Method and apparatus for measuring timber
AssigneeA. Ahlstrom Osakeyhtio
InventorJorma Tuomaala
Life of this patent
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Abstract
A method and an apparatus for determining the location of a piece of timber having a flat top surface and two unfinished side surfaces or determining the width and location of its flat top surface is described. The piece of timber is subjected to radiation in such a manner that the top surfaces and the side surfaces are simultaneously subjected to radiation of different wave length. Light may be used as the source of radiation and rays of different wave length are reflected from the piece of timber and are separately detected by means of a light sensitive element.
Claims7
A method of determining the location of a piece of timber having substantially flat top and bottom surfaces and two unfinished side surfaces and/or of determining the width and location of its flat top surface, which consists of subjecting said two unfinished sides of said piece of timber simultaneously to radiation, in such a manner that the radiation on the two unfinished sides is of different wave length, and the rays of different wave length reflected from the two surfaces of the piece of timber are filtered and then separated from each other and detected separately.
An apparatus for determining the location of a piece of timber having substantially flat top and bottom surfaces and two unfinished side surfaces and determining the width and location of its flat top surface, which comprises at least one source of radiation, means for directing rays of different wave length from said at least one source of radiation onto the top surface and one side of said piece of timber, means for filtering said rays, means for separating the two rays of different wave length reflected from the two side surfaces of the piece of timber and filtered and means for detecting the reflected and filtered rays.
Dependencies are inferred from the claim text.