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本文研究应用光纤传感技术对环氧树脂固化过程进行实时监测的方法。将光纤的一段包层去掉构成光纤迅衰波折射率传感器，通过测量环氧树脂在固化过程中折射率的变化进行固化监测。由于光纤迅衰波传感器测量的是沿传感区长度方向的平均效果，因而可以在很大的程度上减弱树脂中空隙、杂质等缺陷对测量的影响。通过在光纤传感区一端的光纤端面镀全反射膜形成探针型传感结构，以便于操作。用光时域反射计（ＯＴＤＲ）进行测量，以光纤与光源耦合端面的反射信号作为参考信号对传感信号进行修正，避免了光源光功率的波动和光电探测电路漂移的影响。本文应用射线理论导出光纤固化传感器的理论模型。对Ｅ５１环氧树脂的等温固化过程进行了实时监测实验。
This paper studies the application of optical fiber sensing technology for real-time monitoring epoxy curing process. A section of the optical fiber is removed to form a fiber fast decay index sensor, and the epoxy resin is monitored for curing by measuring the refractive index change during the curing process. As the fiber fast decay sensor measures the average length of the sensing area along the direction of the average effect, which can be to a great extent weaken the resin voids, impurities and other defects on the measurement. The probe-type sensing structure is formed by coating a total reflection film on the end face of the optical fiber at the optical fiber sensing region to facilitate the operation. The optical time domain reflectometer (OTDR) was used to measure the reflected signal of the optical fiber and the light source coupled end face as a reference signal to correct the sensing signal to avoid the fluctuation of the light source power and the influence of the photoelectric detection circuit drift. In this paper, theoretical model of optical fiber curing sensor is derived using ray theory. E51 epoxy curing process isothermal real-time monitoring experiments.