| 双膜式光纤Bragg光栅土压力传感器的研究 |
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| 引用本文： | 陈富云,李 川,陈尔阔,熊 新,李英娜.双膜式光纤Bragg光栅土压力传感器的研究[J].岩土力学,2013,34(11):3340-3344. |
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| 作者姓名： | 陈富云 李 川 陈尔阔 熊 新 李英娜 |
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| 作者单位： | 昆明理工大学 信息工程与自动化学院，昆明 650500 |
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| 基金项目： | 省应用基础研究计划项目(No. 2013FZ021) |
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| 摘 要： | 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。
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| 关 键 词： | 光纤Bragg光栅 传压油腔 双膜式 土压力 波长移位 |
| 收稿时间： | 2012-12-18 |
Dual-diaphragm fiber Bragg grating soil pressure sensor |
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| CHEN Fu-yun,LI Chuan,CHEN Er-kuo,XIONG Xin,LI Ying-na.Dual-diaphragm fiber Bragg grating soil pressure sensor[J].Rock and Soil Mechanics,2013,34(11):3340-3344. |
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| Authors: | CHEN Fu-yun LI Chuan CHEN Er-kuo XIONG Xin LI Ying-na |
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| Institution: | Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China |
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| Abstract: | 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. |
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| Keywords: | fiber Bragg grating transmitting pressure oil chamber dual-diaphragm soil pressure wavelength shift |
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