Development of an integrated multi-functional fiber-optic sensor and its application to cure monitoring of composites

本研究将光纤布拉格光纤应变传感器和折射率传感器相结合，研制了一种用于监测聚合物成型过程的多功能光纤传感器系统。该系统已应用于玻璃钢生产过程的监控。结果表明，可以定量地测量固化指数和残余应变的产生过程。此外，还可以观察到树脂的软化、树脂流动和空洞的形成。

In the present study, an integrated multi-functional fiber-optic sensor system for monitoring molding process of polymers has been developed by combining FBG strain sensors and refractive-index sensors for monitoring cure index. The system has been applied to process monitoring of FRP. From the results, it is shown that cure index and generation process of residual strain could be measured quantitatively. In addition, it appeared that the softening of resin, resin flow and initiation of voids could be observed.