We demonstrate a fiber Bragg grating (FBG)
pressure sensor based on a spring-diaphragm elastic
structure (SDES) for measuring ultimate pressure.The
ultimate pressure experiment demonstrates a stable linear
relationship between the fiber Bragg grating central wavelength and external pressure in the range of 0-100 MPa, and the
sensitivity of the pressure sensor is 79.7 pm/MPa with a linear correlation coefficient of 0.9998.In addition, the relative
temperature sensitivity coefficients of the FBGs were obtained as KP = 5.99 x 10-6/oC and KT = 6.265 x 10-6/oC
respectively to eliminate the temperature cross-sensitivity effect.