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中文摘要：
针对普通石英光纤质地较脆,应用在结构裂缝监测中易发生断裂的现象,本文运用塑料光纤代替普通石英光纤进行结构裂缝监测,并且考虑复合材料裂缝开裂方向的不确定性,对塑料光纤及其裂缝监测能力进行了研究.设计了一套塑料光纤传感装置,并通过裂缝模拟装置来研究塑料光纤分别与裂缝呈30°、45°、60°夹角时,光损耗与裂缝开度的关系.实验结果表明,随着裂缝的开展,光损耗逐渐增加;纤芯直径为0.5mm时最大光损耗幅值为78.76μW,而纤芯直径为0.25 mm时,最大光损耗幅值只有24.28μW,纤芯直径较大的光纤在微弯时易发生较大的光损耗.塑料光纤传感装置在结构裂缝监测中应用是可行性的,而且塑料光纤裂缝传感器的灵敏性随着方位角的增加而降低.
英文摘要：
Ordinary silica fibers are easy to break in real applications due to their characteristics of brittleness.Plastic optical fibers were proposed to replace silica fibers in crack monitoring.Moreover,considering the uncertainty of crack propagation direction in composite materials,the influence of the angles between plastic optical fibers and cracks was studied.A set of plastic optical fiber sensing device was designed and the relationship between optical loss and crack width under different fiber/crack angles was measured through the device.The results show that the optical loss in plastic optical fibers increased gradually with crack propagation.Therefore,applying plastic optical fibers in crack monitoring is feasible and the sensitivity of plastic optical fiber crack sensors decreases with the increasing of fiber/crack angles.Moreover,from the experimental results,the maximum optical loss of 0.5mm plastic optical fibers is 78.76μW,while the maximum optical loss of 0.25 mm plastic optical fibers is only 24.28μW.Therefore,the fibers with bigger diameter have more bend loss when they are bent.
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