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硅基材料光纤具有比较小的热膨胀系数,可用来制备具有折射率、应变、应力等敏感特性而温度不敏感特性的传感器件,比如利用光纤F-P传感器可实现高灵敏度的应力传感。本文提出了一种基于化学腐蚀法的低成本、高灵敏光纤F-P传感器件,并分析了其应力传感特性。该方法先利用HF溶液制备凹孔端面光纤,然后采用熔融放电方法制备空心结构的光纤FP传感器,有助于增强光纤器件的应力传感特性和温度不敏感能力。实验结果表明,所设计的F-P传感器其应力变化与光纤F-P传感器干涉谱峰变化呈正比关系,其应力灵敏度可以达到5.2,且成本较低廉,具有一定的应用价值。
Silicon-based fiber has a relatively small coefficient of thermal expansion and can be used to prepare sensing devices with temperature-sensitive properties such as refractive index, strain and stress sensitivity. For example, fiber-optic F-P sensors can realize highly sensitive stress sensing. In this paper, a low-cost, highly sensitive optical fiber F-P sensor based on chemical etching is proposed and its stress sensing characteristics are analyzed. The method firstly prepares the concave end face optical fiber by using the HF solution, and then prepares the hollow fiber FP sensor by using a melt discharge method, thereby helping to enhance the stress sensing property and temperature insensitivity of the optical fiber component. The experimental results show that the stress of F-P sensor is proportional to the change of interference peak of F-P sensor, and its stress sensitivity can reach 5.2, and the cost is lower, which has a certain application value.