High resolution compact optical sensor for scanning...

G - Physics – 01 – B

Patent

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G01B 11/24 (2006.01) G01B 11/25 (2006.01)

Patent

CA 2086378

An optical sensor for three dimensional shapes includes a laser that produces a lamellar plane beam which illuminates the surface of an object. The lamellar plane beam produces a curvilinear luminous trace that is scanned by at least one video camera, to produce information that is then converted into digital data representing pixel coordinates. The sensor includes a lightbox having a common housing that is positioned a short distance above the object to be scanned. The lightbox housing also includes a laser source that produces a coll1mated rectilinear beam and an optical device for converting the rectilinear beam into the lamellar plane beam. The lightbox housing also includes a device for lengthening the optical path of the lamellar plane beam, comprising two fixed plane mirrors in face to face relationship to produce a plurality of reflections between a bçam entry point and beam exit point of the lightbox. The small physical distance between the housing and the object is compensated by a virtual optical distance so that there is a correlative increase in the depth of field of the usable region of the lamellar plane beam at the beam exit point from the housing.

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