Discussion
An optical or colour sorter identifies defective material by
Answer: C
Correct answer: Comparing reflected light with a reference
An optical sorter illuminates each particle as it falls past a detector and compares the reflected light with a reference standard set for acceptable material. Where the signal departs from the reference beyond a set tolerance - a discoloured, mouldy, immature or foreign particle - a jet of compressed air deflects it from the stream.
Modern machines extend the principle beyond visible colour to infrared and to shape analysis, allowing defects invisible to the eye, such as internal fungal damage, to be detected as well.
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