Digital system for slope and curvature control
US3983374A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1975 |
| Grant date | Sep 28, 1976 |
| Priority date | — |
| Expiry date | Jun 20, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N29/265
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.