基于菱形敏化结构的膜片式FBG土压力传感器OA

To address the accuracy degradation of traditional earth pressure sensors caused by temperature and electromagnetic interference in long-term monitoring,a diaphragm-type fiber Bragg grating(FBG)earth pressure sensor based on a rhombic sensitized structure is designed.The sensor uses a circular diaphragm for pressure sensing,transmits pressure through the rhom-bic structure,and employs two FBGs in series on the strain beam and temperature compensation beam to achieve pressure mea-surement and temperature compensation.The design is validated by theoretical analysis and Ansys finite element simulation,followed by experimental testing.Results show good linearity from 0 to 2 MPa with a sensitivity of 981.87 pm/MPa,effective temperature compensation from-10 ℃ to 50 ℃,and wavelength fluctuation within±5 pm during a 3-hour creep test,meeting the requirements for long-term accurate earth pressure monitoring.