摘要
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 sort of fiber optic sensor is designed, which measures the variation of refractive index of the resin surrounding the embedded fiber optic by measuring the speckle spatial spectrum at the end face of the fiber optic. The normalized speckle spatial spectrum which depends upon the variation of the refractive index through the resin cure process is calculated, and the approximate relation between refractive index and cutoff frequency is given. The resin cure experiment results measured by the fiber optic sensor are presented. This sort of fiber optic sensor is found to be able to detect the gel point and the end point of the cure process. For the fiber optic maintains wave guide performance after cure sensing, it was pointed that this sensor could also be used to sense the factors such as temperature and vibration which perturb the structures.
出处
《高技术通讯》
EI
CAS
CSCD
1998年第10期35-39,共5页
Chinese High Technology Letters
