柚子型微结构光纤Bragg光栅温度和应变传感特性研究

通过对柚子型微结构光纤Bragg光栅的多个反射峰的温度和应变传感特性进行的理论和实验 研究，得出柚子型微结构光纤Bragg光栅的反射波长与温度呈二次关系，且理论和实验二者 吻合较好; 同时发现每个反射峰的温度灵敏度不同.理论分析柚子型微结构光纤Bragg光栅的 反射波长与应变呈线性关系，实验得到了该种Bragg光栅的反射波长与应变的线性关系，实 验结果与理论分析相吻合.由于微结构光纤光栅反射谱中多个峰对温度和应变等物理量敏感 度不一致，这种Bragg光栅更适合应用到多参量传感领域. 关键词： 微结构光纤 光纤Bragg光栅 温度传感 应变传感

Temperature and strain sensing property of grapefruit microstructure fiber Bragg grating

The temperature and strain sensing property of a grapefruit microstructure fiber (MF) Bragg grating with multi-reflection peaks have been studied. Analysis indicates that the wavelength shift of this grating changes quadratically with the environmental temperature. Experimental results show that different reflection p eaks have their individual temperature sensitivities. Furthermore, the relations hip between the wavelength shifts and temperature variation has been fitted, whi ch confirms the above analysis. However, theoretical analysis indicates that the wavelength shift have a good linear relationship with the strain change. The re lationship between the wavelength shift and strain changes has been fitted throu gh experiment. The inconsistent sensitivity of different reflection peaks for th is grating ensures its practical applications in the field of multi-parameter se nsing measurement.