CN111220588B - Flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness - Google Patents
Flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness Download PDFInfo
- Publication number
- CN111220588B CN111220588B CN202010215085.0A CN202010215085A CN111220588B CN 111220588 B CN111220588 B CN 111220588B CN 202010215085 A CN202010215085 A CN 202010215085A CN 111220588 B CN111220588 B CN 111220588B
- Authority
- CN
- China
- Prior art keywords
- oil film
- silicone oil
- water body
- fluorescent
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
Abstract
The invention discloses a flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness, which is characterized in that images of fluorescent pigment silicone oil generated by ultraviolet irradiation under at least two different known oil film thicknesses above a water body are respectively obtained, and the images are analyzed to obtain gray values corresponding to the fluorescent intensity; calculating according to the known oil film thickness and the gray value to obtain an oil film thickness-gray value relation; and calculating the fluctuation condition of the radiation aggregation and dispersion of the silicone oil with fluorescent pigment on the surface of the water body according to the fluorescent image and the oil film thickness-gray value relation of the silicone oil shot under the conditions of the water body when the water body is static and when the water body is disturbed respectively. The method of the invention enhances the intuitiveness of detection, has low cost, small data quantity to be processed, simple post-processing steps and greatly reduced difficulty. The method is convenient for quantitatively analyzing the intensity of the radiation and dispersion fluctuation of the surface fluid, and has a certain help to summarize the law of the radiation and dispersion phenomenon of the fluid surface caused by underwater or water navigation bodies.
Description
Technical Field
The invention relates to the field of hydrodynamic force analysis, in particular to a flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness.
Background
In nature, sea water can generate various fluctuation due to natural factors such as wind, attraction and geological conditions. When an underwater or water craft passes, a radiation-gathering and scattering phenomenon (such as kelvin waves and internal wave-mapping waves) with obvious texture features is formed on the water surface. Because the space scale of the trace generated by the navigation body passing is quite large, the special flow field features can become an important signal source for judging whether the underwater or water surface moving object passes or not, so that the related technology in the field has great military significance and engineering practical significance for exploring and tracking the underwater and water surface moving object.
Among the existing experimental methods for exploring the wave form of the surface of a fluid, the optical method is favored by researchers because of its interference resistance, non-contact and transiently. The traditional optical methods include a dyeing dominant technology, a shadow photography technology, a schlieren technology and the like, and the experimental results generated by observing the flow field by the traditional optical methods are visual images, so that the traditional optical methods are not suitable for carrying out accurate quantitative calculation and analysis on the traditional optical methods. New optical flow field measurement techniques have been developed, wherein experimental observations of flow field fluctuations using Particle Image Velocimetry (PIV) are the more dominant method. PIV technology mainly relies on scattering trace particles following fluid movement on the surface of fluid, illuminating the detected flow field area by a laser sheet light source parallel to the surface of fluid, scattering light from the tiny particles into a camera perpendicular to the surface of fluid, and obtaining flow information about the flow field after processing. The technology is mature and widely applied to the field of fluid mechanics and marine dynamics, and the experimental effect and advantages are self-evident. But its drawbacks are also very evident: PIV technology has certain limitations and cannot accurately measure the fluctuation amplitude; the PIV technology has very high requirements on experimental instruments for collecting flow field information, and an expensive double-shutter camera is often required, so that the experimental cost is increased; the experimental data obtained by the PIV technology is complex, the post-processing steps are complex, and long time is often required to process the data to obtain the final experimental result.
Currently, the detection method of the fluid surface fluctuation morphology is basically Particle Image Velocimetry (PIV). The principle is that trace particles are artificially added into a measured flow field, ultraviolet light is adjusted to be a sheet-shaped light source, the flow field is illuminated in the direction parallel to the flow field, the trace particles moving along the flow field scatter laser to a camera vertical to the water surface direction, and then trace particle images obtained by the camera are processed to obtain flow field speed images. Therefore, the PIV technology reflects the fluctuation condition of the fluid surface through the motion condition of the trace particles, can only analyze the fluctuation form of the fluid surface, and cannot accurately judge the fluctuation amplitude and other aspects; in addition, the PIV technology requires a higher-precision image collecting device (camera) and trace particles with high following performance, so that the experiment cost is increased; in addition, the PIV experiment is complex in steps, and the data obtained after the experiment is finished are more complicated, so that more time is needed in the post-treatment stage, and the more difficult the post-treatment is.
In view of this, it is important to design a new method for detecting the flow field fluctuation pattern.
Disclosure of Invention
Aiming at the problems of high experimental cost, complex steps, complex finally obtained data, high post-treatment difficulty and the like of the prior detection method. The embodiment of the application aims to provide a flow field radial aggregation and dispersion measurement method based on oil film fluorescence brightness, so as to solve the technical problems mentioned in the background art section.
The embodiment of the application provides a flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness, which comprises the following steps:
s1: respectively obtaining images of fluorescent pigment silicone oil generated by ultraviolet irradiation under at least two different known oil film thicknesses above a water body, and analyzing the images to obtain gray values corresponding to the fluorescent intensity;
s2: calculating according to the known oil film thickness and the gray value to obtain an oil film thickness-gray value relation; and
s3: and calculating the fluctuation condition of the radiation aggregation and scattering of the silicone oil with the fluorescent pigment on the surface of the water body according to the fluorescent image and the oil film thickness-gray value relation of the silicone oil shot under the conditions of the water body when the water body is static and when the water body is disturbed respectively.
When the thickness of the oil film changes due to fluctuation of the liquid level, the ultraviolet-induced fluorescence intensity changes, and the purpose of observing the radiation aggregation and radiation scattering phenomenon on the surface of the fluid is achieved by measuring the fluorescence intensity. The method has the advantages of low cost and simple steps, can more intuitively reflect the fluctuation characteristics of the fluid surface, is convenient for researchers to quantitatively analyze the fluctuation characteristics, and has certain reference value for the search and detection of underwater and water surface aircrafts.
In some embodiments, step S1 specifically includes:
s11: configuring silicon oil with fluorescent pigment in a transparent vessel at a certain height, and placing the transparent vessel in a container so that the horizontal symmetry line of the silicon oil in the transparent vessel is level with the surface of a water body in the container;
s12: shooting an image of fluorescence generated by the silicone oil under the irradiation of ultraviolet light by an optical camera perpendicular to the surface of the silicone oil;
s13: analyzing gray values corresponding to fluorescence in the image; and
s14: and respectively performing steps S11-S13 under at least two different known oil film thicknesses to obtain corresponding different gray values under the different known oil film thicknesses.
The relation between the oil film thickness and the gray value is conveniently established by measuring the images and the gray value of the images which are generated by ultraviolet excitation of the silicone oil with fluorescent pigment under different oil film thicknesses.
In some embodiments, the horizontal symmetry line of the silicone oil is recorded as a reference height with respect to the height above the container. Since the intensity of the fluorescence is related to the ultraviolet irradiation distance, measurement at the same reference height can reduce the influence and error of the irradiation distance on measurement.
In some embodiments, step S3 specifically includes:
s31: spreading silicone oil with fluorescent pigment in a transparent vessel on the surface of a water body to ensure that the surface height of the silicone oil is consistent with the reference height;
s32: respectively irradiating silicone oil through ultraviolet light when a water body is static and is disturbed, shooting by an optical camera perpendicular to the surface of the silicone oil to obtain fluorescent images of the silicone oil when the water body is static and is disturbed, and calculating to obtain gray values of the fluorescent images when the water body is static and is disturbed;
s33: combining the relation of the oil film thickness and the gray value, and calculating the corresponding oil film thickness according to the gray values of the fluorescent images when the fluorescent images are static and disturbed; and
s34: and (3) carrying out post-treatment on the gray values of the fluorescent images when the fluorescent pigment is static and when the fluorescent pigment is disturbed, so as to obtain the fluctuation condition of radiation aggregation and radiation scattering of the silicone oil with the fluorescent pigment on the surface of the water body.
And further obtaining the fluctuation condition of the spoke-gather radiation of the water surface by measuring the thickness change of the oil film when the water body is static and is disturbed.
In some embodiments, the heights of the optical camera shots of step S32 and step S12 remain the same, as does the height of the ultraviolet light illumination. Therefore, errors caused by the shooting of the optical camera and the ultraviolet irradiation distance can be reduced.
In some embodiments, when the optical camera is a color camera, RGB channel data of the color camera are respectively extracted as gray values to respectively calculate, and the oil film thickness of the silicone oil when the water body is disturbed is an average value of the oil film thicknesses of the silicone oil when the water body is disturbed according to the RGB channel data. The method can shoot through a color camera as well, and compared with the PIV technology which needs to use a double-shutter camera with high price, the method greatly reduces the detection cost and increases the feasibility of experiments.
In some embodiments, the oil film thickness-gray value relationship comprises a linear relationship constant. According to the rule that the fluorescence signal intensity and the fluorescence oil film thickness are in linear relation in the Lambert-Beer law, the stronger the fluorescence signal intensity is, the thicker the fluorescence oil film is relatively. Therefore, according to the fluorescence intensity, the fluctuation condition of the fluid surface can be obtained, so that the data required to be processed in the experiment is fewer, the post-processing step is simplified, and compared with the PIV technology, the method and the device have the advantages that a large amount of complicated data are required to be processed, and the post-processing time is greatly shortened.
In some embodiments, the concentration of fluorescent pigment in the silicone oil with fluorescent pigment is 0.3g/L. At this concentration, the silicone oil solution appeared translucent and had a distinct fluorescence phenomenon after excitation, which was considered the optimal state.
In some embodiments, the body of water comprises a saline solution having a stable density stratification. Under the condition, the environment of seawater in the ocean can be simulated, so that the measurement is more accurate.
According to the invention, the radiation aggregation and scattering phenomenon on the surface of the fluid is indirectly detected by utilizing the rule that the fluorescence signal intensity and the fluorescence oil film thickness form a linear relation, compared with the existing Particle Image Velocimetry (PIV), the method has the advantages that the fluorescent pigment with less metering is dissolved in the solvent silicone oil to generate stronger fluorescence, the phenomenon is visual and obvious, the fluctuation condition of a detected water area can be obtained by using a common optical camera, and compared with the PIV technology which needs to use a double-shutter camera with high price, the method greatly reduces the detection cost and increases the feasibility of experiments. According to the rule that the fluorescence signal intensity and the fluorescence oil film thickness are in linear relation in the Lambert-Beer law, the stronger the fluorescence signal intensity is, the thicker the fluorescence oil film is relatively. Therefore, according to the fluorescence intensity, the fluctuation condition of the fluid surface can be obtained, so that the data required to be processed in the experiment is fewer, the post-processing step is simplified, and compared with the PIV technology, the method and the device have the advantages that a large amount of complicated data are required to be processed, and the post-processing time is greatly shortened. On one hand, the method can analyze the morphology of the flow field surface wave, on the other hand, the method can directly obtain the related data of the fluctuation amplitude, and the limitation of the PIV technology in the aspect of detecting the fluctuation amplitude is solved. The optical filter is arranged on the camera to only receive the visible light of the excitation fluorescence wave band, so that the influence of the visible light of other wave bands on experimental data and experimental results in the experimental process is eliminated, the interference from the surrounding environment is smaller, the limit on the detection environment is lower, and the experimental results are more accurate. The invention is suitable for the detection experiment of the spoke-gather radiation field in a large water area, and provides a reference scheme for detecting whether an underwater or water surface navigation body passes.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and 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 flow field spoke-gather irradiance measurement method based on oil film fluorescence brightness according to an embodiment of the invention;
fig. 2 is a schematic flow chart of step S1 of a flow field spoke-gather irradiance measurement method based on oil film fluorescence brightness according to an embodiment of the invention;
FIG. 3 is a schematic diagram of reference height measurement of a flow field spoke-gather irradiance measurement method based on oil film fluorescence brightness according to an embodiment of the invention;
FIG. 4 is a schematic flow chart of step S3 of a flow field spoke-gather irradiance measurement method based on oil film fluorescence brightness according to an embodiment of the invention;
fig. 5 is a schematic diagram of an apparatus used in a flow field spoke-gather irradiance measurement method based on oil film fluorescence brightness according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, 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 applicant of the invention finds out that the research of detecting the water surface spilled oil by ultraviolet-induced fluorescence is useful in the field of detecting the ocean spilled oil. The detection method irradiates the oil spilled on the sea surface with ultraviolet light, fluorescent substances in the oil are stimulated to generate fluorescent phenomena, and the position and the range of the oil spilled can be judged through a fluorescent area. And according to Lambert-Beer law, the intensity of the fluorescence signal induced to be excited is in linear relation with the thickness of the fluorescence oil film. By combining the characteristics of the two aspects, the fluorescent oil film can be designed to be flatly paved on the surface of the fluid, and the thickness of the fluorescent oil film is expressed by the intensity of ultraviolet-induced fluorescence, so that the fluctuation data of the surface of the fluid is obtained. The research of detecting ocean oil spill by ultraviolet induced fluorescence and Lambert-Beer law make the method for detecting radiation aggregation and radiation scattering phenomenon on the surface of fluid possible.
The embodiment of the application discloses a flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness, which is shown in fig. 1 and comprises the following steps:
s1: respectively obtaining images of fluorescent pigment silicone oil generated by ultraviolet irradiation under at least two different known oil film thicknesses above a water body, and analyzing the images to obtain gray values corresponding to the fluorescent intensity;
s2: calculating according to the known oil film thickness and the gray value to obtain an oil film thickness-gray value relation; and
s3: and calculating the fluctuation condition of the radiation aggregation and scattering of the silicone oil with the fluorescent pigment on the surface of the water body according to the fluorescent image and the oil film thickness-gray value relation of the silicone oil shot under the conditions of the water body when the water body is static and when the water body is disturbed respectively.
When the thickness of the oil film changes due to fluctuation of the liquid level, the ultraviolet-induced fluorescence intensity changes, and the purpose of observing the radiation aggregation and radiation scattering phenomenon on the surface of the fluid is achieved by measuring the fluorescence intensity. The method has the advantages of low cost and simple steps, can more intuitively reflect the fluctuation characteristics of the fluid surface, is convenient for researchers to quantitatively analyze the fluctuation characteristics, and has certain reference value for the search and detection of underwater and water surface aircrafts.
In a specific embodiment, as shown in fig. 2, step S1 specifically includes:
s11: configuring silicon oil with fluorescent pigment in a transparent vessel at a certain height, and placing the transparent vessel in a container so that the horizontal symmetry line of the silicon oil in the transparent vessel is level with the surface of a water body in the container;
s12: shooting an image of fluorescence generated by the silicone oil under the irradiation of ultraviolet light by an optical camera perpendicular to the surface of the silicone oil;
s13: analyzing gray values corresponding to fluorescence in the image; and
s14: and respectively performing steps S11-S13 under at least two different known oil film thicknesses to obtain corresponding different gray values under the different known oil film thicknesses.
In step S11, it is estimated that the measurement of the fluorescent pigment and the silicone oil is required based on the area of the observation water area (i.e., the area of the experimental water tank), and the fluorescent pigment is dissolved in the silicone oil to prepare a silicone oil solution of the fluorescent pigment. In a preferred embodiment, the concentration of fluorescent pigment in the silicone oil with fluorescent pigment is about 0.3g/L. At this time, the silicone oil solution is semitransparent and has obvious fluorescence phenomenon after being excited, and is regarded as an optimal state. In addition, the fluorescent dye is selected from nontoxic and harmless substances with hydrophobic and oleophilic properties, and the silicone oil is selected from the types which are nontoxic and harmless and have a surface tension lower than that of water. The relation between the oil film thickness and the gray value is conveniently established by measuring the images and the gray value of the images which are generated by ultraviolet excitation of the silicone oil with fluorescent pigment under different oil film thicknesses.
In a specific embodiment, the horizontal symmetry line of the silicone oil is recorded as a reference height with respect to the height above the container. Since the intensity of the fluorescence is related to the ultraviolet irradiation distance, measurement at the same reference height can reduce the influence and error of the irradiation distance on measurement. Because of the limitation of the conditions, the specific technical scheme is based on a detection method of radial aggregation and dispersion measurement of a flow field in a laboratory. Under laboratory conditions, the transparent vessel may be a beaker, the container may be a water jar, and the certain height in step S11 is selected to be 10cm. Therefore, a silicone oil solution of fluorescent pigment with the height of 10cm can be prepared in a beaker as a reference height measurement solution, and the height of the silicone oil solution on the experimental water cylinder corresponding to the horizontal symmetry line is recorded. The specific process is shown in fig. 3, a beaker is placed in an empty water tank, then the beaker is raised to a height close to the estimated water discharge height of the water tank, and the water tank is marked with a height corresponding to 5cm of high silicone oil solution (horizontal central symmetry line of 10cm of high silicone oil solution) in the beaker. Of course, other heights of silicone oil solutions may be selected.
The ultraviolet lamp uses ultraviolet rays with the wave band of 365nm, so that the light of the ultraviolet lamp is fully covered on the beaker. The light source wave band used by the ultraviolet lamp is not limited to 365nm, and ultraviolet light can be used. The camera port of the optical camera was vertically aligned with the liquid surface of the beaker, and a 524nm filter (receiving only green light) was attached to the optical camera port for filtering, and an image of when the solution produced fluorescence at this time was recorded and the gray value g10 was extracted. The camera used may be a color camera, and RGB channels thereof may be extracted when analyzing the color camera image, respectively, and three sets of data may be recorded r10, g10, b10. The optical filter is arranged on the camera to only receive the visible light of the excitation fluorescence wave band, so that the influence of the visible light of other wave bands on experimental data and experimental results in the experimental process is eliminated, the interference from the surrounding environment is smaller, the limit on the detection environment is lower, and the experimental results are more accurate. And (3) repeating the step S11 to prepare silicone oil solutions of fluorescent pigments with other heights, keeping the heights of the horizontal symmetry lines of the silicone oil solutions consistent with the heights of the horizontal symmetry lines of the step S11, specifically, adjusting the heights of the beakers to enable the central horizontal line of the silicone oil solutions with other heights to be the same as the reference height, and repeating the steps S12-S13 to observe the gray value g20, wherein the other heights are equivalent to at least two different known oil film thicknesses. The camera used may be a color camera, and RGB channels thereof may be extracted when analyzing the color camera image, respectively, and three sets of data may be recorded r20, g20, b20. The fluorescent oil film thickness-gray scale linear relationship expression F is then established by applying post-processing software (matlab, originPro, etc.).
In a specific embodiment, as shown in fig. 4, step S3 specifically includes:
s31: spreading silicone oil with fluorescent pigment in a transparent vessel on the surface of a water body to ensure that the surface height of the silicone oil is consistent with the reference height;
s32: respectively irradiating silicone oil through ultraviolet light when a water body is static and is disturbed, shooting by an optical camera perpendicular to the surface of the silicone oil to obtain fluorescent images of the silicone oil when the water body is static and is disturbed, and calculating to obtain gray values of the fluorescent images when the water body is static and is disturbed;
s33: combining the relation of the oil film thickness and the gray value, and calculating the corresponding oil film thickness according to the gray values of the fluorescent images when the fluorescent images are static and disturbed; and
s34: and (3) carrying out post-treatment on the gray values of the fluorescent images when the fluorescent pigment is static and when the fluorescent pigment is disturbed, so as to obtain the fluctuation condition of radiation aggregation and radiation scattering of the silicone oil with the fluorescent pigment on the surface of the water body.
And further obtaining the fluctuation condition of the spoke-gather radiation of the water surface by measuring the thickness change of the oil film when the water body is static and is disturbed.
In a specific embodiment, the heights of the optical cameras of step S32 and step S12 are kept uniform, and the heights of the ultraviolet light irradiation are also kept uniform. Therefore, errors caused by the shooting of the optical camera and the ultraviolet irradiation distance can be reduced.
In a specific embodiment, when the optical camera is a color camera, RGB channel data of the color camera are respectively extracted as gray values to respectively calculate, and the oil film thickness of the silicone oil when the water body is disturbed is an average value of the oil film thicknesses of the silicone oil when the water body is disturbed, which are respectively calculated according to the RGB channel data. The method can shoot through a color camera as well, and compared with the PIV technology which needs to use a double-shutter camera with high price, the method greatly reduces the detection cost and increases the feasibility of experiments.
In a specific embodiment, the oil film thickness-gray value relationship comprises a linear relationship constant. According to the rule that the fluorescence signal intensity and the fluorescence oil film thickness are in linear relation in the Lambert-Beer law, the stronger the fluorescence signal intensity is, the thicker the fluorescence oil film is relatively. Therefore, according to the fluorescence intensity, the fluctuation condition of the fluid surface can be obtained, so that the data required to be processed in the experiment is fewer, the post-processing step is simplified, and compared with the PIV technology, the method and the device have the advantages that a large amount of complicated data are required to be processed, and the post-processing time is greatly shortened.
In particular embodiments, the body of water comprises a saline solution having a stable density stratification. Under the condition, the environment of seawater in the ocean can be simulated, so that the measurement is more accurate. Fluorescent images are shot under the conditions of static water and disturbed water under laboratory conditions, so that a disturbance source is placed under water, and disturbance can be generated on the experimental water by placing the underwater disturbance source later, so that density layering of the experimental water is broken. According to the experimental requirement, saline solution with corresponding salinity is prepared. And then slowly inputting pure water on the basis of the saline solution, controlling the position of the horizontal line on the surface of the experimental water body at a position slightly lower than the reference height, and standing for a certain time to ensure that the experimental water body has stable density delamination. The standing time is generally set to 12h, and is adjusted according to the size of the water body. An ultraviolet lamp with a wavelength band of 365nm was also used, the light of which was fully irradiated on the fluorescent oil film on the fluid surface in the measured range. The camera opening of the optical camera is vertically aligned with a horizontal flow field to be detected, the shooting height of the optical camera is kept consistent, a 524nm optical filter (only receiving green light) is arranged on the optical camera opening to filter light, an image when the solution generates fluorescence at the moment is recorded, and a gray value g1 is extracted. The camera used may be a color camera, and RGB channels thereof may be extracted when analyzing the color camera image, respectively, and three sets of data may be recorded r1, g1, b1.
According to experimental requirements, the disturbance source parameters are adjusted, and the disturbance source is started to enable the surface of the water body to fluctuate. At this time, the fluorescence image of the water surface in the disturbance generation process is recorded by an optical camera, and the corresponding gray value gx is extracted. The camera used may be a color camera, and the RGB channels thereof may be extracted when analyzing the color camera image, respectively, to record rx, gx, bx of three sets of data. The camera used in combination with the obtained relation F between the oil film thickness and the gray value can be a color camera, RGB channels of the color camera can be respectively extracted when the color camera image is analyzed, and three groups of data are recorded F1, F2 and F3. And analyzing the observation image to obtain the related data for detecting the spoke aggregation and radiation scattering phenomenon of the flow field. According to the linear relation F (F1, F2 and F3) of the fluorescent oil film thickness and gray scale, the corresponding oil film thickness H (three groups of estimated heights H1, H2 and H3 are obtained for the color image) is calculated by using the gray scale values in the image, so that the fluctuation condition of the radiation aggregation and radiation scattering of the fluid surface is further calculated. And finally, carrying out post-processing on the recorded gray level image to identify and observe the fluctuation change of the surface of the experimental water body. The tool used for the post-processing can be image post-processing software or a written algorithm, and the step only operates the gray data of the image, and the focus is on obtaining the characteristic of the fluctuation morphological change of the surface of the experimental water body. And thus will not be described in detail.
Under the laboratory condition, the flow field spoke aggregation and dispersion measuring method based on the oil film fluorescence brightness can adopt the device formed by the following modules for measurement. As shown in fig. 5, the specific placement positions of all the devices are not shown in fig. 5, and the device comprises an experimental water body preparation module, an image acquisition and post-processing module, an induction light source module, a fluorescent oil film preparation module and an experimental disturbance source module. The experimental water body preparation module comprises an experimental observation water tank 1 and a density layering experimental water body 2, the image acquisition and post-processing module comprises an optical camera 3, an optical filter 4, an image acquisition card and a post-processing computer 5, the induction light source module comprises an ultraviolet lamp 6 with the wavelength of 365nm, the fluorescent oil film preparation module comprises a silicone oil solution 7 of fluorescent pigment, the experimental disturbance source module comprises an underwater disturbance source 8 and mainly comprises a model and a dragging driving device, and in the embodiment, a dragging experiment is taken as an example and is used for detecting the influence of underwater dragging disturbance on radiation aggregation and radiation scattering on the surface of the experimental water body. Other disturbance modules are mainly used in specific situations.
According to the invention, the radiation aggregation and scattering phenomenon on the surface of the fluid is indirectly detected by utilizing the rule that the fluorescence signal intensity and the fluorescence oil film thickness form a linear relation, compared with the existing Particle Image Velocimetry (PIV), the method has the advantages that the fluorescent pigment with less metering is dissolved in the solvent silicone oil to generate stronger fluorescence, the phenomenon is visual and obvious, the fluctuation condition of a detected water area can be obtained by using a common optical camera, and compared with the PIV technology which needs to use a double-shutter camera with high price, the method greatly reduces the detection cost and increases the feasibility of experiments. According to the rule that the fluorescence signal intensity and the fluorescence oil film thickness are in linear relation in the Lambert-Beer law, the stronger the fluorescence signal intensity is, the thicker the fluorescence oil film is relatively. Therefore, according to the fluorescence intensity, the fluctuation condition of the fluid surface can be obtained, so that the data required to be processed in the experiment is fewer, the post-processing step is simplified, and compared with the PIV technology, the method and the device have the advantages that a large amount of complicated data are required to be processed, and the post-processing time is greatly shortened. On one hand, the method can analyze the morphology of the flow field surface wave, on the other hand, the method can directly obtain the related data of the fluctuation amplitude, and the limitation of the PIV technology in the aspect of detecting the fluctuation amplitude is solved. The optical filter is arranged on the camera to only receive the visible light of the excitation fluorescence wave band, so that the influence of the visible light of other wave bands on experimental data and experimental results in the experimental process is eliminated, the interference from the surrounding environment is smaller, the limit on the detection environment is lower, and the experimental results are more accurate. The invention is suitable for the detection experiment of the spoke-gather radiation field in a large water area, and provides a reference scheme for detecting whether an underwater or water surface navigation body passes.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (6)
1. The flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness is characterized by comprising the following steps of:
s1: respectively obtaining images of fluorescent pigment silicone oil generated by ultraviolet irradiation under at least two different known oil film thicknesses above a water body, and analyzing the images to obtain gray values corresponding to the fluorescent intensity;
the step S1 specifically includes:
s11: disposing a certain height of the silicone oil with the fluorescent pigment in a transparent vessel, and placing the transparent vessel in a container so that the horizontal symmetry line of the silicone oil in the transparent vessel is level with the surface of the water body in the container; and recording the height of the horizontal symmetry line of the silicone oil relative to the height on the container as a reference;
s12: shooting the image of fluorescence generated by the silicone oil under the irradiation of ultraviolet light through an optical camera perpendicular to the surface of the silicone oil;
s13: analyzing the gray value corresponding to fluorescence in the image; and
s14: respectively carrying out the steps S11-S13 under at least two different known oil film thicknesses to obtain corresponding different gray values under the different known oil film thicknesses;
s2: calculating to obtain an oil film thickness-gray value relation according to the known oil film thickness and the gray value; and
s3: calculating fluctuation conditions of radiation aggregation and radiation scattering of the silicone oil with the fluorescent pigment on the surface of the water body according to fluorescent images of the silicone oil and the relation between oil film thickness and gray value, which are shot under the conditions of the water body when the water body is stationary and when the water body is disturbed respectively;
the step S3 specifically includes:
s31: spreading the silicone oil with the fluorescent pigment in the transparent vessel on the surface of the water body to ensure that the surface height of the silicone oil is consistent with the reference height;
s32: irradiating the silicone oil through ultraviolet light under the condition that the water body is static and disturbed, shooting by the optical camera perpendicular to the surface of the silicone oil to obtain fluorescent images of the silicone oil under the static and disturbed conditions, and calculating gray values of the fluorescent images under the static and disturbed conditions;
s33: combining the relation of the oil film thickness and the gray value, and calculating the corresponding oil film thickness according to the gray values of the fluorescent images when the fluorescent images are static and disturbed; and
s34: and carrying out post-processing on the gray values of the fluorescent images when the fluorescent pigment is static and when the fluorescent pigment is disturbed to obtain the fluctuation condition that the silicone oil with the fluorescent pigment radiates and spreads on the surface of the water body.
2. The method for measuring the radiation and irradiance of the flow field based on the fluorescence brightness of the oil film according to claim 1, wherein the heights of the optical camera shooting in the step S32 and the step S12 are consistent, and the heights of the ultraviolet irradiation are also consistent.
3. The method for measuring the radial dispersion of flow field radiation based on the fluorescence brightness of an oil film according to claim 1, wherein when the optical camera is a color camera, RGB channel data of the color camera are respectively extracted as gray values to respectively calculate, and the oil film thickness of the silicone oil when the water body is disturbed is an average value of the oil film thickness of the silicone oil when the water body is disturbed according to the RGB channel data.
4. A flow field spoke-gather irradiance measurement method based on oil film fluorescence brightness according to any one of claims 1-3, characterized in that the oil film thickness-gray value relationship comprises a linear relationship constant.
5. A flow field spoke-gather irradiance measurement method based on oil film fluorescence brightness according to any of claims 1-3, characterized in that the concentration of the fluorescent pigment in the silicone oil with fluorescent pigment is 0.3g/L.
6. The oil film fluorescence brightness based flow field radial irradiance measurement method of any of claims 1-3, wherein the body of water comprises a saline solution having a stable density stratification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010215085.0A CN111220588B (en) | 2020-03-24 | 2020-03-24 | Flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010215085.0A CN111220588B (en) | 2020-03-24 | 2020-03-24 | Flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111220588A CN111220588A (en) | 2020-06-02 |
| CN111220588B true CN111220588B (en) | 2023-05-16 |
Family
ID=70828500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010215085.0A Active CN111220588B (en) | 2020-03-24 | 2020-03-24 | Flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111220588B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113554565B (en) * | 2021-07-27 | 2023-12-12 | 南京信息工程大学滨江学院 | Underwater image enhancement method based on lambert beer law |
| CN115170974B (en) * | 2022-09-08 | 2022-12-20 | 深圳市勘察研究院有限公司 | Method and device for intelligently detecting connectivity of karst cave based on AI (Artificial Intelligence) |
| CN115452659B (en) * | 2022-11-11 | 2023-01-17 | 北京建筑大学 | Method for evaluating diffusion capacity of asphalt activator in old asphalt by utilizing image characteristics |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10311771A (en) * | 1997-05-12 | 1998-11-24 | Toshiba Corp | Oil detecting apparatus |
| JP2004226252A (en) * | 2003-01-23 | 2004-08-12 | Toshiba Corp | Element concentration measuring instrument |
| CA2605754A1 (en) * | 2005-04-29 | 2006-11-09 | Johnson & Johnson Consumer Companies, Inc. | Topical composition fluorescence detection |
| WO2007135804A1 (en) * | 2006-05-22 | 2007-11-29 | Tokyo Institute Of Technology | Fluid measurement instrument and fluid measurement method employing laser-induced fluorescence method |
| CN101532825A (en) * | 2009-04-27 | 2009-09-16 | 天津大学 | Method for measuring thickness of sea surface spilled oil film based on differential laser triangulation method |
| CN104330387A (en) * | 2014-11-13 | 2015-02-04 | 西安电子科技大学 | Liquid-level oil contamination measurement system |
| CN106525137A (en) * | 2016-12-07 | 2017-03-22 | 天津大学 | Liquid film temperature field and flow field simultaneous measurement method based on laser induced fluorescence |
| JP2018124229A (en) * | 2017-02-03 | 2018-08-09 | 株式会社ジェイテクト | Grease for oil film thickness measurement, and device and method for measuring oil film thickness |
| CN110160452A (en) * | 2019-06-19 | 2019-08-23 | 哈尔滨工业大学（威海） | The measurement method of water-surface oil film thickness based on LR laser raman and laser fluorescence |
| WO2019239805A1 (en) * | 2018-06-14 | 2019-12-19 | 株式会社日立製作所 | Digital pcr measurement method and measurement device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004088283A2 (en) * | 2003-03-28 | 2004-10-14 | Monsanto Technology Llc | Apparatus and methods for providing sex-sorted animal sperm |
| DE102004022263A1 (en) * | 2004-05-06 | 2005-12-15 | Clondiag Chip Technologies Gmbh | Apparatus and method for detecting molecular interactions |
| JP4812393B2 (en) * | 2005-03-04 | 2011-11-09 | 株式会社日立ハイテクノロジーズ | Fluorescent molecule measurement system |
| CN101275825A (en) * | 2008-01-11 | 2008-10-01 | 浙江工业大学 | Measuring apparatus of wafer lower fluid film intermediate variable in CMP process |
| CN103336144B (en) * | 2013-05-27 | 2016-02-03 | 中国船舶重工集团公司第七○二研究所 | A kind of method of testing of water surface dead slow speed flow field |
| CN106770115B (en) * | 2016-12-26 | 2020-04-28 | 天津大学 | Method for correcting and measuring characteristic optical distortion of inner circumferential liquid film of pipeline |
| CN108225718B (en) * | 2017-12-28 | 2020-03-24 | 中国航天空气动力技术研究院 | Fluorescent oil film thickness calibration method based on temperature effect |
-
2020
- 2020-03-24 CN CN202010215085.0A patent/CN111220588B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10311771A (en) * | 1997-05-12 | 1998-11-24 | Toshiba Corp | Oil detecting apparatus |
| JP2004226252A (en) * | 2003-01-23 | 2004-08-12 | Toshiba Corp | Element concentration measuring instrument |
| CA2605754A1 (en) * | 2005-04-29 | 2006-11-09 | Johnson & Johnson Consumer Companies, Inc. | Topical composition fluorescence detection |
| WO2007135804A1 (en) * | 2006-05-22 | 2007-11-29 | Tokyo Institute Of Technology | Fluid measurement instrument and fluid measurement method employing laser-induced fluorescence method |
| CN101532825A (en) * | 2009-04-27 | 2009-09-16 | 天津大学 | Method for measuring thickness of sea surface spilled oil film based on differential laser triangulation method |
| CN104330387A (en) * | 2014-11-13 | 2015-02-04 | 西安电子科技大学 | Liquid-level oil contamination measurement system |
| CN106525137A (en) * | 2016-12-07 | 2017-03-22 | 天津大学 | Liquid film temperature field and flow field simultaneous measurement method based on laser induced fluorescence |
| JP2018124229A (en) * | 2017-02-03 | 2018-08-09 | 株式会社ジェイテクト | Grease for oil film thickness measurement, and device and method for measuring oil film thickness |
| WO2019239805A1 (en) * | 2018-06-14 | 2019-12-19 | 株式会社日立製作所 | Digital pcr measurement method and measurement device |
| CN110160452A (en) * | 2019-06-19 | 2019-08-23 | 哈尔滨工业大学（威海） | The measurement method of water-surface oil film thickness based on LR laser raman and laser fluorescence |
Non-Patent Citations (4)
| Title |
|---|
| Quantitative two-dimensional measurement of oil-film thickness by laser-induced fluorescence in a piston-ring model experiment;Wigger Stefan et al.;Applied optics;第55卷(第2期);全文 * |
| 基于紫外光诱导荧光的溢油监测方法研究;杨俊;亓洪兴;肖功海;周潘伟;;光电工程(第05期);全文 * |
| 平面激光诱导荧光技术在液膜厚度波动实验研究中的应用;臧丽叶 等;原子能科学技术;第48卷(第9期);全文 * |
| 薄层液膜厚度的点测量和空间测量方法综述;李天宇;黄冰瑶;廉天佑;李松阳;李玉阳;;实验流体力学(第01期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111220588A (en) | 2020-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111220588B (en) | Flow field spoke aggregation irradiance measurement method based on oil film fluorescence brightness | |
| US11501544B2 (en) | Deep learning-enabled portable imaging flow cytometer for label-free analysis of water samples | |
| CN107101943A (en) | A kind of optofluidic is without lens holographic imaging activity of microalgae detection means and method | |
| Tauro et al. | Tracing of shallow water flows through buoyant fluorescent particles | |
| CN107036985A (en) | A kind of transparency detection method, system and network | |
| WO2020119600A1 (en) | Image acquisition device and detection apparatus for particulate matter in liquid | |
| Fantini et al. | Drop size distribution in sprays by image processing | |
| CN112666061A (en) | Quasi-spherical cell measuring method based on light intensity model of lens-free imaging system | |
| CN113640181B (en) | Method for measuring pollutant diffusion through PLIF measurement system in wind induced flow test | |
| CN107219203B (en) | A kind of suspended particulate substance influence calibration method of seawater chlorophyll sensor measurement | |
| Hao et al. | Review on multi-parameter simultaneous measurement techniques for multiphase flow-Part B: basic physical parameters and phase characteristics | |
| Cabut et al. | PIV measurements using refraction at a solid–fluid interface | |
| Carmer et al. | Mass transport in shallow turbulent wake flow by planar concentration analysis technique | |
| ParsaMoghaddam | Rotational dynamics of rod particles in fluid flows | |
| Antonenkov | The suspension characteristics determining method with the help of images processing | |
| Christensen et al. | Experimental Determination of Bubble Size Distribution in a Water Column by Interferometric Particle Imaging and Telecentric Direct Image Method | |
| Karow et al. | Turbulent transport of discharged ground water in oceanic bottom boundary layers in a water channel experiment | |
| Papps | Merging buoyant jets in stationary and flowing ambient fluids | |
| Jehle et al. | A novel method for three-dimensional three-component analysis of flows close to free water surfaces | |
| Hilliard et al. | Measuring porous media velocity fields and grain bed architecture with a quantitative PLIF-based technique | |
| CN217359583U (en) | Multispectral multi-dimensional dark field imaging system with high signal-to-noise ratio for aquatic organisms | |
| Wang et al. | Development of a Digital Fringe Projection Technique to Characterize the Transient Behavior of Wind-Driven Droplet/Rivulet Flows | |
| Tauro et al. | Fluorescent particles for non-intrusive surface flow observations | |
| Parera Morales | Advanced image analysis techniques for laboratory experiments on soils | |
| Arnold et al. | Multi-channel laser doppler velocimetry (LDV) and digital image processing (DIP) in fluvial hydromechanics |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |