Electronically scanned eddy current flaw inspection
US4785243A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1987 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | Jan 29, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9013
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for performing eddy current flaw inspection on workpiece material such as steel bar stock. A drive mechanism propels a workpiece longitudinally along a workpiece path. An array of electromagnetic transmitter coils is disposed about the workpiece path. An electromagnetic source energizes the transmitter coils under control of multiplexing circuitry. The multiplexing circuitry and source actuate respective transmitter coils in a predetermined iterative sequence. The sequential actuation induces eddy currents in the workpiece at a succession of locations extending iteratively about the workpiece circumference. Circuitry coupled to multiple, differentially wound sensing coils detects variations in eddy current produced in the workpiece and utilizes these detected variations to produce flaw indicating signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.