Pro ceeding from analyzing unstable phenomenon of the planar diaphragm structure of the pressure sensor in the rapid temperature changing field, the author broke free from conventional designing methods and adopted novel spherical shell sha ped diaphragm structure to overcome the unstable phenomenon.

A novel temperature-insensitive pressure sensor based on fiber Bragg grating(FBG) broadened bandwidth technique using a plane round metal diaphragm is studied theoretically and experimentally.

Finite element method was applied to analysis the expansion and the last corresponding degrees of thermal expansion of silicone oil was achieved under two different shapes of tablets,which were flat tablets and wavy tablets.

The principles of a fiber Bragg grating sensor are presented and the theory of deformation of the flat diaphragm under pressure is described in detail.

The pressure sensor characteristic of fiber Bragg grating is analyzed,the high-pressure experiments about compression and decompression are carried out on the self-designing diaphragm,whose type is ZXYCO1,which fiber Bragg grating is stuck with the longitudinal and transverse methods.

Elastic characteristic analysis and optimization design on circular flat diaphragm