| 金庆鹏,刘璐,吕侃骏,孔明,牟赛杰.水泥混凝土含水率传感器设计与应用[J].电子测量与仪器学报,2024,38(6):225-232 |
| 水泥混凝土含水率传感器设计与应用 |
| Design and application of cement concrete moisture content sensor |
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| DOI： |
| 中文关键词: 圆柱式传感器 COMSOL 边缘电场 水泥混凝土 |
| 英文关键词:cylindrical sensor COMSOL edge electric field cement concrete |
| 基金项目: |
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| Author | Institution |
| Jin Qingpeng | China Jiliang University, Hangzhou 310018,China |
| Liu Lu | China Jiliang University, Hangzhou 310018,China |
| Lyu Kanjun | China Jiliang University, Hangzhou 310018,China |
| Kong Ming | China Jiliang University, Hangzhou 310018,China |
| Mou Saijie | Taizhou Huangyan District Institute of Metrology and Product Quality and Safety Testing, Taizhou 318020,China |
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| 摘要点击次数: 41 |
| 全文下载次数: 1299 |
| 中文摘要: |
| 水泥混凝土是一种被广泛应用于工程建设中的复合材料，它的凝结状态对工程进度与安全至关重要,研究发现水泥混凝土的凝结时间与含水率有关。因此,为测量水泥混凝土含水率设计了基于电容检测原理的含水率测量传感器。根据水泥混凝土的介电特性和电容式传感器的检测原理, 并利用边缘电场增大测量范围,设计了平行板式及圆柱式的电容式边缘电场传感器。利用COMSOL软件进行了有限元仿真分析,通过比较两种传感器结构的穿透深度、灵敏度与信号强度,优选出了圆柱式结构。再通过正交实验对不同参数组合的圆柱式传感器进行性能比较，确定了传感器的最优参数组合为电极间距5 mm、电极宽度50 mm、电极半径15 mm,使所研制传感器的穿透深度可达66.86 mm、信号强度为11.387 pF、灵敏度为0.267。最后,利用所研制传感器对不同含水率的水泥混凝土进行了实际测量,传感器输出电容值与含水率有良好的线性关系,非线性误差为±1.276%,并与称重法相比最大相对误差为1.533%,具有良好的测量效果。 |
| 英文摘要: |
| Cement concrete is a composite material employed in a multitude of engineering construction projects. The setting state of cement concrete exerts a profound influence on the advancement and security of such endeavours. It has been demonstrated that the setting time of cement concrete is contingent upon the water content. Therefore, a water content sensor based on the principle of capacitance detection is designed to measure the water content of cement concrete. According to the dielectric properties of cement concrete and the detection principle of capacitive sensors, and utilising the edge electric field to extend the measuring range, capacitive edge electric field sensors of parallel plate and cylindrical types were designed. A finite element simulation analysis was conducted using COMSOL software, and the cylindrical structure was selected based on a comparison of the penetration depth, sensitivity and signal strength of the two sensor structures. Subsequently, the performance of the cylindrical sensors with different parameter combinations was compared by orthogonal experiments, and the optimal parameter combinations of the sensors were determined as electrode spacing of 5 mm, electrode width of 50 mm, and electrode radius of 15 mm. This configuration enabled the sensors to reach a depth of penetration of 66.86 mm, a signal strength of 11.387 pF, and a sensitivity of 0.267. Finally, the developed sensor was utilised for the actual measurement of cement concrete with varying water contents, and the output capacitance value exhibited a satisfactory linear relationship with the water content, with a non-linear error of ±1.276% and a maximum relative error of 1.533% in comparison with that of the weighing method, which demonstrated a satisfactory measurement effect. |
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