Nipkow disk


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Nipkow disk

[′nip·kō ‚disk]
(computer science)
In optical character recognition, a disk having one or more spirals of holes around the outer edge, with successive openings positioned so that rotation of the disk provides mechanical scanning, as of a document.
References in periodicals archive ?
Confocal imaging via improved Nipkow disk with micro lenses (Yokogawa; tunable speed 1500-5000 rpm), fixed 4-band dichroic 405 nm + 488 nm + 561 nm + 640 nm and fast filter wheel for emission at 450/50, 525/50, 605/70 and 690/50 nm : - Laser rack with solid state lasers controlled by AOTF: 405 nm, 488 nm, 561 nm, 638 nm : - Apo-chromatic corrected with fiber-coupled epifluorescence illumination including integrated high-speed shutter (TTL-controllable).
The Nikon Confocal Nexiv uses a Nipkow disk, which features multiple, symmetrically placed spirals of pinhole apertures through which light is passed and split into "mini-beams.
Systems incorporating Nipkow disks and similar scanning head technologies are overcoming some of the problems that limited their applications in decades past.