novel MFBG pressure sensor based on the thin-wall strain cylinderwith temperature compensation

摘要

A novel metal-coated fiber Bragg grating (MFBG) pressure sensor based on the thin-wall strain cylinder withtemperature compensation was designed and fabricated. According to the elastic strain principle, the theoretical analysisof the strain distribution of this structure was described by calculation and simulation software Ansys. A sensingMFBG1 was soldered on the tangential direction on the exterior surface of the thin-wall strain cylinder, and anotherMFBG2 was soldered on the axial direction to compensate the effect of temperature. The experimental results indicatedthat the cross-sensitivity of pressure and temperature of this sensor can be self-compensated well by this method. Inaddition, the actual measurement pressure range from 0 to 42 MPa with a high pressure sensitivity coefficient of 0.0496nm/MPa. Simultaneously, the measure range of pressure can be adjusted by changing the structure material and thegeometry size of the sensor. This kind of sensor has potential applications in the sensing measurement at harshenvironment.