Digital system for slope and curvature control

Registers – Transfer mechanism – Traveling pawl

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Details

73 678S, 33 1P, G01N 2904, G06F 1520

Patent

active

039833747

ABSTRACT:
A digital control system is provided for controlling the indexing of the focussed beam of an ultrasonic transducer over a sloped or curved surface of a workpiece being inspected for flaws. To index the transducer to follow a sloped surface on the workpiece the angle of the sloped surface in half degree incrementation is setup and used to read out the sine and cosine functions from a memory. At the index time of a scan each of these functions is used to pass a portion of a preset number of clock pulses to provide vertical and horizontal clock pulses which respectively increment stepping motors to reposition the transducer along the sloped surface. To index the transducer to follow a curved surface on the workpiece, the radius of the circumferential path along which the transducer is to be moved is setup and used to help define when the transducer has moved along a chord of a half degree angle. At that time the angle setup defining the slope of the chord is incremented by one half degree, the transducer is gimballed by one half degree, and the sine and cosine functions of the incremented angle are read out of the memory and used to pass portions of the clock pulses provided at the index time of the next scan to thereby provide vertical and horizontal clock pulses which respectively increment stepping motors to move the transducer along a succeeding chord of a half degree angle along the circumferential path.

REFERENCES:
patent: 3134099 (1964-05-01), Woo
patent: 3309913 (1967-03-01), Weighart
patent: 3678736 (1972-07-01), May
patent: 3721118 (1973-03-01), Jeffras
patent: 3765229 (1973-10-01), Spencer et al.
patent: 3857052 (1974-12-01), Beller
patent: 3863496 (1975-02-01), Hiramatsu et al.

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