Method of and apparatus for detecting cross sectional area variations in an elongate object by the non-inductive measurement of radial flux variations
US5036277A · kind A · utility
17Cited by
18References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1988 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Nov 18, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus is provided for electromagnetically testing an elongate object such as a wire rope for cross-sectional area variations. The elongate object is magnetized over adjacent sections in opposing directions along a longitudinal axis of the elongate object. Variations in axial magnetic flux, which have been observed to be coincident with variations in the cross-sectional area of an elongate object, are measured by a plurality of non-inductive transducers. The transducers are interconnected to produce a composite signal. The composite signal is compared to a reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.