Magnetic field estimation in measurement dead domain for dry calibration of electromagnetic flowmeter
Magnetic field estimation in measurement dead domain for dry calibration of electromagnetic flowmeter
复制标题
电磁流量计干标定测量死区磁场估计
DOI：
10.1088/0957-0233/23/8/085303
复制
发表时间：
2012-08
影响因子：
2.4
通讯作者：
Xin Fu
中科院分区：
文献类型：
--
作者：
Liang Hu;Hui-Min Shen;Kok-Meng Lee;Xin Fu
计算技术的进步使大直径电磁（EM）流量计的干式校准成本低，这已被公认为是一种有效的替代传统的流量钻机。干式校准不需要测量管道中的实际液体，利用从测量的边界条件重构的磁场分布来确定EM流量计的灵敏度。然而，由于传感器具有有限的尺寸，并且测量管道的内衬由于机械应力而变形，因此在测量的边界表面和管道壁之间存在测量死区（MDD）。由于MDD通常靠近磁激励单元，忽略它会导致干校准中的重大误差。本文提出了一种结合迭代优化和重构的实用方法，从测量边界表面上的磁场数据估计MDD中的磁场。通过比较MDD中的估计场与实验测量值，在现成的工业EM流量计上验证了该方法。已经证明，准确地解释MDD中不可测量的字段可以消除三分之二以上的干校准误差。这里所示的估计方法也可以扩展到测量服从类似控制方程的其他物理场。
Advances in computing technology enable dry calibration of large-diameter electromagnetic (EM) flowmeters at low cost, which has been recognized as an effective alternative to traditional flow rigs. Dry calibration requiring no actual liquid in the measuring pipe utilizes the magnetic field distribution reconstructed from measured boundary conditions to determine the sensitivity of the EM flowmeter. However, because sensors have finite sizes, and the fact that inner linings of the measuring pipe deform due to mechanical stresses, a measurement dead domain (MDD) exists between the measured boundary surface and the pipe wall. As the MDD is often close to the magnetic exciting unit, neglecting it results in significant errors in dry calibration. This paper offers a practical method combining iterative optimization and reconstruction to estimate the magnetic field in the MDD from the field data on the measured boundary surface. The method has been validated on an off-the-shelf industrial EM flowmeter by comparing the estimated field in the MDD with experimental measurements. It has been demonstrated that accurately accounting for the immeasurable field in the MDD eliminates more than two-thirds of the dry calibration errors. The estimation method illustrated here can also be extended to measure other physical fields which obey similar governing equations.
登录
查看更多内容
DOI：
--
发表时间：
2001
期刊：
--
影响因子：
--
作者：
Sylvain Baillet;J. Mosher;R. Leahy
通讯作者：
Sylvain Baillet;J. Mosher;R. Leahy
影响因子：
6.6
作者：
V. Ferraro;D. S. Jones
通讯作者：
V. Ferraro;D. S. Jones
影响因子：
3.1
作者：
Gill, PE;Murray, W;Saunders, MA
通讯作者：
Saunders, MA
DOI：
10.1049/ep.1964.0207
发表时间：
1964-06
期刊：
Electronics and Power
影响因子：
--
作者：
A. Beck
通讯作者：
A. Beck
影响因子：
3.2
作者：
Xin Fu;Li Hu;K. Lee;J. Zou;X. Ruan;Huayong Yang
通讯作者：
Xin Fu;Li Hu;K. Lee;J. Zou;X. Ruan;Huayong Yang