Abstract: We design a new high sensitive fiber grating gas pressure sensor with temperature compensation based on a thinwalled cylinder structure to improve the precision and accuracy of gas pressure sensing. We determine its structure and size through theory analysis. It has a thinwalled cylinder structure with inner diameter of 15 mm, wall thickness of 0.13 mm and 30CrMnSiA as material. Its sensitivity is 220 pm/MPa.The drift amount of its fiber grating central wavelength is 2.93 nm when gas pressure is 10 MPa.It has error of less than 0.05 MPa and better reproducibility.Practical application shows that it has higher accuracy and can overcome the impact of temperature on measurement results.

Key words: thinwalled cylinder structure, optical fiber sensing, excavation roadway, gas pressure