Producing signals responsive to a parameter of successive...

Details Producing signals responsive to a parameter of successive... Producing signals responsive to a parameter of successive...

B - Operations, Transporting

07

C

73/56

B07C 5/342 (2006.01) G01N 21/47 (2006.01)

Patent

CA 1276809

ABSTRACT OF THE DISCLOSURE In order to colour sort objects such as peas or sweets, they are dropped in succession through two integrating spheres. In the first sphere, the object absorbs infra-red radiation and the peak reduction in infra-red flux is detected in order to provide a signal responsive to the size of the object. In the second sphere, the object is illuminated with white light and the peak reduction in flux is detected by at least, three detectors for three colours determined by filters. To make the illumination more uniform in the sphere, there is a step around the sphere almost half way down, with the light sources equi-spaced around the step. The size signal is divided into the respective colour signal in a micro-processor to produce a size-corrected colour signal.

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