基于相移布喇格光纤光栅的折射率传感实验研究

利用图解法求解光纤特征方程,获得腐蚀过程和传感过程中光纤光栅的光谱特性,设计了光纤光栅的部分腐蚀方案,采用氢氟酸溶液腐蚀制作相移布喇格光纤光栅。对光纤光栅进行部分腐蚀,将形成相移光纤光栅。根据相移光纤光栅的特性,讨论了利用反射光光强解调的方式,该方式具有结构简单且对温度不敏感的优点。

Etched Phase Shift Fiber Bragg Grating Based Refractive Index Sensing

A fiber Bragg grating etched by HF solution is applied for refractive index sensing. The dispersion relation equation of fiber is numerically resolved. The reflected spectrum of the fiber grating during etching and sensing is theoretically obtained. The result is applied to design an optimum etching process, and a phase shift fiber Bragg grating is fabricated and applied to measure refractive index of surround solution. The fiber Bragg grating is partial and localized etched to be a phase shift fiber Bragg grating. According to the character of phase shift fiber Bragg grating, a modulation method based on reflected power is developed, the modulation system is convenient and immune to temperature change.