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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。
A novel temperature insensitive vibration sensor based on fiber Bragg grating is introduced. Pitch the FBG to the side of a right triangle cantilever. Vibration in the vertical direction will cause the curvature of the cantilever to change periodically in the length direction. Cantilever beam bending broaden the fiber Bragg grating bandwidth, the reflection bandwidth and reflected light intensity with the free end of the deflection changes. In the vibration measurement process, taking the traditional resistance strain gage measurement results as the reference of the FBG vibration sensor, the vibration frequencies measured by the two are less than 0.5%. In addition, the vibration sensor is temperature-insensitive due to the fact that the reflection bandwidth and the intensity of the reflected light of the fiber Bragg grating do not change with temperature.