Modelling of an inductive sensor of the Foucault cardiogram
Modelling of an inductive sensor of the Foucault cardiogram
复制标题
傅科心电图感应传感器的建模
DOI：
10.3176/eng.2011.3.0
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Jaanus Trolla
中科院分区：
文献类型：
--
作者：
J. Vedru;R. Gordon;L. Humal;Jaanus Trolla
建立了描述电感式心脏机械活动传感器工作状态的电路模型。该传感器包括一个单圈感应线圈，该线圈被认为连接在心脏前面的男性胸腔表面。线圈由7.7 MHz恒流供电，在体内感应探头涡流。建立了一个简单的胸部的轴对称计算机模型，由紧密排列的环形电流管组成，以表示线圈-患者系统。对于身体组织的复值阻抗，该模型已被用于计算系统内的阻抗和电感。为了进行比较，建立了相同系统的精细有限元模型并进行了测试。两种不同计算方法的可比结果显示出足够的一致性。给出了系统参数的估计值，并对信号产生进行了分析。使用电感以傅科或涡流的形式施加探测电流。相同的电感可以用作信号接收器，从而形成用于感应测量的传感器。为了改进感应方法，有必要对这类传感器的模型进行辨识。本研究基于福柯心动图传感器的一个具体例子，该传感器被应用于跟踪心脏机械活动(2，3)。本工作的目的是开发一种现实但简单的传感器的计算机模型，该传感器装载有患者并使用
An electric circuit model, describing the inductive sensor of cardiac mechanical activity in its working condition, has been developed. The sensor includes a single-turn inductor coil, which is considered to be attached to the thoracic surface of a man, in front of the heart. The coil is fed by 7.7 MHz constant current and induces probing eddy currents in the body. A simple axisymmetric computer model of the thorax, formed of tightly packed circular current tubes, was created to represent the coil-patient system. With complex-valued impedivities for the body tissues, the model has been used to calculate the impedances and inductances within the system. For comparison, a fine FEM model of the same system was created and tested. Comparable results of the two different calculation methods exhibited sufficient consistence. The estimates of the parameters of the system were found and the signal production was analysed. the probing currents are applied in the form of Foucault or eddy currents, using inductors. The same inductors can be used as signal receivers, thus forming sensors for inductive measurement. To improve the induction methods, identified models of such sensors are necessary. The present study is based on a concrete example of the Foucault cardiographic sensor, which is applied to track heart mechanical activity ( 2,3 ). The objective of the present work was to develop a realistic but simple computer model of the sensor loaded with a patient and, using