Fig. 1. The relationship between ω_P and R，H

Fig. 2. Displacement diagram of diaphragm surface under compression

Fig. 3. The influence of different Δλ on fiber strain

Fig. 4. Schematic diagram of diaphragm-type fiber grating pressure sensor with temperature compensating structure

Fig. 5. FBG pull-off test results

Fig. 6. Temperature test curve

Fig. 7. Temperature response curve

Fig. 8. Stress test curve

Fig. 9. The two-dimensional cross-section temperature change of the pressure sensor （time=50 s）

Fig. 10. Pressure test curve without temperature compensation