Scanning of workpieces such as lumber cants

Details Scanning of workpieces such as lumber cants Scanning of workpieces such as lumber cants

G - Physics

01

B

340/123.4

G01B 11/04 (2006.01) B27B 31/06 (2006.01) G01B 11/245 (2006.01)

Patent

CA 1128164

Abstract of the Disclosure An array camera used to scan elongated workpieces moving through a measuring zone transversely to their lengths has its photoresponsive detector elements aligned lengthwise of the workpieces, with optical axes of the elements lying in a common plane intersecting the measuring zone. Each element "sees" only a small (e.g., 8 x 8 mm) pixel. Radiation sources are located at opposite sides of said plane and emit radiation towards the measuring zone to be reflected to the elements from workpieces. During each of a succession of short measuring cycles (e.g., 4 millisecond duration) each element is exposed successively to radiation originating from each radiation source to the exclusion of the other, to thus produce an A output and a B output during each cycle, and is also exposed to sub- stantially low level radiation to produce an R output. For each cycle, the R output of at least certain elements is subtracted from the A and the B outputs of the same elements for the same cycle, to produce ? A and ? B difference signals. Timing is such that ? A and ? B signals for the same element and cycle originate from one and the same small surface area on the workpiece, and therefore inclination of that surface area is ascertainable as a function of the ? A and ? B values. During a fourth interval in each cycle, certain elements detect radiation from a laser that has its beam in said plane and oblique to the workpiece surface, and such elements then produce an L output. From the particular elements that produce L outputs, local thickness of the workpiece is ascertainable.

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