| 摘要 |
A system for imaging and sorting product such as foodstuffs and plastic pellets in a product flow. An illumination unit 3 comprises two sources 5a, 5b for providing illumination at first and second, different wavelengths. A detector unit 15 detects reflected illumination from product P in the product flow, and comprises first and second line array detectors 17a, 17b., each comprising a plurality of pixel elements and extending as lines L1, L2 across a width of the product flow, one line downstream of the other, whereby product passing a pixel element of the first line array detector 17a passes a corresponding pixel element of the second line array detector 17b. A control unit 21 triggers the illumination sources to flash sequentially at a scan rate corresponding to the flow rate of the product flow. An image processing unit 25 successively reads the pixel lines of the first and second line array detectors 17a, 17b and constructs images of the product at each of the illumination wavelengths, and provides for characterization of the product at each of the illumination wavelengths.
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