KR20040036827A - automatic measurement system of multi-angular scanning for tomographic resconstruction - Google Patents

Abstract

PURPOSE: Provided is a device for multi-angular scanning measurement for automatically transferring a sprayer in a laser diffraction particle analyzer, by which information at a local point can be obtained simply and precisely. CONSTITUTION: The multi-angular scanning measuring device adapted to a particle diameter measuring device comprises: a control unit(20); a porous sprayer; a rotation unit which is controlled by the control unit(20) to control the rotation angle of the porous sprayer; and a horizontal transfer unit which is controlled by the control unit(20) to control the horizontal moving distance. Particularly, the porous sprayer has an adaptor(4), and the rotation unit comprises a first motor(2), a first gear(3) rotated by the first motor(2), and a second gear(5) engaged with the first gear(3) and attached to the adaptor(4).

Description

Automatic measurement system of multi-angular scanning for tomographic resconstruction

The present invention relates to a device for detecting a spray structure, and more particularly, to a polygonal scanning device required when grasping an asymmetric spray structure.

Spraying is used in a wide range of fields such as power generation devices such as internal combustion engines and gas turbines, heat generating devices such as industrial furnaces, spray drying, spray cooling, manufacturing of metal powders and process industries such as spray painting. In order to achieve high combustion efficiency, it is important to know spray structure such as dispersion length, spray angle and penetration distance of atomized liquid, atomization characteristics and spatial distribution of droplets. It is important to know the spray structure in determining the coagulation rate.

Since spatial information at any point is important for grasping the spray structure, it is necessary to convert path integral data measured by a particle diameter analyzer (hereinafter referred to as "LPDA") into local point information. In the case of axial symmetry, it is possible to scan the measurement section once and obtain local point information through Abel transformation, thus reducing measurement time and effort.

However, most of the sprays actually used in the industry are composed of a porous nozzle has an asymmetric spray structure. In order to understand such an asymmetric spray structure, path integral data by multi-angular scanning should be measured as shown in FIG. 5.

Here, x, y represents a position on the Cartesian coordinate system, θ represents the scan angle direction coordinate (path integration direction) s, and the perpendicular direction r when the polygonal scan setting angle, x, y coordinate system is rotated by θ. 12 represents the optical diffraction signal measured at No. 9. Using the convolution algorithm, path integral data of volume concentration, SMD (Saunter mean particle diameter), and total droplet surface area density can be converted into local volume concentration, local SMD, and local droplet surface area density distribution, respectively.

In more detail, the path scattering volume ratio calculation provided by the currently commercially available LDPA must know the beam scattering length, and for this reason, a container providing a standard beam scattering length must be prepared. It is very complicated to calculate the path integral volume ratio through this process, and there is a disadvantage that data does not provide local information and only path integrated information. To compensate for this drawback, information at any local point in space can be obtained by tomographic reconstruction using LDPA path integral data by polygonal scanning. LDPA also provides a path integral SMD in addition to the path integral volume ratio. SMD can be obtained at a local point by applying the same method to the SMD as the method for obtaining the local point volume ratio by tomography. Such contents were published by the inventors in the Korean Society of Automotive Engineers Vol. 4, No. 1, published in January 1996.

However, under this principle, the process of acquiring the path integral data by the conventional polygonal scanning method reaches 1200, which is calculated as the number of setting angle × 1-dimensional feed position, which takes time and manual setting process. Can cause many errors.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an apparatus and a method capable of fully automating the measurement by the polygonal scanning method.

Other objects and effects of the present invention will be understood through the accompanying drawings and the following detailed description.

1 is a schematic view of an apparatus for polygonal scanning measurement according to the present invention

2 is a schematic diagram of a particle size measuring device that is an example to which the apparatus of FIG. 1 is applied;

3 is a schematic view of the apparatus of FIG. 1 installed in the particle size measuring apparatus of FIG.

4 is a detailed principle view of the horizontal transfer apparatus of FIG.

5 is a conceptual diagram of path integrating data obtained by polygonal scanning for acquiring data for tomography reconstruction.

* Brief description of symbols for the main parts of the drawings *

20: controller 2: first motor

7: 2nd motor 3, 5: gear

1: Horizontal feeder 4: Sprayer adapter

In order to achieve the above object, the present invention comprises a control unit; Porous atomizer; A rotating unit controlled by the control unit to adjust a rotation angle of the porous atomizer; It is controlled by the control unit, and provides a polygonal scanning measuring device including a horizontal transfer unit for adjusting the horizontal moving distance of the porous atomizer.

Wherein the porous atomizer has a rotating shaft, and the rotating unit includes a first motor controlled by the controller; A first gear rotated by the first motor; It has a second gear meshing with the first gear and mounted to the rotating shaft of the porous atomizer.

The porous nebulizer is supported by a support plate, and the horizontal transfer unit has a second motor controlled by the control unit, a ball screw driven by the second motor, and conveying the support plate.

The control unit is a computer, and an LDPA device is provided below the porous sprayer.

Best Mode for Carrying Out the Invention A preferred embodiment of the polygonal injection measuring apparatus according to the present invention will be described with reference to the accompanying drawings.

1 is a schematic diagram of a device according to the present invention, comprising a nebulizer adapter 4 with a porous atomizer, a rotating part 2, 3, 5, a horizontal conveying part 1, 7 and a control part 20 ) Is included. The porous atomizer shows a spray 6 on the basis of two holes, for example. The horizontal transfer section includes a driven gear 5 mounted on the sprayer mount adapter 4, a drive gear 3 meshing with the driven gear 5, and a step motor 2 for driving the drive gear 3. The stem motor 2 is controlled by a control unit, that is, the PC (20).

On the other hand, the horizontal transfer unit is also made by a ball screw (1) driven by another motor (7), which is also controlled by the PC (20). This ball screw 1 conveys the support plate 21 supporting the sprayer 4 in one dimension, a detailed view of the ball screw 1 being shown in FIG. When the screw shaft 17 is rotated forward or reverse by the motor 7, the ball bearing 27 mounted on the screw shaft 17 moves along the thread of the screw shaft 17 to move the support plate 21. Let's go. At this time, by using the ball bearing 27, it is possible to achieve a precise conveying, of course, it is possible to apply a rack type (rack) just for cost reduction.

FIG. 2 illustrates an LDPA device to which the device of FIG. 1 is applied and includes a laser transmitter 10 for irradiating a laser beam 11 and an optical diffraction signal detector 9 for receiving the same.

3 is a schematic view of applying the apparatus of FIG. 1 to the apparatus of FIG.

First, drive the first motor, that is, the step motor 2, with the PC 20 to fix the required rotation angle, and then drive the second motor, that is, the ball screw drive motor 7, to set the required position, and then measure the second. The measurement is performed while the horizontal position is changed by using the motor 7 to obtain necessary data. In order to measure at the next rotation angle, after adjusting the first motor 2 again, setting the angle of the nebulizer 4, and repeating the above method, desired path integration data can be obtained.

Through this process, the data shown in FIG. 5 can be obtained, and by reconfiguring the tomography, information at any local point in space can be obtained. Reference numeral 13 denotes a horizontal feed direction.

Although the embodiment of the apparatus according to the present invention has been described above, this is merely an example, and various changes and modifications can be understood by those skilled in the art without departing from the spirit of the present invention. It will be apparent from the appended claims that they belong to the scope of the invention.

As described above, due to the apparatus according to the present invention, it is time-consuming to manually set the tomographic reconstruction measurement by polygonal scanning, which is a great way to obtain the local point information of the spray in the past, and in the manual setting process This has the advantage of completely solving the problem that caused many errors. Accordingly, the spray analysis is made simpler and more accurate, thereby contributing to the technical development of various fields in which spray is applied.

Claims (3)

A controller; Porous atomizer; A rotating unit controlled by the control unit to adjust a rotation angle of the porous atomizer; A horizontal transfer unit controlled by the controller to adjust a horizontal moving distance of the porous sprayer Polygon scanning apparatus applied to the particle size measuring apparatus including a. The method according to claim 1, The porous atomizer has an adapter, The rotating unit includes a first motor controlled by the control unit; A first gear rotated by the first motor; A polygonal scan measuring device having a second gear engaged with the first gear and mounted to an adapter of the porous atomizer. The method according to claim 1 or 2, The porous atomizer is supported by a support plate, And the horizontal transfer unit has a second motor controlled by the control unit, and a ball screw driven by the second motor to transfer the support plate.