NZ776086B2 - Classification method and apparatus - Google Patents
Classification method and apparatusInfo
- Publication number
- NZ776086B2 NZ776086B2 NZ776086A NZ77608618A NZ776086B2 NZ 776086 B2 NZ776086 B2 NZ 776086B2 NZ 776086 A NZ776086 A NZ 776086A NZ 77608618 A NZ77608618 A NZ 77608618A NZ 776086 B2 NZ776086 B2 NZ 776086B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- detection region
- electromagnetic radiation
- detection
- threshold
- radiation
- Prior art date
Links
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
- B07C2501/00—Sorting according to a characteristic or feature of the articles or material to be sorted
- B07C2501/0018—Sorting the articles during free fall
-
- 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
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
- B07C5/3425—Sorting according to other particular properties according to optical properties, e.g. colour of granular material, e.g. ore particles, grain
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/2518—Projection by scanning of the object
- G01B11/2522—Projection by scanning of the object the position of the object changing and being recorded
-
- 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
- G01N2021/845—Objects on a conveyor
-
- 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
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
Abstract
The invention relates to an apparatus for object classification, the apparatus comprising a transport mechanism arranged to transport an object stream so that said object stream, after leaving the transport mechanism, follows an unsupported path, along which it is fed through a detection region; a radiation source being configured to emit electromagnetic radiation in a first direction for illuminating the detection region, which radiation source is configured to generate a line illumination; a detection unit arranged to view said detection region along a second direction and to detect electromagnetic radiation reflected by an object in the detection region, wherein the first direction and the second direction have a cross-section in the detection region and forms an angle relative each other within the range of 3° - 80° or 10° - 80°; an analysis unit in operational connection with the detection unit and arranged to determine transparency or reflection information by comparing electromagnetic radiation from the illumination that is directly reflected by an object in the object stream to at least one threshold or look-up table to determine if the material present in the detection region is transparent and thereafter setting the transparency or reflection information; and a removal unit configured to remove objects from the object stream based on the outcome of the analysis.
Claims (4)
1. An apparatus for object classification, the apparatus comprising: - a transport mechanism arranged to transport an object stream so that said object , after g the transport mechanism, follows an unsupported path, along which it is fed through a ion ; - a radiation source being configured to emit electromagnetic radiation in a first direction for illuminating the detection region, which radiation source is configured to te a line illumination; - a detection unit arranged to view said ion region along a second ion and to detect electromagnetic ion reflected by the at least one object in the detection region, wherein the first direction and the second direction have a cross-section in the detection region and forms an angle relative each other within the range of 3° - 80° or 10° - 80°; - an analysis unit in operational connection with the detection unit and arranged to determine arency or reflection information by comparing electromagnetic radiation from the illumination that is directly reflected by the at least one object in the object stream to at least one threshold or look-up table to determine if the material present in the detection region is transparent and thereafter setting the transparency or reflection information; and - a removal unit configured to remove objects from the object stream, wherein said removal of objects is based on the analysis in the analysis unit.
2. The apparatus according to claim 1, wherein the analysis unit is further arranged to determine transparency information by comparing electromagnetic radiation from the illumination that is directly reflected by the at least one object in the object stream to a first threshold or p table to determine that there is material present in the detection , and thereafter comparing electromagnetic radiation from the illumination that is directly reflected by said at least one object to a second threshold or a second look-up table to determine if the present material is transparent, wherein the second threshold lies above the first threshold, and thereafter setting the transparency information.
3. The apparatus according to claim 2, n the detection unit is further configured to sense omagnetic radiation reflected by a point on a background element where the electromagnetic radiation from the radiation source impinges said background element.
4. The apparatus according to claim 1, sing a plurality of radiation sources configured to illuminate objects in the object stream in a plurality of positions along the unsupported path. W0 43231
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP17189017.1A EP3450029A1 (en) | 2017-09-01 | 2017-09-01 | Classification method and apparatus |
| NZ762809A NZ762809B2 (en) | 2017-09-01 | 2018-09-03 | Classification method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ776086A NZ776086A (en) | 2025-03-28 |
| NZ776086B2 true NZ776086B2 (en) | 2025-07-01 |
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