多模光纤传感器复合材料固化实时监测研究

设计了一种新型光纤传感器，提出通过测量光纤末端近场模斑谱监测光纤埋置周转树脂折射率的变化。

Study of Composite Cure Real Time Sensing Using Fiber Optic Sensor

A new sort of fiber optic sensor is designed, which measures the variation of refractive index of the resin surrounding the embedded fiber optic by measuring the speckle spatial spectrum at the end face of the fiber optic. The normalized speckle spatial spectrum which depends upon the variation of the refractive index through the resin cure process is calculated, and the approximate relation between refractive index and cutoff frequency is given. The resin cure experiment results measured by the fiber optic sensor are presented. This sort of fiber optic sensor is found to be able to detect the gel point and the end point of the cure process. For the fiber optic maintains wave guide performance after cure sensing, it was pointed that this sensor could also be used to sense the factors such as temperature and vibration which perturb the structures.