Electromagnetic method for non-destructive testing of prestressed concrete pipes for broken prestressing wires
US6127823A · kind A · utility
53Cited by
5References
10Claims
0Family size
Inventor
Key dates
| Filing date | Oct 8, 1997 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Oct 8, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/902
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for detecting breaks in a prestressed wire, rod or bar embedded in concrete surrounding a metal pipe is described. A remote field eddy current probe is traversed axially internally through the pipe so as to create an energy flow path externally of the pipe and a transformer coupling through the pipe, and generate a signal in a detector coil axially spaced from an exciter coil. As the exciter coil traverses the wire, rod or bar containing the break a signal change is generated, regardless of the radial position of the detector coil relative to the break.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.