Colour mark detector
26 October 2011
Opto-Electronics
ASSTech Electronics & Instrumentation has available the Spectro-3-FIO colour mark detector that can detect colour like a human, but at a higher frequency of around 40 kHz. The use of reflected-light optical fibres allows this sensor to be employed in Ex areas.
A super-bright white LED is directed onto the colour mark to be detected. Various optical fibres and attachment optics units are available to ensure high-precision detection. For example, at a distance of approximately 10 mm from the object, the light spot can have a diameter of 0,5 mm or dimensions of 2 x 0,2 mm or 4 x 0,7 mm.
An integrated threefold receiver for the red, green and blue content of the light that is reflected from the object, or the light that is emitted by a self-luminous object, is used as a receiver. A special feature is that the gain of the receiver can be set in eight steps, making it possible to optimally adjust the sensor to almost any surface. With the ‘teach’ button on the sensor’s housing, it can be taught up to 31 colours.
All parameters and measurement values can be exchanged between a PC and the colour sensor through the serial RS232 interface. Once set, the sensor continues to operate with the current parameters in standalone mode without the PC.
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