CN111402319B - Atomized particle size measuring method and system - Google Patents
Atomized particle size measuring method and system Download PDFInfo
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- CN111402319B CN111402319B CN202010108190.4A CN202010108190A CN111402319B CN 111402319 B CN111402319 B CN 111402319B CN 202010108190 A CN202010108190 A CN 202010108190A CN 111402319 B CN111402319 B CN 111402319B
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- 238000000889 atomisation Methods 0.000 claims abstract description 40
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- 150000002367 halogens Chemical class 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 5
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/12—Edge-based segmentation
Abstract
The invention provides an atomized particle size measuring method and system, wherein the method comprises the following steps: establishing a database, and storing an experimental image and a background image; deleting an original background in the experimental image to obtain a liquid drop atomization image; carrying out gray processing on the liquid drop atomization image; median filtering and image binarization; filling is carried out, a figure filling closed image is obtained, and figure calibration is carried out; screening the calibrated graph to obtain an ideal liquid drop model; and calculating the diameter of the ideal liquid drop model to obtain the diameter of the liquid drop. The system comprises terminal equipment, a atomization device, a high-speed camera and a halogen lamp. The method and the system for measuring the atomized particle size also have the advantages of reasonable steps and improvement on the accuracy of the calculated diameter of the liquid drop.
Description
Technical Field
The invention relates to the aspect of atomization particle size measurement experiments, in particular to an atomization particle size measurement method and system.
Background
The diameter of the atomized liquid drop is the most direct index for evaluating the performance of the rotary disc atomizer, and a plurality of scholars do corresponding research on the diameter of the atomized liquid drop.
At present, the methods such as laser interference chromatography, LDA method, laser diffraction method and the like are mainly used for particle size measurement, so that higher measurement accuracy is obtained, but the methods are high in manufacturing cost. The laser holography has high measurement precision, is most affected by the perfusion and the trust of people, but the limitations of the laser holography are gradually appeared along with the research penetration, wherein the accurate measurement of the particle size is one of the difficulties which plague the whole system technology. At present, the digital image processing is adopted to process 5 steps of graying, reverse color, binarization, digital morphology processing and liquid drop statistics in the process of measuring the atomization particle size, the method can provide parameters required by force analysis, morphological parameters and statistical parameters of single liquid drop, but the liquid drop is not screened, and the diameter of the liquid drop cannot be accurately obtained.
Disclosure of Invention
The invention aims to provide an atomized particle size measuring method and system, and solves the technical problem that the diameter of liquid drops cannot be accurately obtained because liquid drops are not screened in the prior art.
The invention provides an atomization particle size measuring method, which comprises the following steps:
establishing a database in a server, and storing an experimental image and a background image;
reading a background image and an experimental image, deleting an original background in the experimental image, and acquiring a liquid drop atomization image;
carrying out gray processing on the liquid drop atomization image;
median filtering, and carrying out image binarization to obtain a binarized image of the atomization area;
filling the binary image to obtain a pattern filling closed image, and calibrating the pattern;
screening the calibrated graph to obtain an ideal liquid drop model;
and calculating the diameter of the ideal liquid drop model to obtain the diameter of the liquid drop.
In some embodiments, the method of graphical calibration is as follows: and searching a closed graph boundary on the graph filling closed image by adopting an eight-field connection principle, and calibrating the closed graph by different colors to obtain a calibrated graph.
In some embodiments, the database further stores threshold values, and the method for screening the calibrated graph comprises:
obtaining the area A and the perimeter P of a calibration graph;
calculating the roundness of the calibration graph according to a calculation formula of the roundness, wherein m =4 pi 2 So as to obtain the circular degree m,
reading the threshold value, comparing m with the threshold value,
when m is larger than or equal to the threshold value, the image corresponding to m is an ideal liquid drop model.
In certain embodiments, the threshold value ranges from 0.65 to 0.75.
In some embodiments, the area a of the calibration pattern is the total number of pixels in each region of the calibration pattern.
In some embodiments, the perimeter P of the calibration graph is the longest distance that fully encloses the graph, and the specific method for calculating the perimeter of the graph is as follows:
firstly, boundary coordinates of a calibration graph are obtained,
using a formula of distance between two points for two continuous coordinates
And then summing all d in the calibration graph, wherein the obtained result is the perimeter P of the calibration graph.
In certain embodiments, the diameter of the ideal droplet model is calculated as follows:
and (3) calculating the measured diameter phi of the liquid drop by the following formula: Φ =4 × a/P, a and P being the area and perimeter of the calibration graph, respectively;
calculating a scale k, wherein the calculation process of the scale k is as follows: calibrating a circular object with a known diameter to obtain a measured diameter D2 of the circular object, wherein the diameter of the circular object is D1, and solving a scale k = D1/D2;
the diameter of the droplet D = k Φ is calculated.
The atomized particle size measuring system based on the atomized particle size measuring method comprises terminal equipment, an atomizing device, a high-speed camera and a halogen lamp,
the terminal equipment is used as a server, and an application program for realizing the atomized particle size measurement method is installed on the terminal equipment;
a rotatable disc body for atomization is arranged in the atomization device;
the high-speed camera is in communication connection with the terminal equipment, is arranged on the atomization device, shoots the disk body before work and the edge of the disk body and transmits the disk body to the terminal equipment to be stored as a background image, and shoots the disk body during work and transmits the disk body edge to the terminal equipment to be stored as an experimental image;
the halogen lamp is arranged on the side surface of the atomizing device and is opposite to the disc body from the side surface.
The operation method of the atomized particle size measurement system comprises the following steps:
placing the system based on the atomized particle size measurement method in a dark room;
turning on the halogen lamp to face the tray body from the side;
opening the high-speed camera to enable the high-speed camera to clearly shoot the edge of the turntable;
opening the atomizing device, and throwing a liquid film on the disc body out in the rotating process of the disc body to form liquid drops;
continuously shooting by a high-speed camera, and storing pictures formed by shooting to terminal equipment;
and (3) installing an atomized particle size measuring method on the terminal equipment to calculate the diameter of the liquid drop.
The method and the system for measuring the atomized particle size have the advantages that: the method has the advantages that the steps are reasonable, the phenomenon that the diameter of the liquid drop is inaccurate due to the fact that the liquid column, the liquid drop and the liquid column liquid drop are entangled in the disc atomization process can be effectively avoided, and the accuracy of the calculated diameter of the liquid drop is improved.
Drawings
FIG. 1 is a flow chart of a method of atomized particle size measurement in one embodiment of the invention;
FIG. 2 is an experimental image of a method of measuring a particle size by atomization in accordance with an embodiment of the present invention;
FIG. 3 is a median filtered image of a method of haze particle size measurement according to an embodiment of the present invention;
FIG. 4 is a binarized image of a method for measuring a particle size by atomization according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an atomization measurement system using an atomization particle size measurement method according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a spindle according to an embodiment of the present invention;
FIG. 7 is an experimental image of the disc at a rotation speed of 200r/min according to an embodiment of the present invention;
FIG. 8 is an experimental image of a disc rotating at 400r/min according to an embodiment of the present invention;
FIG. 9 is an experimental image of a disc rotating at a speed of 600r/min according to an embodiment of the present invention;
FIG. 10 is an experimental image of a disc rotating at 800r/min according to an embodiment of the present invention;
FIG. 11 is a bar graph of particle size distribution at a disc rotation speed of 200r/min in accordance with an embodiment of the present invention;
FIG. 12 is a bar graph of particle size distribution at a disc rotation speed of 400 rpm in accordance with an embodiment of the present invention;
FIG. 13 is a bar graph of particle size distribution at a disc rotation speed of 600 rpm in accordance with one embodiment of the present invention;
FIG. 14 is a bar graph of particle size distribution at a disc rotation speed of 800r/min in accordance with an embodiment of the present invention;
FIG. 15 is a line graph showing the variation of the atomized average particle size of the disk at various rotation speeds of 200-800r/min in one embodiment of the present invention.
Detailed Description
As shown in fig. 5 and fig. 6, the atomization particle size measuring system includes a terminal device 8, a halogen lamp 1, a high-speed camera 6, and an atomization device based on a rotating disk body, the terminal device 8 is used as a server, and an application program for implementing the atomization particle size measuring method is installed on the terminal device 8, the terminal device 8 and the high-speed camera 6 form a communication connection through a network cable, wherein the terminal device 8 is a computer, and the network cable can adopt a super-six gigabit network cable, so that the atomization measuring system based on the rotating disk body can be better adapted to transmit huge data volume,
the high-speed camera 6 is erected above the atomizing device based on the rotary disc body through a camera support frame 7, wherein the high-speed camera 6 adopts a FASTCAM Mini UX50 compact high-light-sensitive CCD high-speed camera, the maximum support is 1280 pixels by 1024 pixels, 2000 frames are continuously shot every second under the mode of 10 mu m of resolution,
the atomization device based on the rotary disk body comprises a power device for controlling the rotation of the disk body 9, the rotatable disk body 9 for atomization, an external frame 5, a main shaft 10 and a supply device for supplying liquid, wherein a high-speed camera 6 is aligned with the disk body 9,
the supply device comprises a liquid storage barrel 2 and a pump 3, the pump 3 is arranged in the liquid storage barrel 2, a liquid outlet of the pump 3 is connected with one end of a liquid supply pipe 4,
the power device is connected with the outer frame 5 by screws, the upper end of the main shaft 10 is connected with the outer frame 5 by a bearing, the lower end of the main shaft 10 is connected with the outer frame 5 by a bearing, the disc body 9 is sleeved on the main shaft 10, the disc body 9 rotates along with the main shaft 10, the bottom of the main shaft 10 is connected with the power device, the outer frame 5 around the disc body 9 is provided with a transparent baffle plate 11, the transparent baffle plate 11 is a transparent acrylic plate which can block liquid splashed outwards and reduce the influence of the experiment on the surrounding environment,
as shown in fig. 2, the spindle 10 is provided with 1 liquid guiding hole 101 with an upward opening, and 2-6 liquid outlet holes 102, the liquid guiding hole 101 is disposed at a middle position of the spindle 10, the liquid outlet holes 102 are disposed above the tray 9, the liquid outlet holes 102 are uniformly distributed on the spindle 10 in a circumferential direction with an axis of the spindle 10 as a center, the liquid outlet holes 102 are communicated with the liquid guiding holes 101, the other end of the liquid supply pipe 4 is inserted into the liquid guiding hole 101 through the opening, the liquid supply device supplies liquid to the tray 9 through the liquid supply pipe 4, the liquid guiding holes 101 and the liquid outlet holes 102, the high-speed camera 6 is used for photographing edges of the tray 9 and the tray 9, wherein the tray 9 is circular, the spindle 10 is disposed at a center of the tray 9,
the power device comprises a motor 12, a first belt pulley, a second belt pulley and a belt, wherein the motor 12 is connected with the outer frame 5, the first belt pulley is arranged on an output shaft of the motor 12, the second belt pulley is arranged at the lower end of the main shaft 10, the belt is arranged between the first belt pulley and the second belt pulley and used for power transmission, and the stability of the atomization device based on the rotary disc body in operation is enhanced through belt transmission;
the halogen lamp 1 is arranged on the side of the atomizer device based on a rotating disk, facing the disk 9 from the side.
The operation method of the atomized particle size measurement system comprises the following steps:
step 1, placing an atomization measuring system based on a rotary disc body in a darkroom;
and 7, continuously shooting by the high-speed camera 6, storing the shot pictures on the terminal equipment 8, forming experimental images, and measuring the particle size.
The test equipment can be better protected by performing the step 3 and then performing the steps 4 and 5.
When the position of the high-speed camera 6 is not changed in step 3, the terminal device 8 may continue to use the background image stored in the terminal device 8, and once the high-speed camera 6 is changed, after the high-speed camera 6 is fixed, before water is supplied into the spindle 10, the high-speed camera is required to take a picture against the atomizing device based on the rotating disk body to replace the background image stored in the terminal device 8, so as to form a new background image.
Particle size measurement is performed on the terminal device 8, as shown in fig. 1, and the method of particle size measurement includes the steps of:
step a, a database is established in a reading terminal device 8, and a background image, an experimental image and a threshold value are stored, wherein the experimental image is shown in fig. 2, the background image is subtracted from the experimental image through image operation to form image subtraction, and a liquid drop atomization image is obtained;
step b, carrying out gray processing on the acquired liquid drop atomization image by adopting an Rgb2gray function, eliminating redundant background colors and obtaining a gray image of an atomization area;
c, performing median filtering on the gray image by adopting a medfilt function to form a median filtering image, eliminating noise points and enhancing contrast as shown in fig. 3, and then performing binarization processing by adopting an im2bw function to obtain a binarization image of the atomization area, wherein the binarization image is shown in fig. 4;
d, filling the binary image by adopting an imfill function of MATLAB to obtain a pattern filled closed image;
step e, searching a closed graph boundary on the graph filling closed image by adopting an eight-field connection principle, and calibrating the closed graph by different colors to obtain a calibrated graph;
step f, obtaining basic attributes of the calibration graph by adopting a regionprops function of MATLAB, wherein the basic attributes comprise a mass center and an area, and the area is the total number of pixels of each region of the calibration graph and is marked as A;
step g, calculating the perimeter of the calibration graph, wherein the perimeter is the longest distance for fully wrapping the graph, and the specific method for calculating the perimeter of the graph is as follows:
firstly, boundary coordinates of a calibration graph are obtained,
using a formula of distance between two points for two continuous coordinates
Then, summing all d in the calibration graph, wherein the obtained result is the perimeter of the calibration graph and is marked as P;
step h, screening the calibration graph through a roundness distinguishing strategy, avoiding the phenomenon that the diameter of liquid drops is inaccurate due to liquid columns, liquid drops and liquid column liquid drops intertwining in the disc atomization process, wherein the specific screening process is as follows:
calculating a calibration chartThe roundness of the shape is read, A calculated in the step f and P calculated in the step g are read, and the roundness is calculated according to a calculation formula of m =4 pi A/P 2 So as to obtain the circular degree m,
reading the threshold value stored in the terminal device 8, and comparing m with the threshold value, wherein the value range of the threshold value is 0.65-0.75,
when the roundness m is larger than or equal to the threshold value, an image corresponding to the roundness m is an ideal liquid drop model;
step i, calculating the diameter of the liquid drop to obtain the diameter D of the liquid drop according to the ideal liquid drop model, wherein the calculation process of the diameter of the liquid drop is as follows:
and (3) calculating the measured diameter phi of the liquid drop by the following formula: Φ =4 a/P;
calculating a scale k, wherein the calculation process of the scale k is as follows: calibrating a circular object with a known diameter to obtain a measured diameter D2 of the circular object, wherein the diameter of the circular object is D1, and solving a scale k = D1/D2;
the diameter of the droplet D = k x Φ is calculated.
Particle size measurement experiments are carried out by controlling the rotating speed of the disc body 9 to be 200-800r/min according to the operation method and the particle size measurement method of the atomization particle size measurement system, the experimental images corresponding to the rotating speeds of 200r/min, 400r/min, 600r/min and 800r/min are respectively shown in fig. 7, 8, 9 and 10, the particle size distribution bar charts at the rotating speeds of 200r/min, 400r/min, 600r/min and 800r/min are respectively shown in fig. 11, 12, 13 and 14, and the line graph of the change of the average particle size of disc atomization at each rotating speed of 200-800r/min is shown in fig. 15.
The foregoing is only a preferred form of the invention and it should be noted that several similar variations and modifications could be made by one skilled in the art without departing from the inventive concept and these should also be considered within the scope of the invention.
Claims (6)
1. An atomized particle size measuring method is characterized by comprising the following steps:
establishing a database in a server, and storing the experimental image and the background image;
reading a background image and an experimental image, deleting an original background in the experimental image, and acquiring a liquid drop atomization image;
carrying out gray processing on the liquid drop atomization image;
median filtering and image binaryzation are carried out to obtain a binaryzation image of the atomization area;
filling the binary image to obtain a pattern filling closed image, and calibrating the pattern, wherein the pattern calibrating method comprises the following steps: searching a closed graph boundary on a graph filling closed image by adopting an eight-field connection principle, and calibrating the closed graph by different colors to obtain a calibrated graph;
screening the calibrated graph to obtain an ideal liquid drop model; the database also stores threshold values, and the method for screening the calibrated graph comprises the following steps: obtaining the area A and the perimeter P of a calibration graph, calculating the roundness of the calibration graph, obtaining the roundness m according to a calculation formula of the roundness, reading a threshold value, comparing the m with the threshold value, and when the m is larger than or equal to the threshold value, taking an image corresponding to the m as an ideal liquid drop model;
and calculating the diameter of the ideal liquid drop model to obtain the diameter of the liquid drop, wherein the method for calculating the diameter of the ideal liquid drop model comprises the following steps: and (3) calculating the measured diameter phi of the liquid drop by the following formula: Φ =4 × a/P, a and P being the area and perimeter of the calibration graph, respectively; calculating a scale k, wherein the calculation process of the scale k is as follows: calibrating a circular object with a known diameter to obtain a measured diameter D2 of the circular object, wherein the diameter of the circular object is D1, and solving a scale k = D1/D2; the diameter of the droplet D = k Φ is calculated.
2. The atomized particle size measurement method according to claim 1, wherein the threshold value is in a range of 0.65 to 0.75.
3. The aerosol particle size measuring method according to claim 1, wherein the area a of the calibration pattern is the total number of pixels in each region of the calibration pattern.
4. The atomized particle size measurement method according to claim 1, wherein the perimeter P of the calibration graph is the longest distance that fully wraps the graph, and the method for calculating the perimeter of the graph specifically comprises the following steps:
firstly, the boundary coordinates of a calibration graph are obtained,
using a formula of distance between two points for two continuous coordinates
，
And then summing all d in the calibration graph, wherein the result is the perimeter P of the calibration graph.
5. An atomized particle size measuring system based on the atomized particle size measuring method according to any one of claims 1 to 4, comprising a terminal device, an atomizing means, a high-speed camera, and a halogen lamp,
the terminal equipment is used as a server, and an application program for realizing the atomization particle size measuring method is installed on the terminal equipment;
a rotatable disc body for atomization is arranged in the atomization device;
the high-speed camera is in communication connection with the terminal equipment, is arranged on the atomization device, shoots the disk body before work and the edge of the disk body and transmits the disk body to the terminal equipment to be stored as a background image, and shoots the disk body during work and transmits the disk body edge to the terminal equipment to be stored as an experimental image;
the halogen lamp is arranged on the side surface of the atomizing device and is opposite to the disc body from the side surface.
6. The atomized particle size measurement system of claim 5, wherein the method of operating the atomized particle size measurement system comprises the steps of:
placing the atomized particle size measuring system in a dark room;
turning on the halogen lamp to face the tray body from the side;
opening the high-speed camera to enable the high-speed camera to clearly shoot the edge of the turntable;
opening the atomizing device, and throwing a liquid film on the disc body out in the rotating process of the disc body to form liquid drops;
continuously shooting by a high-speed camera, and storing pictures formed by shooting to terminal equipment;
and (3) installing an atomized particle size measuring method on the terminal equipment to calculate the diameter of the liquid drop.
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