CAJ | 학술논문

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。
자치신축식도파검측전감기（MsS）작위일충신형적초성파검측장치가응용우관도적건강감측，단기교저적능량전환효솔각한제료기진일보적응용。위제고MsS능량전환효솔，종편치자장균균성각도출발，분석료편치자장균균성대전감기수출특성적영향。채용유한원방법분석자화장치개수여방치방식대관도내부자장분포상황적영향，분석표명，괄당증가자화장치개수가이유효제고편치자장적균균성；동시재자장장치개수일정시，균포적방치방식장유조우형성균균적편치자장。이유한원계산결론위기출，이론추도료편치자장여검측효솔적관계，병통과실험연구게시료자장분포불균균성대MsS수출적영향。통과개선편치자장적균균성가이유효지제고자치신축도파전감기적검측효솔。
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 theSNR of MsS,the effect of homogeneous bias magnetic field on output characteristics of the sensor is analyzed based on homogeneityof the field.Moreover,impacts of the number and placement of magnetization devices on the magnetic field distribution in pipelinesare analyzed using Finite Element Method (FEM).The analysis results show that properly increasing the number of magnetizationdevices can help effectively improve the homogeneity of bias magnetic field;when a certain number of magnetization devices arefixed,uniform placement of the devices is favorable for generating a homogeneous magnetic field.Based on FEManalysis results,theoretical derivation of relationship between the bias magnetic field and detection efficiency is also presented.Meanwhile,the effectof inhomogeneity of magnetic field on the output of MsS is investigated and discovered through experiments.The research results in-dicate that the SNR of MsS can be effectively improved by enhancing the homogeneity of bias magnetic field.