CAJ | 학술논문

根据土压力传感器与土介质的匹配原则，设计了一种圆平膜片薄板挠曲型FBG土压力传感器。通过在圆膜片上设计一组对称的光栅固定柱，有效避免了传感器在使用过程中产生谱峰分裂。同时，利用光栅固定柱张角引起的应变效应，大幅度地提高了传感器的压力灵敏度。理论分析了该结构的增敏机理并给出传感器灵敏度公式，计算结果表明，传感器的压力灵敏度可达1374．3 pm／M Pa。使用ANSYS建立薄板挠曲的有限元模型，通过提取固定柱中心点处在光纤方向上的位移，获得了有限元模型的压力灵敏度为1360．8 pm／M Pa。有限元分析和理论设计结果的相对误差为0．98％，具有很高的一致度，验证了理论设计和分析的正确性。
근거토압력전감기여토개질적필배원칙，설계료일충원평막편박판뇨곡형FBG토압력전감기。통과재원막편상설계일조대칭적광책고정주，유효피면료전감기재사용과정중산생보봉분렬。동시，이용광책고정주장각인기적응변효응，대폭도지제고료전감기적압력령민도。이론분석료해결구적증민궤리병급출전감기령민도공식，계산결과표명，전감기적압력령민도가체1374．3 pm／M Pa。사용ANSYS건립박판뇨곡적유한원모형，통과제취고정주중심점처재광섬방향상적위이，획득료유한원모형적압력령민도위1360．8 pm／M Pa。유한원분석화이론설계결과적상대오차위0．98％，구유흔고적일치도，험증료이론설계화분석적정학성。
Based on the matching principle of soil medium and pressure transducer ,a circular flat diaphragm with flexure of sheet structure fiber Bragg grating (FBG) soil pressure sensor was designed .By designing two symmetric fix ends on the diaphragm ,we could successfully solve the problem that the reflection spectra of the FBG subject to the transverse force split in two main peaks .As the same time ,for the strain effect caused by the fix ends'flare angle ,the sensor's pressure sensitivity was enhanced dramatically .By analyzing the sensor's enhance‐ment effect theoretically ,we got the sensor's pressure sensitivity formula .Computed result showed the sensor's pressure sensitivity was 1374 .3 pm/MPa .ANSYS was used to establish the finite element model for the flexure of sheet structure .By extracting the displacement of fix ends'coordinate point on the fiber's direction ,we got the finite element model's pressure sensitivity about 1360 .8 pm/MPa .ANSYS analysis result has high entropy with theoretical analysis'conclusion and the relative error is 0 .98% ,w hich verifies theory design and analysis .