WO2024088498A1 - Verfahren und vorrichtung zum sortieren von siliciumbruchstücken - Google Patents
Verfahren und vorrichtung zum sortieren von siliciumbruchstücken Download PDFInfo
- Publication number
- WO2024088498A1 WO2024088498A1 PCT/EP2022/079552 EP2022079552W WO2024088498A1 WO 2024088498 A1 WO2024088498 A1 WO 2024088498A1 EP 2022079552 W EP2022079552 W EP 2022079552W WO 2024088498 A1 WO2024088498 A1 WO 2024088498A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fragment
- light
- fragments
- measuring device
- height information
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 11
- 239000012634 fragment Substances 0.000 claims abstract description 85
- 238000000926 separation method Methods 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 14
- 230000004888 barrier function Effects 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 7
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 23
- 229920005591 polysilicon Polymers 0.000 description 21
- 238000011156 evaluation Methods 0.000 description 13
- 239000000523 sample Substances 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 238000002231 Czochralski process Methods 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/04—Sorting according to size
- B07C5/10—Sorting according to size measured by light-responsive means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/363—Sorting apparatus characterised by the means used for distribution by means of air
- B07C5/367—Sorting apparatus characterised by the means used for distribution by means of air using a plurality of separation means
- B07C5/368—Sorting apparatus characterised by the means used for distribution by means of air using a plurality of separation means actuated independently
Definitions
- the invention relates to a method for sorting silicon fragments.
- Polycrystalline silicon is usually produced by the Siemens process (chemical vapor deposition process).
- filament rods thin rods made of silicon are heated in a reactor by direct current passage, and a reaction gas containing a silicon-containing component (e.g. monosilane or halosilane) and hydrogen is introduced.
- the surface temperature of the filament rods is usually more than 1000 °C.
- the silicon-containing component of the reaction gas decomposes and elemental silicon is deposited from the gas phase as polysilicon on the rod surface, increasing the rod diameter. Once a predetermined diameter has been reached, the deposition is stopped and the resulting polysilicon rods are removed.
- Polysilicon is the starting material in the production of single-crystal silicon, which is produced, for example, using the Czochralski process. It is also required for the production of multicrystalline silicon, for example using the ingot casting process. Both processes require the polysilicon rods to be broken down into fragments. The fragments are usually classified according to size in separating devices.
- the separation devices can be multi-stage screening machines that mechanically classify the polysilicon fragments into different size classes.
- US 6,375,011 Bl a vibrating conveyor that enables classification into three size classes.
- US 6,265,683 Bl describes an optopneumatic device for classifying semiconductor materials, whereby the size separation is carried out using a camera and by detecting a projection surface of the materials to be sorted. If necessary, the materials can also be sorted according to their surface properties.
- the known methods which are based on a two-dimensional (2D) projection of fragments using the transmitted light method, have the disadvantage that the fragments are only recorded from one side. Fragments can differ greatly in terms of their shape. It can happen that a fragment is oriented so poorly on its projection surface at the time of recording that its longest dimension is in front of or behind the projection surface (i.e. perpendicular to the projection surface). The result is an incorrect assessment of the size of the fragment (missorting).
- This object is achieved by a method for sorting fragments, in particular silicon fragments, comprising the following steps.
- the additional measuring device makes it possible to add height information to the projection surface of the fragment obtained with the help of the first measuring device.
- the measuring devices are preferably arranged in different positions around the fragment, i.e. they view it from different angles. Information can therefore be obtained about the extent of the fragment above and/or below the profile plane (in the direction of the applicate axis (z-axis)) in order to prevent incorrect sorting. In this way, the separation quality is improved.
- the fragments are preferably crushed polysilicon, e.g. crushed polysilicon rods from the Siemens process. Separating the fragments means in particular that the fragments are spaced apart from one another, i.e. they are no longer arranged one above the other or partially overlapping. This can be done, for example, by a shaking movement on a conveyor belt. It is not absolutely necessary for the fragments to be arranged in a row (behind or next to one another) for detection by the measuring device.
- the first measuring device and at least one of the further measuring devices are a photoelectric transmitted light or incident light measuring system with a detection region through which the fragment passes.
- the fragment passes the detection area in free fall.
- the incident light measuring system preferably comprises a light section sensor and/or at least one camera system.
- the light section method carried out with the light section sensor is based on optical triangulation and requires a relative movement of the sensor and the fragment.
- the fragment is illuminated linearly with a suitable light source and the resulting light strip is recorded using an area camera (part of the sensor).
- the surface normals of the light source and the camera are tilted to each other at a triangulation angle.
- the camera system can also consist of just one camera that uses ambient light as a light source to capture the projection surface of the book piece.
- the camera is supplemented by an external light source.
- This is a method for analyzing projection areas and reflections of a surface of an object (fragment) in three-dimensional (3D) space.
- an external light source is aimed at the object and moved to obtain several images of the resulting light scenarios.
- several cameras with different viewing angles are used instead of the moving light source.
- several light sources, each with a different illumination direction and one camera, or a combination of several light sources and several cameras can be used.
- the transmitted light measuring system preferably comprises a light barrier, a light curtain or a light grid.
- Light beams e.g. infrared
- the transmitted light measuring system preferably comprises a light barrier, a light curtain or a light grid.
- Light beams e.g. infrared
- an optical transmitter light barrier
- several spaced-apart transmitters light grid/curtain.
- a signal can be sent to a control device and, as a result, a deflection device can be triggered, for example.
- the resolution of light grids and curtains can be determined by the spacing of the beams.
- Typical examples of such measuring systems are optical micrometers, light band micrometers, profile projectors, CCD laser micrometers and laser sensors with light barrier function.
- the first measuring device is a camera system, in particular comprising a light source and a camera for capturing the projection surface.
- the additional measuring device is preferably a light curtain or grid, especially if a camera system was chosen as the first measuring device.
- the detection of the projection surface and the detection of the height information take place at a time interval of 0 to 100 ms, preferably 0 to 50 ms, particularly preferably simultaneously.
- a time interval of 0 to 100 ms, preferably 0 to 50 ms, particularly preferably simultaneously.
- the deflection device responsible for sorting the fragments can be a pneumatic and/or mechanical deflection device.
- the pneumatic deflection device preferably comprises at least one nozzle from which gases (e.g. air, inert gas) or liquids (e.g. ultrapure water) are ejected at pressures of 3 to 20 bar.
- gases e.g. air, inert gas
- liquids e.g. ultrapure water
- the method according to the invention is an optopneumatic classification method.
- the size of the fragment can be calculated using an evaluation device (e.g. software-supported process control station, e.g. MATLAB (MathWorks)), which is connected to both the measuring devices and the deflection device.
- the basic measurement information obtained with the first measuring device is the projection surface of the fragment, which contains information about the shape of the fragment, albeit only 2D as a contour. From the projection surface, the evaluation device can obtain various length specifications, in particular diameters, which allow conclusions to be drawn about the size of the fragment. In general, numerous methods are known for determining length specifications or diameters.
- the height information obtained by means of the additional measuring device can in particular be a height value (unit of length).
- the combination of the measurement information obtained is then, for example, a 3D point cloud consisting of the contour obtained with the first measuring device and a contour shifted by the height value.
- a calculation of the greatest extent can be made from the length of a vector between the points furthest from each other:
- a further aspect of the invention relates to a device for sorting fragments, in particular silicon fragments, comprising
- At least one first measuring device for detecting the projection area of a fragment in a 2D profile plane
- an evaluation device which calculates a size of the fragment from the projection area and the height information and controls the deflection device depending on this size.
- it is a device for carrying out the described method.
- the separation area preferably comprises at least one vibrating conveyor trough and/or a conveyor belt. If necessary, the separation area can also contain a sieve plate or a vibrating sieve for removing fine particles. In general, it can also be the section of a conveyor belt on which the fragments are separated. A suction system for dust particles can also be provided. It is preferably a separation area as described in EP 0 983 804 A1.
- the device preferably comprises a plurality of first and/or further measuring devices in order to enable high-throughput sorting. By means of a plurality of measuring devices in combination with a high computing power of the evaluation device, the distance between individual fragments can be reduced to a minimum.
- it is a pneumatic or mechanical deflection device, in particular a pneumatic deflection device comprising a row or a matrix of individual nozzles.
- Fig. 1 Device according to the invention with light grid (transmitted light measuring system).
- Fig. 2 Device according to the invention with light section sensor (light measuring system).
- Figure 1 shows a sorting device 100 which comprises a vibrating conveyor belt 10 as a separation area and an inclined sliding surface 20.
- the feed direction of separated fragments 30 is indicated by means of movement arrows 12.
- a camera 40 with an external light source 42 is arranged below the sliding surface 20.
- the camera 40 is, for example, a CCD camera with an optical resolution of 0.05 to 2.0 mm.
- the light source 42 is, for example, an LED with a diffuse surface illumination.
- a detection area 44 of the first measuring device, related to the fragment 30, is indicated as a star.
- a light grid 50 is attached to a lower end 22 of the sliding surface 20. This consists of a transmitter bar 52 with a total of five infrared light sources (laser or LED light sources or light points in the visible range are also conceivable), the radiation of which is indicated by a dashed line 54. and a receiver bar 56, which accordingly has five sensors.
- the evaluation device is a computer with image processing software, e.g. MATLAB.
- This can generally be adapted to the size of the fragments by means of a sliding surface 20 with an adjustable angle.
- the fragment 30 passes the light grid 50 after the sliding surface end 22 in such a way that its elongated side points in the z direction and is thus recorded over its full length by the light grid 50.
- the fragment 30 then passes the detection area 44 of the camera 40 in free fall, whereby the camera only records a projection area 32 corresponding to the base area of the fragment 30.
- FIG. 2 shows a further sorting device 200 according to the invention, which essentially corresponds to that in Figure 1 (corresponding elements have corresponding reference numerals; the evaluation device, deflection device and collecting containers have been omitted).
- the sorting device 200 has a light section sensor 60 as a further measuring device.
- the light section sensor 60 uses the triangulation principle to determine the height information (3D profile detection).
- a laser beam is expanded to a laser line 63 (represented by the finely dashed lines) via a special optics and projected onto the surface of the passing fragment 30.
- the receiving optics 64 images the light 65 reflected from the surface (represented by the coarsely dashed lines) on a sensor matrix.
- An evaluation device (not shown) connected to the light section sensor 60 can calculate the height information of the passing fragment (z-axis) from the obtained matrix image along the laser line (x-axis). This information can then be output in a sensor-fixed two-dimensional coordinate system. In the case of moving objects or when the sensor is traversed, 3D measurement values can also be determined.
- the size class of polysilicon fragments is defined as the longest distance between two points on the surface of a silicon fragment (corresponds to the maximum length):
- the polysilicon sample material used for the test was prepared from a mixture of 9000 fragments in the length range 10 to 40 mm (BG2) and 1000 fragments in the length range > 40 to 65 mm, the fraction to be separated.
- BG2 9000 fragments in the length range 10 to 40 mm
- W nominal hole size
- W 4 mm (square holes)
- This polysilicon sample material was subjected to conventional optopneumatic sorting of the fraction > 40 mm.
- the optopneumatic sorting device used was equipped with a first 2D measuring device (CCD camera and light source as shown in Fig. 1) to record a projection area of the fragments.
- the fragments passed the detection area of the measuring device individually (usually 0.5 - 10 mm distance between the fragments) over an inclined sliding plane.
- the measuring device was coupled to an evaluation device on a process control station.
- the deflection device comprising an approximately 50 cm wide nozzle bar with two rows of 100 nozzles, connected. A separation cut of 40 mm was set at the control station.
- the polysilicon sample material described in the comparative example was separated using an essentially identical optopneumatic sorting device (with a separation cut of 40 mm). In contrast to comparative example 1, however, the device had a second 2D measuring device. This was a light grid as described for Fig. 1.
- the image acquisition with the first measuring device is carried out as a sensor line and delivers the shadow cast by the fragments per unit of time as a vector x with gray values [0. .255] .
- the fragment lengths were checked manually.
- the polysilicon sample material was then finished by mixing.
- the polysilicon sample material was sorted using the optopneumatic sorting device described in Comparative Example 1, but with a separation cut of 60 mm.
- the polysilicon sample material described in Comparative Example 2 was sorted here using an opto-pneumatic sorting device as shown in Fig. 2.
- This device therefore had a second measuring device in the form of a light section sensor, consisting of a laser projector and a receiving optics.
- the aim of every sorting is basically a clean cut without slippage to a fragment size.
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Silicon Compounds (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020247020579A KR20240112895A (ko) | 2022-10-24 | 2022-10-24 | 규소 단편을 선별하는 방법 및 장치 |
EP22809680.6A EP4429831A1 (de) | 2022-10-24 | 2022-10-24 | Verfahren und vorrichtung zum sortieren von siliciumbruchstücken |
CN202280083841.6A CN118401319A (zh) | 2022-10-24 | 2022-10-24 | 用于分选硅块的方法 |
PCT/EP2022/079552 WO2024088498A1 (de) | 2022-10-24 | 2022-10-24 | Verfahren und vorrichtung zum sortieren von siliciumbruchstücken |
TW112131060A TW202417127A (zh) | 2022-10-24 | 2023-08-18 | 用於分選矽碎塊的方法及裝置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2022/079552 WO2024088498A1 (de) | 2022-10-24 | 2022-10-24 | Verfahren und vorrichtung zum sortieren von siliciumbruchstücken |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2024088498A1 true WO2024088498A1 (de) | 2024-05-02 |
Family
ID=84361698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/079552 WO2024088498A1 (de) | 2022-10-24 | 2022-10-24 | Verfahren und vorrichtung zum sortieren von siliciumbruchstücken |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP4429831A1 (de) |
KR (1) | KR20240112895A (de) |
CN (1) | CN118401319A (de) |
TW (1) | TW202417127A (de) |
WO (1) | WO2024088498A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0983804A1 (de) | 1998-09-03 | 2000-03-08 | Wacker-Chemie GmbH | Klassiervorrichtung |
US6375011B1 (en) | 1999-04-01 | 2002-04-23 | Wacker-Chemie Gmbh | Vibrating conveyor and method for conveying silicon fragments |
US20070235574A1 (en) | 2006-04-06 | 2007-10-11 | Wacker Chemie Ag | Method and Device For Comminuting and Sorting Polysilicon |
US20090021751A1 (en) * | 2006-03-02 | 2009-01-22 | Tomas Jonasson Bjarang | Device and Method for Optical Measurement of Grains From Cereals and Like Crops |
WO2015017623A1 (en) * | 2013-08-02 | 2015-02-05 | Tsi, Inc. | High speed spectroscopic sensor assembly and system |
-
2022
- 2022-10-24 CN CN202280083841.6A patent/CN118401319A/zh active Pending
- 2022-10-24 EP EP22809680.6A patent/EP4429831A1/de active Pending
- 2022-10-24 WO PCT/EP2022/079552 patent/WO2024088498A1/de active Application Filing
- 2022-10-24 KR KR1020247020579A patent/KR20240112895A/ko unknown
-
2023
- 2023-08-18 TW TW112131060A patent/TW202417127A/zh unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0983804A1 (de) | 1998-09-03 | 2000-03-08 | Wacker-Chemie GmbH | Klassiervorrichtung |
US6265683B1 (en) | 1998-09-03 | 2001-07-24 | Wacker-Chemie Gmbh | Semiconductor material classification device |
US6375011B1 (en) | 1999-04-01 | 2002-04-23 | Wacker-Chemie Gmbh | Vibrating conveyor and method for conveying silicon fragments |
US20090021751A1 (en) * | 2006-03-02 | 2009-01-22 | Tomas Jonasson Bjarang | Device and Method for Optical Measurement of Grains From Cereals and Like Crops |
US20070235574A1 (en) | 2006-04-06 | 2007-10-11 | Wacker Chemie Ag | Method and Device For Comminuting and Sorting Polysilicon |
WO2015017623A1 (en) * | 2013-08-02 | 2015-02-05 | Tsi, Inc. | High speed spectroscopic sensor assembly and system |
Also Published As
Publication number | Publication date |
---|---|
KR20240112895A (ko) | 2024-07-19 |
EP4429831A1 (de) | 2024-09-18 |
TW202417127A (zh) | 2024-05-01 |
CN118401319A (zh) | 2024-07-26 |
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