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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >A Fiber Bragg-Grating-Based Miniature Sensor for the Fast Detection of Soil Moisture Profiles in Highway Slopes and Subgrades
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A Fiber Bragg-Grating-Based Miniature Sensor for the Fast Detection of Soil Moisture Profiles in Highway Slopes and Subgrades

机译：基于光纤光栅的微型传感器用于快速检测公路边坡和路基的土壤水分状况

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摘要

A fiber Bragg grating (FBG)-based aluminum oxide tube packed sensor (ATPS) was developed for the fast detection of the soil moisture profile in highway slopes and subgrades. The novel ATPS consists of an aluminum oxide tube with a diameter of 5 mm, an optical fiber containing a quasi-distributed FBG sensors, a “U”-shaped resistance wire, and a flange. There are four 0.9-mm diameter holes in the ATPS. Laboratory experiments were carried out to calibrate the relationship between the thermal response of ATPS and the soil moisture content. Two laboratory rainfall validation model tests were performed to validate the ATPS for capturing the soil moisture profile in highway slopes and subgrades. During the validations, the accuracy of the ATPS was quantified, and water infiltration through grassy and grassless ground surfaces were investigated. The calibrations indicate that the ATPS can detect and record real-time changes in the highway slope and subgrade moisture after rainfall, and reveal the most dangerous zones that occur at the connection between different construction materials. The average measurement accuracy of soil moisture monitoring was 0.015 m3/m3. Please note that the connection is where cracks form easily and the soil hydraulic conductivity increases significantly. The test results also indicate that grassy cover (lawn) significantly prevents water infiltration during the first few minutes of rainfall (twelve minutes in this study), after which, however, the infiltration rate drops sharply. The influence of lawn on water infiltration depends on the soil structure, hydraulic conductivity, and rainfall time. In summary, due to its small size and fast detection, the ATPS is a portable probe that can be used for moisture monitoring in highway slopes and subgrades.
机译：开发了一种基于光纤布拉格光栅（FBG）的氧化铝管填充传感器（ATPS），用于快速检测公路边坡和路基的土壤水分状况。新型ATPS由直径为5 mm的氧化铝管，包含准分布FBG传感器的光纤，“ U”形电阻丝和法兰组成。 ATPS中有四个直径为0.9毫米的孔。进行了实验室实验以校准ATPS的热响应与土壤水分之间的关​​系。进行了两个实验室降雨验证模型测试，以验证ATPS可以捕获高速公路斜坡和路基的土壤水分状况。在验证过程中，对ATPS的准确性进行了量化，并研究了通过草皮和无草皮地面渗入水的情况。校准表明，ATPS可以检测并记录高速公路坡度和降雨后路基水分的实时变化，并揭示在不同建筑材料之间的连接处出现的最危险区域。土壤水分监测的平均测量精度为0.015 m 3 / m 3 。请注意，连接处容易形成裂缝，土壤水力传导率显着增加。测试结果还表明，草皮（草坪）在降雨的前几分钟（本研究中为十二分钟）显着阻止了水的渗透，但是此后渗透率急剧下降。草坪对水分入渗的影响取决于土壤结构，水力传导率和降雨时间。总之，由于ATPS体积小，检测速度快，是一种便携式探头，可用于高速公路斜坡和路基的湿度监测。

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