Abstract: A high-pressure resistant fiber Bragg grating(FBG) pressure sensor using a metallic elastic cylinder as the substrate is designed, the properties of the said sensor are tested in the temperature range of 16~60℃ and the pressure range of 0~52MPa, and its performance parameters and the temperature revise factor are calculated. Results show that the performance of the said sensor is stable, with its repeatability being good, the tuning range of linearity being 4.066nm, the pressure sensitivity being 0.0782nm/MPa, and the wavelength resolving capability for pressure demodulation being 1.56pm. After the temperature is revised, the opposite error margin of the pressure measure is reduced from 5.2% to 0.25%. Double sealing design has been adopted, thus avoiding fluid or gas leakage. By selecting the materials of different elastic moduli, the inner diameter and thickness, the measuring range and sensitivity of the said sensor can be adjusted.

Key words: fiber optics, in-fiber Bragg grating sensing, pressure-sensing-characteristics, sensitivity of the sensor