介绍了一种基于单模光纤侧边粗抛磨增敏技术的光纤曲率传感系统,采用脉冲自参考信号解调技术对增敏区的透过率进行高精度测量。通过悬臂梁曲率测量实验,测定传感器敏感区的线性响应系数是0.593,系统测量噪声幅度为5.9×10 -5,经过悬臂梁位移与曲率换算,可知该系统的曲率分辨率可达9.95×10 -5 m -1。该系统具有结构简单、响应带宽宽和可实现时分复用等优点。

In this study, a fiber curvature sensor was proposed based on a rough side-polished single-mode fiber with a sensitizing technology. In addition, the transmittance of sensitive area in case of the fiber curvature sensor was accurately measured using the pulse self-reference demodulation technique. The experimental results obtained based on the cantilever beam denote the linear response coefficient of the sensor sensitive area is 0.593 and that the noise amplitude in the measurement system is 5.9×10 ^-5. The curvature resolution of the system can become 9.95×10 ^-5 m ^-1 when the cantilever beam displacement is converted to curvature. Furthermore, the curvature sensor has a simple structure and a wide response bandwidth and can be used in a time-division multiplexing system.