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laser scanning
In modern engineering, the term laser scanning is used with two related, but separate meanings. The first, more general, meaning is the controlled deflection of laser beams, visible or invisible.〔Gerald F. Marshall ''Handbook of Optical and Laser Scanning'', Marcel Dekker, Inc., 2004, ISBN 0-8247-5569-3〕 Scanned laser beams are used in some 3-D printers, in rapid prototyping, in machines for material processing, in laser engraving machines, in ophtalmological laser systems for the treatment of presbyopia, in confocal microscopy, in laser printers, in laser shows, in Laser TV, in (ceramic laser treatments ), and in barcode scanners.
The second, more specific, meaning is the controlled steering of laser beams ''followed by a distance measurement'' at every pointing direction. This method, often called ''3D object scanning'' or ''3D laser scanning'', is used to rapidly capture shapes of objects, buildings and landscapes. A laser rangefinder is a device which uses a laser beam to determine the distance to an object.
This article focuses on the general meaning, i.e., on the methods and applications of scanned laser beams.
==Technology==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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