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设计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监测光纤埋置周围树脂折射率的变化。计算了随着树脂固化过程中折射率变化的功率谱密度分布，给出了截止频率与折射率的近似关系以及利用这种传感器进行复合材料树脂固化监测的实验结果。发现这种光纤传感器的信号可以用来反映固化凝胶点和固化结束点。由于固化后光纤仍保持光波导特性，该光纤还可以用来监测结构受环境的扰动如温度变化、振动等。
A new type of optical fiber sensor was designed. The change of refractive index of resin around the embedded optical fiber was monitored by measuring the near-field mode of the optical fiber. The approximate relationship between the cutoff frequency and the refractive index and the experimental results of using this sensor to monitor the curing of the composite resin were calculated with the distribution of the power spectral density as the refractive index changes during curing. The signal from this fiber optic sensor was found to reflect the cure gel point and the cure end point. Since the optical fiber after curing still retains the optical waveguide characteristics, the optical fiber can also be used to monitor the structure of the environment by the disturbance such as temperature changes, vibration and so on.