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光纤加速度传感器凭借其优势,近年来受到越来越多的关注。在梁式传感器的基础上,提出了一种基于双端固定梁的光纤传感器,其利用细径高数值孔径单模细光纤盘贴在梁上,形成传感光纤。分析了单模光纤最小的弯曲半径,从而可以在不带来弯曲损耗的前提下,尽可能多地盘贴光纤于梁臂上,提高其灵敏度。同时因为其双端固定的结构,极大地降低了其横向灵敏度,有利于制作三维传感器。理论上分析了该结构的传感器的共振频率,同时对其灵敏度进行了分析。设计了传感器测试装置,实验验证了传感器的响应线性,并对传感器的共振频率进行了标定。提出的传感器固有频率在360 Hz,在100 Hz处灵敏度值高达3300 rad/g,可以有效地用于低频加速度的检测。
Optical fiber acceleration sensor by virtue of its advantages in recent years by more and more attention. Based on the beam sensor, an optical fiber sensor based on double-ended fixed beam is proposed, which uses thin-diameter, high-numerical-aperture, single-mode thin optical fiber disk attached to the beam to form the sensing fiber. The minimum bending radius of the single mode fiber is analyzed, so as to increase the sensitivity of the optical fiber on the beam arm as much as possible without bending loss. At the same time because of its double-ended fixed structure, which greatly reduces the lateral sensitivity, is conducive to the production of three-dimensional sensors. The resonant frequency of the sensor is theoretically analyzed, and the sensitivity of the sensor is analyzed. The sensor test device is designed. The response of the sensor is experimentally verified and the resonant frequency of the sensor is calibrated. The proposed sensor has a natural frequency of 360 Hz and a sensitivity of 3300 rad / g at 100 Hz, which can effectively be used to detect low-frequency acceleration.