KR100973830B1 - Particle Image Fluid Velocity Measuring Device for Multiple Plane - Google Patents

Abstract

The present invention relates to a multi-plane particle image flow rate measuring apparatus for observing a large area flow area and obtaining a flow field.

The multi-plane particle image flow rate measuring apparatus of the present invention includes a plurality of cameras each obtaining a multi-plane image in a target flow region to be observed, a horizontal guide for mounting the camera to adjust a horizontal position of the camera, and the It includes a vertical guide for mounting a horizontal guide to adjust the vertical position of the horizontal guide.

Large Area, Particle Image Velocity, Multiple, Planar, Optical Distortion

Description

Particle Image Fluid Velocity Measuring Device for Multiple Plane

The present invention relates to a multi-plane particle image velocity measurement apparatus, and more particularly, to a multi-plane particle image velocity measurement apparatus for reducing distortion of flow information in a velocity field for acquiring large-area flow information. It is about.

In general, an image acquired by a camera generates optical distortion in the outer portion of the measurement area regardless of size. The optical distortion phenomenon distorts the physical coordinates and generates an error in the particle image velocity measuring device which observes the instantaneous velocity field from the coordinate information of the particle position.

The particle image velocity measurement apparatus may use a standard lens to reduce optical distortion, and in this case, even if some optical distortion occurs, it has high reliability with respect to the result of the velocity field. It is limited in the range of.

In order to obtain the flow information on the large-area flow area, a large-area flow area observation method includes a method of observing the flow area to be observed by applying a zoom lens or a wide-angle lens with one image, and the flow to be observed. There is a method of dividing an area into a plurality of small measurement sections and observing each flow area, and obtaining one velocity field from the image information of the velocity fields of each measurement section through a mathematical post-processing process.

In the method of observing the flow region using the wide-angle lens, by controlling the focal length together with the wide-angle lens, the fluid flow inside the large-area flow region can be acquired by one image information, that is, one camera.

The method of observing the flow region using the wide-angle lens makes it difficult to distinguish several micrometer particles moving along the fluid from the image, and as the focal length increases, the image area is accurately represented as the image size increases, but the edge of the image is accurately represented. In the region, distortion occurs.

If the distortion is severe, the coordinates are corrected through the correction process, and even after the correction process, the edge region of the image has low reliability.

A method of observing a flow region by dividing into a plurality of measurement cross sections may use a particle image velocity measuring device.

For example, the particle image velocity measurement device is designed to observe the flow characteristics of the interior of the car's heating ventilation air conditioning system (HVAC) module in an area of approximately 32 × 32 cm without optical distortion in detail. The flow zone can be divided into five.

In order to remove the optical distortion phenomenon in the edge region of the image, the particle image velocity measuring apparatus divides the entire flow region into smaller measurement cross sections of 15 × 15 cm, acquires a particle image from each measurement cross section and post-processes it. Through the process, velocity fields can be obtained, and these can be merged into one to represent the flow information of the entire flow domain.

In this case, the particle image velocity measurement apparatus, each measurement cross-section overlaps the adjacent measurement cross-section about 5-10mm to obtain the flow information, in order to obtain the flow information of the entire flow area, accurate information about the coordinates of each particle image Should be.

As described above, the particle image velocity measuring device may accumulate in several stages a minute error that may occur in the process of expressing the velocity field information of one large flow region from the particle images acquired in the plurality of measurement cross-sections. May cause

Since the particle image velocity measurement apparatus measures the plurality of measurement cross sections instantaneously and does not observe the flow field at the same time zone, the particle image flow rate measurement device cannot acquire the particle image and flow information at the same time zone.

For example, the time required to measure the velocity field of the first measurement cross section is at least 10 minutes when acquiring 200 instantaneous velocity fields and moves the particle imaging device to the second measurement cross section. Takes tens of minutes.

In addition to the time required for the movement, additional time may be required for the focal length adjustment and the basic test for proper particle image acquisition. Through this process, the experiment from the first measurement cross section to the last measurement cross section may take several hours to several days (for example, 2-3 days).

Particle image flow rate device, the temperature, humidity, air density, ambient pressure and experimental environment can be changed during the experiment, it is not possible to obtain the flow information of the exact same time zone.

In addition, the particle image velocity device may greatly generate an error of the particle image and the flow information in a portion where the coordinates do not coincide when the coordinates of the connected areas are not exactly matched in the process of mathematically combining the respective measurement cross-sections.

One embodiment of the present invention relates to a multi-plane particle image flow rate measuring apparatus for observing a large area flow area and obtaining a flow field.

An embodiment of the present invention relates to a multi-plane particle image velocity measurement apparatus for reducing distortion of flow information in a velocity field in order to accurately obtain large area flow information.

Multi-plane particle image flow rate measuring apparatus according to an embodiment of the present invention, a plurality of cameras each obtained a multi-plane image in the target flow region to be observed, by mounting the camera to adjust the horizontal position of the camera It may include a horizontal guide, and a vertical guide for mounting the horizontal guide to adjust the vertical position of the horizontal guide.

The horizontal guide may mount at least two cameras. The vertical guide may mount at least two horizontal guides.

The vertical guide may include a vertical member disposed in a vertical direction on the base, a protrusion formed in the horizontal guide to be coupled to the groove of the vertical member to move up and down in the vertical direction, and disposed in parallel with the vertical member. It may include a vertical lead screw screwed.

The vertical lead screw may be screwed with the clamp mounted to the horizontal guide.

The vertical member includes a first vertical member and a second vertical member disposed in pairs, the first vertical member and the second vertical member are connected to each other by a connecting member, and the vertical lead screw is connected to the connecting member. It can be rotatably mounted.

The horizontal guide may include a horizontal member disposed in a horizontal direction with respect to a base, a protrusion formed in the camera to be coupled to a groove of the horizontal member to move in a horizontal direction, and disposed parallel to the horizontal member and screwed to the camera. And, it may include a horizontal lead screw rotatably mounted to the horizontal member.

The horizontal lead screw may be screwed into a hole formed in the camera.

The horizontal lead screw may include a left screw portion formed on one side and a right screw portion formed on the other side.

The horizontal member may include a first horizontal member and a second horizontal member disposed in pairs, and the vertical guide may include a vertical member disposed in a vertical direction and a vertical lead screw disposed in parallel with the vertical member. The first horizontal member and the second horizontal member may be connected to each other by the vertical lead screw.

The vertical lead screw may include a left screw portion formed on one side and a right screw portion formed on the other side.

The plurality of cameras may partially overlap neighboring measurement areas when acquiring multiple segmented images.

The plurality of cameras may form one of 2 × 2, 3 × 3, and 4 × 4.

As described above, according to an exemplary embodiment of the present invention, since the vertical guide adjusts the vertical position of the horizontal guide and the horizontal guide adjusts the horizontal position of the plurality of cameras, the flow area of the large area with the plurality of cameras mounted on the horizontal guide. It is effective in observing the multi split plane and obtaining the flow field.

Particle images of the same time zone are acquired at each measurement section with multiple division planes, so that flow information can be accurately obtained at a large area.

In other words, by acquiring particle images in the same period, it is possible to prevent measurement errors that may occur in the post-processing process, to improve reliability in the mathematical processing process of the obtained instantaneous velocity field, and to shorten the time for obtaining accurate flow information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a perspective view of a multi-plane particle image velocity measurement apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a multi-plane particle image velocity measuring apparatus according to an exemplary embodiment includes a plurality of Charged Coupled Device (CCD) cameras or a Complementary Metal (CMOS) camera to prevent distortion in a particle image acquired for a large area flow area. Oxide Semiconductor) cameras are arranged and configured to observe the entire flow field simultaneously using the synchronized input signals.

In the multi-plane particle image velocity measurement apparatus, a device for irradiating a laser to a target flow region, a device for controlling the flow of the target flow region, a synchronous device for providing a synchronization signal to a plurality of cameras, and a controller for controlling them are well known. Since the techniques can be applied, a detailed description thereof will be omitted.

The multi-plane particle image flow rate measuring device according to the present embodiment includes a plurality of cameras 10 arranged to be able to observe the multi-division planes of the target flow region, and the positions of the cameras 10 in the horizontal direction. Or a horizontal guide 20 and a vertical guide 30 formed to adjust in a vertical direction.

The plurality of cameras 10 acquires images of multiple planes in the target flow region to be observed. For example, the cameras 10 may be formed as CCD cameras or CMOS cameras.

The horizontal guide 20 is formed to mount the cameras 10 so as to adjust the horizontal position of the cameras 10. For example, the horizontal guide 20 mounts two cameras 10 to adjust the horizontal position of each camera 10.

The vertical guide 30 is formed to mount the horizontal guide 20 to adjust the vertical position of the horizontal guide 20. For example, the vertical guide 30 mounts two horizontal guides 20 to adjust the vertical position of each horizontal guide 20.

That is, the multi-plane particle image flow rate measuring device adjusts the vertical position of the horizontal guide 20 by the operation of the vertical guide 30, thereby adjusting the vertical position of the camera 10, and by operating the horizontal guide 20. Since the horizontal position of 10 is adjusted, a plurality of cameras 10 can be used to observe the target flow region in multiple planes.

FIG. 2 is an exploded perspective view of the vertical guide and the horizontal guide of FIG. 1, and FIG. 3 is an exploded perspective view of the vertical guide of FIG.

2 and 3, the vertical guide 30 includes a vertical member 31 installed in the base 40, a groove 32 of the vertical member 31, a protrusion 33 of the horizontal guide 20, and A vertical lead screw 34.

The vertical member 31 is installed in a state perpendicular to the base 40. For example, the vertical member 31 includes a first vertical member 311, a second vertical member 312 and a connection member 313 installed in pairs. The vertical member 31 may be formed as one (not shown).

The connection member 313 connects the first vertical member 311 and the second vertical member 312 to each other. That is, the first vertical member 311 and the second vertical member 312 are connected to the base 40 at the lower end and connected to the connection member 313 at the upper end. Therefore, the vertical member 31 and the multi-plane particle image velocity measurement apparatus of this embodiment are structurally robust.

Referring to FIG. 2, in the vertical guide 30, the groove 32 is elongated along a vertical direction on one side of the vertical member 31 to guide the lifting and lowering of the horizontal guide 20 having the protrusion 33. . The protrusion 33 is formed at one side of the horizontal guide 20 to be coupled to the groove 32.

Referring to FIG. 3, the vertical lead screw 34 is disposed in parallel with the vertical member 31 or the first vertical member 311 and the second vertical member 312, and is screwed to the horizontal guide 20. .

The vertical lead screw 34 is installed vertically with respect to the base 40, and the horizontal guide 20 can be elevated in the vertical direction according to the rotational drive. For example, the vertical lead screw 34 is screwed with the clamp 21a mounted to the horizontal guide 20 and rotatably mounted to the connecting member 313.

For example, the vertical lead screw 34 forms a groove 341 at the top thereof, and a clamp 323a is mounted on the connection member 313 corresponding to the groove 341. Since the clamp 323a rotatably supports the groove 341, the vertical lease screw 34 can rotate in position on the connecting member 313.

When the handle 342 provided on the vertical lead screw 34 is rotated, the vertical lead screw 34 moves up and down in the vertical direction while the screwed horizontal member 21 rotates in the connecting member 313 and the clamp 323a. Let's do it.

Meanwhile, the horizontal guide 20 includes a horizontal member 21, a groove 22 of the horizontal member 21, a protrusion 23 of the camera 10, and a horizontal lead screw 24.

The horizontal member 21 is installed on the vertical member 31 in a horizontal state with respect to the base 40. For example, the horizontal member 21 includes a first horizontal member 211 and a second horizontal member 212 installed in pairs. The horizontal member 31 may be installed in two, three or four or more (not shown)

Referring to FIG. 2, in the horizontal guide 20, the groove 22 is formed long along the horizontal direction on one side of the horizontal member 21 to guide the horizontal movement of the camera 10 having the protrusion 23. . The protrusion 23 is formed at one side of the camera 10 to be coupled to the groove 22.

Referring to FIG. 3, the horizontal lead screw 24 is disposed in parallel with the horizontal member 21 or the first horizontal member 211 and the second horizontal member 212, and is screwed to the camera 10. It is rotatably mounted on the horizontal member (21).

The horizontal lead screw 24 is screwed into the hole 10a formed in the camera 10 to move the camera 10 in the horizontal direction according to the rotational drive.

For example, the horizontal lead screw 24 forms grooves 241 at both ends, and the clamp 223a is mounted on the horizontal member 21 corresponding to the grooves 241. Since the clamp 223a rotatably supports the groove 241, the horizontal lead screw 24 may rotate in place on the horizontal member 21.

When the handle 242 provided in the horizontal lead screw 24 is rotated, the horizontal lead screw 24 moves the screwed camera 10 in the horizontal direction while rotating the horizontal member 21 and the clamp 223a. .

FIG. 4 is an operational state diagram of the vertical guide of FIG. 1, and FIG. 5 is an operational state diagram of the horizontal guide of FIG.

Meanwhile, the plurality of cameras 10 may form one of 2 × 2, 3 × 3, and 4 × 4 arrays. The plurality of cameras 10 are arranged by partially overlapping neighboring measurement areas, when acquiring multiple segmented images.

For convenience, FIGS. 4 and 5 illustrate a 2 × 2 arrangement of Chemera 10. Referring to this, the first camera 11 and the second camera 12 mounted on the first horizontal member 211 overlap each other in the horizontal direction, and the third camera mounted on the second horizontal member 212. The camera 13 and the fourth camera 14 overlap each other in the horizontal direction.

The first and second cameras 11 and 12 mounted on the first horizontal member 211 and the third and fourth cameras 13 and 14 mounted on the second horizontal member 212 are perpendicular to each other. Are each nested.

Accordingly, the first to fourth cameras 11, 12, 13, and 14 form overlapping regions with each other in the vertical direction and the horizontal direction in the entire measurement target flow region.

The horizontal lead screw 24 moves the first and second cameras 11 and 12 in the first horizontal member 211 and the third and fourth cameras 13 and 14 in the second horizontal member 212 in the horizontal direction. To move away from each other or close to each other.

To this end, the horizontal lead screw 24 includes a left threaded portion S241 and a right threaded portion S242 which are formed bisected at both sides from the center in the longitudinal direction (horizontal direction) (see FIG. 5).

Since the same is implemented on the first and second horizontal members 211 and 212, for example, when the handle 242 is rotated clockwise on the first horizontal member 211 (solid line), the horizontal lead screw 24 ) Moves the first camera 11 and the second camera 12 away from each other while rotating clockwise (solid line). At this time, the first camera 11 and the second camera 12 are moved with each other by the same distance on the horizontal lead screw 24.

When the handle 242 is rotated counterclockwise (hidden line shown), the horizontal lead screw 24 rotates counterclockwise (hidden line shown), bringing the first camera 11 and the second camera 12 closer to each other. Move it. At this time, the first camera 11 and the second camera 12 are moved with each other by the same distance on the horizontal lead screw 24.

Referring to FIG. 4, the vertical lead screw 34 raises and lowers the first horizontal member 211 and the second horizontal member 212 in the vertical direction, and thus the first horizontal member 211 and the second horizontal member 212. Are moved away from or near each other in the vertical direction.

For this purpose, the vertical lead screw 34 includes a left threaded portion S341 and a right threaded portion S342, which are formed bisected in both directions at the center in the longitudinal direction (vertical direction) (see Fig. 4).

When the handle 342 is rotated clockwise on the vertical member 31 (solid line), the vertical lead screw 34 rotates clockwise (solid line), while the first horizontal subsidiary 211 and the second horizontal member are rotated. Move 212 away from each other.

That is, the first and second cameras 11 and 12 and the third and fourth cameras 13 and 14 move away from each other. In this case, the first horizontal member 211, the first and second cameras 11 and 12, and the second horizontal member 212, the third and fourth cameras 13 and 14 are the same on the vertical lead screw 34. Move each other by distance.

On the vertical member 31, when the handle 342 is rotated counterclockwise (hidden line), the vertical lead screw 34 is rotated counterclockwise (hidden line), while the first horizontal subsidiary 211 2 horizontal member 212 is moved closer to each other.

That is, the first and second cameras 11 and 12 and the third and fourth cameras 13 and 14 are close to each other. In this case, the first horizontal member 211, the first and second cameras 11 and 12, and the second horizontal member 212, the third and fourth cameras 13 and 14 are the same on the vertical lead screw 34. Move each other by distance.

By operation of the first and second horizontal lead screws 211 and 212 and the vertical lead screw 34, the first to fourth cameras 11, 12, 13, and 14 are divided into four divided regions A1 and A2 at the same time. Observe the flow fields of A3 and A4).

Therefore, measurement errors that may occur in the post-processing process are prevented, reliability is improved during the mathematical processing of the instantaneous velocity field, and time for acquiring the total flow field information is shortened.

Neighboring parts of the divided areas A1, A2, A3, and A4 overlap each other by about 5 to 10 mm to take a particle image, and measure measurement errors that may occur at the connecting parts of the divided areas A1, A2, A3, and A4. Reduce

 When the first to fourth cameras 11, 12, 13, and 14 acquire the particle image, the laser plane light has the same intensity of the scattered light of the particles in the flow region to be observed. The error caused by the difference in the illumination intensity irradiated to can be reduced.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a perspective view of a multi-plane particle image velocity measurement apparatus according to an embodiment of the present invention.

2 is an exploded perspective view of the vertical guide and the horizontal guide of FIG.

3 is an exploded perspective view of the vertical guide of FIG.

4 is an operational state diagram of the vertical guide of FIG.

5 is an operational state diagram of the horizontal guide of FIG.

<Explanation of symbols for the main parts of the drawings>

10: camera 11, 12: first and second camera

13, 14: 3rd, 4th camera 10a: Hall

20: horizontal guide 21: horizontal member

211 and 212: first and second horizontal members 21a, 223a and 323a: clamps

22, 32, 241, 341: groove 23, 33: protrusion

24: horizontal lead screw 242, 342: handle

S241, S341: Left hand thread S242, S342: Right hand thread

30: vertical guide 31: vertical member

311, 312: first and second vertical members 313: connecting member

34: vertical lead screw 40: base

Claims (13)

A plurality of cameras each obtaining a multi-plane image in a target flow region to be observed; A horizontal guide for mounting the camera to adjust a horizontal position of the camera; And It includes a vertical guide for mounting the horizontal guide to adjust the vertical position of the horizontal guide, The vertical guide, Vertical member disposed in the vertical direction on the base, A protrusion formed on the horizontal guide to be coupled to the groove of the vertical member to move in a vertical direction; and And a vertical lead screw disposed in parallel with the vertical member and screwed to the horizontal guide. According to claim 1, The horizontal guide is a multi-plane particle image flow rate measuring device for mounting at least two cameras. The method of claim 2, The vertical guide is a multi-plane particle image flow rate measuring device for mounting at least two of the horizontal guide. delete According to claim 1, The vertical lead screw is a multi-plane particle image flow rate measuring device that is screwed with the clamp mounted to the horizontal guide. According to claim 1, The vertical member includes a first vertical member and a second vertical member disposed in pairs, The first vertical member and the second vertical member are connected to each other by a connecting member, And the vertical lead screw is rotatably mounted to the connection member. A plurality of cameras each obtaining a multi-plane image in a target flow region to be observed; A horizontal guide for mounting the camera to adjust a horizontal position of the camera; And It includes a vertical guide for mounting the horizontal guide to adjust the vertical position of the horizontal guide, The horizontal guide, A horizontal member disposed in a horizontal direction with respect to the base, A protrusion formed in the camera to be coupled to a groove of the horizontal member and to move in a horizontal direction; And a horizontal lead screw disposed in parallel with the horizontal member and screwed to the camera and rotatably mounted to the horizontal member. The method of claim 7, wherein The horizontal lead screw is a multi-plane particle image flow rate measuring device that is screwed into the hole formed in the camera. The method of claim 8, The horizontal lead screw is a multi-plane particle image flow rate measuring apparatus including a left screw portion formed on one side and a right screw portion formed on the other side. The method of claim 7, wherein The horizontal member, A first horizontal member and a second horizontal member disposed in pairs, The vertical guide, Vertical member disposed in the vertical direction It includes a vertical lead screw disposed in parallel with the vertical member, And the first horizontal member and the second horizontal member are connected to each other by the vertical lead screw. The method of claim 10, The vertical lead screw is a multi-plane particle image flow rate measuring apparatus including a left screw portion formed on one side and a right screw portion formed on the other side. According to claim 1, The plurality of cameras, the multi-plane particle image flow rate measuring device partially overlaps the adjacent measurement area when obtaining a multi-segment image. According to claim 1, The plurality of cameras is a multi-plane particle image flow rate measuring device of the arrangement of one of 2 × 2, 3 × 3 and 4 × 4.

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