Diagnostic layer and methods for detecting structural integrity of composite and metallic materials
US6370964B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1999 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Nov 23, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/106
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A diagnostic layer having a network of actuators and sensors may be incorporated into or on the surface of composite, metallic, and laminated materials for monitoring the structural health of the material. The diagnostic layer is adapted for detecting and measuring changes in the condition of the material, e.g., the site and extent of damage in the material. In a preferred embodiment, piezoelectric devices are embedded in the diagnostic layer in a network, and serve as actuators and sensors. Signals emitted from the sensors in response to physical deformation, either by an impact or as a result of stress waves generated by the actuators, are diagnostic of the current condition of the diagnostic layer. The diagnostic layer is also adapted to monitor the curing process of a composite material and accurately determine when curing is complete. Methods for monitoring changes in conditions of a material are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.