Method and apparatus for measurement of length and height of obj

Details Method and apparatus for measurement of length and height of obj Method and apparatus for measurement of length and height of obj

1983-02-04

1985-07-09

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 96, 367107, 364562, G01S 1588, G01S 752

Patent

active

045286515

ABSTRACT:
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 determine 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 preferrably 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 measurement of objects that may be randomly located across a moving conveyor system.

REFERENCES:
patent: 3513321 (1970-05-01), Sherman
patent: 4206511 (1980-06-01), Ries et al.
patent: 4271477 (1981-06-01), Williams
patent: 4332016 (1982-05-01), Berntsen
patent: 4356850 (1982-11-01), Halgrmson et al.

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