CAJ | 학술논문

采用双膜油腔结构研制了一种双膜式光纤Bragg光栅土压力传感器，偏压试验表明，此土压力传感器有效改善了与土压力传感器接触部分土压力分布不均的问题。在土压力的作用下，一次膜片变形产生的压力经传压油传递给二次膜片，传压杆与等强度悬臂梁刚性连接，二次膜片中心发生的挠度变化推动传压杆，使等强度悬臂梁的自由端发生同样大小的挠度变化。通过检测粘贴于等强度悬臂梁表面中心轴线上的光纤Bragg光栅的波长移位可获得土压力。载荷试验表明，传感器的灵敏度为412.7 pm/MPa，非线性误差为1.97%FS，重复性误差为3.68%FS。
채용쌍막유강결구연제료일충쌍막식광섬Bragg광책토압력전감기，편압시험표명，차토압력전감기유효개선료여토압력전감기접촉부분토압력분포불균적문제。재토압력적작용하，일차막편변형산생적압력경전압유전체급이차막편，전압간여등강도현비량강성련접，이차막편중심발생적뇨도변화추동전압간，사등강도현비량적자유단발생동양대소적뇨도변화。통과검측점첩우등강도현비량표면중심축선상적광섬Bragg광책적파장이위가획득토압력。재하시험표명，전감기적령민도위412.7 pm/MPa，비선성오차위1.97%FS，중복성오차위3.68%FS。
A dual-mode fiber Bragg grating soil pressure sensor is invented on the basis of dual membrane oil cavity structure. Biasing pressure experiments are done with this kind of soil pressure sensor. The results show that the sensor can effectively distribute the soil pressure between the sensor and its contacting segment evenly. Under soil pressure, the first diaphragm deflection passes the pressure on to the second diaphragm via transferring pressure oil. The transfer lever and the equal strength cantilever are rigidly connected. The central deflection of the second diaphragm pushes the transfer lever timely, which exerts a equal size defection on the free end of the equal strength cantilever. Then soil pressure could be obtained by the wavelength shift of fiber Bragg grating, which is pasted on the surface central axis of equal strength cantilever. The loading experiment indicates that the sensitivity of dual-mode optical fiber Bragg grating soil pressure sensor is 412.7 pm/MPa;the nonlinearity error is 1.97%FS;and the repeatability error is 3.68%FS.