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基于折射率变化的复合材料固化在线监测研究
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先进复合材料的固化成型工艺十分复杂, 目前在很大程度上仍依赖于经验工艺。为了实现复合材料固化工艺的透明化、科学化及智能化, 提出了将光纤折射率传感器用于复合材料制造过程, 研制了一种折射率光纤传感器, 同时将光源、探测器、信号处理器等元器件集成化为一个便携式的光纤传感仪以利于生产现场使用。利用该传感器对常温固化树脂的固化过程进行了测量, 将其与同等条件下迈克尔逊干涉仪对固化过程的监测结果进行了比
较, 二者具有良好的一致性。在实验室与生产现场两种条件下将光纤折射率传感器埋设于预浸料中对其固化工艺过程进行了监测。结果表明, 该技术不仅可以用于新型树脂固化工艺制度的确定, 也可用于复合材料固化工艺过程的在线监测。
关键词: 光纤传感器; 折射率; 复合材料; 固化
Abstract: T ill now the p rocessing of advanced compo site is still emp irical due to its comp licated physical and chem ical change. In o rder to transfo rm the p rocessing technique from an emp irical state to a transparent, scientific and intelligent app roach, the idea of monito ring the cure p rocess of the compo site p roductsw ith fiber op tic sensing technique is put fo rth. A fiber op tic refractive senso r w as developed and a po rtable instrument fo r the op tic em is2 sion, signal receiving and interogation w as integrated to meet the requirement of on2site app lication. W ith it the cure p rocess of resin and fiber reinfo rced p rep regs can be monito red. Tests of resin cure p rocess monito ring are carried out w ith bo th the resin that should be cured under room temperature and the resin that should be cured un2 der h igh temperature. The results of tests w ith resin cure under temperature w ere compared w ith the results of M ichelson interferometer tests under sim ilar circum stances, w h ich are in good consistency. Testsw ere also carried out in compo site manufacture, in w h ich the fiber op tic refractive senso rs w ere embedded in the p rep reg during the cure p rocess. It is p roved that w ith th ismethod the key info rmation of the cure p rocess can be extracted out during
the p rocess and can be used in on2line intelligent contro l. In conclusion, th is technique can be used no t only in the establishment of the cure routine but also in the in2situ monito ring and contro l of the compo site manufacture p ro2 cess.
Key words: f iber op t ic sen so rs; ref ract ive; compo site; cu re
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