中文摘要：

介绍了一种新型的基于光纤布拉格光栅的温度不敏感的振动传感器。将光纤光栅倾斜粘贴在直角三角形悬臂梁的侧面,沿垂直方向的振动将导致悬臂梁沿长度方向的曲率周期性变化。悬臂梁弯曲使光纤布拉格光栅带宽展宽,其反射带宽和反射光强随着自由端挠度的变化而改变。在振动测量过程中,以传统的电阻应变片的测量结果作为此光纤光栅振动传感器的参照对比,两者所测得的振动频率相差小于0.5%。此外,由于光纤布拉格光栅的反射带宽和反射光强不随温度改变,所以此振动传感器具有温度不敏感性。

英文摘要：

A novel temperature-insensitive vibration sensor based on a fiber Bragg grating（FBG） was proposed and experimentally demonstrated.The FBG was glued in a slanted direction onto the lateral side of a right-angled triangle cantilever beam.Vertical vibration applied to the cantilever beam leads to a periodical variation of bending curvature along the beam length.As a result of beam bending,the FBG was chirped and its reflection bandwidth and optical power changed with the deflection of the beam.Experimental results were compared with the data of vibration measurement of a conventional resistance strain gauge.The difference between the measured vibration frequencies of two sensors was less than 0.5%,indicating that a good agreement was achieved in the experiment.Furthermore,this sensor is temperature-insensitive due to the temperature-independence nature of the reflection bandwidth and optical power of the FBG.Thus,the proposed vibration sensor will have well prospect of applications in harsh electromagnetic interference and rapid changing temperature environment.