Based on the optimal design for the thin wall cylinder for closing the FBG sensor at 0～50 MPa pressure range,the better sensor performance is obtained by changing the sizes of the cylinder materials and structures.The sensor is manufactured,and the high-pressure experiments are performed at the range from 0 to 50 MPa.The experimental results show that the pressure sensitivity of FBG is about 0.037 4 nm/MPa,and there are very good linearity and repeatability between the center wavelength of FBG a...