G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 11/04 (2006.01) G01B 11/00 (2006.01) G01B 11/02 (2006.01) H04N 7/18 (2006.01)
Patent
CA 2160920
A method for automatical, contactless and optical video measur- ing of the dimension of one or more objects being at rest or being conveyed parallel along a straight path. The measuring system as il- lustrated in figure 2 is based on the fact that a CCD video camera (5) through two parabola-shaped mirrors (3, 4), in the course of 6 to 12 lines, senses a section of the objects (7) to be measured, perpendicular to the direction of motion thereof. The parabola-shaped mirrors con- tribute to avoid erroneous measurements which, otherwise, would have arisen due to camera optics and the varying distance to the objects to be measured. The object to be measured is illuminated obliquely by means of two elongated light sources (1, 2). Camera and mirrors are mounted in a dust-tight cabinet, allowing the contrast information of the object to be measured to pass only through an elongated aperture (8), covered by a glass adpated to shut out light of unfavorable wave length. By means of electronics, the video informations are converted into TTL levels and digitized. Binary number representations for the dimension values are laid out to a communication gate, such that they can be fetched by a computer. The measurement takes place individu- ally for each single object to be measured. Used as a kerf controller at saw or timber mill, the operator will be informed of the actual values, and an alarm could be given if the actual values differ more from the reference values set than a predetermined limiting value.
Ridout & Maybee Llp
Rydningen Toni
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