초록 ▼

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 ma

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.

대표청구항 ▼

1. A diagnostic layer for detecting a structural condition of a material, said diagnostic layer comprising:a thin and flexible dielectric substrate having embedded therein: a network of actuators/sensors spatially distributed such that at least two actuators/sensors detect a propagating stress wave

1. A diagnostic layer for detecting a structural condition of a material, said diagnostic layer comprising:a thin and flexible dielectric substrate having embedded therein: a network of actuators/sensors spatially distributed such that at least two actuators/sensors detect a propagating stress wave generated by at least one other actuators/sensors, wherein said actuators/sensors capable of generating electrical signals representative of a structural condition of said material; a plurality of conductive elements electrically interconnecting said actuators/sensors; and an output lead electrically connected to said conductive elements.