CN111965153B - Measurement system for single-laser multi-scalar field information of combustion field - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N2021/6495—Miscellaneous methods
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Abstract
The invention discloses a measuring system of single-laser multi-scalar field information of a combustion field, which solves the defect that the existing method can only measure one scalar field and can not fully reveal combustion chemical process and temperature distribution, and provides a plane laser induced fluorescence and Rayleigh scattering imaging measuring system which can simultaneously measure a plurality of scalar field information only by one laser transmitting unit, wherein the laser transmitting unit transmits a laser beam containing quadruple-frequency laser and then reshapes the laser beam into a laser sheet by a laser sheet reshaping component; exciting fuel tracer molecules, OH and other free radicals and Rayleigh scattering of all molecules in a target area in a target flame by using a laser sheet; and a plurality of area array ICCD cameras are used for receiving the fuel tracer molecule images, the free radical images such as OH and the like and the Rayleigh scattering images, transmitting the images to an image processing unit, and obtaining the spatial distribution information of the free radicals such as fuel concentration, OH and the like and the temperature simultaneously after image processing.
Description
Technical Field
The invention relates to the field of energy power and optoelectronics, in particular to a measuring system for single-laser multi-scalar field information of a combustion field, and particularly relates to a measuring system for planar laser induced fluorescence imaging and Rayleigh scattering imaging, which only uses one laser to simultaneously measure various components and temperatures.
Background
With the increasing demands of society for combustion efficiency and pollutant emissions of combustion devices, including boilers, internal combustion engines, gas turbines, rocket engines, etc., research on fuel-oxidant mixing mechanisms, combustion flow and chemical coupling mechanisms, combustion chemistry and pollutant generation processes has become an important direction of energy power research. However, in the above-described research, it is necessary to simultaneously understand a plurality of scalar fields such as fuel distribution, OH distribution, and temperature distribution in the combustion process. However, the existing measuring system needs at least one laser for measuring one scalar field, and multiple sets of laser testing systems are needed to be overlapped for measuring multiple scalar fields, and multiple lasers are used at the same time, so that the measuring system is high in price, complex in operation and difficult to expand and upgrade.
Disclosure of Invention
Aiming at the defects that the number of scalar fields which can be measured when the existing laser test system is used for carrying out combustion fields is small, and a plurality of laser test systems are needed to be overlapped when the measurement of a plurality of scalar fields is carried out, so that the combustion chemical process and the temperature distribution of the combustion fields cannot be completely revealed, the operation is complex, the cost is high and the like.
The invention adopts the technical proposal for solving the technical problems that:
a measuring system for single laser multi-scalar field information of combustion field at least comprises a laser emitting unit, an interaction unit, a detection unit and an image processing unit, and is characterized in that,
the laser emission unit is used for emitting a laser beam with tunable fundamental frequency wavelength and at least comprising quadruple-frequency laser with wavelength near 266.2 nm;
the interaction unit at least comprises a laser sheet shaping component arranged on an outgoing light path of the laser emission unit and a target combustion field arranged at the downstream of the outgoing light path of the laser sheet shaping component, wherein the laser sheet shaping component is used for shaping an incident laser beam into a laser sheet, the laser sheet is projected to the target combustion field, at least the fuel tracer, OH free radicals and Rayleigh scattering of all molecules in flame of the target combustion field are excited, and fuel tracer fluorescence, OH free radical fluorescence and Rayleigh scattering light of all molecules are respectively generated;
the detection unit at least comprises a beam splitter and a plurality of area array ICCD cameras which are arranged around the target combustion field in a surrounding mode, the beam splitter is used for separating the Rayleigh scattering light from the fuel tracer fluorescence, and the plurality of area array ICCD cameras at least comprise a first area array ICCD camera, a second area array ICCD camera and a third area array ICCD camera which are used for recording the distribution of the fuel tracer fluorescence, OH free radical fluorescence and Rayleigh scattering light respectively;
the image processing unit is in communication connection with each area array ICCD camera, each area array ICCD camera respectively transmits the received fuel tracer molecule image, OH free radical image and Rayleigh scattering image to the image processing unit, and the image processing unit processes the image and simultaneously obtains the spatial distribution information of fuel concentration, OH free radical and temperature.
Preferably, the laser emitting unit is a Nd-YAG laser, and the laser emitting unit obtains the laser with the required wavelength by inserting an etalon into a resonant cavity of the Nd-YAG laser, or obtains the laser with the required wavelength by injecting wavelength-tunable seed light into a Nd-YAG crystal for amplification.
Preferably, the laser emitting units simultaneously output laser beams with fundamental frequencies around 1064nm, doubling wavelengths around 532nm, tripled wavelengths around 355nm, quadrupled wavelengths around 266nm on the same optical path.
Preferably, the single pulse energy output by the laser emission unit is 0.01-600mJ, the pulse width is 5-10ns, and the repetition frequency is 5-1e+6Hz.
Preferably, the repetition frequency of each area-array ICCD camera is 1-1e+6Hz.
Preferably, an optical filter is disposed in front of or behind the light incident lens of each of the area-array ICCD cameras, wherein a transmission wavelength range of the optical filter for capturing OH fluorescence is 309±20nm, a transmission wavelength range of the optical filter for capturing combustion tracer fluorescence is 360±40nm, and a transmission wavelength range of the optical filter for capturing rayleigh scattered light is 266±1nm.
Preferably, the interaction unit further includes a first incident beam splitter, the first incident beam splitter is disposed on an outgoing light path of the laser emission unit and located at an upstream of the laser sheet shaping component, the first incident beam splitter forms an included angle of 90 ° with an incident laser beam, and is used for performing beam sampling on a quadruple-frequency laser beam emitted by the laser emission unit, a first CMOS camera in communication connection with the image processing unit is disposed on a sampling light path of the first incident beam splitter, and the image processing unit processes sampling laser information collected by the first CMOS camera to obtain laser spot energy distribution.
Further, a natural density filter is arranged in front of or behind the light incidence lens of the CMOS camera.
Preferably, the system further comprises a signal control unit, wherein the laser emission unit, each of the area-array ICCD cameras and the CMOS cameras are all in communication connection with the signal control unit, and the signal control unit is used for synchronously controlling the laser emission unit, each of the area-array ICCD cameras and the CMOS cameras.
Preferably, the laser sheet shaping component comprises a plurality of cylindrical concave lenses, a plurality of spherical convex lenses and a plurality of cylindrical convex lenses, wherein the plurality of cylindrical concave lenses are used for widening light spots, the plurality of spherical convex lenses are used for shaping the widened light spots into parallel light spots, and the plurality of cylindrical convex lenses are used for adjusting the thickness of the laser sheet.
Preferably, the target combustion field is a combustion field formed by combusting fuel such as hydrogen, ammonia, methane, ethane, propane, ethanol, gasoline, kerosene, etc. by an optically transparent burner.
Preferably, the target combustion field is a combustion field formed by hydrocarbon fuel, the laser beam emitted by the laser emission unit further comprises a tripled laser with wavelength near 354.9nm, and the tripled laser is projected to the target combustion field after being shaped into a laser sheet by the laser sheet shaping component, and further excites CH free radicals and CH in the flame of the target combustion field 2 The plurality of plane ICCD cameras also comprise a fourth plane ICCD camera and a fifth plane ICCD camera which are in communication connection with the image processing unit, and the fourth plane ICCD camera and the fifth plane ICCD camera are used for respectively recording the CH free radical fluorescence and the CH free radical fluorescence 2 Distribution of O free radical fluorescence, the image processing unit performs fluorescence on CH free radicals, CH 2 After O free radical fluorescence image processing, CH free radical and CH are obtained simultaneously 2 Spatial distribution information of O radical concentration.
Further, the front or rear of the light incidence lens of the fourth and fifth plane-array ICCD cameras is provided with a light filter.
Further, the interaction unit further comprises a second incident beam splitter, the second incident beam splitter is arranged on an emergent light path of the laser emission unit and is located at the upstream of the laser sheet shaping component, the second incident beam splitter and an incident laser beam form an included angle of 90 degrees and are used for carrying out beam sampling on the triple-frequency laser emitted by the laser emission unit, a second CMOS camera which is in communication connection with the image processing unit is arranged on a sampling light path of the second incident beam splitter, and the image processing unit processes sampling laser information collected by the second CMOS camera to obtain laser spot energy distribution.
Further, the first to fifth plane-array ICCD cameras are at least two groups, and an included angle is formed between the plane-array ICCD cameras in each group so as to shoot at least two groups of image distribution, and the image processing unit uses a three-dimensional image reconstruction algorithm to reconstruct the multiple groups of distribution into a three-dimensional image.
Compared with the prior art, the combustion field single-laser multi-scalar field information measuring system has the beneficial effects that: (1) Only one laser with wavelength near 266.2nm is needed to resonantly excite the fuel tracer, OH free radical and Rayleigh scattering in the combustion field, two kinds of fluorescence with different laser wavelength and Rayleigh scattering light with the same incident laser wavelength can be generated and respectively imaged on three area array ICCD cameras, and then the spatial distribution information of three scalar fields is obtained simultaneously after the image processing unit performs image post-processing. The invention can obtain the most critical fuel distribution, OH distribution and temperature distribution information in the combustion process at the same time; (2) When further acquisition of spatial distribution information of other scalar fields in the combustion field is required, for example, when further acquisition of CH free radicals, CH in the combustion field is required 2 When the spatial distribution information of O free radical is displayed, the laser beam emitted by the laser emitting unit can be combined with the triple frequency laser with the wavelength near 354.9nm to excite CH free radical and CH in the combustion field 2 O free radical and generates CH free radical, CH 2 O free radical fluorescence is respectively utilized to carry out image acquisition by using an area array ICCD camera, and then an image processing unit is used for carrying out image post-processing to obtain CH free radicals and CH at the same time 2 Spatial distribution information of the O radical scalar field; (3) The measuring system of single-laser multi-scalar field information of the combustion field improves scalar field information measured at one time by the existing laser diagnosis technology, and provides powerful guarantee for research of combustion science, hydrodynamics, aerodynamics and combustion technology. The invention can be widely applied to fuel mixing in the combustion process, diagnosis of the combustion process and temperature distribution, and provides basic data for research of combustion science, hydrodynamics, aerodynamics and combustion technology.
Drawings
FIG. 1 is a schematic diagram of a combustion field single laser multiple scalar field information measurement system of the present invention.
In the figure, a laser emission unit 1, an incidence beam splitter 2, a natural density filter 3, a CMOS camera 4, a laser chip shaping part 5, a beam splitter 6, a Rayleigh scattering filter 7, a first ICCD camera 8, a fuel tracer fluorescence filter 9, a second ICCD 10, an OH free radical fluorescence filter 11, a third ICCD camera 12, an image processing unit 13, a signal control unit 14, and a target combustion field 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention become more apparent, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention. 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 following describes the structure and technical scheme of the present invention in detail with reference to the accompanying drawings, and an embodiment of the present invention is given.
As shown in FIG. 1, the combustion field single-laser multi-scalar field information measuring system at least comprises a laser emitting unit, an interaction unit, a detection unit and an image processing unit. Wherein, the laser emission unit 1 is used for emitting a laser beam with tunable fundamental frequency wavelength and at least comprising quadruple frequency laser with wavelength near 266.2 nm; the interaction unit at least comprises a laser sheet shaping component 5 arranged on the outgoing light path of the laser emission unit 1 and a target combustion field 15 arranged on the downstream of the outgoing light path of the laser sheet shaping component 5, wherein the laser sheet shaping component 5 is used for shaping an incident laser beam into a laser sheet, the laser sheet is projected to the target combustion field 15, at least the fuel tracer, OH free radicals and Rayleigh scattering of all molecules in the flame of the target combustion field 15 are excited, and fuel tracer fluorescence, OH free radical fluorescence and Rayleigh scattering light of all molecules are respectively generated; the detection unit at least comprises a beam splitter 6 and a plurality of area array ICCD cameras 8, 10 and 12 which are arranged around the target combustion field 15 in a surrounding manner, the beam splitter 6 is used for separating Rayleigh scattered light and fuel tracer fluorescence, and the plurality of area array ICCD cameras 8, 10 and 12 at least comprise a first area array ICCD camera 8, a second area array ICCD camera 10 and a third area array ICCD camera 12 which are used for respectively recording the distribution of the fuel tracer fluorescence, OH free radical fluorescence and Rayleigh scattered light; the image processing unit 13 is in communication connection with each of the area-array ICCD cameras 8, 10 and 12, and each of the area-array ICCD cameras 8, 10 and 12 respectively transmits the received fuel tracer molecule image, OH free radical image and Rayleigh scattering image to the image processing unit 13, and the image processing unit 13 processes the images and simultaneously obtains the spatial distribution information of the fuel concentration, OH free radical and temperature.
In the example of the present invention, the laser emitting unit 1 is preferably a Nd: YAG laser, and the laser emitting unit 1 obtains the laser light of the desired wavelength by inserting an etalon into the cavity of the Nd: YAG laser, or obtains the laser light of the desired wavelength by injecting a wavelength-tunable seed light into the Nd: YAG crystal for amplification. The laser emitting unit 1 preferably outputs laser beams having fundamental frequencies around 1064nm, doubling wavelengths around 532nm, tripled wavelengths around 355nm, quadrupled wavelengths around 266nm simultaneously on the same optical path. The laser emitting unit preferably outputs a single pulse energy of 0.01-600mJ, a pulse width of 5-10ns and a repetition frequency of 5-1e+6Hz.
In the example of the present invention, the repetition frequency of each area-array ICCD camera 8, 10, 12 is preferably 1-1e+6Hz. The front or rear of the light entrance lens of each area-array ICCD camera 8, 10, 12 is preferably provided with a filter, wherein the transmission wavelength range of the filter 11 for capturing OH fluorescence is 309±20nm, the transmission wavelength range of the filter 9 for capturing fuel tracer fluorescence is 360±40nm, and the transmission wavelength range of the filter 7 for capturing rayleigh scattered light is 266±1nm.
In the embodiment of the present invention, the interaction unit preferably further includes a first incident beam splitter 2, where the first incident beam splitter 2 is disposed on an outgoing light path of the laser emission unit 1 and is located upstream of the laser shaping component 5, the first incident beam splitter 2 forms an angle of 90 ° with an incident laser beam, so as to sample a quadruple-frequency laser beam emitted by the laser emission unit 1, and a first CMOS camera 4 in communication with the image processing unit 13 is disposed on a sampling light path of the first incident beam splitter 2, and the image processing unit 13 processes sampled laser information collected by the first CMOS camera 4 to obtain laser spot energy distribution. A natural density filter is provided in front of or behind the light entrance lens of the first CMOS camera 4.
The combustion field single-laser multi-scalar field information measuring system of the invention is also preferably provided with a signal control unit 14, wherein the laser emitting unit 1, each area-array ICCD camera 8, 10, 12 and the CMOS camera 4 are all in communication connection with the signal control unit 14, and the signal control unit 14 is used for synchronously controlling the laser emitting unit 1, each area-array ICCD camera 8, 10, 12 and the CMOS camera 4.
In the example of the present invention, the laser chip shaping unit 5 preferably includes a plurality of cylindrical concave lenses for expanding the light spots, a plurality of spherical convex lenses for shaping the expanded light spots into parallel light spots, and a plurality of cylindrical convex lenses for adjusting the thickness of the laser chip.
In the example of the present invention, the target combustion field 15 is preferably a combustion field formed by combusting a fuel such as hydrogen, ammonia, methane, ethane, propane, ethanol, gasoline, kerosene, etc., by an optically transparent burner.
In the example of the invention, the target combustion field 15 is preferably a combustion field formed by hydrocarbon fuel, the laser beam emitted by the laser emitting unit 1 further comprises a tripled frequency laser with the wavelength of about 354.9nm, and after being shaped into a laser sheet by the laser sheet shaping component 5 and projected to the target combustion field, the tripled frequency laser further excites CH free radicals and CH in the flame of the target combustion field 15 2 The O free radical, the multiple area-array ICCD cameras also comprise a fourth area-array ICCD camera and a fifth area-array ICCD camera which are in communication connection with the image processing unit, wherein the fourth area-array ICCD camera and the fifth area-array ICCD camera are used for respectively recording CH free radical fluorescence and CH free radical fluorescence 2 Distribution of O radical fluorescence, and the image processing unit 13 performs fluorescence on CH radical, CH 2 After O free radical fluorescence image processing, CH free radical and CH are obtained simultaneously 2 Spatial distribution information of O radical concentration.
The fourth and fifth plane ICCD cameras are respectively provided with optical filters in front of or behind the light incidence lenses. The interaction unit is also preferably provided with a second incident beam splitter, the second incident beam splitter is arranged on an emergent light path of the laser emission unit and is positioned at the upstream of the laser sheet shaping component, the second incident beam splitter forms an included angle of 90 degrees with an incident laser beam and is used for sampling the tripled laser emitted by the laser emission unit, a second CMOS camera which is in communication connection with the image processing unit is arranged on a sampling light path of the second incident beam splitter, and the image processing unit processes sampling laser information acquired by the second CMOS camera to obtain laser spot energy distribution.
In the embodiment of the present invention, the first to fifth plane-array ICCD cameras are preferably at least two groups, and an included angle is formed between the plane-array ICCD cameras in each group, so as to capture at least two groups of image distributions, and the image processing unit uses a three-dimensional image reconstruction algorithm to reconstruct the multiple groups of distributions into a three-dimensional image.
When the combustion field single-laser multi-scalar field information measuring system is used for measuring, different specific embodiments can be selected according to different measuring purposes.
The first embodiment is as follows:
the present embodiment will be described with reference to fig. 1, which includes the steps of:
an etalon is inserted into the laser emitting unit 1, preferably a Nd: YAG laser, so that the etalon can have a wavelength tuning function;
tuning the quadruple frequency wavelength of the laser emitting unit 1 to around 266.2 nm;
then, beam sampling is carried out through an incidence beam splitter 2, and the beam is sampled through a natural density filter 3 by a CMOS camera 4, so as to obtain laser spot energy distribution;
the rest of the vast majority of laser light is shaped into a laser sheet by a laser sheet shaping unit 5;
exciting fuel tracer, OH free radical and Rayleigh scattering in flame by using the shaped laser sheet, and separating the Rayleigh scattering from the fuel tracer fluorescence by using a beam splitter 6;
the Rayleigh scattering is filtered by using a Rayleigh scattering filter 7 and photographed by a first area array ICCD camera 8;
filtering the fuel tracer fluorescence using a fuel tracer fluorescence filter 9 and capturing with a second area-array ICCD camera 10;
the OH fluorescence is filtered using an OH filter 11 and photographed with a third area-array ICCD camera 12;
the laser emission unit 1, the sampling CMOS camera 4, and all of the area-array ICCD cameras 8, 10 and 12 are synchronized by the signal control unit 14;
the sampling CMOS camera 4 stores and post-processes the photographed results of the respective area-array ICCD cameras 8, 10, 12 by the image processing unit 13.
The OH filter transmission wavelength range in this embodiment is 309.+ -.20 nm, the fuel tracer filter transmission wavelength range is 360.+ -.40 nm, and the Rayleigh scattering filter transmission wavelength range is 266.+ -.1 nm.
The laser chip shaping unit 5 in the present embodiment includes a plurality of cylindrical concave lenses for widening the light spot; the spherical convex lenses are used for shaping the widened light spots into parallel light spots and the cylindrical convex lenses and are used for adjusting the thickness of the laser sheet.
The target combustion field 15 in the present embodiment is a flame formed by combusting a fuel such as hydrogen, ammonia, methane, ethane, propane, ethanol, gasoline, or kerosene with a burner.
The second embodiment is as follows: the difference between the present embodiment and the specific embodiment is that the single pulse energy output by the laser emitting unit 1 in the first step is 0.01-600mJ, the pulse width is 5-10ns, and the repetition frequency is 1-1e+6hz. Other compositions and connection modes are the same as in the first embodiment.
And a third specific embodiment: the present embodiment is different from the first embodiment in that the laser emitting unit 1 described in the first step uses a method of amplifying a Nd: YAG crystal injected with a wavelength-tunable seed light to obtain a laser with a desired wavelength, and other compositions and connection modes are the same as those of the first embodiment.
The specific embodiment IV is as follows: the difference between this embodiment and the embodiment is that the sampling CMOS camera 4 described in the first step, the area-array ICCD cameras 8, 10, 12, the repetition frequency is 1-1+e6hz, and other components and connection modes are the same as those of the first embodiment.
Fifth embodiment: the present embodiment is different from the above-described specific embodiment in that the present embodiment simultaneously obtains fuel, OH, CH of a target area designated by flame, as described with reference to fig. 1 2 Two-dimensional spatial distribution information of O and temperature; the target used was a hydrocarbon fuel flame.
Step one: the laser emission unit 1 can simultaneously output laser with the frequency multiplication wavelength of 354.9nm nearby on the same optical path; on the basis of the embodiment, the laser near 354.9nm is used for exciting CH free radical and CH 2 O free radicals;
step two: an additional 355+/-1 nm optical filter and a sampling CMOS camera are added to shoot 354.9nm laser spot energy distribution;
step three: adding an additional CH optical filter and an area array ICCD camera, and shooting CH free radical two-dimensional distribution;
step four: adding additional CH 2 O-filter and area-array ICCD camera shooting CH 2 Two-dimensional distribution of O free radicals; other compositions and connection modes are the same as those of the above-described embodiments.
Specific embodiment six: the present embodiment is different from the embodiment in that the laser emitting unit 1 described in the first step can output 1 to 4 wavelengths of the laser light of the vicinity of the fundamental frequency 1064nm, the vicinity of the frequency doubling wavelength 532nm, the vicinity of the frequency tripled 355nm, and the vicinity of 266nm on the same optical path at the same time, and other compositions and connection modes are the same as those of the first embodiment.
Seventh embodiment: the present embodiment is different from the above-described specific embodiment in that the present embodiment simultaneously obtains fuel, OH, CH of a target area designated by flame, as described with reference to fig. 1 2 Three-dimensional space distribution information of O and temperature; the target used was a hydrocarbon fuel flame.
Step one: the laser emission unit 1 can simultaneously output laser with the frequency multiplication wavelength of 354.9nm nearby on the same optical path; on the basis of the embodiment, the laser near 354.9nm is used for exciting CH free radical and CH 2 O free radicals;
step two: an additional 355+/-1 nm optical filter and a sampling CMOS (complementary metal oxide semiconductor) are added to shoot 354.9nm laser spot energy distribution;
step three: the laser sheet shaping part 5 becomes a laser beam shaping system to change the laser beam outputted from the laser emitting unit 1 into a laser beam having a larger spot radius.
Step four: adding one or more groups of additional Rayleigh scattering filters and an area array ICCD camera with optical filters, wherein each group of area array ICCD camera with optical filters forms a certain included angle, and shooting more than 2 groups of Rayleigh scattering distribution;
step five: adding one or more groups of additional fuel tracer filter and area array ICCD cameras with filters, wherein each group of the area array ICCD cameras with the filters form a determined included angle, and shooting more than 2 groups of fuel tracer fluorescence distribution;
step six: adding one or more groups of additional OH optical filters and an area array ICCD camera with optical filters, wherein each group of the area array ICCD cameras with the optical filters form a certain included angle, and shooting more than 2 groups of OH fluorescence distribution;
step seven: adding more than two groups of additional CH optical filters and an area array ICCD camera with optical filters, wherein each group of the area array ICCD cameras with the optical filters form a certain included angle, and shooting more than 2 groups of CH fluorescence distribution;
step eight: adding one or more additional sets of CH 2 O-filter and area-array ICCD camera with filter composed of area-array ICCD cameras, each group CH 2 The area array ICCD camera with the O-band optical filter forms a definite included angle and shoots more than 2 groups of CH 2 O fluorescence distribution;
step nine: and reconstructing the multiple groups of distributions into a three-dimensional image by using a three-dimensional image reconstruction algorithm.
The laser beam shaping means 5 in this embodiment includes a spherical concave lens for expanding the light spot and a spherical convex lens for parallelizing the expanded light spot.
The weight frequency of the laser emission unit in the embodiment is 1-1e+6Hz, and the weight frequency of the ICCD is 1-1e+6Hz; other compositions and connection modes are the same as those of the above-described embodiments.
The present invention is not limited to the above embodiments, and the object of the invention can be achieved by one or a combination of several embodiments.
The object of the present invention is fully effectively achieved by the above-described embodiments. Those skilled in the art will appreciate that the present invention includes, but is not limited to, those illustrated in the drawings and described in the foregoing detailed description. While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
Claims (5)
1. A measuring system for single laser multi-scalar field information of combustion field at least comprises a laser emitting unit, an interaction unit, a detection unit and an image processing unit, and is characterized in that,
the laser emission unit is a YAG laser, the YAG laser obtains laser with required wavelength by inserting an etalon in a resonant cavity of the YAG laser or obtains laser with required wavelength by injecting wavelength-adjustable seed light into a YAG crystal for amplifying, and the laser emission unit outputs laser beams with fundamental frequency near 1064nm, frequency doubling wavelength near 532nm, frequency tripleing wavelength near 355nm and frequency quadrupling wavelength near 266nm on the same optical path simultaneously;
the interaction unit at least comprises a laser sheet shaping component arranged on the outgoing light path of the laser emission unit and a target combustion field arranged at the downstream of the outgoing light path of the laser sheet shaping component, wherein the target combustion field is a combustion field formed by hydrocarbon fuel, the laser sheet shaping component is used for shaping an incident laser beam into a laser sheet, the laser sheet is projected to the target combustion field, and the laser sheet excites a fuel tracer, OH free radicals and Rayleigh scattering of all molecules in the flame of the target combustion field through four-time frequency laser with the wavelength near 266nm and respectively generates fuel tracer fluorescence and OH free radical fluorescence, rayleigh scattered light of all molecules, exciting CH free radicals and CH in the flame of the target combustion field by a frequency tripled laser with a wavelength near 355nm 2 O free radicals and generate CH free radical fluorescence, CH respectively 2 O free radical fluorescence;
the detection unit at least comprises a beam splitter and a plurality of area array ICCD cameras which are arranged around the target combustion field in a surrounding way, the beam splitter is used for separating the Rayleigh scattering light from the fuel tracer fluorescence, the plurality of area array ICCD cameras comprise a first area array ICCD camera, a second area array ICCD camera, a third area array ICCD camera, a fourth area array ICCD camera and a fifth area array ICCD camera, and the detection unit is used for respectively recording the fuel tracer fluorescence, OH free radical fluorescence, rayleigh scattering light, CH free radical fluorescence and CH free radical fluorescence 2 The distribution of O free radical fluorescence, the first to fifth plane-array ICCD cameras are at least two groups, included angles are formed between the plane-array ICCD cameras in each group so as to shoot at least two groups of image distribution, and the image processing unit uses a three-dimensional image reconstruction algorithm to reconstruct a plurality of groups of image distribution into a three-dimensional image;
the image processing unit is in communication connection with each of the area-array ICCD cameras, and each of the area-array ICCD cameras respectively receives the molecular image of the fuel tracer, the OH free radical image, the CH free radical fluorescent image and the CH free radical fluorescent image 2 The O free radical image and the Rayleigh scattering image are transmitted to the image processing unit, and the image processing unit obtains the fuel concentration, the OH free radical, the CH free radical and the CH at the same time after processing the image 2 Spatial distribution information of O free radicals and temperature;
the interaction unit further comprises a first incident beam splitter and a second incident beam splitter, the first incident beam splitter and the second incident beam splitter are both arranged on an emergent light path of the laser emission unit and are located at the upstream of the laser sheet shaping component, the first incident beam splitter and the second incident beam splitter are both in an included angle of 90 degrees with an incident laser beam, the first incident beam splitter is used for carrying out beam sampling on the quadruple-frequency laser beam emitted by the laser emission unit, a first CMOS camera in communication connection with the image processing unit is arranged on a sampling light path of the first incident beam splitter, the image processing unit obtains laser spot energy distribution after processing the sampling laser information collected by the first CMOS camera, the second incident beam splitter is used for carrying out beam sampling on the triplee-frequency laser emitted by the laser emission unit, a second CMOS camera in communication connection with the image processing unit is arranged on a sampling light path of the second incident beam splitter, and the image processing unit obtains laser spot energy distribution after processing the sampling laser information collected by the second CMOS camera.
2. The system of claim 1, wherein each of the area-array ICCD cameras is provided with a filter in front of or behind a light-incident lens, wherein a filter transmission wavelength range for capturing OH fluorescence is 309±20nm, a filter transmission wavelength range for capturing combustion tracer fluorescence is 360±40nm, and a filter transmission wavelength range for capturing rayleigh scattered light is 266±1nm.
3. The system of claim 1, wherein a natural density filter is provided in front of or behind the light entrance lens of each CMOS camera.
4. The system of claim 1, further comprising a signal control unit, wherein the laser emission unit, each area-array ICCD camera, and the CMOS camera are communicatively coupled to the signal control unit, and wherein the signal control unit is configured to synchronously control the laser emission unit, each area-array ICCD camera, and the CMOS camera.
5. The system of claim 1, wherein the laser chip shaping means comprises a plurality of cylindrical concave lenses for unidirectionally expanding the light spot, a plurality of spherical convex lenses for shaping the expanded light spot into parallel light spots, and a plurality of cylindrical convex lenses for adjusting the thickness of the laser chip in the measurement area.
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| CN116087163B (en) * | 2022-12-07 | 2023-12-26 | 西安交通大学 | Synchronous measurement system and method for NH3-PFLIF and NH-LIF of ammonia reaction flow |
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