High-speed colour sensor
March 2010
Sensors & Transducers
Colour inspection of glossy objects primarily depends on the correct illumination. For example, when light is directed onto an object at a certain angle the colour detector, apart from sensing the actual colour, also receives influences from the direct reflection of light transmitted by the gloss of the object. This distorts the actual colour of the object and the colours become smoother, ie, red is recognised as pink, blue as bright blue, etc.
ASSTech Process Electronics & Instrumentation’s colour sensor, SPECTRO 3-DIL, effectively suppresses the influence of direct reflection by using diffuse light. The result is that colours are detected more clearly and a reliable colour differentiation of different glossy objects is made possible.
Up to 31 colour references can be stored in the sensor, which determines the colour reference that is closest to the current colour sample. A true-colour chip is used as a colour detector (human colour perception).
Inspection is performed at a scanning rate of 40 kHz and a switching frequency of the digital outputs (5) of 20 kHz.
With its compact M34 aluminium housing and the glass cover of the transmitter and receiver optics, the SPECTRO-3 colour sensor is well suited for rough industrial use.
For more information contact Anastas Schnippenkotter, ASSTech Process Electronics & Instrumentation, +27 (0)11 708 9200, , www.asstech.co.za
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