光纤模斑传感器应用于在线监控复合材料工艺过程

复合材料的固化有着复杂的内部过程, 传统的工艺条件难以保障产品的质量, 发展智能化的在线监控技术是个有效途径, 在线监控系统需要有先进的传感器。研制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反映光纤埋置周围树脂折射率的变化。给出了利用这种传感器进行复合材料固化监测的实验结果。发现这种光纤传感器的信号能反映固化凝胶点、固化结束点及树脂粘度的最低点, 又由于光纤与复合材料的兼容性好以及装置简单、廉价、可靠性高, 因此可以应用于复合材料固化过程的在线监控系统。

INVESTIGATION OF APPLYING FIBER OPTIC SPECKLE SPATIAL SPECTRUM(SSS) SENSOR IN THE INTELLIGENT SYSTEM OF IN TIME MONITORING THE CURING PROCESS OF COMPOSITES

It is difficult to insure the quality of composites for the reason that there are complicated processes during curing process of composites. The intelligent systems of in time monitoring the cure process need advanced sensors though they are effective ways of elevating the quality of composites. In this paper, a new sort of fiber optic sensor was designed, and the variation of refractive index of resin surrounding the embedded fiber optic was observed by measuring the speckle spatial spectrum at the end face of the fiber optic. The resin cure experiment results measured by the fiber optic sensor were given. This sort of fiber optic sensor was found to be able to detect the gel point, the end point and the lowest point of viscosity of resin matrix. This fiber optic sensor system is sensitive to detect the cure process of composite curing in autoclave and can be used in the intelligent system of in time monitoring the curing process of composites for the reason of precision, simplicity and reliability.