一种基于光纤光栅的应力传感器研究

A Stress Sensor Based on Fiber Bragg Grating

通过将光纤光栅固定在悬臂梁的上下表面,提出一种基于光栅的应力传感器,这种传感器首次提出将光栅通过预紧的方式将其两端粘贴在悬臂梁上,可以有效遏制因光栅应变不均而产生的反射峰啁啾变化,同时能提供温度补偿。通过实验证明了这种传感光栅反射峰的波长变化随应力的增加呈良好线性关系。增加了反射峰之间的距离变化,可达0.65nm。同时分辨力也有所提高,达到满量程的1%。

The Fiber Bragg grating is fixed on the upper and lower surface of the cantilever. A kind of stress sensor based on Fiber Bragg grating is proposed. For the first time, the advance tensioning Gratings are pasted on the cantilever beam by both ends. The sensor can effectively curb the chirp of reflecting peak due to the different strain distribution in grating, at the same time can provide temperature compensation. The experiment proves that the fiber Bragg grating sensor reflecting peak wavelength is relative to the stress as good linearity. The distance between two reflect in peaks is increased to 0.65 nm. Resolution is improved at the same time. It is one percent of full scale.