| 邱锦川,刘昭廷,罗 伟,段蕴琦,伍剑波,向天乐.基于正交试验法的电磁超声换能器梯形硅钢聚磁器优化设计[J].电子测量与仪器学报,2023,37(12):98-106 |
| 基于正交试验法的电磁超声换能器梯形硅钢聚磁器优化设计 |
| Design of trapezoidal magnetic concentrator for electromagnetic ultrasonic transducer based on orthogonal test method |
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| DOI： |
| 中文关键词: 梯形硅钢聚磁器 正交试验 仿真优化 电磁超声测厚 |
| 英文关键词:trapezoidal silicon steel magnetic concentrator orthogonal experiment simulation optimization electromagnetic ultrasonic
thickness measurement |
| 基金项目:国家自然科学基金 (62373265) 、四川省科技计划项目(2023YFQ0060,2022YFG0044)资助 |
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| 中文摘要: |
| 针对电磁超声换能器(EMAT)换能效率低、信噪比低和磁体内部超声波影响信号识别的问题,传统的处理方法包括添
加铜箔背板或聚磁器。 然而,铜箔背板在消除磁铁自振荡的同时减小了信号幅值;而已有的聚磁器又存在结构复杂,加工困难,
成本较高等问题。 文章提出了一种在永磁体与线圈之间添加梯形硅钢聚磁器的新型 EMAT 结构。 梯形硅钢聚磁器结构简单,
利用胶粘工艺制作。 梯形聚磁器通过增加磁铁与线圈的距离来消除磁铁中的超声波,同时通过独特的梯形结构将磁铁的磁感
线聚集于线圈作用区域,提高回波信号幅值。 由于梯形硅钢聚磁器的尺寸对回波信号幅值有明显的影响,为了获取梯形硅钢聚
磁器的最优尺寸,在 COMSOL 仿真平台中采用正交试验法对硅钢聚磁器的几何尺寸进行了优化设计。 仿真和实验结果分别表
明,含优化后梯形聚磁器 EMAT 的信号幅值较无背板 EMAT 提高约 60%,含优化后梯形聚磁器 EMAT 的信号幅值约为含
0. 1 mm 铜箔背板 EMAT 的 6 倍。 |
| 英文摘要: |
| To address the challenges of low transduction efficiency, poor signal-to-noise ratio, and the influence of internal ultrasonic
waves within magnets on signal detection in electromagnetic acoustic transducers (EMAT), conventional methods have employed copper
foil backings or magnetic flux concentrators. However, while copper foil backings alleviate magnet resonance, they also reduce signal
amplitude. On the other hand, existing flux concentrators suffer from complex structures, manufacturing difficulties, and high costs.
This paper presents a novel EMAT design that incorporates a trapezoidal silicon steel concentrator positioned between the permanent
magnet and the coil. The trapezoidal concentrator, with its simple structure fabricated using adhesive bonding techniques, effectively
eliminates ultrasonic waves within the magnet by increasing the distance between the magnet and the coil. Moreover, its unique
trapezoidal shape concentrates the magnetic flux lines into the coil’s active region, thereby enhancing the amplitude of the echo signal.
The optimal dimensions of the trapezoidal silicon steel concentrator, which significantly impact the echo signal’ s amplitude, were
determined through orthogonal experimental design on the COMSOL simulation platform. The simulation and experimental results
demonstrate that the signal amplitude of the EMAT with the optimized trapezoidal concentrator is approximately 60% higher compared to
the EMAT without a backplate. Furthermore, the signal amplitude of the EMAT with the optimized trapezoidal concentrator is
approximately six times greater than that of the EMAT with a 0. 1 mm copper foil backplate. |
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