G - Physics – 01 – S
Patent
G - Physics
01
S
349/33
G01S 15/88 (2006.01) G01B 17/00 (2006.01) G01S 7/52 (2006.01)
Patent
CA 1231430
ABSTRACT OF THE DISCLOSURE The invention is a method and apparatus for non-contact measurement of the length and height or diameter of geometrically regular objects. The objects enter a first measurement station where horizontally opposed echo ranging transducers make sequential differential measurements to deter- mine the length and transverse position of the object. Position information is sent to a microprocessor. The object is then advanced under a transverse array of downwardly oriented echo ranging transducers. The microprocessor preferably selects the single transducer located most closely to the mid- length position of the object to make a height or diameter measurement. In the case of cylindrical objects, the object should be oriented with its axis parallel to a line projected between the opposed length measuring transducers. As the object is moved by the diameter sensing transducer, the microprocessor selects the measurement indicating the shortest distance between the object and the transducer. Diameter of the object can then be readily determined. The invention is particularly well adapted for measure- ment of objects that may be randomly located across a moving conveyor system.
483484
Brock Gregory K.
Knowlen Bruce R.
Osler Hoskin & Harcourt Llp
Weyerhaeuser Company
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