Method for quantification of impregnation of fibrous preform with injected resin to form composite part in e.g. aerospace industry, involves measuring saturation speed of preform based on flight time, signal amplitude and preform thickness

摘要

The method involves gradually saturating a fibrous preform (13) by impregnation fluid i.e. silicone oil, and emitting and receiving an ultrasound signal by ultrasound sensors (21-23). Flight time of the ultrasound signal corresponding to a time required to the signal is measured for traversing to and return of the signal in a section (33) of the fibrous perform. A saturation speed of the fibrous preform is estimated according to the flight time, amplitude of the emitted ultrasound signal, amplitude of the received ultrasound signal and a thickness of the preform. An independent claim is also included for a device for determining a fiber level of a fibrous perform.