[摘要]：A novel temperature-insensitive displacement sensor based on a fiber Bragg grating (FBG) is presented. A FBG was glued into a V-shaped groove, which lies on the lower surface of a double trapezoidal beam. It is found that the 3-dB bandwidth of the reflection spectra and output optical power of the FBG changed linearly with the variation of the displacement of the beam. High sensitivity of 0.25 nm mm(-1) and 3.70 mW mm(-1) were achieved. The sensor is temperature-insensitive through measuring the bandwidths of the reflection spectra and optical power of the reflected signal.
