Product category:
Optoelectronic Sensors, Switches and Receivers
News Release from: Optek Technology | Subject: OPB780
Edited by the Electronicstalk Editorial
Team on 28 June 2006
On reflection sensor sorts by colour
A reflective sensor offers the capability to reliably sort or match surfaces by colour.
Providing design engineers a reflective sensor with the capability to reliably sort or match surfaces by colour, TT electronics Optek Technology has developed its OPB780 reflective colour sensing assembly for introduction at the Sensors Expo and Conference According to Roland Chapa, Optek Technology's Assemblies Business Unit Director, the reflective colour sensor assembly is ideal for use in photometric applications
This article was originally published on Electronicstalk on 31 May 2005 at 8.00am (UK)
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"The assembly is able to provide high resolution digital measurement of the red, green, and blue components of the light reflected from surface being sensed", explained Chapa.
"The small footprint of the sensor also makes the device ideal for space-confined areas".
Applications where the colour sensor is being implemented include pill sorting machinery in pharmaceutical applications, ink and/or paper colour detection for office machines, colour printer calibration sensors, as well as colour-match sensing in paint, textile and cosmetic manufacturing.
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The assembly's white LED illuminates the surface of the object or liquid being sensed, with the reflected light then received by an 8 x 8 photodiode array.
The array consists of four selectable groups of red-, green-, blue- and clear-filtered photodiodes, with each group of 16 photodiodes integrating the reflected filtered light to minimise any nonuniformity.
A light-to-frequency convertor in the CMOS monolithic sensor enables the assembly to communicate directly with a micro-controller, producing a square wave output with a frequency directly proportional to light intensity.
Operating from a 5V power supply, the OPB780 Series colour sensor has a typical nonlinearity error of 0.2% at 50kHz.
The LED in the colour sensor assembly has a typical luminous intensity of 1100mcd and a typical forward voltage of 3.6V.
Maximum forward current is 30mA, with a pulse forward current of 100mA.
The maximum reverse voltage is 5V with a power dissipation of 120mW.
The reflective colour sensor assembly is housed in a plastic design capable of being mounted to a printed circuit board or flush mounted to a surface using clips.
From the assembly the interface to the application is designed for a zip compatible cable, which can be provided as a customer specific design.
The total assembly is 27.4 x 21.4 x 9mm, allowing it to be incorporated easily to most any application.
For this assembly the maximum operating temperature range is -30 to +85C.
Typical pricing for the OPB780 colour Sensor is $11.04 in quantities of 10K pieces.
Lead time, if stock is not available, is from 8 to 10 weeks.
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