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High-speed industrial color and position sensors


Blouke, M.M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Sensors, Cameras, and Systems for Scientific/Industrial Applications
Bellingham, Wash.: SPIE, 1999 (SPIE Proceedings Series 3649)
ISBN: 0-8194-3120-6
Meeting on Sensors, Cameras, and Systems for Scientific/Industrial Applications <1999, San Jose/Calif.>
Conference Paper
Fraunhofer IOF ()

High-speed sensors have been developed for industrial color and position analysis. These sensors consist of Si-PIN- diodes covered by miniaturized RGB-interference filters, a micro-lens array, an imaging micro-lens, and a glass cover plate. The basic color-receiver comprises three rhombic Si- PIN diodes arranged in a basic hexagonal pattern with a diameter of 700 $mu@m. To allow a simultaneous color and position control of still samples as well as for moving samples, e.g. samples lying on assembly lines or conveyor belts, the basic pattern has been arranged in two different receiver arrays. Both diode patterns each consisting of 64 diodes are arranged in user-defined arrays making efficient use of the available sensor area. The diodes are individually contacted to provide a rapid access to certain pixels or pixel clusters. Using interference filters the desired spectral band is transmitted to the detector almost without losses and the undersized band is blocked by reflection. The imagi ng microlens determines object distance, total visual field, and resolution. By using a coated glass cover plate the effective range is restricted to the desired spectral region. The object distance is adjustable between 10 mm and 50 mm and the diameter of the visual field is between 5 mm and 50 mm. The maximum variance in object height is 0.5 mm and the maximum lateral resolution is 0.5 mm by 0.5 mm. The operating frequency of the total sensor system depends on the data processing unit and is between 2 kHz and 10 kHz. These sensors make high-speed color analysis possible for a frequency range in which CCD-systems are too slow.