| Popis: |
In this paper, to investigate a method improving high temperature response characteristics, the high temperature sensing properties of fiber Bragg gratings packaged by the red copper and cuprum and aluminum respectively were studied. The results indicate that the response characteristics of FBG have very good linearity, and the linearity of FBG packaged by aluminum is best, but its response time is slower because of lower heat conductivity of packing material, and that higher thermal expansion coefficient of packaging base material can effectively reduce the nonlinearity of FBG sensor in high temperature environment. At last, a method improving the temperature sensitivity of FBG sensor and reducing FBG's nonlinear response versus temperature was presented, and packaging material is selected according to response time versus temperature change. |
