基于C形弹性管的光纤光栅压力位移传感测量

Measurement of pressure and displacement by using the optical fiber grating sensor based on the C-shaped elastic tube

设计了一种基于C形弹性管的光纤布喇格光栅传感结构.用管内过剩压力使弹性管的自由端产生位移和管表面产生的应力对光纤布喇格光栅反射波长进行调谐.得到了光纤布喇格光栅反射波长变化对应于压力和自由端位移的线性关系.在0～6MPa的压力范围内,光纤布喇格光栅反射波长随压力和位移均呈线性变化且压力和位移的传感灵敏度分别达到0 0305nm/MPa和0.0359nm/mm,线性调谐范围分别为0 183nm和0 215nm,波长分辨率分别为3 05pm和0 718pm.

The structure design of a fiber Bragg grating (FBG) sensor based on the C-shaped elastic tube has been put forward. The tuning of the FBG reflected wave length is carried out by using the excess pressure in the elastic tube for making the free end of the said tube produce displacement, or making the surface of the said tube produce stress. The linear relationship of FBG reflected wavelength variation against both the pressure and the free end displacement has been obtained. In a pressure range of 1-6 MPa, the relationship between FBG reflected wave length and pressure or displacement is a linear characteristic, with the sensitivity of the pressure and displacement sensor reaching 0.0305 nm/MPa and 0.0359 nm/mm respectively, with the linear tuning range being 0.183 nm and 0.215 nm respectively, and with the wave length resolving capability being 3.05 pm and 0.718 pm respectively.