Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1980-07-28
1982-11-09
Rosenberger, R. A.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
356445, 356237, 250571, G01N 2184
Patent
active
043582028
ABSTRACT:
Apparatus and method for optically scanning the circumference of a generally circular section of a test object, and especially for monitoring the surface character of cables and the like. An optical system has its apparent axis substantially concentric with the centerline of the path along which the cable moves relative to the scanning optics. A beam of radiation is caused to rotate or orbit about that axis and is then directed into near-normal incidence with the surface of the test object such that it is specularly reflected by the surface. The optical system redirects the reflected beam toward one or more detectors, the intensity of outputs of which provide an indication of the surface character of the object.
In a preferred embodiment, a radiation source beam offset from the actual cable path is rotated by a pair of oscillating mirrors such that it describes a divergent conical shape. Certain optics direct a 180.degree. portion of that rotating beam along one path to intersect with a corresponding 180.degree. segment of the cable and a dividing mirror and similar optics direct the other 180.degree. portion of the beam along another path to intersect with the remaining or complementary 180.degree. segment of the cable. By so dividing the beam paths, a full 360.degree. scan of the cable surface is obtained without the cable "shadowing" any part of the incoming beam. The reflected radiation is "returned" along two respective paths to a respective pair of detectors. Some of the optical elements may be movable relative to others to facilitate coupling and uncoupling the apparatus with the cable.
REFERENCES:
patent: 4283145 (1981-08-01), Miyazawa
Puffer LeRoy G.
Waters James P.
Essex Group Inc.
Rosenberger R. A.
Schneeberger Stephen A.
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