Multiplexed optical fibre sensors were embedded into a carbon-fibre-reinforced-preform during the industrial production of a full-sized, one-piece tail cone assembly for a regional jet aircraft. Optical fibre Fresnel sensors monitored both the infusion of the resin, via measurement of the refractive index-dependent attenuation in the reflected light signal, and the degree of cure of the resin, via measurement of the chemical cure reaction-dependent change in refractive index. The resin cure was also monitored by optical fibre Bragg gratings (FBGs) fabricated in high linearly birefringent optical fibre, which measured through-thickness strain development, while FBGs in standard single mode optical fibre measured longitudinal strain development. The magnitudes and profiles of the transverse and longitudinal strains developed during the curing process were consistent across different locations on the tail cone. Typical transverse and longitudinal strains, related to cure reaction-i...

中文翻译：

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使用嵌入式光纤传感器的全尺寸碳纤维复合材料飞机尾锥组件的生产过程监控和生产后应变测量

在用于支线喷气飞机的全尺寸单件式尾锥组件的工业化生产过程中，将多路复用的光纤传感器嵌入到碳纤维增强的预型件中。光纤菲涅耳传感器既可以通过测量反射光信号中与折射率有关的衰减来监控树脂的注入，也可以通过测量与化学固化反应有关的折射率变化来监控树脂的固化程度。还通过在高线性双折射光纤中制造的光纤布拉格光栅（FBG）监测树脂固化，该光栅测量了整个厚度的应变发展，而在标准单模光纤中的FBG则测量了纵向应变的发展。在固化过程中产生的横向和纵向应变的大小和轮廓在尾锥上的不同位置都一致。典型的横向和纵向应变，与固化反应有关。