用于相含率测量的螺旋电磁传感器优化设计

通过激励线圈和检测线圈,电磁传感器可以对被测物内部的电磁特性进行测量.为此,提出了一种用于相含率测量的新型电磁传感器——螺旋电磁传感器,进一步采用场量提取法推算了180°和360°螺旋线圈的灵敏度矩阵,并基于灵敏度分析对这2种传感器结构进行了优化设计,得到了优化参数的选取范围和规律.改进的螺旋电磁传感器具有更均匀、更灵敏的特性.同时,硬件实验表明,螺旋电磁传感器检测的电学敏感指标能够很好地反映被测物场的相含率,通过传感器的互感相角相对变化率与相含率的相关曲线,可以验证螺旋电磁传感器在相含率测量中的可行性和准确性.

Optimal Design of Spiral Electromagnetic Sensor for Phase Holdup Measurement

Electromagnetic sensors can obtain the distributions of the medium through excitation and sensing coils distributed on the boundary. In this paper,a novel spiral electromagnetic sensor was proposed for phase holdup measurement. The sensitivity matrices of the spiral sensors of 180 and 360 degrees rotation were derived based on field theory and the design was optimized based on sensitivity analysis. The trends and rules for selecting the optimum parameters were obtained. The optimized spiral electromagnetic sensors have better and more homogenous sensitivity distributions. The experiment showed that the electric signals obtained were good indicators of the phase holdup. The correlation curves between phase holdup and the relative change ratio of the phase angle of spiral sensors were ob-tained which proved the feasibility and accuracy of the phase holdup measurement by the spiral electromagnetic sen-sors.