Detection of thermal damage in composite materials using low field nuclear magnetc resonance testing
US5786691A · kind A · utility
4Cited by
3References
16Claims
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Key dates
| Filing date | Jan 30, 1997 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Jan 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Thermal damage in resin-matrix composite materials is detected using a low field NMR nondestructive testing technique. The technique involves subjecting the resin-matrix composite material to an NMR measurement of the spin-lattice relaxation (T.sub.1) at a low magnetic field strength and/or the spin-lattice relaxation of local field order (T.sub.1D) at any field strength. Thermal damage is evident as an increase in T.sub.1 and T.sub.1D.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.