A novel two-dimensional (2-D) fiber Bragg grating (FBG) vibration sensor based on an orthogonal flexure hinge structure has been proposed in this paper. The elastic element of this sensor which contains an inertial body, flexure hinge pair and base has been designed in small size and integrally fabricated by using wire cutting. Two FBGs are arranged in the vertical direction by two ends pasted setup to measure the vibration-induced structure displacement. The theoretical and simulation model of the FBG vibration sensor is established. The analysis shows that this structure with a 3 mm length hinge could achieve a high working frequency and low cross-interference. The dynamic characteristics of the sensor have been measured by excitation experiments. The results match the model well that the resonant frequency of the sensor in the X and Y-directions is around 1275 Hz and 1482 Hz, respectively. The third-order natural frequency of 4932 Hz, which indicates that the sensor has high torsional rigidity and strong torsional vibration resistance. The sensor has a broad flat frequency range from 20 to 800 Hz and a sensitivity 41.2/34.5 pm/g in the X/Y-direction. The cross-interference in two directions is less than 6%. The sensor has high frequency and low cross-sensitivity, which is suitable for structural health monitoring of mechanical equipment.

中文翻译：

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一种基于正交弯曲铰链结构的新型光纤布拉格光栅振动传感器

本文提出了一种基于正交弯曲铰链结构的新型二维 (2-D) 光纤布拉格光栅 (FBG) 振动传感器。该传感器的弹性元件包含惯性体、挠性铰链副和底座，采用小尺寸设计，并采用线切割整体制造。通过两端粘贴装置在垂直方向上排列两个FBG，以测量振动引起的结构位移。建立了光纤光栅振动传感器的理论和仿真模型。分析表明，这种具有 3 mm 长度铰链的结构可以实现高工作频率和低交叉干扰。通过激励实验测量了传感器的动态特性。结果与模型很好地匹配，传感器在 X 和 Y 方向的谐振频率分别约为 1275 Hz 和 1482 Hz。三阶固有频率为4932Hz，说明该传感器抗扭刚度高，抗扭振能力强。该传感器具有 20 至 800 Hz 的宽平坦频率范围和 X/Y 方向上的 41.2/34.5 pm/g 灵敏度。两个方向的交叉干扰小于6%。该传感器频率高、交叉灵敏度低，适用于机械设备的结构健康监测。该传感器具有从 20 到 800 Hz 的宽广平坦频率范围和 X/Y 方向上 41.2/34.5 pm/g 的灵敏度。两个方向的交叉干扰小于6%。该传感器频率高、交叉灵敏度低，适用于机械设备的结构健康监测。该传感器具有 20 至 800 Hz 的宽平坦频率范围和 X/Y 方向上的 41.2/34.5 pm/g 灵敏度。两个方向的交叉干扰小于6%。该传感器频率高、交叉灵敏度低，适用于机械设备的结构健康监测。