抄録
A single mode fiber, whose size is 710/1160 μm, was produced to Bragg grating (FBG). The static and dynamic monitoring facilities of the manufactured small-diameter FBG was studied experimentally. Firstly, experiments on strain and temperature sensitivities of the small-diameter FBG were canted out. The FBG was put into a thermostat with the temperature change from 30℃ to 90℃. The results indicated that the central wavelength of the small-diameter FBG was changed with temperature linearly. Then, the FBG was glued on the bottom nuface of a steel beam, which was subjected to four-point bending. Strain calibration showed that the oentral wavelength of the FRG shift linearly with strain_ The experimental value of strain and temperature sensitivity is about 1.16 pm/με. and 10.67 pm/℃ respectively. The maximum experimental error was. near 5%. Secondly, vibration sensing tests of the FBG were carried out. A small-diameter FBG was glued on the surface of an aluminum plate, which vibrated after an oscillator. Acquisition and analysis of the signal results indicated that the designed FBG can be applied in dynamic signal monitoring system.
