fluorescence measurement device.
Background
In the field of aerospace, gunpowder is used as an important component in the field of aerospace, and parameters such as temperature, combustion conditions and the like have important significance in the combustion process of the gunpowder. However, the temperature of different flame positions is different in the combustion process of gunpowder, the measurement of a certain number of positions can only be realized by adopting the conventional temperature measuring device, and the comprehensive measurement of the whole combustion field of the gunpowder combustion cannot be realized.
Disclosure of Invention
The invention aims to provide a temperature measuring method and a temperature measuring system based on a plane laser-induced fluorescence measuring device, so as to realize comprehensive measurement of the whole combustion field of gunpowder combustion.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a temperature measurement method based on a plane laser induced fluorescence measurement device, which comprises the following steps:
acquiring a fluorescence light field ratio image related to a combustion field based on a planar laser induced fluorescence measuring device;
dividing the fluorescence light field ratio image into a plurality of regions, and selecting a plurality of calibration positions in each region;
acquiring the corresponding actual temperature of each calibration position in the combustion field;
determining the calibration temperature of each region according to the corresponding actual temperature of each calibration position in the combustion field;
and respectively calculating the temperature value corresponding to the ratio of the fluorescence light field of each pixel point in each region by using the calibration temperature of each region to obtain the two-dimensional temperature field of the combustion field.
Optionally, the step of respectively calculating a temperature value corresponding to a ratio of the fluorescent light field of each pixel point in each of the regions by using the calibration temperature of each of the regions to obtain a two-dimensional temperature field of the combustion field specifically includes:
calculating the mean value of the ratio of the fluorescent light fields of the pixel points of each region to obtain the mean value of the ratio image of the fluorescent light fields of each region;
according to the calibration temperature of each region and the mean value of the ratio image of the fluorescence light field, using a formula
Calculating a relation coefficient of each region; the relation coefficient is used for representing the relation between the ratio of the fluorescent light field and the temperature value;
wherein, CiA relation coefficient, r, representing the ith areaiMean value of the fluorescence light field ratio image, t, representing the ith areaiDenotes the nominal temperature, I, of the I-th zone1And I2Respectively representing the energy of the laser with two wavelengths, delta E, emitted when the planar laser-induced fluorescence measuring device obtains the fluorescence light field ratio image12The energy level difference of the two excitation lines is shown, and k is the boltzmann constant.
Using a formula based on the relation coefficient of each of said regions
Calculating a temperature value corresponding to the ratio of the fluorescence light field of each pixel point of each region to obtain a two-dimensional temperature field of the combustion field;
wherein R isiRepresenting the ratio of the fluorescent light field of the i-th region, TiAnd representing the temperature value corresponding to the ratio of the fluorescence light field of the ith area.
Optionally, the acquiring an actual temperature of each calibration position in the combustion field specifically includes:
determining a corresponding position of each of the calibration positions in the combustion field;
acquiring the actual temperature of each corresponding position; the actual temperature is measured by a combustion field temperature measuring device; the combustion field temperature measuring device can measure and obtain the actual temperature of each corresponding position in the combustion field through position adjustment.
A temperature measurement system based on a planar laser-induced fluorescence measurement device, the temperature measurement system comprising: the device comprises a plane laser induced fluorescence measuring device, a combustion field temperature measuring device and a temperature field acquiring device;
the plane laser induced fluorescence measuring device is used for measuring a fluorescence light field ratio image related to the combustion field and sending the fluorescence light field ratio image of the combustion field to a fluorescence light field ratio image acquisition unit of the temperature field acquisition device;
the temperature field acquisition device includes:
a fluorescent light field ratio image acquisition unit for acquiring a fluorescent light field ratio image with respect to the combustion field;
the calibration position selecting unit is used for dividing the fluorescence light field ratio image into a plurality of areas and selecting a plurality of calibration positions in each area;
the actual temperature acquisition unit is used for acquiring the actual temperature corresponding to each calibration position in the combustion field;
the calibration temperature determining unit is used for determining the calibration temperature of each region according to the corresponding actual temperature of each calibration position in the combustion field;
the two-dimensional temperature field acquisition unit is used for respectively calculating temperature values corresponding to the ratio of the fluorescence light fields of the pixel points of each region by using the calibration temperature of each region to obtain a two-dimensional temperature field of the combustion field;
the combustion field temperature measuring device is used for measuring the actual temperature corresponding to each calibration position in the combustion field and sending the actual temperature corresponding to each calibration position in the combustion field to the actual temperature obtaining unit.
Optionally, the combustion field temperature measuring device includes a thermocouple temperature measuring device and a lifting translation stage device;
the lifting translation table device is used for adjusting the position of the thermocouple temperature measuring device so as to measure the actual temperature of the combustion field corresponding to each calibration position;
the lifting translation stage device comprises: a lifting platform and a translation platform;
the fixed part of the translation table is fixed on the lifting table through a pressing plate, and the thermocouple temperature measuring device is arranged on the moving part of the translation table.
Optionally, the thermocouple temperature measuring device includes a thermocouple and a data thermometer;
the signal output end of the thermocouple is connected with the data thermometer, and the thermocouple is arranged on the moving part.
Optionally, the thermocouple temperature measuring device further includes: the thermocouple fixing component comprises a thermocouple fixing component, a support rod and a fixing base;
the thermocouple is fixed at one end of the supporting rod through the thermocouple fixing part, the other end of the supporting rod is fixed on the fixed base, and the fixed base is arranged on the moving part.
Optionally, one side of the lifting platform is provided with a vertically placed standard ruler, two adjacent side faces of the lifting platform are provided with two horizontally placed standard rulers, and the two horizontally placed standard rulers are perpendicular to each other.
A combustion field temperature measurement device, the combustion field temperature measurement device: a thermocouple temperature measuring device and a lifting translation platform device;
the lifting translation table device is used for adjusting the thermocouple temperature measuring device to measure the actual temperature of the combustion field corresponding to each calibration position;
the lifting translation stage device comprises: a lifting platform and a translation platform;
the fixed part of the translation table is fixed on the lifting table through a pressing plate, and the thermocouple temperature measuring device is arranged on the moving part of the translation table.
A temperature field acquisition device.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a temperature measurement method and a temperature measurement system based on a plane laser induced fluorescence measurement device, wherein the temperature measurement method comprises the following steps: acquiring a fluorescence light field ratio image related to a combustion field based on a planar laser induced fluorescence measuring device; dividing the fluorescence light field ratio image into a plurality of regions, and selecting a plurality of calibration positions in each region; acquiring the corresponding actual temperature of each calibration position in the combustion field; determining the calibration temperature of each region according to the corresponding actual temperature of each calibration position in the combustion field; and respectively calculating the temperature value corresponding to the ratio of the fluorescence light field of each pixel point in each region by using the calibration temperature of each region to obtain the two-dimensional temperature field of the combustion field. According to the invention, the fluorescence light field ratio image is divided into a plurality of areas, the calibration temperature of each area is determined in a multi-point measurement mode in the plurality of areas, and the temperature value corresponding to the fluorescence light field ratio of the pixel point is determined on the basis of the calibration temperature, so that the temperature of each position of the combustion field is comprehensively and accurately measured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a flowchart of a temperature measurement method based on a planar laser-induced fluorescence measurement apparatus according to embodiment 1 of the present invention;
fig. 2 is a structural view of a combustion field temperature measuring apparatus provided in embodiment 2 of the present invention;
fig. 3 is a structural diagram of a planar laser-induced fluorescence measurement apparatus provided in embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a temperature measuring method and a temperature measuring system based on a plane laser-induced fluorescence measuring device, so as to realize comprehensive measurement of the whole combustion field of gunpowder combustion.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The planar laser induced fluorescence technology adopts pulse laser with specific wavelength to excite a rotation energy level transition line of a certain combustion field on the same vibration energy level, two groups of fluorescence signals are obtained by repeating two operations, the fluorescence signal intensity ratio corresponding to two wavelengths is calculated, and then the two-dimensional flame temperature is deduced according to the fluorescence signal intensity ratio and the Boltzmann distribution of the particle numbers of different rotation energy levels. And the fluorescence light field image of the combustion field can be obtained based on the planar laser induced fluorescence technology, so that the comprehensive temperature measurement of the combustion field can be realized based on the planar laser induced fluorescence measuring device.
Example 1
As shown in fig. 1, the present invention further provides a temperature measurement method based on the planar laser-induced fluorescence measurement apparatus, wherein the temperature measurement method comprises the following steps:
Exciting the same combustion field by different wavelengths to obtain a fluorescence light field image F through an image acquisition system1、F2And obtaining a fluorescence light field ratio image by using the formula (1).
Wherein R is a fluorescence optical field ratio image, F1、F2Is a fluorescent light field image.
And 103, acquiring actual temperature corresponding to each calibration position in the combustion field.
One side of the thermocouple tip of the combustion field temperature measuring device is arranged at the lowest end of the leftmost end of the combustion field, and after the temperature is fixed and read, the lifting platform of the lifting translation platform device and the knob on the translation platform are rotated by taking the standard straight scale as a reference, so that the temperature values of a plurality of calibration positions are sequentially obtained.
The acquiring of the actual temperature corresponding to each calibration position in the combustion field specifically includes:
determining a corresponding position of each of the calibration positions in the combustion field; specifically, a space coordinate system of the combustion field is constructed by taking a measurement origin of the combustion field temperature measuring device as a coordinate origin, taking the lifting direction of a lifting table of the combustion field temperature measuring device as a y-axis and taking the horizontal direction of a translation table as an x-axis; and the measurement origin is the initial positions of the lifting platform and the translation platform. And establishing a plane coordinate system of the fluorescence light field ratio image by taking the corresponding position of the measurement origin in the fluorescence light field ratio image as a coordinate origin. And determining the corresponding position of each calibration position in the space coordinate system by adopting a coordinate conversion mode according to the coordinate of each calibration position in the plane coordinate system.
Acquiring the actual temperature of each corresponding position; the actual temperature is measured by a combustion field temperature measuring device; the combustion field temperature measuring device can measure and obtain the actual temperature of each corresponding position in the combustion field through position adjustment; specifically, the lifting platform and the translation platform of the combustion field temperature measuring device are adjusted, the temperature measuring point of the thermocouple temperature measuring device of the combustion field temperature measuring device is moved to each corresponding position, and the actual temperature corresponding to each calibration position in the combustion field is measured.
And 104, determining the calibration temperature of each region according to the corresponding actual temperature of each calibration position in the combustion field.
The calibration temperature of each region is determined by calculating the average value of the corresponding actual temperatures of all the calibration positions in each region in the combustion field.
And 105, respectively calculating a temperature value corresponding to the ratio of the fluorescence light field of each pixel point in each region by using the calibration temperature of each region, and obtaining a two-dimensional temperature field of the combustion field.
and calculating the mean value of the ratio of the fluorescence light fields of the pixel points of each region to obtain the mean value of the ratio image of the fluorescence light fields of each region.
And (3) calculating the relation coefficient of each region by using a formula (2) according to the calibration temperature of each region and the mean value of the ratio image of the fluorescence light field. The relation coefficient is used for representing the relation between the ratio of the fluorescence light field and the temperature value.
Wherein, CiA relation coefficient, r, representing the ith areaiMean value of the fluorescence light field ratio image, t, representing the ith areaiDenotes the nominal temperature, I, of the I-th zone1And I2Respectively representing the energy of the laser with two wavelengths emitted in the temperature measurement process of the plane laser-induced fluorescence measuring device, delta E12The energy level difference of the two excitation lines is shown, and k is the boltzmann constant.
Calculating a temperature value corresponding to the ratio of the fluorescence light field of each region by using a formula (3) according to the relation coefficient of each region to obtain a two-dimensional temperature field of the combustion field;
wherein R isiRepresenting the ratio of the fluorescent light field of the i-th region, TiIndicating the temperature of the ith zone.
Example 2
The invention also provides a temperature measurement system based on the plane laser induced fluorescence measurement device, which comprises: the device comprises a plane laser induced fluorescence measuring device, a combustion field temperature measuring device and a temperature field acquiring device; the plane laser induced fluorescence measuring device is used for measuring a fluorescence light field ratio image related to the combustion field and sending the fluorescence light field ratio image of the combustion field to a fluorescence light field ratio image acquisition unit of the temperature field acquisition device; the temperature field acquisition device includes: a fluorescent light field ratio image acquisition unit for acquiring a fluorescent light field ratio image with respect to the combustion field; the calibration position selecting unit is used for dividing the fluorescence light field ratio image into a plurality of areas and selecting a plurality of calibration positions in each area; the actual temperature acquisition unit is used for acquiring and acquiring the actual temperature corresponding to each calibration position in the combustion field; the calibration temperature determining unit is used for determining the calibration temperature of each region according to the corresponding actual temperature of each calibration position in the combustion field; the two-dimensional temperature field acquisition unit is used for respectively calculating temperature values corresponding to the ratio of the fluorescence light fields of the pixel points of each region by using the calibration temperature of each region to obtain a two-dimensional temperature field of the combustion field; the combustion field temperature measuring device is used for measuring the actual temperature corresponding to each calibration position in the combustion field and sending the actual temperature corresponding to each calibration position in the combustion field to the actual temperature obtaining unit.
As shown in fig. 2, the combustion field temperature measuring device of the present invention includes a thermocouple temperature measuring device and a lifting translation stage device, wherein: the thermocouple temperature measuring device comprises a thermocouple 1, a thermocouple fixing part 2, a support rod 3, a fixing base 4 and a data thermometer 5 which are connected in sequence; the thermocouple 1 is fixed on the thermocouple fixing part 2, the thermocouple fixing part 2 is fixed on the supporting rod 3, the supporting rod 3 is fixed on the fixing base 4, and the tail end of the thermocouple 1 is connected with the data thermometer 5.
The lifting translation platform device comprises a lifting platform 6, a standard ruler 7, a translation platform 8 and a pressing plate 9; the vertical standard ruler 7 of putting in elevating platform 6 one side, translation platform 8 is fixed on elevating platform 6, is fixed by clamp plate 9, and two-dimensional temperature field calibration device fixes on translation platform 8, and two adjacent sides of translation platform 8 are the level respectively and are put two standard rulers 7, and two standard rulers 7 mutually perpendicular that the level was put, four directions of two-dimensional temperature field calibration device are fixed to clamp plate 9.
Wherein, the thermocouple 1 adopts a B type platinum rhodium thermocouple.
The thermocouple fixing part 2 is cylindrical, the radius of the bottom of the thermocouple fixing part is 2.5cm, the height of the thermocouple fixing part is 1.5cm, the axis direction of the cylinder is provided with through hole threads, the type of the threads is NPT 3/8, one side of a cylindrical rotating surface is a plane, the size of the plane is 1.5cm multiplied by 1.5cm, the center of the plane is provided with blind hole threads, and the type of the threads is M6.
The supporting rod 3 adopts a supporting rod with external threads M6. The fixed base 4 adopts an integral British rod rack base. The data thermometer 5 adopts a Bluetooth data thermometer. The lifting platform 6 adopts a scissor type lifting platform. The translation stage 8 is a biaxial linear translation stage.
As shown in fig. 3, the planar laser-induced fluorescence measuring device is configured to emit two lasers with different wavelengths to the combustion field twice, obtain fluorescence light field images of the combustion field under excitation of the two lasers with different wavelengths, and calculate a ratio of the fluorescence light field images under excitation of the two lasers to obtain a fluorescence light field ratio image related to the combustion field, and includes a first laser a, a second laser B, a frequency multiplier C, a first reflector D, a second reflector E, a sheet light shaping system F, a planar furnace (to-be-measured combustion field) G, and an image acquisition system H;
the image acquisition system H acquires the fluorescence image of the plane furnace (combustion field to be measured) G to obtain two fluorescence light field images with different wavelengths. And calculating the ratio of the two fluorescence images with different wavelengths to obtain a fluorescence light field ratio image.
The temperature field acquisition device can be realized in a software-based mode, a hardware-based mode and a software and hardware-based mode.
Example 3
As shown in fig. 2, the combustion field temperature measuring device of the present invention includes a thermocouple temperature measuring device and a lifting translation stage device, wherein: the thermocouple temperature measuring device comprises a thermocouple 1, a thermocouple fixing part 2, a support rod 3, a fixing base 4 and a data thermometer 5 which are connected in sequence; the thermocouple 1 is fixed on the thermocouple fixing part 2, the thermocouple fixing part 2 is fixed on the supporting rod 3, the supporting rod 3 is fixed on the fixing base 4, and the tail end of the thermocouple 1 is connected with the data thermometer 5.
The lifting translation platform device comprises a lifting platform 6, a standard ruler 7, a translation platform 8 and a pressing plate 9; the vertical standard ruler 7 of putting in elevating platform 6 one side, translation platform 8 is fixed on elevating platform 6, is fixed by clamp plate 9, and two-dimensional temperature field calibration device fixes on translation platform 8, and two adjacent sides of translation platform 8 are the level respectively and are put two standard rulers 7, and two standard rulers 7 mutually perpendicular that the level was put, four directions of two-dimensional temperature field calibration device are fixed to clamp plate 9.
Example 4
A storage medium having stored thereon executable instructions which, when executed by a processor, carry out the steps of the thermometry method of embodiment 1.
Example 5
The following specific embodiments are provided to illustrate the practice of the invention.
Establishing a rectangular coordinate system by using the lower left corner of the fluorescence light field ratio image, and taking the lower left corner of the fluorescence light field ratio image as a coordinate origin;
setting the length of the fluorescence light field ratio image as X, averagely dividing the length of the fluorescence light field ratio image into m parts, wherein the length of each fluorescence image is X;
thirdly, enabling the abscissa on the abscissa axis to be 0, x, 2x, … and mx in sequence;
setting the width of the fluorescence light field ratio image as Y, averagely dividing the width of the fluorescence light field ratio image into n parts, wherein the width of each part of fluorescence image is Y;
fifthly, sequentially setting the ordinate on the ordinate axis as 0, y, 2y, … and ny;
step six, sequentially connecting [ (m-1) x, ny ], (mx, ny), [ mx, (n-1) y ], [ (m-1) x, (n-1) y ] on coordinate axes to form a rectangular area, and enabling the rectangular area to be { m, n };
seventhly, setting five points of [ (m-1) x, ny ], (mx, ny), [ mx, (n-1) y ], [ (m-1) x, (n-1) y ], [ (m-0.5) x, (n-0.5) y ] as temperature points to be detected in a rectangular area { m, n };
step eight, sequentially measuring five temperature values of [ (m-1) x, ny ], (mx, ny), [ mx, (n-1) y ], [ (m-1) x, (n-1) y ], [ (m-0.5) x, (n-0.5) y ];
step nine, substituting the obtained temperature value into a formula
t{m,n}＝{t[(m-1)x,ny]+t(mx,ny)+t[mx，(n-1)y]+t[(m-1)x，(n-1)y]+t[(m-0.5)x，(n-0.5)y]}/5 (4)
And obtaining the calibrated temperature value of the rectangular area m, n.
In the formula, t{m,n}Calibrated temperature value, t, for rectangular region { m, n }(mx,ny)Is the temperature value of the temperature point to be measured.
Rectangular region m, n all imagesThe average of the pixel points is taken as the mean value of the ratio image of the rectangular area { m, n } fluorescence light field, and is named as r{m，n}。
Step ten, utilizing a formula
The relation coefficient of the rectangular area m, n is obtained.
In the formula, C{m,n}Is the relation coefficient, r, of the rectangular region { m, n }{m,n}Is the mean value, I, of the ratio image of the m, n fluorescence light field of a rectangular area1And I2For two wavelengths of laser energy, Δ E12Is the energy level difference of two excitation lines, k is Boltzmann constant, t{m,n}Is the calibrated temperature value of the rectangular region m, n.
Eleven steps of utilizing a formula
The temperature field of the rectangular region m, n is obtained.
In the formula, T{m,n}Temperature field of rectangular region { m, n }, C{m,n}Is the relation coefficient, r, of the rectangular region { m, n }{m,n}Is a rectangular region { m, n } fluorescence light field ratio image, I1And I2For two wavelengths of laser energy, Δ E12K is the boltzmann constant, which is the energy level difference between the two excitation lines.
Step twelve, using formula
And obtaining a two-dimensional temperature field of the combustion field.
Wherein T is a combustion field two-dimensional temperature field, T{m,n}Is the temperature field of the rectangular region m, n.
The invention utilizes Plane Laser Induced Fluorescence (PLIF) technology under different wavelengths to obtain fluorescence light field images for regional processing, measures the temperature of selected points in each region, takes the average temperature value as the calibrated temperature value in the region, obtains the temperature field image of the region by utilizing the fluorescence light field ratio image and the calibrated temperature value inversion of each region, and then synthesizes all the temperature field images into a complete temperature field image. This allows for a reduction in process error in obtaining the temperature field and an improvement in accuracy over prior methods.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A temperature measurement method based on a plane laser induced fluorescence measurement device is characterized by comprising the following steps:
acquiring a fluorescence light field ratio image related to a combustion field based on a planar laser induced fluorescence measuring device;
dividing the fluorescence light field ratio image into a plurality of regions, and selecting a plurality of calibration positions in each region;
acquiring the corresponding actual temperature of each calibration position in the combustion field;
determining the calibration temperature of each region according to the corresponding actual temperature of each calibration position in the combustion field;
and respectively calculating the temperature value corresponding to the ratio of the fluorescence light field of each pixel point in each region by using the calibration temperature of each region to obtain the two-dimensional temperature field of the combustion field.
2. The temperature measurement method based on the planar laser induced fluorescence measurement device according to claim 1, wherein the step of obtaining the two-dimensional temperature field of the combustion field by respectively calculating the temperature value corresponding to the ratio of the fluorescence light field of each pixel point in each region by using the calibration temperature of each region specifically comprises:
calculating the mean value of the ratio of the fluorescent light fields of the pixel points of each region to obtain the mean value of the ratio image of the fluorescent light fields of each region;
according to the calibration temperature of each region and the mean value of the ratio image of the fluorescence light field, using a formula
Calculating a relation coefficient of each region; the relation coefficient is used for representing the relation between the ratio of the fluorescent light field and the temperature value;
wherein, CiA relation coefficient, r, representing the ith areaiMean value of the fluorescence light field ratio image, t, representing the ith areaiDenotes the nominal temperature, I, of the I-th zone1And I2Respectively representing the energy of the laser with two wavelengths, delta E, emitted when the planar laser-induced fluorescence measuring device obtains the fluorescence light field ratio image12Representing the energy level difference of the two excitation lines, and k is a Boltzmann constant;
using a formula based on the relation coefficient of each of said regions
Calculating a temperature value corresponding to the ratio of the fluorescence light field of each region to obtain a two-dimensional temperature field of the combustion field;
wherein R isiRepresenting the ratio of the fluorescent light field of the i-th region, TiAnd representing the temperature value corresponding to the ratio of the fluorescence light field of the ith area.
3. The temperature measurement method based on the planar laser induced fluorescence measurement device according to claim 1 or 2, wherein the obtaining of the actual temperature corresponding to each calibration position in the combustion field specifically includes:
determining a corresponding position of each of the calibration positions in the combustion field;
acquiring the actual temperature of each corresponding position; the actual temperature is measured by a combustion field temperature measuring device; the combustion field temperature measuring device can measure and obtain the actual temperature of each corresponding position in the combustion field through position adjustment.
4. The utility model provides a temperature measurement system based on plane laser-induced fluorescence measuring device which characterized in that, temperature measurement system includes: the device comprises a plane laser induced fluorescence measuring device, a combustion field temperature measuring device and a temperature field acquiring device;
the plane laser induced fluorescence measuring device is used for measuring a fluorescence light field ratio image related to the combustion field and sending the fluorescence light field ratio image of the combustion field to a fluorescence light field ratio image acquisition unit of the temperature field acquisition device;
the temperature field acquisition device includes:
a fluorescent light field ratio image acquisition unit for acquiring a fluorescent light field ratio image with respect to the combustion field;
the calibration position selecting unit is used for dividing the fluorescence light field ratio image into a plurality of areas and selecting a plurality of calibration positions in each area;
the actual temperature acquisition unit is used for acquiring and acquiring the actual temperature corresponding to each calibration position in the combustion field;
the calibration temperature determining unit is used for determining the calibration temperature of each region according to the corresponding actual temperature of each calibration position in the combustion field;
the two-dimensional temperature field acquisition unit is used for respectively calculating temperature values corresponding to the ratio of the fluorescence light fields of the pixel points of each region by using the calibration temperature of each region to obtain a two-dimensional temperature field of the combustion field;
the combustion field temperature measuring device is used for measuring the actual temperature corresponding to each calibration position in the combustion field and sending the actual temperature corresponding to each calibration position in the combustion field to the actual temperature obtaining unit.
5. The temperature measurement system based on the plane laser induced fluorescence measurement device of claim 4, wherein the combustion field temperature measurement device comprises a thermocouple temperature measurement device and a lifting translation stage device;
the lifting translation table device is used for adjusting the position of the thermocouple temperature measuring device so as to measure the actual temperature of the combustion field corresponding to each calibration position;
the lifting translation stage device comprises: a lifting platform and a translation platform;
the fixed part of the translation table is fixed on the lifting table through a pressing plate, and the thermocouple temperature measuring device is arranged on the moving part of the translation table.
6. The temperature measurement system based on the plane laser induced fluorescence measurement device according to claim 5, wherein the thermocouple temperature measurement device comprises a thermocouple and a data thermometer;
the signal output end of the thermocouple is connected with the data thermometer, and the thermocouple is arranged on the moving part.
7. The temperature measurement system based on the plane laser induced fluorescence measurement device of claim 6, wherein the thermocouple temperature measurement device further comprises: the thermocouple fixing component comprises a thermocouple fixing component, a support rod and a fixing base;
the thermocouple is fixed at one end of the supporting rod through the thermocouple fixing part, the other end of the supporting rod is fixed on the fixed base, and the fixed base is arranged on the moving part.
8. The temperature measurement system based on the plane laser induced fluorescence measurement device as claimed in claim 5, wherein a standard ruler is vertically placed on one side of the lifting platform, two standard rulers are horizontally placed on two adjacent sides of the lifting platform, and the two standard rulers are perpendicular to each other.
9. A combustion field temperature measuring device, characterized in that: a thermocouple temperature measuring device and a lifting translation platform device;
the lifting translation table device is used for adjusting the thermocouple temperature measuring device to measure the actual temperature of the combustion field corresponding to each calibration position;
the lifting translation stage device comprises: a lifting platform and a translation platform;
the fixed part of the translation table is fixed on the lifting table through a pressing plate, and the thermocouple temperature measuring device is arranged on the moving part of the translation table.
10. A temperature field acquisition apparatus according to any one of claims 4 to 8.
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