In order to improve pressure sensitivity of fiber Bragg grating（ FBG） sensor so that it can be used in oil and gas under the shaft high-pressure sensing measurement requirement

a high-pressure resistance FBG sensor based on thin-wall elastic cylinder with protective sleeve is designed. Along the axial direction of the elastic cylinder

FBG is sticked to the inner surface by high-temperature glue. Because the change of oil pressure outside the elastic cylinder results in axial compression and the strain is transmitted to FBG

and causes wavelength change of FBG

so ambient pressure change can be measured by testing wavelength change of FBG. The pressure sensitivity by theoretical calculation is- 0. 035 nm / MPa

in pressure rang

e of 0

40 MPa

pressure response sensitivity is- 0. 033 9 nm / MPa

linear degree is 0. 999 7

the theoretical calculation results are consistent with experimental results. Results reveal that performance of the sensor is stable

linearity and repeatability are good

this kind of pressure sensor can be used in real-time high-pressure measurement of oil and gas under the shaft.