基于偏芯结构的光纤传感器的振动传感特性研究

提出了一种基于偏芯熔接结构的光纤振动传感器，该传感器具有较好的梳状滤波特性和较高的消光比。通过对该结构的传感器的弯曲响应特性进行分析，实验结果表明该传感器对弯曲变化表现出了近似线性响应的特性。在此基础上进一步研究了传感器的振动响应特性，对传感器工作在线性响应区域和非线性响应区域的振动响应特性进行了分析和对比。实验结果表明，该传感器在线性工作区域表现出了极好的振动响应特性，其振动响应谱线与马赫曾德尔型光纤干涉仪相类似。此外，该传感器在无振动情况下的噪声极低，具有较好的实际应用价值。

Abstract

An optical fiber vibration sensor based on a core-offset structure is proposed and demonstrated. This kind of fiber sensor shows a nice comb filter property and has a high extinction ratio. The curvature sensing characteristic of the core-offset structure is analyzed. The experiment results show that this kind of sensor exhibits a linear response to bending curvature. The vibration characteristic of the sensor is studied at this basic. And the vibration responses of the sensor with the input laser wavelengths located in the linear responding area and in the transmission peaks or dips are analyzed. The results show that this kind of vibration sensor exhibits a fine vibration response with the input laser wavelength located in the linear responding area, just like Mach-Zehnder fiber interferometer. In addition, the sensor shows a nice noise characteristic when there is no vibration, which means good application prospects.

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基于偏芯结构的光纤传感器的振动传感特性研究

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