Schlieren imaging system

Abstract

The utility model discloses a schlieren imaging system, which belongs to the technical field of imaging and comprises an exhibition stand, and a camera, a blade, a coaxial light source and a concave mirror which are positioned on the same axis are arranged on the upper end surface of the exhibition stand; the device is characterized in that an airflow fluid changing device is arranged between the coaxial light source and the concave mirror, and the airflow fluid changing device comprises a fan and a fan blade assembly which are arranged on the two sides of the axis; the fan blade assembly is composed of a plurality of fan blades with different blade numbers, and the positions, opposite to the draught fan, of the fan blades are changed through a fan blade switching device. The beneficial effects of the utility model are that the position relative to the fan is changed through the fan blade switching device, so that the fan blades with different blade numbers are matched with the fan to generate the change of gas fluid, and the changed gas fluid is displayed to audiences in a dynamic imaging picture by means of the schlieren imaging principle; and audiences can conveniently understand the schlieren imaging principle through vivid imaging pictures.

Description

Technical Field:

[0001] The utility model belongs to the field of imaging technology, and more specifically relates to a schlieren imaging system. Background Art:

[0002] The schlieren system is an optical experimental technique used for visualizing and quantitatively analyzing density gradient changes in a transparent medium. It is based on the refraction phenomenon, and by observing the deflection of light in a medium with density gradient changes, the density changes in the medium are displayed.

[0003] The national utility model patent with the patent number 202322000948.4 discloses a schlieren imaging system, which includes the following key components: Light source: provides a parallel light beam, usually using a point light source or a parallel light source; Lens: used to convert the divergent light beam of the light source into a parallel light beam, so that the light remains almost parallel when propagating in the medium; Knife edge: a slit or blade located on the observation plane, used to shield the directly passing light and only allow the deflected light to pass through; Observation device: includes a projection screen or a camera device, used to record and observe the formed schlieren image or video.

[0004] Through the schlieren system, the density gradient changes in the medium can be observed, and these changes will be displayed as brightness or color changes in the schlieren image. This enables researchers to visualize and analyze phenomena such as fluid flow, heat conduction, and sound wave propagation, thereby providing information about the density distribution and flow characteristics in the medium.

[0005] Currently, for the light source mentioned in the above patent: provides a parallel light beam, usually using a point light source or a parallel light source; Lens: used to convert the divergent light beam of the light source into a parallel light beam, so that the light remains almost parallel when propagating in the medium; there are finished products sold on the market, which are coaxial light sources and have the functions of the above light source and lens.

[0006] However, currently there is no popular science device that can achieve density gradient changes in the medium through simple operations, and it is impossible to use the schlieren system, where these changes will be displayed as brightness or color changes in the schlieren image, to meet the needs of children's understanding of schlieren imaging. Content of the Utility Model:

[0007] To solve the above problems and overcome the deficiencies of the prior art, the utility model provides a schlieren imaging system;

[0008] The first technical problem to be solved is: Currently, there is no popular science device that can achieve density gradient changes in the medium through simple operations, and it is impossible to use the schlieren system, where these changes will be displayed as brightness or color changes in the schlieren image, to meet the needs of children's understanding of schlieren imaging.

[0009] The specific technical solution of the present utility model to solve the above technical problems is as follows: The schlieren imaging system includes a booth, and a camera, a blade, a coaxial light source, and a concave mirror located on the same axis are arranged on the upper end surface of the booth; it is characterized in that:

[0010] An air flow fluid change device is arranged between the coaxial light source and the concave mirror,

[0011] The air flow fluid change device includes a fan and a fan blade assembly arranged on both sides of the axis;

[0012] The fan blade assembly is composed of a plurality of fan blades with different numbers of blades, and the fan blades change their positions relative to the fan through a fan blade switching device.

[0013] Further, the camera and the coaxial light source are located on the optical axis of the concave mirror.

[0014] Further, the fan blade switching device includes a turntable and a handwheel. The turntable is rotatably connected to the booth through a rotating shaft, and a pulley I is arranged at the end of the rotating shaft. The handwheel is rotatably connected to the booth through a rotating shaft, and a pulley II is arranged at the end of the rotating shaft.

[0015] Further, the pulley I and the pulley II are connected by a belt.

[0016] Further, a preset number of fan blades are arranged on the upper end surface of the turntable in an annular matrix, and the numbers of blades of the fan blades are different.

[0017] Further, the fan blade is connected to the output shaft of the motor through a central shaft key.

[0018] Further, the motor is fixed on the upper end surface of the turntable through a motor base.

[0019] The beneficial effects of the present utility model are as follows:

[0020] One advantage of the present utility model is to provide an air flow fluid change device, which changes the position relative to the fan through the fan blade switching device, thereby realizing the change of the gas fluid generated by the fan blades with different numbers of blades in cooperation with the fan, and presenting the changed gas fluid to the audience in a dynamic imaging picture by means of the schlieren imaging principle, which is convenient for the audience to understand the schlieren imaging principle through the vivid imaging picture;

[0021] One advantage of the present utility model is to provide a fan blade switching device, which can interact with the audience. The audience can observe the dynamic imaging picture of the changing gas fluid by simply turning the handwheel. Description of the drawings:

[0022] Att Figure 1 is a schematic structural diagram of the present utility model;

[0023] AttFigure 2 This is a schematic diagram of the upward view structure of the present utility model; in the drawings:

[0024] 1. Camera; 2. Coaxial light source; 3. Exhibition stand; 4. Handwheel; 5. Fan; 6. Concave mirror; 7. Fan blade; 8. Motor base; 9. Turntable; 10. Pulley I; 11. Pulley II. Specific implementation manner:

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "rear", "lower left", "upper right", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] Specific implementation manner of the present utility model: The schlieren imaging system described includes an exhibition stand 3, and a camera 1, a blade, a coaxial light source 2 and a concave mirror 6 located on the same axis are arranged on the upper end surface of the exhibition stand 3; its characteristics are:

[0027] An airflow fluid change device is arranged between the coaxial light source 2 and the concave mirror 6,

[0028] The airflow fluid change device includes a fan 5 and a fan blade assembly arranged on both sides of the axis;

[0029] The fan blade assembly is composed of a plurality of fan blades 7 with different numbers of blades, and the fan blades 7 change their positions relative to the fan 5 through a fan blade switching device.

[0030] Furthermore, the camera 1 and the coaxial light source 2 are located on the optical axis of the concave mirror 6.

[0031] Furthermore, the fan blade switching device includes a turntable 9 and a handwheel 4. The turntable 9 is rotatably connected to the exhibition stand 3 through a rotating shaft, and a pulley I 10 is arranged at the end of the rotating shaft. The handwheel 4 is rotatably connected to the exhibition stand 3 through a rotating shaft, and a pulley II 11 is arranged at the end of the rotating shaft.

[0032] Furthermore, the pulley I 10 and the pulley II 11 are connected by a belt.

[0033] Furthermore, a preset number of fan blades are arranged on the upper end surface of the turntable 9 in a circular matrix, and the numbers of blades of the fan blades are different.

[0034] Furthermore, the fan blade is connected to the output shaft of the motor through a central shaft key.

[0035] Furthermore, the motor is fixed to the upper end surface of the turntable 9 through a motor base 8.

[0036] It should be noted that the present utility model is a schlieren imaging system. When it works specifically,

[0037] 1. The applicant purchased the coaxial light source 2 in the form of procurement, which can have the functions of a beam splitter and a light source in the prior art. The schlieren imaging principle is also the same as that of the national utility model patent of the comparative document 202322000948.4, which discloses a schlieren imaging system.

[0038] The difference is that an airflow fluid change device is provided between the coaxial light source 2 and the concave mirror 6, and the working principle is as follows:

[0039] The viewer manually rotates the handwheel 4, and the handwheel 4 drives the pulley II 11 to rotate. The pulley II 11 drives the rotation of the pulley I 10 and the turntable 9 through a belt, thereby changing the fan blade 7 whose relative position to the fan 5, and switching the fan blade 7 to a fan blade 7 with different numbers of blades; under the blowing of the fan 5, the fan blades 7 with different numbers of blades will generate different fluid flows, and this fluid flow is visualized by the schlieren imaging principle into a fluid flow invisible to the human eye.

[0040] 2. Specifically: The light refracted by the coaxial light source 2 passes through the flowing fluid between the fan 5 and the fan blade 7 with different numbers of blades, and is reflected back to the beam splitter of the coaxial light source 2 through the concave mirror 6. The light penetrates the beam splitter and is focused to generate a light spot, which is gathered on the knife edge in front of the camera 1. The knife edge blocks a part of the camera 1, and then the camera 1 receives and forms an image. The thin and sharp knife edge cuts off half of the reflected light, and the edge blocks some refracted light, thereby generating an image with good contrast.

[0041] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A schlieren imaging system, comprising a booth (3), on the upper end surface of the booth (3), there are arranged a camera (1), a blade, a coaxial light source (2) and a concave mirror (6) located on the same axis; characterized in that: An air flow fluid change device is arranged between the coaxial light source (2) and the concave mirror (6), The air flow fluid change device comprises a fan (5) and a fan blade assembly arranged on both sides of the axis; The fan blade assembly is composed of a plurality of fan blades (7) with different numbers of blades, and the fan blades (7) change the position relative to the fan (5) through a fan blade switching device.

2. The schlieren imaging system according to claim 1, characterized in that The camera (1) and the coaxial light source (2) are located on the optical axis of the concave mirror (6).

3. The schlieren imaging system according to claim 1, wherein The fan blade switching device comprises a turntable (9) and a handwheel (4), the turntable (9) is rotationally connected to the booth (3) through a rotating shaft, a pulley I (10) is arranged at the end of the rotating shaft, the handwheel (4) is rotationally connected to the booth (3) through a rotating shaft, and a pulley II (11) is arranged at the end of the rotating shaft.

4. The schlieren imaging system according to claim 3, characterized in that The pulley I (10) and the pulley II (11) are connected by a belt.

5. The schlieren imaging system according to claim 3, characterized in that On the upper end surface of the turntable (9), a preset number of fan blades are arranged in an annular matrix, and the numbers of blades of the fan blades are different.

6. The schlieren imaging system according to claim 5, wherein The fan blade is connected to the output shaft of the motor through a central axis key.

7. The schlieren imaging system according to claim 6, characterized in that The motor is fixed on the upper end surface of the turntable (9) through a motor base (8).

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