布拉格光栅植入角度对在复合材料中传感检测特性影响

Study on Sensing Characteristics of Different Embedding Angles of Bragg Gratings in Composites

植入到复合材料内部的布拉格光栅可用于监测复合材料内部应力应变及温度变化,但是现有研究里对于光栅植入过程中对光栅传感检测特性造成的影响却未见报道。在植入过程中,植入光栅与碳纤维存在的夹角将会产生内应力,这会对光栅传感检测效果产生影响。为了研究其影响规律,通过将光栅植入到准各向同性复合材料的不同层中,研究光纤与相邻预浸带中碳纤维之间的夹角对温度与应力检测特性影响。研究结果表明:光栅植入角度会对其温度和应变传感检测特性造成较大影响,当光栅与相邻预浸带碳纤维存在夹角时,光栅拉伸应变测量值与应变片测量值出现偏差,发生啁啾现象;同时光栅与相邻预浸带碳纤维的夹角越大,光栅温度检测曲线线性拟合度越差。

Fiber Bragg grating （FBG） is proposed to embed in the composites to monitor the variation of strains and temperature, however, the influence of embedment on the sensing performance is not clear in the current studies. In the process of embedment, the angle between OF （optical fiber） and carbon fiber in the adjacent prepreg will generate the internal stress, which affect the sensing performance. For the sake of the investigation on this influence, the composites embedded the vary- ing angle of OF is prepared and tested under the variation of strains and temperature to observe the influence on the sensing. Obtained results indicated that the angle of OF will affect the sensing performance inculding strains and temperature. In the inspection under the temperature, the degree of fitting for the sensing curve decreases with the increasing angle. Also, the de- viation of the data measured by OF and strain gauge increases with the angle, implying a bigger deviation.