A displacement sensing method based on alternating current magnetic flux measurement
A displacement sensing method based on alternating current magnetic flux measurement
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DOI：
10.1088/1361-6501/aace30
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发表时间：
2018-08-01
影响因子：
2.4
通讯作者：
Kang, Yihua
中科院分区：
文献类型：
--
作者：
Zhang, Jikai;Wang, Rongbiao;Kang, Yihua
位移传感器在许多应用中起着至关重要的作用。提出了一种基于交流磁通测量的新型位移传感方法，旨在研制一种实用的铁磁材料位移传感器。该方法根据磁通量与位移倒数之间的线性关系，通过检测磁路中的磁通量来测量位移。采用等效磁路法和有限元法对一种桥式结构传感器进行了分析。两者都表明传感器的输出与位移的倒数成线性关系。一系列的实验验证了该方法的可行性。我们的原型传感器的测量结果显示，在大于3 mm的测量范围内的相关系数R-2超过0.995的线性关系。此外，结果显着表明，测量结果不受铁磁材料的变化，最坏情况下的误差小于5%。
Displacement sensors play an essential role in many applications. Based on an alternating current magnetic flux measurement, a novel displacement sensing method aimed at developing a practical displacement sensor for ferromagnetic materials is proposed. In this method, the displacement is measured by detecting the magnetic flux in a magnetic circuit, according to a linear relation between the magnetic flux and the reciprocal of displacement. An equivalent magnetic circuit and finite element method are used in analyzing a bridge-structured sensor designed in this paper. Both show that the output of the sensor is linear with the reciprocal of the displacement. A series of experiments have verified the feasibility of the proposed method. The measured results of our prototype sensor show a linear relation with the correlation coefficient R-2 over 0.995 in a measurement range larger than 3 mm. Furthermore, the results significantly indicate that the measured results are not influenced much by the change of ferromagnetic materials with the worst-case error less than 5%.