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针对普通石英光纤断裂应变较小在实际工程应用中易发生断裂的问题,本文提出在结构裂缝监测工作中运用塑料光纤(POF)代替普通石英光纤,设计了由光源、POF及光功率计组成的塑料光纤裂缝传感装置,并通过裂缝模拟装置对纤芯直径分别为0.25mm及0.5mm的POF在裂缝监测中应用的可行性进行了验证。实验结果表明,裂缝开度为0到6mm范围内,两种型号POF内部光的强度随裂缝扩展呈现逐渐减弱的变化,裂缝开展初期光强度变化明显,当裂缝宽度趋近于6mm时变化逐渐减弱,符合理论规律,且光纤直径较大时光强度变化更明显。因此POF可以有效感知裂缝的扩展,且光纤直径较大时对裂缝感知更敏感,将其应用在结构裂缝监测工作中是可行性的。
Aiming at the problem that the fracture strain of common quartz fiber is easy to break in practical engineering application, this paper proposes to use plastic optical fiber (POF) instead of ordinary quartz fiber in structural crack monitoring and design a light source, POF and optical power meter Plastic optical fiber crack sensing device. The feasibility of applying POF with the core diameter of 0.25mm and 0.5mm respectively to crack monitoring was verified by the crack simulation device. The experimental results show that the intensity of the internal light of two POFs shows a gradual decrease with the crack propagation in the range of 0-6mm, and the light intensity changes obviously at the beginning of the crack initiation. The change gradually decreases when the crack width approaches 6mm , In line with the law of theory, and the larger the diameter of the optical fiber when the intensity of change is more pronounced. Therefore, POF can effectively sense the propagation of cracks, and it is more sensitive to the cracks when the fiber diameter is larger. It is feasible to use POF in structural cracks monitoring.