CN114112099B - 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 measuring method and a temperature measuring system based on a plane laser-induced fluorescence measuring device, wherein the temperature measuring method comprises the following steps: acquiring a fluorescence light field ratio image about a combustion field based on a planar laser induced fluorescence measurement device; dividing the fluorescence light field ratio image into a plurality of areas, and selecting a plurality of calibration positions in each area; acquiring the corresponding actual temperature of each calibration position in a combustion field; determining the calibration temperature of each area according to the corresponding actual temperature of each calibration position in the combustion field; and calculating a temperature value corresponding to the fluorescence light field ratio of each pixel point in each region by using the calibration temperature of each region. According to the invention, the fluorescent light field ratio image is divided into a plurality of areas, the calibration temperature of each area is determined by adopting a multi-point measurement mode in the plurality of areas, and the temperature value corresponding to the fluorescent light field ratio of the pixel point is determined based on the calibration temperature, so that the comprehensive and accurate measurement of the temperature of each position of the combustion field is realized.
Description
Technical Field
The invention relates to the technical field of combustion field monitoring, in particular to a temperature measuring method and system based on a planar laser-induced fluorescence measuring device.
Background
In the aerospace field, gunpowder is used as an important component in the aerospace field, and the parameters such as temperature, combustion conditions and the like in the combustion process of the gunpowder have important significance. However, in the gunpowder combustion process, the temperature of different flame positions is different, and the existing temperature measuring device can only measure a certain position and cannot comprehensively measure the whole combustion field of the gunpowder combustion.
Disclosure of Invention
The invention aims to provide a temperature measuring method and a temperature measuring system based on a planar laser-induced fluorescence measuring device, so as to realize comprehensive measurement of the whole combustion field of gunpowder combustion.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a temperature measuring method based on a planar laser-induced fluorescence measuring device, which comprises the following steps:
acquiring a fluorescence light field ratio image about a combustion field based on a planar laser induced fluorescence measurement device;
dividing the fluorescence light field ratio image into a plurality of areas, and selecting a plurality of calibration positions in each area;
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 calculating a temperature value corresponding to the fluorescence light field ratio of each pixel point in each region by using the calibration temperature of each region to obtain a two-dimensional temperature field of the combustion field.
Optionally, calculating a temperature value corresponding to a fluorescence light field ratio of each pixel point in each region by using the calibration temperature of each region, to obtain a two-dimensional temperature field of the combustion field, which specifically includes:
calculating the average value of the fluorescence light field ratio of each pixel point of each region to obtain the average value of the fluorescence light field ratio image of each region;
according to the calibration temperature of each region and the average value of the fluorescence light field ratio image, using a formulaCalculating a relationship coefficient of each region; the relation coefficient is used for representing the relation between the fluorescence light field ratio and the temperature value;
wherein C is i A relation coefficient representing the i-th region, r i Mean value of fluorescence light field ratio image representing ith area, t i Indicating the nominal temperature of the I-th zone, I 1 And I 2 Respectively represents the energy of the laser of two wavelengths, delta E, emitted when the planar laser-induced fluorescence measuring device acquires the fluorescence light field ratio image 12 The energy level difference between the two excitation lines is represented, and k is a boltzmann constant.
Based on the relation coefficient of each region, using formulaCalculating a temperature value corresponding to the fluorescence light field ratio of each pixel point of each region to obtain a two-dimensional temperature field of the combustion field;
wherein R is i Representing the fluorescence light field ratio, T, of the ith region i And the temperature value corresponding to the fluorescence light field ratio of the ith area is represented.
Optionally, the acquiring 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.
A temperature measurement system based on a planar laser-induced fluorescence measurement device, the temperature measurement system comprising: a plane laser induced fluorescence measuring device, a combustion field temperature measuring device and a temperature field acquisition device;
the plane laser induced fluorescence measuring device is used for measuring a fluorescence light field ratio image related to the combustion field and transmitting 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 fluorescence light field ratio image acquisition unit for acquiring a fluorescence light field ratio image concerning the combustion field;
the calibration position selection 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 area 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 a temperature value corresponding to the fluorescence light field ratio of each pixel point 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 corresponding actual temperature of each calibration position in the combustion field and sending the corresponding actual temperature of each calibration position in the combustion field to the actual temperature acquisition unit.
Optionally, the combustion field temperature measuring device comprises a thermocouple temperature measuring device and a lifting translation table 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: lifting and translating;
the fixed part of the translation table is fixed on the lifting table through the pressing plate, and the thermocouple temperature measuring device is arranged on the moving part of the translation table.
Optionally, the thermocouple temperature measuring device comprises a thermocouple and a data thermometer;
and 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: thermocouple fixing part, support rod and fixing base;
the thermocouple is fixed at one end of the supporting rod through the thermocouple fixing component, the other end of the supporting rod is fixed on the fixing base, and the fixing base is arranged on the moving part.
Optionally, one side of elevating platform is provided with the standard ruler of vertical placement, two adjacent sides of elevating platform are provided with two standard rulers of horizontal placement, and two standard rulers of horizontal placement mutually perpendicular.
A combustion field temperature measurement device, the combustion field temperature measurement device: a thermocouple temperature measuring device and a lifting translation table 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: lifting and translating;
the fixed part of the translation table is fixed on the lifting table through the 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 measuring method and a temperature measuring system based on a plane laser-induced fluorescence measuring device, wherein the temperature measuring method comprises the following steps: acquiring a fluorescence light field ratio image about a combustion field based on a planar laser induced fluorescence measurement device; dividing the fluorescence light field ratio image into a plurality of areas, and selecting a plurality of calibration positions in each area; 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 calculating a temperature value corresponding to the fluorescence light field ratio of each pixel point in each region by using the calibration temperature of each region to obtain a two-dimensional temperature field of the combustion field. According to the invention, the fluorescent light field ratio image is divided into a plurality of areas, the calibration temperature of each area is determined by adopting a multi-point measurement mode in the plurality of areas, and the temperature value corresponding to the fluorescent light field ratio of the pixel point is determined based on the calibration temperature, so that the comprehensive and accurate measurement of the temperature of each position of the combustion field is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a temperature measurement method based on a planar laser-induced fluorescence measurement device according to embodiment 1 of the present invention;
FIG. 2 is a block diagram of a combustion field temperature measuring device according to embodiment 2 of the present invention;
fig. 3 is a structural diagram of a planar laser-induced fluorescence measurement device according to embodiment 2 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a temperature measuring method and a temperature measuring system based on a planar laser-induced fluorescence measuring device, so as to realize comprehensive measurement of the whole combustion field of gunpowder combustion.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The planar laser induced fluorescence technology adopts pulse laser with specific wavelength to excite a rotating energy level transition line of a certain combustion field on the same vibration level, two sets of fluorescence signals are obtained by repeating the operation twice, the intensity ratio of the fluorescence signals corresponding to the two wavelengths is calculated, and then the two-dimensional flame temperature is deduced according to the intensity ratio of the fluorescence signals and the Boltzmann distribution of the particle numbers of different rotating energy levels. The fluorescence light field image of the combustion field can be obtained based on the plane laser induced fluorescence technology, so that the comprehensive temperature measurement of the combustion field can be realized based on the plane laser induced fluorescence measurement device.
Example 1
As shown in fig. 1, the invention further provides a temperature measurement method based on the planar laser-induced fluorescence measurement device, which comprises the following steps:
step 101, acquiring a fluorescence light field ratio image about a combustion field based on a planar laser induced fluorescence measurement device.
Fluorescent light field image F obtained by exciting same combustion field with different wavelengths through image acquisition system 1 、F 2 And obtaining a fluorescence light field ratio image by using the formula (1).
Wherein R is a fluorescence light field ratio image, F 1 、F 2 Is a fluorescent light field image.
Step 102, dividing the fluorescence light field ratio image into a plurality of areas, and selecting a plurality of calibration positions in each area.
And step 103, acquiring the actual temperature corresponding to each calibration position in the combustion field.
And 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 knob on the lifting platform device and the knob on the platform device are rotated by taking the standard ruler as a reference, so that the temperature values of a plurality of calibration positions are sequentially obtained.
The obtaining the actual temperature corresponding to each calibration position in the combustion field specifically comprises the following steps:
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 measurement device as a coordinate origin, taking a lifting direction of a lifting table of the combustion field temperature measurement device as a y-axis and taking a horizontal direction of a translation table as an x-axis; the measurement origin is the initial position of the lifting and translation. And taking the corresponding position of the measurement origin in the fluorescence light field ratio image as a coordinate origin, and establishing a plane coordinate system of the fluorescence light field ratio image. 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 and the translation of the combustion field temperature measuring device are adjusted, and the temperature measuring points of the thermocouple temperature measuring device of the combustion field temperature measuring device are respectively moved to the corresponding positions, and the actual temperature corresponding to each calibration position in the combustion field.
And 104, determining the calibration temperature of each area according to the corresponding actual temperature of each calibration position in the combustion field.
The method comprises the step of determining the calibration temperature of each area by calculating the average value of the corresponding actual temperatures of all calibration positions in each area in the combustion field.
And 105, calculating a temperature value corresponding to the fluorescence light field ratio of each pixel point in each region by using the calibrated temperature of each region, and obtaining a two-dimensional temperature field of the combustion field.
Step 105, calculating a temperature value corresponding to a fluorescence light field ratio of each pixel point in each region by using the calibration temperature of each region, to obtain a two-dimensional temperature field of the combustion field, which specifically includes:
and calculating the average value of the fluorescence light field ratio of each pixel point of each region to obtain the average value of the fluorescence light field ratio image 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 average value of the fluorescence light field ratio image. The relationship coefficient is used for representing the relationship between the fluorescence light field ratio and the temperature value.
Wherein C is i A relation coefficient representing the i-th region, r i Mean value of fluorescence light field ratio image representing ith area, t i Indicating the nominal temperature of the I-th zone, I 1 And I 2 Respectively represent the energy delta E of the laser with two wavelengths emitted in the temperature measuring process of the plane laser induced fluorescence measuring device 12 The energy level difference between the two excitation lines is represented, and k is a boltzmann constant.
According to the relation coefficient of each area, calculating a temperature value corresponding to the fluorescence light field ratio of each area by using a formula (3) to obtain a two-dimensional temperature field of the combustion field;
wherein R is i Representing the fluorescence light field ratio, T, of the ith region i Indicating the temperature of the i-th zone.
Example 2
The invention also provides a temperature measurement system based on the planar laser-induced fluorescence measurement device, which comprises: a plane laser induced fluorescence measuring device, a combustion field temperature measuring device and a temperature field acquisition device; the plane laser induced fluorescence measuring device is used for measuring a fluorescence light field ratio image related to the combustion field and transmitting 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 fluorescence light field ratio image acquisition unit for acquiring a fluorescence light field ratio image concerning the combustion field; the calibration position selection 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 area 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 a temperature value corresponding to the fluorescence light field ratio of each pixel point 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 corresponding actual temperature of each calibration position in the combustion field and sending the corresponding actual temperature of each calibration position in the combustion field to the actual temperature acquisition unit.
As shown in fig. 2, the combustion field temperature measuring device of the present invention comprises 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 supporting 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 fixed base 4, and the tail end of the thermocouple 1 is connected with the data thermometer 5.
The lifting translation table device comprises a lifting table 6, a standard ruler 7, a translation table 8 and a pressing plate 9; the standard ruler 7 is vertically put to elevating platform 6 one side, and translation platform 8 is fixed on elevating platform 6, is fixed by clamp plate 9, and two-dimensional temperature field calibration device is fixed on translation platform 8, and two standard ruler 7 are put to two adjacent sides of translation platform 8 level respectively, and two standard ruler 7 mutually perpendicular that the level was put, the four directions of clamp plate 9 fixed two-dimensional temperature field calibration device.
Wherein, the thermocouple 1 adopts a B-type platinum rhodium thermocouple.
The thermocouple fixing component 2 is cylindrical, the radius of the bottom is 2.5cm, the height is 1.5cm, the axial direction of the cylinder is through hole threads, the thread model is NPT 3/8, one side of the rotating surface of the cylinder is a plane, the plane size is 1.5cm multiplied by 1.5cm, the center of the plane is blind hole threads, and the thread model is M6.
The supporting rod 3 adopts a supporting rod with external threads of M6. The fixed base 4 adopts an integral English system rod frame base. The data thermometer 5 is a bluetooth data thermometer. The lifting table 6 adopts a scissor type lifting table. The translation stage 8 adopts a biaxial linear displacement stage.
As shown in fig. 3, the plane laser induced fluorescence measurement device is configured to emit two lasers with different wavelengths to a combustion field twice, obtain fluorescence light field images of the combustion field under the excitation of the two lasers with different wavelengths, and calculate a ratio of the fluorescence light field images under the excitation of the two lasers to obtain a fluorescence light field ratio image about the combustion field, where the plane laser induced fluorescence measurement device 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 plane furnace (combustion field to be measured) G, and an image acquisition system H;
the image acquisition system H acquires fluorescent images of a plane furnace (combustion field to be detected) G to obtain two fluorescent light field images with different wavelengths. And performing ratio calculation on the two fluorescent images with different wavelengths to obtain a fluorescent light field ratio image.
The temperature field acquisition device can be realized on the basis of software, hardware and software.
Example 3
As shown in fig. 2, the combustion field temperature measuring device of the present invention comprises 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 supporting 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 fixed base 4, and the tail end of the thermocouple 1 is connected with the data thermometer 5.
The lifting translation table device comprises a lifting table 6, a standard ruler 7, a translation table 8 and a pressing plate 9; the standard ruler 7 is vertically put to elevating platform 6 one side, and translation platform 8 is fixed on elevating platform 6, is fixed by clamp plate 9, and two-dimensional temperature field calibration device is fixed on translation platform 8, and two standard ruler 7 are put to two adjacent sides of translation platform 8 level respectively, and two standard ruler 7 mutually perpendicular that the level was put, the four directions of clamp plate 9 fixed two-dimensional temperature field calibration device.
Example 4
A storage medium having stored thereon executable instructions which, when executed by a processor, implement the steps of the thermometry method of embodiment 1.
Example 5
For the purpose of illustrating the practice of the invention, the invention provides the following specific embodiments.
Firstly, 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;
step two, setting the length of the fluorescence light field ratio image as X, and equally dividing the length of the fluorescence light field ratio image into m parts, wherein the length of each part of fluorescence image is X;
step three, 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, and equally dividing the width of the fluorescence light field ratio image into n parts, wherein the width of each part of fluorescence image is Y;
step five, enabling the ordinate on the ordinate axis to be 0, y,2y, … and ny in sequence;
step six, sequentially connecting [ (m-1) x, ny ], (mx, ny), [ mx, (n-1) y ], [ (m-1) x, (n-1) y ] on the coordinate axis to form a rectangular area, wherein the rectangular area is { m, n };
step seven, setting five points [ (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 of rectangular areas { m, n };
measuring temperature values of 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 ] by using a combustion field temperature calibration device based on planar laser-induced fluorescence measurement;
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 }.
Wherein t is {m,n} The temperature value t is the calibrated temperature value of a rectangular region { m, n }, t (mx,ny) The measured temperature value is the temperature value of the temperature point.
All pixel points in the rectangular region { m, n } are averaged to be used as the average value of the fluorescent light field ratio image in the rectangular region { m, n }, and the average value is named as r {m，n} 。
Step ten, utilizing the formula
The relation coefficient of the rectangular area { m, n } is obtained.
Wherein C is {m,n} Is the relation coefficient of rectangular area { m, n }, r {m,n} Is the average value of the rectangular { m, n } fluorescence light field ratio image, I 1 And I 2 Is the energy of laser with two wavelengths, delta E 12 Is the energy level difference of two excitation lines, k is Boltzmann constant, t {m,n} The nominal temperature value for the rectangular region { m, n }.
Step eleven, utilize the formula
A temperature field of rectangular area m, n is obtained.
Wherein T is {m,n} A temperature field of rectangular area { m, n }, C {m,n} Is the relation coefficient of rectangular area { m, n }, r {m,n} Is a rectangular area { m, n } fluorescence light field ratio image, I 1 And I 2 Is the energy of laser with two wavelengths, delta E 12 K is the Boltzmann constant, which is the energy level difference between the two excitation lines.
Twelve steps, using the formula
A two-dimensional temperature field of the combustion field is obtained.
Wherein T is a two-dimensional temperature field of a combustion field, T {m,n} A temperature field of rectangular area { m, n }.
The method comprises the steps of obtaining a fluorescent light field image by using a Planar Laser Induced Fluorescence (PLIF) technology under different wavelengths, carrying out regional treatment, carrying out temperature measurement on selected points in each region, taking a temperature average value as a calibration temperature value in the region, inverting by using a fluorescent light field ratio image and the calibration temperature value of each region to obtain a temperature field image of the region, and synthesizing all the temperature field images of the region into a complete temperature field image. This results in a reduced error in the process of obtaining the temperature field and an improved accuracy compared to existing methods.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The temperature measurement method based on the planar laser-induced fluorescence measurement device is characterized by comprising the following steps of:
acquiring a fluorescence light field ratio image about a combustion field based on a planar laser induced fluorescence measurement device;
dividing the fluorescence light field ratio image into a plurality of areas, and selecting a plurality of calibration positions in each area;
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;
calculating a temperature value corresponding to the fluorescence light field ratio of each pixel point in each region by using the calibration temperature of each region to obtain a two-dimensional temperature field of the combustion field;
calculating a temperature value corresponding to a fluorescence light field ratio of each pixel point in each region by using the calibration temperature of each region to obtain a two-dimensional temperature field of the combustion field, wherein the method specifically comprises the following steps:
calculating the average value of the fluorescence light field ratio of each pixel point of each region to obtain the average value of the fluorescence light field ratio image of each region;
according to the calibration temperature of each region and the average value of the fluorescence light field ratio image, using a formulaCalculating a relationship coefficient of each region; the relation coefficient is used for representing the relation between the fluorescence light field ratio and the temperature value;
wherein C is i A relation coefficient representing the i-th region, r i Mean value of fluorescence light field ratio image representing ith area, t i Representation ofThe calibration temperature of the ith zone, I 1 And I 2 Respectively represents the energy of the laser of two wavelengths, delta E, emitted when the planar laser-induced fluorescence measuring device acquires the fluorescence light field ratio image 12 The energy level difference of the two excitation lines is represented, and k is a Boltzmann constant;
based on the relation coefficient of each region, using formulaCalculating a temperature value corresponding to the fluorescence light field ratio of each area to obtain a two-dimensional temperature field of the combustion field;
wherein R is i Representing the fluorescence light field ratio, T, of the ith region i Representing a temperature value corresponding to the fluorescence light field ratio of the ith area;
the obtaining the corresponding actual temperature of each calibration position in the combustion field specifically comprises the following steps:
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.
2. A temperature measurement system based on a planar laser induced fluorescence measurement device, wherein the temperature measurement system is applied to the temperature measurement method of claim 1, the temperature measurement system comprising: a plane laser induced fluorescence measuring device, a combustion field temperature measuring device and a temperature field acquisition device;
the plane laser induced fluorescence measuring device is used for measuring a fluorescence light field ratio image related to the combustion field and transmitting 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 fluorescence light field ratio image acquisition unit for acquiring a fluorescence light field ratio image concerning the combustion field;
the calibration position selection 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 area 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 a temperature value corresponding to the fluorescence light field ratio of each pixel point 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 corresponding actual temperature of each calibration position in the combustion field and sending the corresponding actual temperature of each calibration position in the combustion field to the actual temperature acquisition unit.
3. The temperature measurement system based on a planar laser induced fluorescence measurement device according to claim 2, 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: lifting and translating;
the fixed part of the translation table is fixed on the lifting table through the pressing plate, and the thermocouple temperature measuring device is arranged on the moving part of the translation table.
4. A temperature measurement system based on a planar laser induced fluorescence measurement device according to claim 3, wherein the thermocouple temperature measurement device comprises a thermocouple and a data thermometer;
and the signal output end of the thermocouple is connected with the data thermometer, and the thermocouple is arranged on the moving part.
5. The planar laser induced fluorescence measurement device based thermometry system of claim 4, wherein the thermocouple thermometry device further comprises: thermocouple fixing part, support rod and fixing base;
the thermocouple is fixed at one end of the supporting rod through the thermocouple fixing component, the other end of the supporting rod is fixed on the fixing base, and the fixing base is arranged on the moving part.
6. The temperature measurement system based on the planar laser-induced fluorescence measurement device according to claim 3, wherein one side of the lifting table is provided with a standard ruler which is vertically placed, two adjacent side surfaces of the lifting table are provided with two standard rulers which are horizontally placed, and the two standard rulers which are horizontally placed are mutually perpendicular.
7. A combustion field temperature measuring device, characterized in that the combustion field temperature measuring device is applied to the temperature measuring method of claim 1, the combustion field temperature measuring device: a thermocouple temperature measuring device and a lifting translation table 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: lifting and translating;
the fixed part of the translation table is fixed on the lifting table through the pressing plate, and the thermocouple temperature measuring device is arranged on the moving part of the translation table.
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| RU2758869C1 (en) * | 2020-09-30 | 2021-11-02 | Федеральное государственное бюджетное учреждение науки Институт теплофизики им. С.С. Кутателадзе Сибирского отделения Российской академии наук | Method for measuring the temperature field in reacting gas flows based on planar laser-induced fluorescence of a hydroxyl radical |
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| CN103063640A (en) * | 2012-12-28 | 2013-04-24 | 西北核技术研究所 | Laser-induced fluorescence combustion field parameter measuring device |
| JP2019002698A (en) * | 2017-06-12 | 2019-01-10 | 株式会社ジェイテクト | Temperature measurement device and temperature measurement method |
| CN110823849A (en) * | 2019-09-25 | 2020-02-21 | 北京航空航天大学 | Quantitative measurement method and device for transient combustion field |
| CN111257497A (en) * | 2020-02-17 | 2020-06-09 | 上海交通大学 | Flame temperature field measuring device and method |
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