摘要
磁致伸缩式导波检测传感器(MsS)作为一种新型的超声波检测装置可应用于管道的健康监测,但其较低的能量转换效率却限制了其进一步的应用。为提高MsS能量转换效率,从偏置磁场均匀性角度出发,分析了偏置磁场均匀性对传感器输出特性的影响。采用有限元方法分析磁化装置个数与放置方式对管道内部磁场分布状况的影响,分析表明,适当增加磁化装置个数可以有效提高偏置磁场的均匀性;同时在磁场装置个数一定时,均布的放置方式将有助于形成均匀的偏置磁场。以有限元计算结论为基础,理论推导了偏置磁场与检测效率的关系,并通过实验研究揭示了磁场分布不均匀性对MsS输出的影响。通过改善偏置磁场的均匀性可以有效地提高磁致伸缩导波传感器的检测效率。
Magnetostrictive waveguide sensor （MsS） is a new generation of ultrasonic detector applied in structural health monitoring （SHM） of pipelines. However, its further application is restricted by a lower signal to noise ratio （SNR）. In order to improve the SNR of MsS, the effect of homogeneous bias magnetic field on output characteristics of the sensor is analyzed based on homogeneity of the field. Moreover, impacts of the number and placement of magnetization devices on the magnetic field distribution in pipelines are analyzed using Finite Element Method （FEM）. The analysis results show that properly increasing the number of magnetization devices can help effectively improve the homogeneity of bias magnetic field; when a certain number of magnetization devices are fixed, uniform placement of the devices is favorable for generating a homogeneous magnetic field. Based on FEM analysis results, theoretical derivation of relationship between the bias magnetic field and detection efficiency is also presented. Meanwhile, the effect of inhomogeneity of magnetic field on the output of MsS is investigated and discovered through experiments. The research results indicate that the SNR of MsS can be effectively improved by enhancing the homogeneity of bias magnetic field.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2014年第2期390-394,共5页
Acta Petrolei Sinica
基金
国家自然科学基金项目(No.50875077
No.52160124)
湖北省高等学校优秀中青年科技创新团队计划项目(T201105)
教育部科学技术重点研究项目(211110)资助
关键词
磁场均匀性
磁致伸缩
传感器
偏置磁场
导波
magnetic field homogeneity
magnetostriction
sensor
bias magnetic
guided wave
