CN110987935A - Optical system for dynamic test of surface of annular liquid film - Google Patents
Optical system for dynamic test of surface of annular liquid film Download PDFInfo
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N2021/0325—Cells for testing reactions, e.g. containing reagents
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8411—Application to online plant, process monitoring
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
- G01N2021/8557—Special shaping of flow, e.g. using a by-pass line, jet flow, curtain flow
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
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Abstract
The embodiment of the invention relates to an optical system for dynamically testing the surface of an annular liquid film, which comprises: the device comprises a liquid storage module, a flow rate control module, an overflow module, a liquid film generation module, an airflow adjusting module and an imaging module; the liquid storage module is connected with the overflow module through the flow rate control module and is used for providing liquid containing the fluorescent reagent for the overflow module, and the overflow module is communicated with the liquid film generation module and is used for enabling the liquid containing the fluorescent reagent to form an annular liquid film in the liquid film generation module; the gas flow adjusting module is butted with a pipeline inlet arranged at the top end of the overflow module through a pipeline and is used for conveying gas into the liquid film generating module so as to control the flowing speed of the annular liquid film; the imaging module is arranged on the outer side of the overflow module and used for acquiring the surface dynamic characteristic of the annular liquid film. Therefore, the flowing process of the annular liquid film can be accurately reduced, and the surface structure of the liquid film can be extracted with high precision.
Description
Technical Field
The embodiment of the invention relates to the field of liquid film dynamic research, in particular to an optical system for dynamically testing the surface of an annular liquid film.
Background
The annular flow is an important gas-liquid two-phase flow pattern, and is characterized in that a gas phase flows at a high speed in the center of a pipeline to form a gas core, a liquid phase continuously flows along the pipe wall, and part of the liquid phase is carried by the gas core as liquid drops. Has a large flow velocity range of gas phase and liquid phase, and is widely applied to various industrial production processes. Especially in the aspects of heat transfer and mass transfer, the annular flow has the advantages which are incomparable with other flow patterns. The liquid film in the annular flow has low power consumption and small required flow, flows tightly attached to the pipe wall, has high heat exchange efficiency, has high application value in the links of improving the transport efficiency, implementing cooling, ensuring the safe operation of equipment or preventing the heat loss caused by the formation of the liquid film and the like, and has unique research significance in the fields of engines, steam generators, gas-liquid contactors, boiler combustion, the exploitation and transportation of petroleum and natural gas and the like.
In annular flow, the liquid film is a thin layer of continuous phase liquid flowing along the inner wall of the pipe. Since the thickness (usually in the order of hundreds of micrometers) is very thin, the flow velocity is relatively fast, especially in the actual engine spray field, there are many interference factors such as liquid droplets, bubbles, evaporation process and gas phase fuel, and there are also problems such as interference and limitation of the geometrical form of the solid surface to which the liquid film is attached, such as optical deflection of the annular liquid film, and the like, so accurately capturing the dynamic characteristics of the surface of the annular liquid film has become a very challenging research direction recognized in the industry at present.
The main methods currently applied to the measurement of the characteristic parameters of the liquid film include an acoustic method, a ray method, an electrical method and an optical method, wherein the optical method represented by laser-induced fluorescence can visually and clearly observe the surface structure of the liquid film, and meanwhile, a non-contact measuring device can avoid damaging the flowing state of the liquid, so that the measuring result is real and reliable. The current experimental device is optimized, the effective measurement visual angle is increased, the distortion caused by a circular pipeline is reduced, the measurement precision is improved, and meanwhile, the high-time (ns magnitude) space (mum magnitude) resolution multi-dimensional measurement can be conveniently realized.
Disclosure of Invention
The application provides an optical system for dynamic test of annular liquid film surface, measures liquid film surface dynamic characteristic based on laser-induced laser technique and can satisfy the test needs of liquid film space-time flow characteristic under different circumstances, is favorable to further carrying out deep research to liquid film space-time flow structure and flow mechanism in pipeline axial and circumference. .
The embodiment of the application provides an optical system for annular liquid film surface dynamic test, includes: the device comprises a liquid storage module, a flow rate control module, an overflow module, a liquid film generation module, an airflow adjusting module and an imaging module;
the liquid storage module is connected with the overflow module through the flow rate control module and is used for providing liquid containing the fluorescent reagent to the overflow module, and the overflow module is communicated with the liquid film generation module and is used for enabling the liquid containing the fluorescent reagent to form an annular liquid film in the liquid film generation module;
the gas flow adjusting module is in butt joint with a pipeline inlet arranged at the top end of the overflow module through a pipeline and is used for conveying gas into the liquid film generating module so as to control the flow speed of the annular liquid film;
the imaging module is arranged on the outer side of the overflow module and used for acquiring the surface dynamic characteristic of the annular liquid film.
In one possible embodiment, the flow rate control module includes: the liquid pump, the first ball valve and the second ball valve;
an inlet of the liquid pump is connected with the liquid storage module, an outlet of the liquid pump is connected with one end of the first ball valve, and the other end of the first ball valve is connected with the overflow module through a first connecting pipe and used for controlling the height of liquid in the overflow module;
one end of the second ball valve is connected with the liquid storage module, and the other end of the second ball valve is connected with the outlet of the liquid pump and the first ball valve.
In one possible embodiment, the overflow module comprises: the flow stabilizing device comprises a flow stabilizing device and an outer wall, wherein an accommodating cavity is arranged between the flow stabilizing device and the outer wall;
an opening matched with the first connecting pipe is formed in the outer wall of the overflow module, wherein the first connecting pipe extends to the bottom of the accommodating cavity from the opening and is used for enabling the liquid containing the fluorescent reagent to overflow from the accommodating cavity to the flow stabilizing device and enabling the liquid containing the fluorescent reagent to flow into the liquid film generating module from the flow stabilizing device.
In one possible embodiment, the flow stabilizer is provided with a plurality of through holes for restricting the flow of the liquid containing the fluorescent reagent.
In one possible embodiment, the airflow adjustment module comprises: the airflow adjustment module includes: the outlet of the high-pressure gas cylinder is connected with the liquid film generating device through the control gas circuit, and the control gas circuit is sequentially provided with a pressure reducing valve, a needle valve and a flowmeter and used for controlling the gas flow output by the high-pressure gas cylinder;
the input end of the second connecting pipe extends out of the flow stabilizing device and is connected with the outlet of the control gas circuit, and the output end of the second connecting pipe is arranged in the liquid film generation module and is used for outputting airflow to the liquid film generation module and controlling the flowing speed of the annular liquid film in the liquid film generation module through the pressure of the airflow.
In one possible embodiment, the liquid film generation module includes: a liquid film generating pipe and a drainage device;
one end of the liquid film generation pipeline is positioned in the overflow module, the drainage device is arranged in the liquid film generation pipeline and is used for enabling the liquid containing the fluorescent reagent flowing into the overflow module to form an annular liquid film, and the other end of the liquid film generation pipeline is positioned in the liquid storage tank.
In a possible embodiment, the middle part of the flow diverter is an inverted triangular pyramid, the circumferential direction of the flow diverter is provided with helical blades, and the outer side of each helical blade is provided with a barb structure for preventing the helical blades from moving along the air flow direction.
In one possible embodiment, the imaging module comprises: the device comprises a light source, a lens combination, a color filter, a camera shooting device, an adjusting device and a positioning device;
the light source is combined in a region to be detected through a lens to generate sheet light, the color filter is arranged in front of a lens of the camera device and used for filtering out stray light, the camera device is assembled on the adjusting device, and the field of view of the camera device is adjusted to the region to be detected through the adjusting device;
the adjusting device is arranged on the positioning device, and the camera shooting device is adjusted in the vertical or horizontal direction through the positioning device.
In one possible embodiment, the positioning device is disposed coaxially with the liquid film generating pipe, and the positioning device includes: horizontal guide rails and vertical guide rails.
In one possible embodiment, the adjusting means comprises: the device comprises a base, a sliding block and a limiting component;
the base passes through the slider assembly is in positioner is last, thereby pass through the slider is in positioner moves on thereby drive set up in camera device on the base, spacing subassembly set up in the base with between the positioner for control camera device's angle.
The optical system for dynamically testing the surface of the annular liquid film, provided by the embodiment of the invention, can be used for carrying out feasibility test exploration for simultaneously realizing two-dimensional space resolution and high dynamic time resolution liquid film measurement. In addition, the positioning device provided by the embodiment of the application can be suitable for liquid film flowing in pipe walls with different pipe diameters, even different shapes, is convenient for adjusting and researching the device, and enlarges the application range of the optical system in the application. In consideration of the characteristic that the surface space structure of the annular liquid film is small in practical application, the device can display the structure to be in a micron order, accurately reduce the flowing process of the annular liquid film, extract the surface structure of the liquid film with high precision and meet the dynamic test requirement of the fuel atomization process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of an optical system for dynamic testing of the surface of an annular liquid film according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an overflow module provided in an embodiment of the present application;
FIG. 3 is a schematic view of a flow diverter provided in an embodiment of the present application;
FIG. 4 is a schematic view of a positioning device for measuring a circumferential liquid film according to an embodiment of the present disclosure;
FIG. 5 is a schematic view of a positioning device for measuring an axial liquid film according to an embodiment of the present disclosure;
FIG. 6 is a bottom view of an adjustment device provided in accordance with an embodiment of the present application;
FIG. 7 is a side view of an adjustment device provided in accordance with an embodiment of the present application;
notation of the reference numerals: 1-a liquid storage tank, 2-a liquid pump, 3-a first ball valve, 4-a second ball valve, 5-a first connecting pipe, 6-an outer wall, 7-a flow stabilizer and 8-a containing cavity. 9-a high-pressure gas cylinder, 10-a pressure reducing valve, 11-a needle valve, 12-a flow meter, 13-a liquid film generating pipeline, 14-an imaging module, 15-a control gas circuit, 16-a flow diverter, 17-a gas flow pipeline, 18-a camera device, 19-an adjusting device, 20-a positioning device, 21-a horizontal guide rail, 22-a vertical guide rail, 23-a base, 24-a slide block, 25-a screw and 26-a spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, technical methods in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any creative effort, shall fall within the scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components in a certain posture, the motion situation, etc., and if the certain posture is changed, the directional indications are changed accordingly.
Fig. 1 is an optical system for dynamic testing of the surface of an annular liquid film according to an embodiment of the present application. As shown in fig. 1, the optical system includes: the device comprises a liquid storage module, a flow rate control module, an overflow module, a liquid film generation module, an airflow adjusting module and an imaging module.
The liquid storage module is connected with the overflow module through the flow rate control module and used for providing liquid containing a fluorescent reagent to the overflow module, the overflow module is communicated with the liquid film generation module and used for enabling the liquid containing the fluorescent reagent to form an annular liquid film airflow adjusting module in the liquid film generation module, and the annular liquid film airflow adjusting module is in butt joint with a pipeline inlet arranged at the top end of the overflow module through a pipeline and used for conveying gas into the liquid film generation module so as to control the flow speed of the annular liquid film; the imaging module is arranged on the outer side of the overflow module and used for acquiring the surface dynamic characteristic of the annular liquid film.
The optical system provided by the embodiment of the application considers the characteristic that the surface space structure of the annular liquid film is smaller in practical application, can display the structure to be in a micron order, accurately reduces the flowing process of the annular liquid film, and accordingly extracts the surface structure of the liquid film with high precision.
In this embodiment, the liquid storage module is a liquid storage tank 1, liquid prepared by using a fluorescent reagent is stored in the liquid storage tank, and the concentration of the fluorescent reagent is properly controlled, so that a generated fluorescent signal can be detected (signal-to-noise ratio is ensured), and the thermophysical characteristics of the liquid cannot be obviously changed under a test environment; meanwhile, attention is paid to matching of the dye and pump light, Rhondmine 6G with high efficiency is selected as the dye in the experiment, and the wavelength of the pump light is 532 nm.
In this embodiment, the flow rate control module includes: a liquid pump 2, a first ball valve 3 and a second ball valve 4; wherein, the inlet of the liquid pump 2 is connected with the liquid storage tank 1 and is used for conveying the liquid containing the fluorescent reagent in the liquid storage tank to the overflow module. The outlet of the liquid pump 2 is connected with one end of a first ball valve 3, the other end of the first ball valve 3 is connected with the overflow module through a first connecting pipe 5, and the first ball valve 3 is used for controlling the height of liquid in the overflow module. One end of the second ball valve 4 is connected to the reservoir 1, the second ball stroke being used), the liquid pump in this example uses a 350ml/min peristaltic pump.
Fig. 2 is a schematic diagram of an overflow module in an embodiment of the present application. As shown in fig. 2, the overflow module includes: the flow stabilizer 7 and the outer wall 6 are arranged, and an accommodating cavity 8 is arranged between the flow stabilizer 7 and the outer wall 6;
an opening matched with the first connecting pipe 5 is formed in the outer wall 6 of the overflow module, wherein the first connecting pipe 5 extends to the bottom of the accommodating cavity 8 from the opening, liquid containing the fluorescent reagent overflows to the flow stabilizing device 7 from the accommodating cavity 8, and flows into the liquid film generating module from the flow stabilizing device 7. The outer wall 6 of the overflow module is made of organic glass material. Wherein the first connecting pipe 5 is extended to the bottom of the containing chamber 8 to minimize sputtering and instability of the flow; the lower middle portion of the flow stabilizer 7 is uniformly distributed therethrough for restricting and stabilizing the flow. In addition, the filter screen can be adopted to filter impurities in the liquid and is fixed on the outer side wall surface of the flow stabilizer.
The airflow adjusting module in the present embodiment includes: the device comprises a high-pressure gas cylinder 9 and a control gas circuit 15, wherein the outlet of the high-pressure gas cylinder 9 is connected with a liquid film generating device through the control gas circuit 15, and a pressure reducing valve 10, a needle valve 11 and a flowmeter 12 are sequentially arranged on the control gas circuit 15 and used for controlling the gas flow output by the high-pressure gas cylinder 9. The input end of the air flow pipeline 17 extends out of the flow stabilizer 7 and is connected with the outlet of the control air path 15, the output end of the air flow pipeline 17 is arranged in the liquid film generation module and is used for outputting air flow to the liquid film generation module, and the flow speed of the annular liquid film in the liquid film generation module is controlled through the pressure of the air flow.
The liquid film generation module in this embodiment includes: a liquid film generating pipe 13 and a flow diverter 16; one end of the liquid film generating pipe 13 is positioned in the overflow module, and the other end of the liquid film generating pipe 13 is positioned in the liquid storage tank. The flow diverter 16 is arranged in the liquid film generation pipeline and used for enabling the liquid containing the fluorescent reagent flowing into the overflow module to form an annular liquid film, as shown in fig. 3, the middle part of the flow diverter 16 is an inverted triangular cone, spiral blades are arranged on the periphery of the inverted triangular cone, and the structures of the blades can be adjusted according to the actual required flow velocity and tangential velocity. The outside edge of helical blade is equipped with the barb structure that is used for preventing to remove along the air current direction, prevents to lead to the removal of drainage ware in the pipeline because the air current velocity is too big.
Wherein the material of the liquid film generating pipe 13 should be as same as the refractive index of the liquid as possible, so as to reduce the inaccuracy of the experimental result caused by the optical distortion. The liquid film generating pipelines 13 have different lengths under different experimental requirements, and overlong pipelines need to be fixed by using a support rod or a sleeve, so that the axis of the pipeline is kept vertical.
Fig. 3 is a schematic view of a positioning device for measuring a circumferential liquid film according to an embodiment of the present disclosure, as shown in fig. 3, a microscope lens with a small field of view is used to improve resolution in an embodiment of the present disclosure, and a plurality of cameras are arranged around a liquid film generation pipeline to obtain more comprehensive axial and circumferential liquid film dynamic characteristics.
The imaging module 14 in the present embodiment includes: a light source, a lens assembly, a color filter, a camera 18, a regulator 19 and a positioning device 20; the positioning device 20 is provided coaxially with the liquid film generating pipe 13, and the positioning device 20 includes: horizontal guide rails 21 and vertical guide rails 22.
The light source is a high-repetition-frequency laser, and the image pickup device is a high-speed camera. The embodiment of the application adopts a method of combining the high-repetition frequency laser and the high-speed camera, solves the problem that the dynamic characteristic of the liquid film cannot be acquired due to the over-high flow speed in the practical engineering application, realizes higher space-time resolution and has important significance for the research of the annular liquid film.
The light source is combined in the region to be measured through the lens to generate light sheets, the color filter is arranged in front of the lens of the camera device 18 and used for filtering out stray light, the camera device 18 is assembled on the adjusting device 19, and the view field of the camera device 18 is adjusted to the region to be measured through the adjusting device 19; the adjustment device 19 is provided on a horizontal rail 21, and the imaging device 18 is adjusted horizontally by the horizontal rail 21.
The imaging module 14 in the present embodiment further includes: the calibration device can be an optical experiment scale, the optical experiment scale is placed in the liquid film generation pipeline (the optical distortion of the liquid film generation pipeline is considered), experiment conditions are fully simulated, and the mm/pixel conversion coefficient under a certain determined experiment state can be obtained by measuring the optical experiment scale, so that data processing is facilitated. The resolution of the optical experimental scale used in this example was 50 μm, and it was experimentally determined that 16 pixels were one frame, i.e., the conversion factor was 3.125 μm/pixel.
Fig. 4 is a schematic diagram of a positioning device for measuring an axial liquid film according to an embodiment of the present application, and as shown in fig. 4, when performing axial measurement, an adjusting device 19 is disposed on a vertical guide rail 22, and the imaging device 18 is adjusted in a vertical direction by the vertical guide rail 22.
Fig. 5 is a bottom view of the adjusting device provided in the embodiment of the present application, and fig. 6 is a side view of the adjusting device provided in the embodiment of the present application, and in conjunction with fig. 5 and 6, the adjusting device 19 in the embodiment includes: a base 23, a slider 24 and a limiting component; the base 23 is assembled on the positioning device 20 through the sliding block 24, the sliding block 24 moves on the positioning device 20 to drive the camera device 19 arranged on the base 23, and the limiting component is arranged between the base 23 and the positioning device 20 and used for controlling the angle of the camera device 19. The camera device in this embodiment is a video camera, and the limiting component includes: a screw and a spring.
In this embodiment, there are four screws 25, and two springs 26, wherein the four screws are used in a pair.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments described above as examples. It will be appreciated by those skilled in the art that various equivalent changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended to cover all such modifications and alterations as fall within the true spirit and scope of the invention.
Claims (10)
1. An optical system for dynamic testing of the surface of an annular liquid film, comprising: the device comprises a liquid storage module, a flow rate control module, an overflow module, a liquid film generation module, an airflow adjusting module and an imaging module;
the liquid storage module is connected with the overflow module through the flow rate control module and is used for providing liquid containing the fluorescent reagent to the overflow module, and the overflow module is communicated with the liquid film generation module and is used for enabling the liquid containing the fluorescent reagent to form an annular liquid film in the liquid film generation module;
the gas flow adjusting module is in butt joint with a pipeline inlet arranged at the top end of the overflow module through a pipeline and is used for conveying gas into the liquid film generating module so as to control the flow speed of the annular liquid film;
the imaging module is arranged on the outer side of the overflow module and used for acquiring the surface dynamic characteristic of the annular liquid film.
2. The optical system of claim 1, wherein the flow rate control module comprises: the liquid pump, the first ball valve and the second ball valve;
an inlet of the liquid pump is connected with the liquid storage module, an outlet of the liquid pump is connected with one end of the first ball valve, and the other end of the first ball valve is connected with the overflow module through a first connecting pipe and used for controlling the height of liquid in the overflow module;
one end of the second ball valve is connected with the liquid storage module, and the other end of the second ball valve is connected with the outlet of the liquid pump and the first ball valve.
3. The optical system of claim 2, wherein the overflow module comprises: the flow stabilizing device comprises a flow stabilizing device and an outer wall, wherein an accommodating cavity is arranged between the flow stabilizing device and the outer wall;
an opening matched with the first connecting pipe is formed in the outer wall of the overflow module, wherein the first connecting pipe extends to the bottom of the accommodating cavity from the opening and is used for enabling the liquid containing the fluorescent reagent to overflow from the accommodating cavity to the flow stabilizing device and enabling the liquid containing the fluorescent reagent to flow into the liquid film generating module from the flow stabilizing device.
4. The optical system of claim 3, wherein the flow stabilizer is provided with a plurality of through holes for restricting the flow of the liquid containing the fluorescent agent.
5. The optical system of claim 3, wherein the airflow conditioning module comprises: the outlet of the high-pressure gas cylinder is connected with the liquid film generating device through the control gas circuit, and the control gas circuit is sequentially provided with a pressure reducing valve, a needle valve and a flowmeter and used for controlling the gas flow output by the high-pressure gas cylinder;
the input end of the second connecting pipe extends out of the flow stabilizing device and is connected with the outlet of the control gas circuit, and the output end of the second connecting pipe is arranged in the liquid film generation module and is used for outputting airflow to the liquid film generation module and controlling the flowing speed of the annular liquid film in the liquid film generation module through the pressure of the airflow.
6. The optical system of claim 5, wherein the liquid film generation module comprises: a liquid film generating pipe and a drainage device;
one end of the liquid film generation pipeline is positioned in the overflow module, the drainage device is arranged in the liquid film generation pipeline and is used for enabling the liquid containing the fluorescent reagent flowing into the overflow module to form an annular liquid film, and the other end of the liquid film generation pipeline is positioned in the liquid storage tank.
7. The optical system according to claim 6, wherein the middle part of the flow diverter is an inverted triangular pyramid, the periphery of the flow diverter is provided with helical blades, and the outer sides of the helical blades are provided with barb structures for preventing the helical blades from moving along the airflow direction.
8. The optical system of claim 6, wherein the imaging module comprises: the device comprises a light source, a lens assembly, a color filter, a camera shooting device, an adjusting device and a positioning device;
the light source is spread into a piece of light in a region to be measured through a lens assembly, the color filter is arranged in front of a lens of the camera device and used for filtering out stray light, the camera device is assembled on the adjusting device, and the field of view of the camera device is adjusted to the region to be measured through the adjusting device;
the adjusting device is arranged on the positioning device, and the camera shooting device is adjusted in the vertical or horizontal direction through the positioning device.
The image pickup device comprises a telecentric lens, a lens adapter ring and an ICCD camera, and because the image in the tube is shot, the parallax of the traditional lens can be corrected by using the telecentric lens, so that the image magnification ratio can not change along with the change of the object distance in a certain object distance range.
9. The optical system according to claim 8, wherein the positioning device is disposed coaxially with the liquid film generating conduit, and the positioning device comprises: horizontal guide rails and vertical guide rails.
10. The optical system of claim 8, wherein the adjustment device comprises: the device comprises a base, a sliding block and a limiting component;
the base passes through the slider assembly is in positioner is last, thereby pass through the slider is in positioner moves on thereby drive set up in camera device on the base, spacing subassembly set up in the base with between the positioner for control camera device's angle.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111504172A (en) * | 2020-04-28 | 2020-08-07 | 天津大学 | Calibration device for thin liquid film sensor of conductive ring |
| CN111504171A (en) * | 2020-04-28 | 2020-08-07 | 天津大学 | Equivalent calibration method for conductive ring thin liquid film sensor |
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| CN111504172A (en) * | 2020-04-28 | 2020-08-07 | 天津大学 | Calibration device for thin liquid film sensor of conductive ring |
| CN111504171A (en) * | 2020-04-28 | 2020-08-07 | 天津大学 | Equivalent calibration method for conductive ring thin liquid film sensor |
| CN111504171B (en) * | 2020-04-28 | 2021-04-27 | 天津大学 | Equivalent calibration method for conductive ring thin liquid film sensor |
| CN111504172B (en) * | 2020-04-28 | 2021-04-27 | 天津大学 | Calibration device for thin liquid film sensor of conductive ring |
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